Test tubular column and test method for fine layering of coiled tubing

Abstract

The invention relates to a test tubular column and a test method for fine layering of a continuous tube. In the testing tubular column, a first temperature and pressure testing device, a second temperature and pressure testing device and a third temperature and pressure testing device are respectively used for detecting the temperature and the pressure of corresponding positions; the upper packer and the lower packer are used for setting under the action of pressurizing of the coiled tubing and keeping of first pressure; the upper packer is further used for being communicated with the oil sleeve annulus under the action of continuous pipe pressing and keeping second pressure. The upper packer and the lower packer are used for being lifted and unsealed through the coiled tubing in the setting state, and after lifting and unsealing, the upper packer can cut off communication with an oil sleeve annulus. The closable check valve is used for being communicated with an oil jacket annulus in the process that the test pipe column is tripped into a shaft so as to introduce liquid in the oil jacket annulus into the continuous pipe, and is used for cutting off communication with the oil jacket annulus under the action of the continuous pipe pressing and first pressure keeping; wherein the first pressure is smaller than the second pressure.

Description

Technical Field

[0001] This invention relates to a test string and test method for fine stratification of continuous tubes. Background Technology

[0002] With the deepening of oil and gas field exploration and development in my country, layered fracturing technology is often used to transform reservoirs with strong heterogeneity. After fracturing, the oil and water production, formation pressure, temperature and other data of each section are obtained through horizontal well fine layered testing technology. This provides data support for the improvement and perfection of fracturing technology, construction parameters, fluid system, evaluation of engineering sweet spots and adjustment of production system, as well as the formulation of subsequent exploration and development plans. It is of great significance for improving the accuracy of unconventional oil and gas exploration and development. Taking the exploration and development of shale oil in a certain oil field as an example, the production of the shale oil wells that have been developed is uneven. There are few high-yield wells and more low-yield wells and ineffective wells. It is urgent to understand the reasons through fine layered testing, such as (1) what the oil, water production and pressure data of each section are like (2) whether the contribution of each section is consistent with the geological interpretation and the scale of transformation (3) whether the degree of transformation is consistent with the production situation (4) whether adding pre-coated CO2 is useful for energy enhancement. Summary of the Invention

[0003] To achieve precise downhole stratification testing and directly obtain accurate reservoir production data, this invention proposes a test string and method for fine stratification testing using coiled tubing. The technical solution proposed in this invention is as follows:

[0004] In a first aspect, the present invention provides a test string for finely layered continuous tubes, comprising: a continuous tube, a first temperature and pressure testing device, an upper packer, a second temperature and pressure testing device, a lower packer, a closable check valve, and a third temperature and pressure testing device connected sequentially from top to bottom;

[0005] The first temperature and pressure testing device, the second temperature and pressure testing device, and the third temperature and pressure testing device are respectively used to detect the temperature and pressure at the corresponding locations;

[0006] The upper and lower packers are used for setting the coil under pressure and maintaining a first pressure; the upper packer is also used for communicating with the annulus of the oil sleeve under pressure and maintaining a second pressure.

[0007] The upper packer and the lower packer are used to be able to be lifted and unsealed through the continuous tube in the set state, and after being lifted and unsealed, the upper packer can cut off the communication with the annulus.

[0008] The closable single-flow valve is used to communicate with the annulus during the process of running the test tubing into the wellbore, so as to allow the fluid in the annulus to flow into the coiled tubing, and is also used to cut off the communication with the annulus under the action of pressurizing the coiled tubing and maintaining the first pressure; wherein the first pressure is less than the second pressure.

[0009] Secondly, the present invention provides a method for testing fine stratification of a continuous tube, comprising:

[0010] The test string with finely layered continuous tubing is lowered into the test layer. During the lowering process, a closed-loop valve is connected to the annulus to allow the liquid in the annulus to be introduced into the continuous tubing.

[0011] By pressurizing the continuous pipe from the ground and maintaining the first pressure, the closed-loop valve cuts off the connection between the pipe and the annulus, sets the upper and lower packers, and continues to pressurize and maintain the second pressure to make the upper packer connected to the annulus.

[0012] The temperature and pressure at corresponding locations are detected by the first temperature and pressure testing device, the second temperature and pressure testing device and the third temperature and pressure testing device, respectively, to carry out the testing process;

[0013] After the test is completed, the continuous tube is lifted to release the upper packer and the lower packer, and after lifting and releasing, the upper packer disconnects from the annulus; the first pressure is less than the second pressure;

[0014] Repeat the above testing process until all test layers have been tested, then remove the test string.

[0015] Based on the above technical solution, the beneficial effects of the present invention compared with the prior art are as follows:

[0016] The coiled tubing test string provided in this invention utilizes the technical advantage of coiled tubing's ability to operate under pressure. In flowing wells, intermittently flowing wells, or conventional and unconventional oil and gas wells after induced flow, the test string is inserted without well control. Pressure is applied using a closable single-flow valve, and the upper and lower packers are hydraulically set to achieve a "double-seal single-clamp" test operation. This divides the wellbore into three independent spaces, allowing the use of corresponding temperature and pressure testing devices to acquire opening flow pressure, shut-in pressure, pressure recovery data, and corresponding temperature values. Using the coiled tubing as a production channel, production data for each layer can be directly obtained from the surface. A single test can obtain three different temperature and pressure values ​​of varying locations and properties, thus accurately evaluating the fracturing effect on the reservoir.

[0017] In this embodiment of the invention, the upper and lower packers can achieve pressure setting and unsealing inside the coiled tubing, with stable operation. Through repeated setting and unsealing, drag testing is achieved. It is suitable for testing operations in multiple reservoirs in unconventional oil and gas wells such as shale oil and gas and tight oil and gas, including vertical wells, highly deviated wells, and horizontal wells. It improves the success rate of multi-layer, fine-grained stratified testing operations, and by accurately acquiring test data, evaluates and analyzes the effect of reservoir fracturing, providing data support for the formulation of fracturing processes and construction plans.

[0018] In this embodiment of the invention, the closable single-flow valve is connected to the annulus during the process of running the test tubing into the wellbore, so as to pass the liquid in the annulus into the coiled tubing to balance the tubing pressure and prevent the coiled tubing from being crushed.

[0019] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the structure of a continuous tube fine-layer test column provided in an embodiment of the present invention. Figure 1 ;

[0023] Figure 2 A schematic diagram of the structure of a continuous tube fine-layer test column provided in an embodiment of the present invention. Figure 2 ;

[0024] Figure 3A This is a cross-sectional view of the first temperature and pressure testing device provided in an embodiment of the present invention;

[0025] Figure 3B This is a top view of the first temperature and pressure testing device provided in an embodiment of the present invention;

[0026] Figure 3C for Figure 3A AA view of the first thermobaric testing device shown;

[0027] Figure 4A This is a cross-sectional view of the second temperature and pressure testing device provided in an embodiment of the present invention;

[0028] Figure 4B This is a top view of the second temperature and pressure testing device provided in an embodiment of the present invention;

[0029] Figure 4C for Figure 4A The second thermobaric testing device is shown in the BB view.

[0030] Figure 5A This is a cross-sectional view of the third temperature and pressure testing device provided in an embodiment of the present invention;

[0031] Figure 5B This is a top view of the third temperature and pressure testing device provided in an embodiment of the present invention;

[0032] Figure 5C for Figure 5A The third thermobaric testing device is shown in a CC view.

[0033] Figure 6 A cross-sectional view of the upper packer provided for an embodiment of the present invention;

[0034] Figure 7 A cross-sectional view of the rubber sleeve sealing mechanism of the upper packer provided in an embodiment of the present invention;

[0035] Figure 8 A full sectional view (slide valve closed state) of the test slide valve mechanism of the upper packer provided in an embodiment of the present invention;

[0036] Figure 9 This is a full sectional view (slide valve open state) of the test slide valve mechanism of the upper packer provided in an embodiment of the present invention;

[0037] Figure 10 This is a cross-sectional view of the lower packer in the unsealed state provided in an embodiment of the present invention;

[0038] Figure 11 This is a cross-sectional view of the lower packer in the setting state provided in an embodiment of the present invention;

[0039] Figure 12 A cross-sectional view of the spring stabilizer, the closable check valve, and the venting bypass valve connected according to an embodiment of the present invention;

[0040] Figure 13 This is a cross-sectional view of the spring stabilizer, the closable check valve, and the venting bypass valve connected in the closed state of the flow orifice, as provided in an embodiment of the present invention.

[0041] Figure 14This is a cross-sectional view of the spring stabilizer, the closable check valve, and the bleed bypass valve connected after the check valve and the blind blockage have been removed, as provided in an embodiment of the present invention.

[0042] In the diagram: 1. Continuous tube; 2. Connector; 3. Safety joint; 4. First temperature and pressure testing device; 4-1. First support inner core; 4-2. First support body; 4-3. First thermometer and barometer; 4-4. First annular channel; 4-5. First connecting hole; 5. Upper packer; 5-1. Central tube; 5-1-1. Rubber tube pressure transmission hole; 5-1-2. Slide valve pressure transmission hole; 5-2. First upper connector; 5-3. First upper connector connecting sleeve; 5-4. First rubber tube gasket; 5-5. First rubber tube support; 5-6. First rubber tube assembly; 5-7. First upper cone; 5-8. First support sleeve; 5-9. First fixing plug; 5-10. Fixing sleeve; 5-10-1. Test hole; 5-11. Support piston; 5-12. First unlocking device. Piston; 5-13, First piston support sleeve; 5-14, Slide valve; 5-14-1, Connecting shaft; 5-14-2, Slide valve piston; 5-14-3, Test communication hole; 5-15, First locking block; 5-16, First lower connector; 5-17, First limiting sleeve; 5-18, First annular space; 6, Second temperature and pressure testing device; 6-1, Second support inner core; 6-2, Second support body; 6-3, Second annular channel; 6-4, Second thermometer and barometer; 6-5, Second communication hole; 7, Lower packer; 7-1, Second mandrel; 7-1-1, Sealing pressure transmission hole; 7-1-2, Sealing pressure transmission hole; 7-2, Second upper connector; 7-3, Second upper connector connecting sleeve; 7-4, Second rubber sleeve gasket; 7-5, Second rubber... 7-6. Cylinder support; 7-7. Second rubber cylinder assembly; 7-8. Second upper cone; 7-9. Second support sleeve; 7-10. Slip; 7-11. Slip seat; 7-12. Upper seat piston; 7-13. Seat piston; 7-14. Seat support sleeve; 7-15. Sliding sleeve; 7-16. Second unlocking piston; 7-17. Second locking block; 7-18. Second piston support sleeve; 7-19. Limiting sleeve; 7-20. Lower connector; 7-21. Second annular space; 8. Spring stabilizer; 8-1. Central shaft; 8-1-1. Upper pressure hole; 8-1-2. Lower pressure hole; 8-2. Upper limit ring; 8-3. Upper sliding sleeve; 8-4. Upper limit sleeve; 8-5. Stabilizing block; 8-6. Support spring; 8 -7. Lower limit sleeve; 8-8. Lower sliding sleeve; 8-9. Lower limit ring; 8-10. Limiting snap ring; 9. Closable single-flow valve; 9-1. Valve body; 9-1-1. Flow hole; 9-2. Ball seat; 9-2-1. Ball seat shear pin; 9-2-2. Blocking ball; 9-2-3. Ball blocking pin; 9-3. Rubber ring sleeve; 10. Relief bypass valve; 10-1. Upper valve body; 10-2. Lower valve body; 10-3. Relief blind plug; 10-4. Relief shear pin; 10-5. Bypass hole; 11. Third temperature and pressure testing device; 11-1. Inner core of the first support cylinder; 11-2. First support cylinder body; 11-3. First temperature and pressure gauge; 11-4. First annular channel; 11-5. First connecting hole; 12. Coupling positioner; 13. Tail pipe. Detailed Implementation

[0043] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0044] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0045] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Current technologies can only obtain general well production data. Furthermore, the production profiles obtained from logging instruments are derived from later calculations and inversions, resulting in low reliability. Currently, methods for directly acquiring dynamic production data are lacking, and refined testing and evaluation are practically impossible. Therefore, there is an urgent need for refined stratified testing to directly obtain dynamic production parameters for each layer within the well, thereby accurately evaluating the effects of fracturing on shale oil reservoirs. To this end, the inventors have developed this invention through further research.

[0048] This invention provides a test string for fine stratification of continuous tubes, referring to... Figure 1 and Figure 2 As shown, the test string includes: a continuous tube 1, a first temperature and pressure test device 4, an upper packer 5, a second temperature and pressure test device 6, a lower packer 7, a closable check valve 9, and a third temperature and pressure test device 11, connected sequentially from top to bottom.

[0049] The first temperature and pressure testing device 4, the second temperature and pressure testing device 6, and the third temperature and pressure testing device 11 are respectively used to detect the temperature and pressure at the corresponding locations;

[0050] The upper packer 5 and the lower packer 7 are used to set the seal under the action of pressurizing and maintaining the first pressure on the continuous tube 1; the upper packer 5 is also used to communicate with the annulus of the oil sleeve under the action of pressurizing and maintaining the second pressure on the continuous tube 1.

[0051] The upper packer 5 and the lower packer 7 are used to be able to be lifted and unsealed through the continuous tube 1 in the set-sealing state, and after being lifted and unsealed, the upper packer 5 can cut off the communication between the oil jacket annulus;

[0052] The closable single-flow valve 9 is used to communicate with the annulus during the process of the test tubing being lowered into the wellbore, so as to allow the liquid in the annulus to be introduced into the continuous tubing 1, and to cut off the communication with the annulus under the action of pressurizing the continuous tubing 1 and maintaining the first pressure; wherein the first pressure is less than the second pressure.

[0053] The coiled tubing test string provided in this invention utilizes the technical advantage of coiled tubing's ability to operate under pressure. In flowing wells, intermittently flowing wells, or conventional and unconventional oil and gas wells after induced flow, the test string is inserted without well control. Pressure is applied using a closable single-flow valve, and the upper and lower packers are hydraulically set to achieve a "double-seal single-clamp" test operation. This divides the wellbore into three independent spaces, allowing the use of corresponding temperature and pressure testing devices to acquire opening flow pressure, shut-in pressure, pressure recovery data, and corresponding temperature values. Using the coiled tubing as a production channel, production data for each layer can be directly obtained from the surface. A single test can obtain three different temperature and pressure values ​​of varying locations and properties, thus accurately evaluating the fracturing effect on the reservoir.

[0054] In this embodiment of the invention, the upper and lower packers can achieve pressure setting and unsealing inside the coiled tubing, with stable operation. Through repeated setting and unsealing, drag testing is achieved. It is suitable for testing operations in multiple reservoirs in unconventional oil and gas wells such as shale oil and gas and tight oil and gas, including vertical wells, highly deviated wells, and horizontal wells. It improves the success rate of multi-layer, fine-grained stratified testing operations, and by accurately acquiring test data, evaluates and analyzes the effect of reservoir fracturing, providing data support for the formulation of fracturing processes and construction plans.

[0055] In this embodiment of the invention, the closable single-flow valve is connected to the annulus during the process of running the test tubing into the wellbore, so as to pass the liquid in the annulus into the coiled tubing to balance the tubing pressure and prevent the coiled tubing from being crushed.

[0056] In one specific embodiment, reference is made to Figure 1 and Figure 2 As shown, the test tubing also includes a venting bypass valve 10;

[0057] The venting bypass valve 10 is connected between the closable single-flow valve 9 and the third temperature and pressure testing device 11;

[0058] The venting bypass valve 10 is used to block the test string and connects to the annulus when the continuous tube 1 is pressurized to the fourth pressure.

[0059] In one specific embodiment, reference is made to Figure 1 and Figure 2 As shown, the test string for finely layered continuous tubing also includes connector 2, safety joint 3, coupling locator 12, and tailpipe 13. The continuous tubing 1, connector 2, safety joint 3, first temperature and pressure testing device 4, upper packer 5, second temperature and pressure testing device 6, lower packer 7, closable check valve 9, venting bypass valve 10, third temperature and pressure testing device 11, coupling locator 12, and tailpipe 13 are connected sequentially from top to bottom along the wellbore.

[0060] The specific implementation of the connector 2, safety joint 3, coupling locator 12, and tailpipe 13 can be found in the detailed description of existing technology. Connector 2 can be an internal or external connector such as a rivet connector or roll-fit connector, used to connect the continuous tubing 1 to the tool below it, forming a tool string. Safety joint 3 is used to disengage the entire test string at the safety joint when the packer or other tools are stuck in the wellbore, by dropping a ball and applying pressure, allowing the upper tool and continuous tubing to be retrieved, while the lower tool remains in the well for subsequent retrieval operations. Coupling locator 12 is used to position the test string within the wellbore. Tailpipe 13 is a short tubing section that marks the end of the entire test string.

[0061] It should be noted that the test string positioning method provided in this embodiment of the invention has two aspects, allowing for selective decision on whether to connect the coupling locator 12 to the test string. One method is mechanical positioning, suitable for situations where there is a short casing on the cementing casing inside the wellbore and the position of the short casing within the wellbore is known. In this method, the coupling locator 12 is connected to the test string, and the test string is pulled upwards at a point below the short casing position via the continuous tubing 1. During this process, the retaining ring block on the coupling locator 12 will generate tension fluctuations at the casing coupling. At the short casing, the distance from one tension fluctuation point to the next fluctuation point is less than the distance of the tension fluctuation point for a normal casing, thus determining the position of the short casing. Based on this, the position of the test string within the wellbore can be determined, thereby achieving mechanical positioning. The other method is bottom-of-well positioning, suitable for situations where there is no short casing in the wellbore or the position of the short casing is uncertain. The test string can be without the coupling positioner 12. The test string is slowly pushed down to the bottom of the well through the continuous tube 1 to explore the bottom depth. If resistance is encountered, the pressure is increased but not exceeding the preset pressure, such as 30kN. The depth is then calibrated on the surface using a continuous tube counter and the known bottom depth. The bottom depth is explored repeatedly more than 3 times to obtain the accurate position of the test string, thereby achieving bottom positioning.

[0062] In an optional embodiment, refer to Figures 3A to 3C As shown, the first temperature and pressure testing device 4 includes: a first support body 4-2, a first support inner core 4-1, and a first temperature and pressure gauge 4-3; wherein:

[0063] The first inner core 4-1 of the first support tube is disposed on the inner wall of the first support tube body 4-2, and the first thermo-barometer 4-3 is disposed in the first inner core 4-1 of the first support tube; a first annular channel 4-4 for flow passage is formed in the first support tube body 4-2; a first connecting hole 4-5 is provided on the first support tube body 4-2, and the first connecting hole 4-5 connects to the first inner core 4-1 of the first support tube.

[0064] In this embodiment of the invention, the inner core 4-1 of the first support cylinder of the first temperature and pressure testing device 4 is connected to a portion of the inner wall of the first support cylinder body 4-2, with the remainder forming a first annular channel 4-4. The inner core 4-1 has a cylindrical interior space for housing a first thermometer / barometer 4-3. The portion connecting the inner core 4-1 to the first support cylinder body 4-2 is drilled with the aforementioned first connecting hole 4-5 for internal and external communication. This allows liquid outside the first temperature and pressure testing device 4 to enter the inner core 4-1 through the first connecting hole 4-5, thereby enabling the first thermometer / barometer 4-3 to monitor the liquid's temperature and pressure. The first temperature and pressure testing device 4 is connected to a test column, allowing liquid outside the first support cylinder body 4-2 to enter the inner core 4-1 and allowing liquid inside the test column to flow through the first annular channel 4-4, thus forming a production channel. However, the liquids from both sides do not come into contact with each other, thus not affecting the monitoring results.

[0065] In one specific embodiment, reference is made to Figures 3A to 3C As shown, the first temperature and pressure testing device 4 may also include male buckles arranged symmetrically at the top and bottom, wherein the upper male buckle is connected to the safety connector 3 and the lower male buckle is connected to the upper packer 5.

[0066] In one specific embodiment, one or more tubing stubs may be connected between the first temperature and pressure testing device 4 and the safety connector 3, and between the first temperature and pressure testing device 4 and the upper packer 5, as needed, to extend the test string.

[0067] In an alternative embodiment, refer to 4A to Figure 4C As shown, the second temperature and pressure testing device includes: a second support body 6-2, a second support inner core 6-1, and a second temperature and pressure gauge 6-4; wherein:

[0068] The second inner core 6-1 of the support tube is connected to the second body 6-2 of the support tube by a support rod (not shown in the figure), and the second thermo-barometer 6-4 is disposed in the second inner core 6-1 of the support tube; a second annular channel 6-3 for flow passage is formed between the second body 6-2 of the support tube and the second inner core 6-1 of the support tube; a second connecting hole 6-5 is provided on the second inner core 6-1 of the support tube, and the second connecting hole 6-5 connects to the second annular channel.

[0069] In this embodiment of the invention, the inner core 6-1 of the second support cylinder of the second temperature and pressure testing device 6 is connected to the interior of the second support cylinder body 6-2 via three supporting rods. The non-connected portion between the inner core 6-1 and the second support cylinder body 6-2 is the second annular channel 6-3. A second connecting hole 6-5 is formed on the inner core 6-1 by slits or drilling, communicating with the second annular channel 6-3. The cylindrical space inside the inner core 6-1 can accommodate a second thermometer / barometer 6-4. This second temperature and pressure testing device 6 allows the liquid inside the test column to flow through the second annular channel 6-3, enabling the liquid pressure to be transmitted downwards to the lower packer 7 and allowing the liquid to enter the inner core 6-1, where the second thermometer / barometer 6-4 is used to test the temperature and pressure of the liquid.

[0070] In one specific embodiment, reference is made to Figures 4A to 4C As shown, the second temperature and pressure testing device 6 may also include a female buckle on the upper part of the second support body 6-2 and a male buckle on the lower part of the second support body 6-5, wherein the upper female buckle is connected to the upper packer 5 and the lower male buckle is connected to the lower packer 7.

[0071] In one specific embodiment, one or more tubing stubs may be connected between the second temperature and pressure testing device 6 and the upper packer 5, and between the second temperature and pressure testing device 6 and the lower packer 7, as needed, to extend the test string.

[0072] In an optional embodiment, refer to Figures 5A to 5C As shown, the aforementioned third temperature and pressure testing device 11 includes: a third support body 11-2, a third support inner core 11-1, and a third temperature and pressure gauge 11-3; wherein:

[0073] The third inner core 11-1 is disposed on the inner wall of the third inner core 11-2, and the third thermo-barometer 11-3 is disposed in the third inner core 11-1; a third annular channel 11-4 for flow passage is formed in the third inner core 11-2; a third connecting hole 11-5 is provided on the third inner core 11-1.

[0074] In this embodiment of the invention, the inner core 11-1 of the third support cylinder of the third temperature and pressure testing device 4 is connected to a portion of the inner wall of the third support cylinder body 11-2, with the remainder forming a third annular channel 11-4. The inner core 11-1 is a cylindrical space that can accommodate a third thermometer / barometer 11-3. The portion connecting the inner core 11-1 and the third support cylinder body 11-2 is drilled with the aforementioned third connecting hole 11-5 for communication between the inside and outside. Liquid outside the third temperature and pressure testing device 4 can enter the inner core 11-1 through the third connecting hole 11-5, allowing the temperature and pressure of the liquid to be monitored by the internal third thermometer / barometer 11-3. This third temperature and pressure testing device 11 is connected to a test column, allowing liquid outside the third support cylinder body 11-2 to enter the inner core 11-1 and allowing liquid inside the test column to flow through the third annular channel 11-4, thus forming a production channel. However, the liquids from both sides do not come into contact with each other, thus not affecting the monitoring results.

[0075] In one specific embodiment, reference is made to Figures 5A to 5C As shown, the third temperature and pressure testing device 4 may also include a female connector on the upper part of the third support body 11-2 and a male connector on the lower part of the second support body 11-2. The upper male connector is connected to the venting bypass valve 10, and the lower male connector is connected to the coupling positioner 12. Of course, when the test string does not include the coupling positioner 12, the lower male connector can be connected to the tailpipe 13.

[0076] In one specific embodiment, one or more oil pipe stubs may be connected between the third temperature and pressure testing device 11 and the venting bypass valve 10, and between the third temperature and pressure testing device 11 and the coupling positioner 12, as needed, to extend the test string.

[0077] In an alternative embodiment, refer to Figures 6 to 9 As shown, the upper packer 5 includes: a first spindle 5-1, a fixing sleeve 5-10, a plurality of first locking blocks 5-15, a first upper connector assembly (not shown in the figure) sequentially sleeved on the outside of the first spindle 5-1 from top to bottom, a rubber sleeve sealing mechanism (not shown in the figure), a first fixing plug 5-9, a supporting piston 5-11, a first unlocking piston 5-12, a first piston support sleeve 5-13, a slide valve 5-14, a first lower connector 5-16, and a first limiting sleeve 5-17;

[0078] The first limiting sleeve 5-17 is connected to the outer wall of the first lower connector 5-16;

[0079] The lower sidewall of the first mandrel 5-1 is provided with a plurality of rubber tube pressure transmission holes 5-1-1 and a plurality of slide valve pressure transmission holes 5-1-2 axially from top to bottom;

[0080] The fixed sleeve 5-10 has multiple test holes 5-10-1 circumferentially, the slide valve 5-14 has multiple test communication holes 5-14-3 correspondingly, and the side wall of the first lower connector 5-16 has multiple center communication holes 5-16-1 correspondingly.

[0081] The first fixing plug 5-9 is fixed to the first spindle 5-1. The inner wall of the first fixing plug 5-9 is provided with an annular groove (not shown in the figure) that communicates with the pressure transmission hole 5-1-1 of the rubber tube. Alternatively, there is a gap between the first fixing plug 5-9 and the first spindle 5-1 that communicates with the pressure transmission hole 5-1-1 of the rubber tube, so that the liquid in the first spindle 5-1 reaches the bottom of the rubber tube sealing mechanism and pushes the rubber tube sealing mechanism to set under the first pressure.

[0082] The upper end of the fixing sleeve 5-10 abuts against the rubber sleeve sealing mechanism, and the lower end of the fixing sleeve 5-10 abuts against the upper surface of the first limiting sleeve 5-17;

[0083] The first annular space 5-18 is formed between the supporting piston 5-11, the first fixed plug 5-9, the first spindle 5-1, and the fixed sleeve 5-10, which is used to support the overall upward movement of the piston 5-11, the first unlocking piston 5-12, the first locking block 5-15, and the first piston support sleeve 5-13 under pressure.

[0084] The first unlocking piston 5-12 is located between the supporting piston 5-11 and the first piston support sleeve 5-13;

[0085] The bottom end of the support piston 5-11 is provided with a plurality of radial through holes (not shown in the figure), and the outer wall of the first mandrel is provided with a plurality of locking block recesses (not shown in the figure). The plurality of first locking blocks 5-15 are correspondingly arranged in the plurality of radial through holes and abut against the locking block recesses.

[0086] The first unlocking piston 5-12 is sleeved on the outside of the first locking block 5-15. There is a gap between the first piston support sleeve 5-13 and the support piston 5-11 that connects to the pressure transmission hole 5-1-2 of the slide valve, so that the liquid in the first spindle 5-1 reaches the bottom end face of the first unlocking piston 5-12. Under the action of the first pressure, the first unlocking piston 5-12 is pushed upward, so that the first locking block 5-15 is unlocked. Under the action of the second pressure, the support piston 5-11, the first unlocking piston 5-12, the first locking block 5-15 and the first piston support sleeve 5-13 move upward synchronously in the first annular space 5-18, so that the slide valve 5-14 moves upward synchronously, thereby connecting the corresponding test hole 5-10-1, the test connecting hole 5-14-3 and the central connecting hole 5-16-1.

[0087] In this embodiment of the invention, the aforementioned support piston 5-11, first unlocking piston 5-12, first piston support sleeve 5-13, and slide valve 5-14 constitute the test slide valve mechanism of the upper packer 5.

[0088] In this invention, the upper packer 5 is a packer that is pressure-set and lift-unsealable. During the pressure-pressurization process, the rubber sleeve sealing mechanism is first expanded and set, and then the pressure continues to increase, causing the test slide valve mechanism to open. During the lifting of the test string, the rubber sleeve sealing mechanism loses its constraint and returns to its original state, and the support piston 5-11 and the first unlocking piston 5-12 move downwards relative to each other, causing the test slide valve mechanism to close. The test slide valve mechanism inside the upper packer can be opened by pressure-pressurization and closed by lifting, thereby realizing the opening and closing of the test channel.

[0089] In one specific embodiment, reference is made to Figures 6-9 As shown, the lower sidewall of the first mandrel 5-1 has multiple rubber sleeve pressure transmission holes 5-1-1 and multiple slide valve pressure transmission holes 5-1-2, evenly distributed along the circumference of the central tube, arranged sequentially from top to bottom. Below the slide valve pressure transmission hole 5-1-2 is a step, with two symmetrical mounting holes (not shown in the figure) drilled in the middle of the step. These holes mate with the two symmetrical connecting shafts 5-14-1 of the slide valve 5-14. The connecting shafts 5-14-1 can pass through the corresponding mounting holes and be welded to the bottom end face of the first piston support sleeve 5-13.

[0090] In this embodiment of the invention, the supporting piston 5-11 is a cylindrical body with an outer annular step formed at its outer diameter. There are multiple first locking blocks 5-15, which are evenly distributed along the circumference and pass through multiple radial through holes opened at the bottom end of the supporting piston 5-11, and abut against multiple locking block embedded grooves opened on the outer wall of the first mandrel 5-1. After the first locking block 5-15 is unlocked, it moves upward synchronously with the supporting piston 5-11. A first unlocking piston 5-12 is fitted outside the first locking block 5-15. The first unlocking piston 5-12 is a cylindrical body with its lower outer wall recessed inward and forming an annular step. A first piston support sleeve 5-13 is fitted outside the first unlocking piston 5-12. The first piston support sleeve 5-13 is a cylindrical body with its upper outer diameter larger than its lower outer diameter and its upper inner diameter larger than its lower inner diameter. The upper side of the first piston support sleeve 5-13 is fitted below the first unlocking piston 5-12, and its top end abuts against the annular step of the first unlocking piston 5-12. The inner end face of the first unlocking piston 5-12 abuts against each of the first locking blocks 5-15 that protrude to the outside of the support piston 5-11, thereby constraining each of the first locking blocks 5-15 from moving outward and achieving locking. The bottom end of the first piston support sleeve 5-13 is located above the multiple slide valve pressure transmission holes 5-1-2 on the first spindle 5-1.

[0091] The lower part of the slide valve 5-14 is the slide valve piston 5-14-2, and two connecting shafts 5-14-1 are symmetrically welded to its upper end face. The slide valve piston 5-14-2 is a thick-walled cylindrical shape, with multiple interconnected test communication holes 5-14-3 drilled inward on the side and upward on the bottom. The number of side holes is the same as the number of test holes 5-10-1. When installing the slide valve piston 5-14-2, the orientation of the side holes in the circumferential direction is the same as the orientation of the test holes 5-10-1 on the fixing sleeve 5-10, so that the two can be aligned and connected when the slide valve 5-14 moves upward. The connecting shafts 5-14-1 are cylinders symmetrically welded to the top surface of the slide valve piston 5-14-2. They can pass through the hole on the step of the first mandrel 5-1 and be welded to the bottom end face of the first piston support sleeve 5-13, thereby connecting the slide valve piston 5-14-2 and the first piston support sleeve 5-13.

[0092] The top of the first lower connector 5-16 is threaded to the outer wall of the bottom end of the first mandrel 5-1. The first lower connector 5-16 is hollow, with several interconnected central connecting holes 5-16-1 drilled from the top surface downwards and from the inner surface outwards. The holes on the top surface and the inner surface are in the same spatial orientation to ensure that the two holes can intersect and communicate. The first limiting sleeve 5-17 is threaded to the outer wall of the first lower connector 5-16, and its top end abuts against the bottom end of the fixing sleeve 5-10.

[0093] The first locking block 5-15 is unlocked by the slide valve pressure transmission hole 5-1-2 transmitting hydraulic pressure through the gap between the first piston support sleeve 5-13 and the support piston 5-11 to the bottom end face of the first unlocking piston 5-12. Under the action of the first pressure, the first unlocking piston 5-12 is pushed upward to abut against the lower surface of the outer annular step of the support piston 5-11, thereby providing space for the first locking block 5-15 to move outward. The first locking block 5-15 moves outward within the radial through hole of the supporting piston 5-11, disengaging from the locking block recess on the outer wall of the first spindle 5-1, and abutting against the upper inner surface of the first piston support sleeve 5-13. This causes the supporting piston 5-11, the first unlocking piston 5-12, the first locking block 5-15, and the first piston support sleeve 5-13 to form a whole. When subjected to upward hydraulic pressure at the bottom, it moves upward within the first annular space 5-18, thereby unlocking the piston and causing the slide valve 5-14 to move upward synchronously. This further connects the corresponding test hole 5-10-1, test connecting hole 5-14-3, and central connecting hole 5-16-1.

[0094] In one specific embodiment, reference is made to Figures 6-9 As shown, the rubber sleeve sealing mechanism includes: a first rubber sleeve gasket 5-4, a first rubber sleeve support 5-5, a first rubber sleeve assembly 5-6, a first upper cone 5-7, and a first support sleeve 5-8;

[0095] The first rubber sleeve gasket 5-4 abuts against the bottom end of the first upper connector assembly;

[0096] The first support sleeve 5-8 is slidably sealed to the first spindle 5-1, and the first upper cone 5-7 is connected to the first support sleeve 5-8;

[0097] The upper end of the fixing sleeve 5-10 abuts against the outer conical surface of the first upper cone 5-7, and the lower end of the fixing sleeve 5-10 abuts against the upper surface of the first limiting sleeve 5-17.

[0098] In one specific embodiment, the first upper connector assembly includes a first upper connector 5-2 and a first upper connector connecting sleeve 5-3; the first upper connector 5-2 is connected to the top end of the first spindle 5-1; the top end of the first upper connector connecting sleeve 5-3 is connected to the outer wall of the bottom end of the first upper connector 5-2; and the first rubber sleeve gasket 5-4 abuts against the bottom end of the first upper connector connecting sleeve 5-3.

[0099] Specifically, the bottom end of the first upper connector 5-2 is sleeved and threadedly connected to the top outer wall of the first mandrel 5-1, and a double sealing ring is provided at the threaded connection between the first upper connector 5-2 and the first mandrel 5-1; the first upper connector connecting sleeve 5-3 is sleeved on the outside of the first mandrel 5-1, and its top end is threadedly connected to the bottom outer wall of the first upper connector 5-2.

[0100] The first rubber sleeve gasket 5-4 abuts against the bottom end of the first upper connector connecting sleeve 5-3, and its bottom surface is machined with an inverted V-shaped conical groove that matches the first rubber sleeve support 5-5; the first rubber sleeve assembly 5-6 consists of two rubber sleeves and an intermediate gasket disposed between the two rubber sleeves; the rubber sleeves are rubber sleeves with an arc surface machined on one end of the top surface, the upper rubber sleeve is set with the arc surface facing upward, and the lower rubber sleeve is set with the arc surface facing downward.

[0101] The first upper cone 5-7 and the first support sleeve 5-8 are fitted from top to bottom on the outside of the first mandrel 5-1. The first upper cone 5-7 is a cone with an outer diameter that gradually decreases from top to bottom. Its top end rests on the bottom surface of the lower rubber tube, and its top surface is machined with a conical groove that matches the bottom surface of the rubber tube. The bottom end of the first upper cone 5-7 is fitted and fixed on the top outer wall of the first support sleeve 5-8. The two are connected by threads.

[0102] The lower end of the first support sleeve 5-8 is stepped, and is a cylindrical sleeve with an upper outer diameter smaller than the lower outer diameter and an upper inner diameter smaller than the lower inner diameter. The first fixing plug 5-9 is a cylindrical sleeve with an upper outer diameter smaller than the lower outer diameter, so that its upper side is inserted into the annular groove formed by the lower end of the first support sleeve 5-8 and the first mandrel 5-1, and is fixedly installed on the outside of the first mandrel 5-1 by threads. The upper inner wall of the first fixing plug 5-9 is provided with an annular groove (not shown in the figure) that communicates with multiple rubber tube pressure transmission holes 5-1-1, or there is a gap between the first fixing plug 5-9 and the first mandrel that communicates with the rubber tube pressure transmission holes 5-1-1, so that the hydraulic pressure in the first mandrel 5-1 can pass through the rubber tube pressure transmission holes 5-1-1, the annular groove or the above-mentioned gap in sequence, and act on the lower surface of the lower end of the first support sleeve 5-8.

[0103] The fixing sleeve 5-10 is cylindrical, with multiple test holes 5-10-1 evenly distributed along its circumference at its lower part. An annular space exists between the inner wall of the fixing sleeve 5-10 and the outer wall of the first mandrel 5-1, forming the space for the vertical movement of all piston components. The upper part of the fixing sleeve 5-10 abuts against the outer conical surface of the first upper cone 5-7, and the lower part abuts against the upper surface of the first limiting sleeve 5-17.

[0104] In this embodiment of the invention, the specific working principle of the upper packer is as follows:

[0105] (1) Lowering process: The first locking block 5-15 locks the support piston 5-11, the first unlocking piston 5-12, the first piston support sleeve 5-13 and the slide valve 5-14 onto the first spindle 5-1, to prevent the piston from moving upward and opening the slide valve 5-14 due to pressure excitement during the lowering process of the test column.

[0106] (2) Setting and slide valve opening process: After the entire tool string is lowered into place by the continuous tube 1, the ground pressure is increased to the first pressure through the inside of the continuous tube 1. The pressure is transmitted to the upper packer 5, and through the pressure transmission hole 5-1-1 of the rubber sleeve and the pressure transmission hole 5-1-2 of the slide valve, the hydraulic pressure is simultaneously transmitted to the lower surface of the lower end of the first support sleeve 5-8 and the bottom end face of the first unlocking piston 5-12. Specifically, this includes:

[0107] Hydraulic pressure is transmitted through the rubber sleeve pressure transmission hole 5-1-1 to the annular gap between the bottom of the first fixed plug 5-9 and the first support sleeve 5-8, and acts on the lower surface of the bottom of the first support sleeve 5-8, forcing the first support sleeve 5-8 to move upward within the fixed sleeve 5-10, thereby pushing the first upper cone 5-7 upward, while the first upper connector connecting sleeve 5-3, the first rubber sleeve gasket 5-4, and the first rubber sleeve support 5-5 remain stationary, thereby compressing the first rubber sleeve assembly 5-6, causing the first rubber sleeve assembly 5-6 to expand and deform, sealing the well shaft;

[0108] Simultaneously, hydraulic pressure is transmitted through the slide valve pressure transmission hole 5-1-2 to the gap between the first piston support sleeve 5-13 and the support piston 5-11, acting on the bottom end face of the first unlocking piston 5-12. This pushes the first unlocking piston 5-12 upward to abut against the lower surface of the outer annular step of the support piston 5-11, causing the first locking block 5-15 to move outward and unlock. The support piston 5-11, the first unlocking piston 5-12, the first locking block 5-15, and the first piston support sleeve 5-13 form a whole. As the pressure continues to rise to the second pressure, hydraulic pressure acts on the bottom of the first piston support sleeve 5-13, pushing the whole upward within the first annular space 5-18, thereby driving the slide valve 5-14 at the bottom of the first piston support sleeve 5-13 upward. When the slide valve 5-14 rises until the test connection hole 5-14-3 aligns and connects with the test hole 5-10-1, a test channel is formed. The test channel consists of test hole 5-10-1, test connecting hole 5-14-3 and central connecting hole 5-16-1, forming a channel for the external liquid of the test tube to flow to the first mandrel 5-1.

[0109] (3) Slide valve closing and unsealing process: The entire tool string is lifted through the continuous tube 1, the first lower connector 5-16 and the first limiting sleeve 5-17 at the bottom of the upper packer 5 move upward, the first limiting sleeve 5-17 drives the fixed sleeve 5-10 to move upward synchronously, at this time the slide valve 5-14 is relatively stationary, the test hole 5-10-1 and the test connecting hole 5-14-3 are misaligned, and the test slide valve mechanism is closed;

[0110] The first upper connector 5-2 and the first upper connector connecting sleeve 5-3 move upward synchronously, losing their restraining effect on the first rubber sleeve assembly 5-6. The first rubber sleeve assembly 5-6 naturally retracts, returning to its state before expansion and deformation, and loses its sealing effect on the well shaft.

[0111] At the same time, the first mandrel 5-1 moves upward synchronously, while the whole assembly consisting of the support piston 5-11, the first unlocking piston 5-12, the first locking block 5-15, and the first piston support sleeve 5-13 remains stationary. When the first locking block 5-15 is exactly pressed inward into the multiple locking block recesses correspondingly opened on the outer wall of the first mandrel 5-1, the support piston 5-11, the first unlocking piston 5-12, the first locking block 5-15, and the first piston support sleeve 5-13 are locked onto the first mandrel 5-1, restoring the upper packer 5 to its state before setting, thus completing the test slide valve closing and unsealing process.

[0112] In an optional embodiment, refer to Figure 10 and Figure 11As shown, the lower packer includes: a second spindle 7-1, a seat support sleeve 7-14, multiple second locking blocks 7-17, a sliding sleeve 7-15, a second unlocking piston 7-16, a second piston support sleeve 7-18, an upper connecting mechanism (not shown in the figure) sequentially sleeved on the outside of the second spindle 7-1 from top to bottom, a setting assembly (not shown in the figure), a slip assembly (not shown in the figure), an upper setting piston 7-11, a second fixing plug 7-12, a seat piston 7-13, and a lower connecting mechanism (not shown in the figure);

[0113] The lower sidewall of the second mandrel 7-1 is provided with a plurality of seat pressure transmission holes 7-1-1 and a plurality of seat pressure transmission holes 7-1-2 along the axial direction from top to bottom;

[0114] The second fixing plug 7-12 is fixed to the second mandrel 7-1. The inner wall of the second fixing plug 7-12 is provided with an annular groove (not shown in the figure) that communicates with the setting pressure transmission hole 7-1-1. Alternatively, there is a gap between the second fixing plug 7-12 and the second mandrel 7-1 that communicates with the setting pressure transmission hole 7-1-1, so that the liquid in the second mandrel 7-1 reaches the bottom of the upper setting piston 7-11 and pushes the setting assembly to set under the first pressure.

[0115] The upper end of the seat support sleeve 7-14 is supported at the bottom end of the slip assembly, and the top of the seat piston 7-13 is sleeved on the lower end of the seat support sleeve 7-14. The seat piston 7-13, the second fixing plug 7-12, the second spindle 7-1 and the seat support sleeve 7-14 form a second annular space 7-21.

[0116] The outer side of the seat piston 7-13 is connected to the sliding sleeve 7-15, and the second unlocking piston 7-16 is located between the seat piston 7-13 and the second piston support sleeve 7-18;

[0117] The bottom end of the seat piston 7-13 is provided with a plurality of radial through holes, and the outer wall of the second spindle 7-1 is provided with a plurality of locking block inlay grooves. The plurality of second locking blocks 7-17 are correspondingly arranged in the plurality of radial through holes and abut against the locking block inlay grooves.

[0118] The second unlocking piston 7-16 is sleeved on the outside of the second locking block 7-17. There is a gap between the second piston support sleeve 7-18 and the seat piston 7-13 that connects to the seat pressure transmission hole 7-1-2. Under the action of the first pressure, the second unlocking piston 7-16 is pushed upward, thereby unlocking the second locking block 7-17. Under the action of the first pressure, the seat piston 7-13, the second unlocking piston 7-16, the second locking block 7-17 and the second piston support sleeve 7-18 move upward synchronously in the second annular space 7-21, thereby driving the seat support sleeve 7-14 and the sliding sleeve 7-15 upward.

[0119] In one specific embodiment, reference is made to Figure 10 and Figure 11 As shown, the second mandrel 7-1 has a plurality of seat pressure transmission holes 7-1-1 and a plurality of seat pressure transmission holes 7-1-2 evenly distributed along the circumference of the second mandrel from top to bottom on the lower side wall.

[0120] In one specific embodiment, reference is made to Figure 10 and Figure 11 As shown, the sealing assembly includes, from top to bottom, a second rubber sleeve gasket 7-4, a second rubber sleeve support 7-5, a second rubber sleeve assembly 7-6, a second upper cone 7-7, and a second support sleeve 7-8, which are sequentially fitted outside the second mandrel 7-1; the upper end of the slip assembly abuts against the outer conical surface of the second upper cone 7-7; the second support sleeve 7-8 slides and seals with the second mandrel 7-1; the second rubber sleeve gasket 7-4 abuts against the bottom end of the second upper connector assembly; the second upper cone 7-7 is connected to the second support sleeve 7-8.

[0121] In one specific embodiment, reference is made to Figure 10 and Figure 11 As shown, the upper connecting mechanism consists of a second upper connector 7-2 and a second upper connector connecting sleeve 7-3; the bottom end of the second upper connector 7-2 is sleeved and threadedly connected to the top outer wall of the second spindle 7-1, and a double sealing ring is provided at the threaded connection between the second upper connector 7-2 and the second spindle 7-1; the second upper connector connecting sleeve 7-3 is sleeved on the outside of the second spindle 7-1, and its top end is threadedly connected to the bottom outer wall of the second upper connector 7-2.

[0122] The second rubber sleeve gasket 7-4 abuts against the bottom end of the second upper connector connecting sleeve 7-3, and its bottom surface is machined with an inverted V-shaped conical groove that mates with the second rubber sleeve support 7-5. The second rubber sleeve assembly 7-6 consists of two rubber sleeves and an intermediate gasket placed between the two rubber sleeves. The rubber sleeves are rubber sleeves with an arc surface machined on one end, with the upper rubber sleeve facing upwards and the lower rubber sleeve facing downwards. The second upper cone 7-7 and the second support sleeve 7-8 are fitted onto the outside of the second mandrel 7-1 from top to bottom. The second upper cone 7-7 is a cone with an outer diameter that gradually decreases from top to bottom, and its top end abuts against the bottom surface of the lower rubber sleeve, and its top surface is machined with a conical groove that mates with the bottom surface of the rubber sleeve. The bottom end of the second upper cone 7-7 is fitted onto and fixed to the top outer wall of the second support sleeve 7-8, and the two are connected by threads.

[0123] In one specific embodiment, reference is made to Figure 10 and Figure 11 As shown, the slip assembly includes a slip 7-9 and a slip seat 7-10; the slip 7-9 and the slip seat 7-10 are sequentially sleeved on the outside of the second support sleeve 7-8 from top to bottom; the upper inner wall of the slip 7-9 has a conical surface that mates with the outer wall of the second upper cone 7-7 and abuts against the outer conical surface of the second upper cone 7-7; the slip seat 7-10 is fixed to the bottom end of the second support sleeve 7-8.

[0124] Specifically, the slip 7-9 and slip seat 7-10 can be sequentially fitted onto the outside of the second support sleeve 7-8 from top to bottom. The upper inner wall of the slip 7-9 is a conical surface that matches the outer wall of the second upper cone 7-7. The slip seat 7-10 is fixed to the outer annular protrusion at the bottom of the second support sleeve 7-8 by an annular step provided on its inner wall, so that the slip seat 7-10 can only move up or down relative to the second support sleeve 7-8.

[0125] In one specific embodiment, reference is made to Figure 10 and Figure 11 As shown, the lower connecting mechanism includes a second limiting sleeve 7-19 and a second lower connector 7-20; the top end of the second lower connector 7-20 is connected to the bottom end of the second spindle 7-1; the sliding sleeve 7-15 is sleeved on the outside of the second lower connector 7-20, and a seal is formed between the outer wall of the top end of the second lower connector 7-20 and the sliding sleeve 7-15; the top end of the sliding sleeve 7-15 abuts against the lower end face of the seat piston 7-13 and is connected to the seat piston 7-13; the second limiting sleeve 7-19 is connected to the outer wall of the second lower connector 7-20, and the bottom end of the sliding sleeve 7-15 abuts against the second limiting sleeve 7-19.

[0126] Specifically, the second lower connector 7-20 can be threaded to the outer wall of the bottom end of the second mandrel 7-1 at its top end, and an annular boss is provided on the outer wall of its top end, forming a seal with the sliding sleeve 7-15; the sliding sleeve 7-15 is sleeved on the outside of the second lower connector 7-20, and its top end abuts against the lower end face of the first outer annular step of the seat piston 7-13 and is threaded to the outer wall of the seat piston 7-13, and its inner wall abuts against the annular boss of the lower connector 7-20; the limiting sleeve 7-19 is threaded to the outer wall of the lower connector 7-20, and its top end abuts against the bottom end of the sliding sleeve 7-15.

[0127] In this embodiment of the invention, the upper setting piston 7-11 is a cylindrical sleeve with an upper outer diameter smaller than its lower outer diameter and an upper inner diameter smaller than its lower inner diameter; the second fixing plug 7-12 is a cylindrical sleeve with an upper outer diameter smaller than its lower outer diameter, with its upper side inserted into the annular groove formed by the lower side of the upper setting piston 7-11 and the second mandrel 7-1, and fixedly installed on the outside of the second mandrel 7-1 by threads; the upper inner wall of the second fixing plug 7-12 is provided with an annular groove (not shown in the figure) that communicates with multiple setting pressure transmission holes 7-1-1, or there is a gap between the second fixing plug 7-12 and the second mandrel 7-1 that communicates with the setting pressure transmission holes 7-1-1, so that the hydraulic pressure in the second mandrel 7-1 can pass through the setting pressure transmission holes 7-1-1, the annular groove or the gap in sequence, and act on the upper setting piston 7-11.

[0128] The seat piston 7-13 is a cylindrical body with its outer diameter decreasing from top to bottom and forming a first outer annular step and a second outer annular step. The top of the first outer annular step of the seat piston 7-13 is sleeved on the lower end of the seat support sleeve 7-14, and the annular part between the first outer annular step and the second outer annular step is connected to the sliding sleeve 7-15 by a thread.

[0129] The upper end of the seat support sleeve 7-14 is supported on the bottom end of the slip seat 7-10, so that the seat piston 7-13, the second fixed plug 7-12, the second spindle 7-1 and the seat support sleeve 7-14 together form a second annular space 7-21. The second annular space 7-21 is used for the entire assembly of the seat piston 7-13, the second unlocking piston 7-16, the second locking block 7-17 and the second piston support sleeve 7-18 to be pressed upward.

[0130] The second unlocking piston 7-16 is located between the seat piston 7-13 and the second piston support sleeve 7-18.

[0131] Multiple second locking blocks 7-17 are evenly distributed circumferentially and pass through multiple radial through holes opened at the bottom end of the seat piston 7-13, and abut against multiple locking block embedded grooves correspondingly opened on the outer wall of the second spindle 7-1; after the second locking blocks 7-17 are unlocked, they move upward synchronously with the seat piston 7-13. A second unlocking piston 7-16 is sleeved on the outside of the second locking blocks 7-17. The second unlocking piston 7-16 is a cylindrical body with its lower outer wall recessed inward and forming an annular step; a second piston support sleeve 7-18 is sleeved on the outside of the second unlocking piston 7-16. The second piston support sleeve 7-18 is a cylindrical body with an upper outer diameter larger than its lower outer diameter and an upper inner diameter larger than its lower inner diameter.

[0132] The upper side of the second piston support sleeve 7-18 is fitted onto the lower side of the second unlocking piston 7-16, and the top end abuts against the annular step of the second unlocking piston 7-16. The inner end face of the second unlocking piston 7-16 abuts against each of the second locking blocks 7-17 that protrude to the outside of the seat piston 7-13, thereby constraining each of the second locking blocks 7-17 from moving outward and achieving locking. The bottom end of the second piston support sleeve 7-18 is located above the multiple seat pressure transmission holes 7-1-2 on the second spindle 7-1.

[0133] The second locking block 7-17 is unlocked as follows: hydraulic pressure is transmitted through the seat-locking pressure transmission hole 7-1-2 to the bottom end face of the second unlocking piston 7-16 via the gap between the second piston support sleeve 7-18 and the seat-locking piston 7-13. This pushes the second unlocking piston 7-16 upward to abut against the lower surface of the second outer annular step of the seat-locking piston 7-13, thus providing space for the second locking block 7-17 to move outward. The second locking block 7-17 moves outward within the radial through hole of the seat-locking piston 7-13, disengaging from the locking block recess on the outer wall of the second spindle 7-1, and abutting against the upper inner surface of the second piston support sleeve 7-18. This causes the seat-locking piston 7-13, the second unlocking piston 7-16, the second locking block 7-17, and the second piston support sleeve 7-18 to form a single unit. When subjected to upward hydraulic pressure at the bottom, it moves upward within the second annular space 7-21, thereby achieving unlocking.

[0134] To ensure the sealing of the piston assembly, a double sealing ring is provided between the upper inner wall of the upper setting piston 7-11 and the outer wall of the second spindle 7-1; a double sealing ring is provided between the lower outer wall of the upper setting piston 7-11 and the inner wall of the seat support sleeve 7-14; a double sealing ring is provided between the lower inner wall of the fixing plug 212 and the outer wall of the second spindle; a double sealing ring is provided between the lower outer wall of the second fixing plug 7-12 and the inner wall of the seat support sleeve 7-14; a double sealing ring is provided between the outer wall of the annular boss of the lower connector 7-20 and the inner wall of the sliding sleeve 7-15; a double sealing ring is provided between the inner wall of the seat piston 7-13 and the outer wall of the second spindle 7-1; a double sealing ring is provided between the inner wall of the second unlocking piston 7-16 and the outer wall of the second spindle 7-1; and a double sealing ring is provided between the outer wall of the second unlocking piston 7-16 and the inner wall of the sliding sleeve 7-15.

[0135] In this embodiment of the invention, the specific working principle of the lower packer is as follows:

[0136] (1) Lowering process: The second locking block 7-17 locks the setting assembly, slip assembly, upper setting piston 7-11, second fixed plug 7-12 and seat piston 7-13 onto the second spindle 7-1 to resist obstruction during the lowering process and prevent the lower packer from setting prematurely during the lowering process.

[0137] (2) Setting process: After the entire tool string is lowered into position via the continuous tube 1, the ground pressure is increased through the inside of the continuous tube 1, and the pressure is transmitted to the lower packer 7. Through the setting pressure transmission hole 7-1-1 and the seat pressure transmission hole 7-1-2, the hydraulic pressure is simultaneously transmitted to the upper setting piston 7-11, the second fixed plug 7-12, and the seat piston 7-13. Specifically, this includes:

[0138] Hydraulic pressure is transmitted through the setting pressure transmission hole 7-1-1 to the annular gap between the second fixed plug 7-12 and the upper setting piston 7-11, and acts on the lower surface of the upper setting piston 7-11, forcing the upper setting piston 7-11 to move upward within the seat support sleeve 7-14, thereby pushing upward against the second support sleeve 7-8. The second support sleeve 7-8 connects to the second upper cone 7-7 and moves upward synchronously, while the second upper connector connecting sleeve 7-3, the second rubber sleeve gasket 7-4, and the second rubber sleeve support 7-5 remain stationary, thereby compressing the second rubber sleeve assembly 7-6, causing the second rubber sleeve assembly 7-6 to expand and deform, sealing the wellbore.

[0139] Simultaneously, hydraulic pressure is transmitted through the seat-locking pressure hole 7-1-2 to the gap between the second piston support sleeve 7-18 and the seat-locking piston 7-13, acting on the bottom end face of the second unlocking piston 7-16. This pushes the second unlocking piston 7-16 upward to abut against the lower surface of the second outer annular step of the seat-locking piston 7-13, causing the second locking block 7-17 to move outward and unlock. The seat-locking piston 7-13, the second unlocking piston 7-16, the second locking block 7-17, and the second piston support sleeve 7-18 form a whole. Hydraulic pressure acts on the bottom of the second piston support sleeve 7-18, pushing this whole upward within the second annular space 7-21, thereby causing the seat-locking support sleeve 7-14 and the sliding sleeve 7-15 to move upward. The upward movement of the seat support sleeve 7-14 provides space for the upper seat piston 7-11 to move upward, because the upper seat piston 7-11 needs to slide up and down in the second annular space 7-21 between the seat support sleeve 7-14 and the second spindle 7-1; on the other hand, the upward movement of the seat support sleeve 7-14 pushes the slip seat 7-10 upward.

[0140] The two processes described above are completed simultaneously, and the second rubber sleeve assembly 7-6 is compressed to its maximum limit. The pressure is further increased to the second pressure, causing the slip seat 7-10 to move upwards, pushing the slip 7-9 upwards along the conical surface of the outer wall of the second upper cone 7-7, causing the slip 7-9 to open and support itself on the inner wall of the wellbore, thus ensuring the stability of the entire test string.

[0141] (3) Unsealing process: The entire tool string is lifted through the continuous pipe 1. The second upper connector 7-2 and the second upper connector connecting sleeve 7-3 move upward synchronously, losing their constraint on the second rubber sleeve assembly 7-6. The second rubber sleeve assembly 7-6 naturally retracts and returns to its state before expansion and deformation, losing its sealing effect on the well barrel.

[0142] The second mandrel 7-1 moves upward along with the second upper connector 7-2 and the second upper connector connecting sleeve 7-3, continuing to lift the test column. The second mandrel 7-1, along with the second fixing plug 7-12, moves upward and abuts against the lower end face of the upper setting piston 7-11, thereby driving the upper setting piston 7-11, the second support sleeve 7-8, and the second upper cone 7-7 upward, losing their constraint on the slip 7-9, and restoring the slip 7-9 to its state before setting.

[0143] At the same time, the second spindle 7-1 drives the limiting sleeve 7-19 and the lower connector 7-20 to move upward synchronously. At this time, the entire assembly consisting of the seat piston 7-13, the second unlocking piston 7-16, the second locking block 7-17, and the second piston support sleeve 7-18 remains stationary. When the limiting sleeve 7-19 moves upward to abut the bottom surface of the sliding sleeve 7-15, the second locking block 7-17 precisely abuts inward into the multiple locking block recesses correspondingly opened on the outer wall of the second spindle 7-1, thereby locking the piston assembly onto the second spindle 7-1, restoring the lower packer 7 to its state before setting, and achieving unlocking.

[0144] In an optional embodiment, refer to Figures 12 to 14 As shown, the test string also includes a spring stabilizer 8; see reference Figure 1 and Figure 2 As shown, the spring stabilizer 8 is located between the lower packer 7 and the closable check valve 9.

[0145] The spring straightener 8 includes a central shaft 8-1 and an upper limit ring 8-2, an upper sliding sleeve 8-3, an upper limit sleeve 8-4, multiple straightening blocks 8-5, a support spring 8-6, a lower limit sleeve 8-7, a lower sliding sleeve 8-8, and a lower limit ring 8-9 sleeved on the central shaft 8-1.

[0146] The upper sliding sleeve 8-3 and the lower sliding sleeve 8-8 are respectively fixed to the central shaft 8-1 by sliding sleeve shear pins 8-9, and limit snap rings 8-10 are respectively provided between the upper sliding sleeve 8-3 and the lower sliding sleeve 8-8 and the central shaft 8-1;

[0147] The plurality of straightening blocks 8-5 are aligned and fitted onto the central axis 8-1;

[0148] The upper and lower ends of the straightening block 8-5 are respectively narrowed to form two steps, and are supported by the support spring 8-6;

[0149] The upper limit sleeve 8-4 and the lower limit sleeve 8-7 are respectively fitted onto the first step at the upper and lower ends of the straightening block 8-5;

[0150] The central shaft 8-1 has an upper step and a lower step. An upper pressure transmission hole 8-1-1 is radially arranged at the upper part of the upper step, below the upper sliding sleeve. A lower pressure transmission hole 8-1-2 is radially arranged at the lower part of the lower step, above the lower sliding sleeve 8-8. This allows the liquid in the central shaft 8-1 to reach the lower end face of the upper sliding sleeve 8-3 through the upper pressure transmission hole 8-1-1, and then reach the upper end face of the lower sliding sleeve 8-8 through the lower pressure transmission hole 8-1-2. Under the first pressure, the corresponding... The sliding sleeve shear pin 8-9 causes the upper sliding sleeve 8-3 and the lower sliding sleeve 8-8 to move the upper limit sleeve 8-4 and the lower limit sleeve 8-7 upward and downward respectively to the second step of the straightening block 8-5, so that the straightening block 8-5 expands outward into the wellbore under the elastic force of the support spring 8-6; and, under the second pressure, the upper sliding sleeve 8-3 moves upward to the upper limit ring 8-2 and is locked by the limit snap ring 8-10, and the lower sliding sleeve 8-8 moves downward to the lower limit ring 8-9 and is locked by the limit snap ring 8-10.

[0151] In this embodiment of the invention, the upper limit ring 8-2 is fixedly installed on the central shaft 8-1, near the upper male buckle. Both the upper sliding sleeve 8-3 and the lower sliding sleeve 8-8 are cylindrical, and are respectively fixed to the central shaft 8-1 by sliding sleeve shear pins 8-9. Limiting springs 8-10 are respectively provided between the upper sliding sleeve 8-3 and the lower sliding sleeve 8-8 and the central shaft 8-1. Six straightening blocks 8-5 are aligned and fitted onto the central shaft 8-1, with two stepped sections formed by necking at both ends. The internal structure is supported by a support spring 8-6, and the first step at both ends is fixed by an upper limit sleeve 8-4 and a lower limit sleeve 8-7, respectively, making the six straightening blocks 8-5 a single unit. The upper limit sleeve 8-4 is fixedly connected to the upper sliding sleeve 8-3, and the lower limit sleeve 8-7 is fixedly connected to the lower sliding sleeve 8-8.

[0152] In an optional embodiment, the closable flow valve includes a valve body 9-1, a rubber ring sleeve 9-3, and a ball seat 9-2 built into the valve body 9-1;

[0153] The valve body 9-1 is integrally formed with the central shaft 8-1, the lower limiting ring 8-9 is sleeved on the outside of the valve body 9-1, and a limiting snap ring 8-10 is provided between the sliding sleeve 8-8 and the valve body 9-1.

[0154] Multiple flow holes 9-1-1 are also provided on the side wall of the valve body 9-1 along the circumferential direction;

[0155] The ball seat 9-2 is located above the flow hole 9-1-1 and is fixed inside the valve body 9-1 by ball seat shear pins 9-2-1 arranged circumferentially.

[0156] The ball seat 9-2 has a built-in blocking ball 9-2-2, and multiple ball-stopping pins 9-2-3 are circumferentially inserted on the side wall of the valve body 9-1 located above the ball seat 9-2.

[0157] The rubber ring sleeve 9-3 is fitted onto the outside of the valve body 9-1;

[0158] The bottom end of the sliding sleeve 8-8 is located above the flow hole 9-1-1;

[0159] The rubber ring sleeve 9-3 is disposed below the flow hole 9-1-1 and is fixed to the valve body 9-1 by the sleeve shear pins 9-3-1 arranged along the circumferential direction;

[0160] The lower limiting ring 8-9 is spaced apart from the rubber ring sleeve 9-3;

[0161] The flow passage 9-1-1 is used to communicate with the annulus during the process of the test string being lowered into the wellbore, so as to push the plugging ball 9-2-2 away from the ball seat 9-2 and allow the liquid in the annulus to enter the continuous tubing;

[0162] The sealing ball 9-2-2 is used to sit on the ball seat under the first pressure to close the flow channel;

[0163] The sliding sleeve 8-8 is specifically used to cut off the sliding sleeve shear pin 8-9 under the first pressure, to close the flow hole 9-1-1, and to move down to the rubber ring sleeve 9-3 under the second pressure, to cut off the sleeve shear pin 9-3-1, so as to continue to move down to the lower limit ring 8-9 and be locked by the limit snap ring 8-10.

[0164] In one specific embodiment, with the upper and lower packers in the unsealed state, the sealing ball 9-2-2 is also used to sit on the ball seat under the third pressure, compressing and shearing the ball seat pins. The third pressure is greater than the second pressure.

[0165] In this embodiment of the invention, the ball seat 9-2 is located above the flow hole 9-1-1 and is fixed inside the valve body 9-1 by a plurality of ball seat shear pins 9-2-1 evenly distributed along the circumferential direction; the ball seat 9-2 is a cylindrical body, and its upper inner wall is a conical surface with an inner diameter that gradually decreases from top to bottom, so that the sealing ball 9-2-2 inside the ball seat 9-2 sits on the conical surface, forming the structure of a one-way valve; a plurality of ball-stopping pins 9-2-3 are evenly distributed along the circumferential direction on the side wall of the central axis 8-1 located above the ball seat 9-2.

[0166] A sliding sleeve 8-8, a rubber ring sleeve 9-3, and a lower limiting ring 8-9 are sequentially fitted from top to bottom on the outside of the valve body 9-1; the bottom end of the sliding sleeve 8-8 is located above the flow hole 9-1-1. The rubber ring sleeve 9-3 is located below the flow hole 9-1-1 and is fixed to the valve body 9-1 by multiple sleeve shear pins 9-3-1 evenly distributed along the circumference; the lower limiting ring 8-9 is spaced apart from the rubber ring sleeve 9-3 and fixed to the outer wall of the valve body 9-1. To ensure the overall sealing performance of the closable single-flow valve 9, double sealing rings are provided on each contact surface.

[0167] In this embodiment of the invention, the closable check valve allows liquid to enter the tubing through the flow orifice during the lowering process to balance the tubing pressure and prevent the continuous tubing from being crushed. After the operation is completed, it can be permanently closed by pressurization.

[0168] In an optional embodiment, the venting bypass valve 10 includes an upper valve body 10-1, a lower valve body 10-2, and a venting blind plug 10-3;

[0169] The upper valve body is connected to the closable single-flow valve 9;

[0170] The lower valve body 10-2 is connected to the third temperature and pressure testing device;

[0171] The venting plug 10-3 has a blind hole opened axially upward from the bottom surface;

[0172] The venting blind plug 10-3 is fixed inside the upper valve body 10-1 by venting shear pins 10-4 arranged circumferentially; the venting blind plug 10-3 is in a sealing fit with the upper valve body 10-1;

[0173] Multiple bypass holes 10-5 are provided circumferentially on the side wall of the upper valve body 10-1 at a position below the venting blind plug 10-3. When the upper and lower packers are unsealed, the venting blind plug 10-3 can shear the venting shear pin 10-4 under the action of the fourth pressure, so that the venting blind plug 10-3 moves down to the top surface of the lower valve body 10-2, so that the bypass holes 10-5 are connected to the annulus of the oil jacket.

[0174] Specifically, the upper valve body 10-1 and the lower valve body 10-2 are both cylindrical bodies, with the top end of the lower valve body 10-2 threadedly connected to the inner wall of the bottom end of the upper valve body 10-1; the venting blind plug 10-3 is a cylinder with an outer diameter matching the inner diameter of the upper valve body 10-1, and a blind hole is formed axially upward from its bottom surface; the venting blind plug 10-3 is fixed inside the upper valve body 10-1 by venting shear pins 10-4 evenly distributed along the circumferential direction, and is located below the venting blind plug 10-3. Multiple bypass holes 10-5 are evenly distributed along the circumferential direction on the side wall of the upper valve body 10-1; the bottom surface of the drain plug 10-3 and the top surface of the lower valve body 10-2 are respectively machined into conical surfaces that can fit together, and a double sealing ring is provided between the top outer wall of the drain plug 10-3 and the inner wall of the upper valve body 10-1; the top inner wall of the upper valve body 10-1 is provided with an internal thread for connecting to the closable single-flow valve 9, and the bottom outer wall of the lower valve body 10-2 is provided with an external thread for connecting to the third temperature and pressure testing device 11.

[0175] In this embodiment of the invention, the venting bypass valve 10, through the built-in venting blind plug 10-3, can permanently open the oil jacket channel by pressurizing to the fourth pressure after construction, so that water does not accumulate during the subsequent test string process.

[0176] In this embodiment of the invention, the first pressure, second pressure, third pressure, and fourth pressure can be set according to the pressure-bearing capacity of each component of the test string. For example, the first pressure is 16 MPa, the second pressure is 20 MPa, the third pressure is 30 MPa, and the fourth pressure is 35 MPa. Exemplarily, the specific process of this continuous tube fine-layer test string is as follows:

[0177] The process method for fine delamination testing of continuous tubes is as follows:

[0178] (1) Well preparation. The coiled tubing equipment is moved to the well site, and a scraper is used to scrape the entire section of the well to be tested to remove burrs and impurities from the inner wall of the well.

[0179] (2) Connect the tool string. According to the fine layer test string structure of the coiled tubing (from top to bottom along the wellbore): coiled tubing 1, connector 2, safety joint 3, first temperature and pressure test device 4, upper packer 5, second temperature and pressure test device 6, lower packer 7, spring stabilizer 8 and a closable check valve 9, venting bypass valve 10, third temperature and pressure test device 11, coupling positioner 12 and tailpipe 13, connect the tool string and lower it into the well.

[0180] (3) Insert tool string: The closed single-flow valve 9 is in the open state, and the liquid can pass through the flow hole 9-1-1 to push open the sealing ball 9-2-2 and enter the continuous tube 1 to balance the oil jacket pressure and prevent the continuous tube 1 from being crushed.

[0181] (4) Test string positioning. Use the coupling positioner 12 to pull upwards below the short casing position repeatedly to determine the short casing position. Based on the short casing position, determine the position of the test string in the wellbore to complete the mechanical positioning.

[0182] (5) Test string positioning. Based on the known position of the short casing inside the wellbore, the test string is positioned using the coupling locator 12. Once the positioning is clear, the test string is then positioned... Figure 1 Taking test layer 2 as an example, the test column is lowered into the test layer.

[0183] (6) Setting process: The ground pressure is increased to 16MPa through the inside of the continuous tube 1, and the pressure is transmitted to the upper packer 5, the lower packer 7, the spring stabilizer 8 and the closable check valve 9. Under the action of hydraulic pressure, the closable check valve 9 has the sealing ball 9-2-2 sitting on the ball seat 9-2, which closes the check valve, thus pressurizing the entire test string.

[0184] The upper packer 5 transmits hydraulic pressure simultaneously to the lower surface of the lower end of the first support sleeve 5-8 and the bottom end face of the first unlocking piston 5-12 through the rubber sleeve pressure transmission hole 5-1-1 and the slide valve pressure transmission hole 5-1-2, thereby achieving the expansion and deformation of the first rubber sleeve assembly 5-6 to seal the well barrel, unlocking the first locking block 5-15, and causing the slide valve 5-14 to move upward.

[0185] The lower packer 7 transmits hydraulic pressure simultaneously to the lower surface of the upper setting piston 7-11 and the bottom end face of the second unlocking piston 7-16 through the setting pressure transmission hole 7-1-1 and the seat pressure transmission hole 7-1-2, thereby achieving the expansion and deformation of the second rubber sleeve assembly 7-6 to seal the wellbore, the unlocking of the second locking block 7-17, and the upward movement of the seat support sleeve 7-14 and the sliding sleeve 7-15.

[0186] The spring centralizer 8 transmits hydraulic pressure simultaneously to the lower end face of the upper sliding sleeve 8-3 and the upper end face of the lower sliding sleeve 8-8 through the upper pressure hole 8-1-1 and the lower pressure hole 8-1-2. This forces the sliding sleeve to shear the sliding sleeve shear pin 8-9 and move it upward and downward respectively. This causes the upper limit sleeve 8-4 and the lower limit sleeve 8-7 to move upward and downward respectively to the second small step of the centralizer block 8-5. The centralizer block 8-5 loses the constraint of the limit sleeve and expands outward into the wellbore under the elastic force of the support spring 8-6, thus achieving the function of centralization.

[0187] As the sliding sleeve 8-8 moves downward, it closes the flow hole 9-1-1 on the valve body 9-1 of the closable check valve 9. At this time, the oil sleeve connection point (test channel) is limited to the relative movement of the slide valve 5-14, the first spindle 5-1, and the fixed sleeve 5-10 to open or close.

[0188] The pressure is further increased to 20 MPa. The slide valve 5-14 of the upper packer 5 moves upwards until it aligns with the test connection hole 5-14-3 and test hole 5-10-1, thus opening the test channel. The slips 7-9 of the lower packer 7 open and support the inner wall of the wellbore, ensuring the stability of the entire test string. The upper sliding sleeve 8-3 of the spring centralizer 8 moves upwards to the upper limit ring 8-2 and is locked by the limit spring 8-10, ceasing further movement. The lower sliding sleeve 8-8 moves downwards to the rubber ring sleeve 9-3, shears the sleeve shear pin 9-3-1, and continues downwards to the lower limit ring 8-9, where it is locked by the limit spring 8-10, ceasing further movement.

[0189] (7) Testing process: The upper and lower packers achieve a "double-seal single-card" effect, that is, the two packers lock the test layer 2, dividing it into three test spaces, such as... Figure 1 As shown, the third temperature and pressure testing device 11 behind the lower packer 7 monitors the temperature and pressure data of test layer 1. Normally, after testing test layer 1 is completed, it is dragged to test layer 2. Therefore, the fluid in test layer 1 was in a flowing state before being dragged to test layer 2. However, after being dragged to test layer 2, the fluid in test layer 1 cannot enter the interior of the continuous tube 1 and is in a non-flowing state, which is the closed state. Therefore, the temperature and pressure data of test layer 1 at this time are the well shut-in temperature and pressure recovery data.

[0190] The second temperature and pressure testing device 6, located between the upper packer 5 and the lower packer 7, tests the temperature and pressure data of the test layer 2. Because the slide valve 5-14 is open at this time, the fluid from the test layer 2 can enter the continuous tubing 1 through the test channel and be transported to the surface. Therefore, the temperature and pressure data of the test layer 2 are the wellbore flowing pressure and flowing temperature. The fluid production of the test layer 2 can be directly measured on the surface using metering equipment to obtain accurate production data.

[0191] The first temperature and pressure testing device 4, located in front of the packer 5, tests the temperature and pressure data of all layers from test layer 3 upwards. Because the slide valves 5-14 do not affect test layers 3 and above at this time, the fluid in these layers can be transferred to the surface through the annulus between the continuous pipe 1 and the wellbore. Therefore, the temperature and pressure data of all layers from test layer 3 and above are the wellbore flowing pressure and flowing temperature of the combined production of test layers 3 and above. The surface metering equipment can directly measure the combined production of test layers 3 and above.

[0192] (8) Unsealing process: After the test layer 2 is completed, unseal the upper packer 5, close the slide valve 5-14, and unseal the lower packer.

[0193] The entire test string is lifted through the continuous tube 1. The first lower connector 5-16 and the first limiting sleeve 5-17 at the bottom of the upper packer 5 move upward. The first limiting sleeve 5-16 drives the fixed sleeve 5-10 to move upward synchronously, so that the test slide valve mechanism is closed. The first upper connector 5-2 and the first upper connector connecting sleeve 5-3 move upward synchronously, losing their constraint on the first rubber sleeve assembly 5-6. The first rubber sleeve assembly 5-6 naturally retracts, losing its sealing effect on the wellbore. The first mandrel 5-1 moves upward synchronously. The whole assembly consisting of the supporting piston 5-11, the first unlocking piston 5-12, the first locking block 5-15 and the first piston support sleeve 5-13 remains stationary. When the first locking block 5-15 is exactly pressed inward into the multiple locking block embedded grooves opened on the outer wall of the first mandrel 5-1, the piston part of the test slide valve mechanism is locked on the first mandrel 5-1, restoring the upper packer 5 to its state before setting.

[0194] The second upper connector 7-2 and the second upper connector connecting sleeve 7-3 of the lower packer 7 move upward synchronously, losing their constraint on the second rubber sleeve assembly 7-6. The second rubber sleeve assembly 7-6 naturally retracts, losing its sealing effect on the wellbore. The second mandrel 7-1 moves upward along with the second upper connector 7-2 and the second upper connector connecting sleeve 7-3, bringing the second fixing plug 7-12 upward as well. This plug abuts against the lower end face of the upper setting piston 7-11, thereby driving the upper setting piston 7-11, the second support sleeve 7-8, and the second upper cone 7-7 upward, losing their constraint on the slips 7-9, causing the slips to... 7-9 leaves the wellbore; the second mandrel 7-1 drives the second limiting sleeve 7-19 and the second lower connector 7-20 to move upwards simultaneously, and the whole consisting of the seat piston 7-13, the second unlocking piston 7-16, the second locking block 7-17 and the second piston support sleeve 7-18 remains stationary. When the second locking block 7-17 just abuts against the multiple locking block grooves correspondingly opened on the outer wall of the second mandrel 7-1, the upper setting piston 7-11, the second fixing plug 7-12 and the seat piston 7-13 are locked on the second mandrel 7-1, restoring the lower packer 7 to its state before setting.

[0195] After the slide valve 5-14 is closed and the upper and lower packers are released, continue to lift the continuous tube 1 and drag the entire test string to the next test layer, i.e., test layer 3. Repeat the above steps to complete the test operation of test layer 3.

[0196] (9) Test string removal process: After all layers of testing are completed, slide valve 5-14 is closed and the upper and lower packers are released. The pressure inside the continuous tubing 1 is increased to 30MPa. The ball seat 9-2 in the closed-loop valve 9 cuts the ball seat shear pin 9-2-1 and descends to the upper surface of the venting blind plug 10-3 in the venting bypass valve 10. The pressure is further increased to 35MPa. The venting blind plug 10-3 cuts the venting shear pin 10-4, allowing the venting blind plug 10-3 to descend to the top surface of the lower valve body 10-2. The wellbore is then connected to the inside of the continuous tubing 1 through the bypass hole 10-5, ensuring that no water accumulates inside the tubing during the test string removal process. After the pressure inside the continuous tubing 1 is increased to 35MPa and then suddenly depressurized, it indicates that the venting blind plug 10-3 has been removed. The test string is then removed at a constant speed.

[0197] It should be noted that during the entire test, the pressure inside the continuous tube must not exceed the fourth pressure, i.e., 35MPa. Otherwise, the venting and blind plug 10-3 will prematurely cut off the venting and blind plug 10-4, forming other channels besides the test channel, making it impossible to complete the test.

[0198] (10) Data reading and interpretation process: After the entire test string is removed, the corresponding thermometers are taken out from the first temperature and pressure test device 4, the second temperature and pressure test device 6 and the third temperature and pressure test device 11. The temperature and pressure data of the corresponding layer are read on the computer, the production data measured in the ground metering equipment is obtained, the temperature, pressure and production curves are plotted, and the fracturing effect of each layer is evaluated.

[0199] Based on the same inventive concept, embodiments of the present invention also provide a testing method for a test string of finely layered continuous tubes, comprising:

[0200] The test string with finely layered continuous tubing is lowered into the test layer. During the lowering process, a closed-loop valve is connected to the annulus to allow the liquid in the annulus to be introduced into the continuous tubing.

[0201] By pressurizing the continuous pipe from the ground and maintaining the first pressure, the closed-loop valve cuts off the connection between the pipe and the annulus, sets the upper and lower packers, and continues to pressurize and maintain the second pressure to make the upper packer connected to the annulus.

[0202] The temperature and pressure at the corresponding locations are detected by the first temperature and pressure testing device, the second temperature and pressure testing device, and the third temperature and pressure testing device, respectively.

[0203] After the test is completed, the continuous tube is lifted to release the upper packer and the lower packer, and after lifting and releasing, the upper packer disconnects from the annulus; the first pressure is less than the second pressure;

[0204] Repeat the above testing process until all test layers have been tested, then remove the test string.

[0205] The specific implementation process of the test method for the test string of fine stratification of continuous tubes provided in this embodiment of the invention can be referred to the above detailed description of the test string of fine stratification of continuous tubes. Where the description is repeated, it will not be repeated here.

[0206] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. The terms "upper," "lower," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0207] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. This invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and / or substitution of these aspects and / or embodiments. Each aspect and / or embodiment of this invention can be used alone, or in combination with one or more other aspects and / or other embodiments.

[0208] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A test string for finely layered continuous tubes, characterized in that, include: The continuous tube, first temperature and pressure testing device, upper packer, second temperature and pressure testing device, lower packer, closable check valve and third temperature and pressure testing device are connected in sequence from top to bottom. The first temperature and pressure testing device, the second temperature and pressure testing device, and the third temperature and pressure testing device are respectively used to detect the temperature and pressure at the corresponding locations; The upper and lower packers are used for setting the coil under pressure and maintaining a first pressure; the upper packer is also used for communicating with the annulus of the oil sleeve under pressure and maintaining a second pressure. The upper packer and the lower packer are used to be able to be lifted and unsealed through the continuous tube in the set state, and after being lifted and unsealed, the upper packer can cut off the communication with the annulus. The closable single-flow valve is used to communicate with the annulus during the process of running the test tubing into the wellbore, so as to allow the fluid in the annulus to flow into the coiled tubing, and is also used to cut off the communication with the annulus under the action of pressurizing the coiled tubing and maintaining the first pressure; wherein the first pressure is less than the second pressure.

2. The test string as described in claim 1, characterized in that, The upper packer includes: a first spindle, a fixed sleeve, multiple first locking blocks, a first upper connector assembly, a rubber sleeve sealing mechanism, a first fixed plug, a support piston, a first unlocking piston, a first piston support sleeve, a slide valve, a first lower connector, and a first limiting sleeve, which are sequentially sleeved on the outside of the first spindle from top to bottom. The first limiting sleeve is connected to the outer wall of the first lower connector; The lower sidewall of the first mandrel is provided with multiple rubber tube pressure transmission holes and multiple slide valve pressure transmission holes axially from top to bottom; The fixed sleeve has multiple test holes along the circumference, the slide valve has multiple test communication holes, and the side wall of the first lower connector has multiple center communication holes. The first fixing plug is fixed to the first mandrel. An annular groove communicating with the pressure transmission hole of the rubber tube is provided on the inner wall of the first fixing plug, or there is a gap between the first fixing plug and the first mandrel communicating with the pressure transmission hole of the rubber tube. The upper end of the fixed sleeve abuts against the rubber sleeve sealing mechanism, and the lower end of the fixed sleeve abuts against the upper surface of the first limiting sleeve; The supporting piston, the first fixed plug, the first spindle and the fixed sleeve form a first annular space, and the first unlocking piston is located between the supporting piston and the first piston support sleeve. The bottom end of the support piston is provided with a plurality of radial through holes, and the outer wall of the first spindle is provided with a plurality of locking block inlay grooves. The plurality of first locking blocks are correspondingly arranged in the plurality of radial through holes and abut against the locking block inlay grooves. The first unlocking piston is sleeved on the outside of the first locking block, and there is a gap between the first piston support sleeve and the support piston that connects to the slide valve pressure transmission hole.

3. The test string as described in claim 2, characterized in that, The rubber sleeve sealing mechanism includes: a first rubber sleeve gasket, a first rubber sleeve support, a first rubber sleeve assembly, a first upper cone, and a first support sleeve; The first rubber sleeve gasket rests against the bottom end of the first upper connector assembly; The first support sleeve is slidably sealed to the first spindle, and the first upper cone is connected to the first support sleeve; The upper end of the fixing sleeve abuts against the outer conical surface of the first upper cone, and the lower end of the fixing sleeve abuts against the upper surface of the first limiting sleeve.

4. The test string as described in claim 3, characterized in that, The first upper connector assembly includes a first upper connector and a first upper connector connecting sleeve; The first upper connector is connected to the top end of the first mandrel; The top end of the first upper connector sleeve is connected to the outer wall of the bottom end of the first upper connector; The first rubber sleeve gasket rests against the bottom end of the first upper connector connecting sleeve.

5. The test string as described in claim 1, characterized in that, The lower packer includes: a second spindle, a seat support sleeve, multiple second locking blocks, a sliding sleeve, a second unlocking piston, a second piston support sleeve, an upper connecting mechanism, a setting assembly, a slip assembly, an upper setting piston, a second fixing plug, a seat piston, and a lower connecting mechanism, which are sequentially sleeved on the outside of the second spindle from top to bottom. The lower sidewall of the second mandrel is provided with multiple seat pressure transmission holes and multiple seat pressure transmission holes along the axial direction from top to bottom; The second fixing plug is fixed to the second mandrel. An annular groove communicating with the setting pressure transmission hole is provided on the inner wall of the second fixing plug, or there is a gap between the second fixing plug and the second mandrel communicating with the setting pressure transmission hole. The upper end of the seat support sleeve is supported at the bottom end of the slip assembly, the top of the seat piston is sleeved on the lower end of the seat support sleeve, and the seat piston, the second fixed plug, the second mandrel and the seat support sleeve form a second annular space. The sliding sleeve is connected to the outer side of the seat piston, and the second unlocking piston is located between the seat piston and the second piston support sleeve; The bottom end of the seat piston is provided with multiple radial through holes, and the outer wall of the second spindle is provided with multiple locking block inlay grooves. The multiple second locking blocks are correspondingly arranged in the multiple radial through holes and abut against the locking block inlay grooves. The second unlocking piston is sleeved on the outside of the second locking block, and there is a gap between the second piston support sleeve and the seat piston that connects to the seat pressure transmission hole.

6. The test string as described in claim 5, characterized in that, The setting assembly includes, from top to bottom, a second rubber sleeve gasket, a second rubber sleeve support, a second rubber sleeve assembly, a second upper cone, and a second support sleeve, which are sequentially sleeved on the side of the second mandrel. The upper end of the slip assembly abuts against the outer conical surface of the second upper cone, the second support sleeve slides and seals with the second spindle, and the second rubber sleeve gasket abuts against the bottom end of the second upper connector assembly; The second upper cone is connected to the second support sleeve.

7. The test string as described in claim 6, characterized in that, The slip assembly includes slips and slip bases; The slip and slip seat are sequentially fitted onto the outside of the second support sleeve from top to bottom; The upper inner wall of the slip has a conical surface that mates with the outer wall of the second upper cone and abuts against the outer conical surface of the second upper cone; The locking seat is fixed to the bottom end of the second support sleeve.

8. The test string as described in claim 5, characterized in that, The lower connecting mechanism includes a second limiting sleeve and a second lower connector; The top end of the second lower connector is connected to the bottom end of the second mandrel; The sliding sleeve is fitted onto the outside of the second lower connector, and a seal is formed between the outer wall of the top end of the second lower connector and the sliding sleeve. The top end of the sliding sleeve abuts against the lower end face of the seat piston and is connected to the seat piston; The second limiting sleeve is connected to the outer wall of the second lower connector, and the bottom end of the sliding sleeve abuts against the second limiting sleeve.

9. The test string as described in claim 1, characterized in that, The first temperature and pressure testing device includes: a first support body, a first support inner core, and a first temperature and pressure gauge; The first inner core of the support tube is disposed on the inner wall of the first support tube body, and the first thermo-barometer is disposed in the first inner core of the support tube; A first annular channel for flow is formed within the first support cylinder body; The first support tube body is provided with a first connecting hole, which connects to the inner core of the first support tube.

10. The test string as described in claim 1, characterized in that, The second temperature and pressure testing device includes: a second support body, a second support inner core, and a second temperature and pressure gauge; The second support cylinder inner core is connected to the second support cylinder body by a support connecting rod, and the second thermo-barometer is disposed in the second support cylinder inner core; A second annular channel for flow passage is formed between the second support body and the second support inner core; The inner core of the second support tube is provided with a second connecting hole, which connects to the second annular channel.

11. The test string as described in claim 1, characterized in that, It also includes a spring-loaded straightener; the spring-loaded straightener includes a central shaft and an upper limit ring, an upper sliding sleeve, an upper limit sleeve, multiple straightener blocks, a support spring, a lower limit sleeve, a lower sliding sleeve, and a lower limit ring sleeved on the central shaft; The upper sliding sleeve and the lower sliding sleeve are respectively fixed to the central shaft by sliding sleeve shear pins, and limit snap rings are respectively provided between the upper sliding sleeve and the lower sliding sleeve and the central shaft; The plurality of straightening blocks are aligned and fitted onto the central axis; The upper and lower ends of the straightening block are respectively narrowed to form two steps, and are supported by support springs; The upper limit sleeve and the lower limit sleeve are respectively fitted onto the first step at the upper and lower ends of the straightening block; The central shaft has an upper step and a lower step. An upper pressure hole is radially provided on the upper part of the upper step, located below the upper sliding sleeve, and a lower pressure hole is radially provided on the lower part of the lower step, located above the lower sliding sleeve.

12. The test string as described in claim 11, characterized in that, The closable single-flow valve includes a valve body, a rubber ring sleeve, and a ball seat built into the valve body; The valve body is integrally formed with the central shaft, the lower limiting ring is sleeved on the valve body, and a limiting snap ring is provided between the lower sliding sleeve and the valve body; Multiple flow holes are provided circumferentially on the side wall of the valve body; The ball seat is located above the flow hole and is fixed to the valve body by ball seat shear pins arranged circumferentially. The ball seat contains a sealing ball, and multiple ball-blocking pins are inserted circumferentially on the side wall of the valve body located above the ball seat. The rubber ring sleeve is fitted onto the outside of the valve body; The bottom end of the sliding sleeve is located above the flow hole; The rubber ring sleeve is disposed below the flow hole and is fixed to the valve body by sleeve shear pins arranged circumferentially. The lower limiting ring and the rubber ring sheath are spaced apart; The flow passage is used to communicate with the annulus during the process of the test string being lowered into the wellbore, so as to push the plugging ball away from the ball seat and allow the liquid in the annulus to flow into the continuous tubing; The blocking ball is used to sit on the ball seat under the first pressure to close the flow channel; The sliding sleeve is specifically used to cut off the sliding sleeve shear pin under the first pressure, close the flow hole downwards, and move down to the rubber ring sleeve under the second pressure, cut off the sleeve shear pin, and continue to move down to the lower limit ring, where it is locked by the limit spring.

13. The test string as described in claim 12, characterized in that, With the upper and lower packers unsealed, the sealing ball is also used to sit on the ball seat under a third pressure, pressing and shearing the ball seat pins.

14. The test string as described in claim 12, characterized in that, It also includes a venting bypass valve; The venting bypass valve is connected between the closable single-flow valve and the third temperature and pressure testing device. The venting bypass valve is used to block the test string and connects to the annulus when the continuous tubing is pressurized to the fourth pressure.

15. The test string as described in claim 14, characterized in that, The venting bypass valve includes an upper valve body, a lower valve body, and a venting blind plug; The upper valve body is connected to the closable single-flow valve; The lower valve body is connected to the third temperature and pressure testing device; The venting plug has a blind hole extending axially upwards from the bottom surface; The venting blind plug is fixed to the upper valve body by venting shear pins arranged circumferentially. The blind plug is sealed to the upper valve body; Multiple bypass holes are provided circumferentially on the side wall of the upper valve body at a position below the venting blind plug. When the upper and lower packers are unsealed, the venting blind plug can shear off the venting shear pin under the action of the fourth pressure, allowing the venting blind plug to descend to the top surface of the lower valve body, so that the bypass hole can connect with the oil jacket ring control.

16. A test method for fine stratification of a continuous tube, characterized in that, include: The test string with finely layered continuous tubing is lowered into the test layer. During the lowering process, a closed-loop valve is connected to the annulus to allow the liquid in the annulus to be introduced into the continuous tubing. By pressurizing the continuous pipe from the ground and maintaining the first pressure, the closed-loop valve cuts off the connection between the pipe and the annulus, sets the upper and lower packers, and continues to pressurize and maintain the second pressure to make the upper packer connected to the annulus. The temperature and pressure at corresponding locations are detected by the first temperature and pressure testing device, the second temperature and pressure testing device and the third temperature and pressure testing device, respectively, to carry out the testing process; After the test is completed, the continuous tube is lifted to release the upper packer and the lower packer, and after lifting and releasing, the upper packer disconnects from the annulus; the first pressure is less than the second pressure; Repeat the above testing process until all test layers have been tested, then remove the test string.

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