Horizontal well tracing water exploration testing tubular column, using method and special testing device

Abstract

The invention discloses a horizontal well tracing water exploration testing tubular column, a using method and a special testing device, and belongs to the technical field of oilfield development, the horizontal well tracing water exploration testing tubular column comprises an interlayer packer arranged on an oil pipe, and further comprises at least one tracing monitoring and water plugging device arranged on the oil pipe, each tracing monitoring and water plugging device corresponds to one oil-water layer, a releasing suspension packer is further arranged at the uppermost end of the oil pipe, and when the multiple tracing monitoring and water plugging devices are arranged, an interlayer packer is arranged between every two tracing monitoring and water plugging devices. Segmented tracing water exploration is carried out on the horizontal section reservoir through the tracing water exploration tubular column, a water outlet layer is determined, segmented sealing and water control oil extraction of a plurality of water control sections are achieved by tripping in a plurality of tracing monitoring and water plugging units, and the water exploration and water control efficiency of the horizontal section reservoir of the horizontal well is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil exploitation, and particularly to a horizontal well tracer water finding test string, its usage method and a special test device. Background Art

[0002] As an efficient development technology for new area production capacity construction and old area comprehensive adjustment, horizontal wells are of great significance in aspects such as expanding the recoverable reserves, improving the development effect, and enhancing the overall development effect. With the gradual improvement of the horizontal well completion drilling technology in Shengli Oilfield, horizontal wells have entered the large-scale application stage.

[0003] Due to the influence of factors such as reservoir lithology and injection-production well pattern, there are differences in liquid production, pressure, etc. in each section of the horizontal well. During the development process, problems such as short water-free oil production period in well sections and fast water cut rising speed directly affect the effective development of horizontal wells. Therefore, it is very necessary to strengthen the water finding logging of horizontal wells, accurately measure the liquid production and water cut data of each layer section of horizontal wells, and provide technical support for the implementation of production enhancement measures such as water plugging and water control in horizontal wells.

[0004] Whether the water plugging and water control measures for horizontal wells can succeed largely depends on the identification of the water-producing section. At present, the horizontal well water finding logging technologies used in Shengli Oilfield mainly include conventional horizontal well water finding logging technologies such as boron neutron water finding, well temperature water finding, and liquid production profile water finding. The conventional horizontal well water finding test technologies have the following problems: First, the operation is complex, and the string needs to be pulled out for testing; second, the test cost is high, and the logging instrument needs to be equipped with conveying tools such as crawlers and coiled tubing; third, the safety risk is high, the well condition in the horizontal section is complex, the instrument is easy to get stuck or blocked, and it is difficult to fish out after falling into the well; fourth, long-term testing cannot be achieved.

[0005] Publication (Announcement) No.: CN 111810114 A, Publication (Announcement) Date: October 23, 2020. A tracer water finding and sectional water control system and method, which includes a tracer water finding string and a sectional water control string arranged in the tracer water finding string. The tracer water finding string includes a plurality of expansion packers for separating the reservoir of the horizontal well into a plurality of water control sections and a tracer screen for obtaining the oil-water information of each water control section. Adjacent expansion packers are connected by the tracer screen. The sectional water control string includes a plurality of isolation and sealing short joints for segmentally sealing the plurality of water control sections to form a plurality of sealed sections and a water control valve short joint for controlling water production and oil production in the sealed sections. Adjacent isolation and sealing short joints are connected by the water control valve short joint. The reservoir is segmented and traced for water finding through the tracer water finding string to determine the water-producing layer, and the plurality of water control sections are segmentally sealed and water production and oil production are controlled through the sectional water control string lowered into the tracer water finding string.

[0006] Publication (Announcement) Number: CN 114482908 A, Publication (Announcement) Date: May 13, 2022 Multi-stage one-trip string water finding string and usage method, which includes an upper joint, a packer, a setting mechanism, a setting pin, a central pipe, a fluid flow conversion device, and a fluid flow conversion channel; the upper joint, the packer, the setting mechanism, the setting pin, and the central pipe are connected in sequence from top to bottom; the conversion fluid channel is connected to the bottom of the central pipe; the fluid flow conversion device is provided with a one-way flow valve, a sliding sleeve, and a backwashing channel closing pin in sequence from top to bottom; the above structure is a structural unit, and according to actual needs, the string can include multiple structural units.

[0007] Publication (Announcement) Number: CN 111810114 A, Publication (Announcement) Date: October 23, 2020 A tracer water finding and sectional water control system and method. The tracer water finding and sectional water control system includes a tracer water finding string and a sectional water control string arranged inside the tracer water finding string. The tracer water finding string includes multiple expansion packers for separating the reservoir of a horizontal well into multiple water control sections and a tracer screen pipe for obtaining the oil-water information of each water control section. Adjacent expansion packers are connected through the tracer screen pipe. The sectional water control string includes multiple isolation sealing short joints for sealing the multiple water control sections separately to form multiple sealed sections and a water control valve short joint for water control and oil production in the sealed sections. Adjacent isolation sealing short joints are connected through the water control valve short joint. In the actual application process of this method, there are problems such as low accuracy in water finding and water control and low efficiency. Therefore, a horizontal well tracer water finding test method is needed to solve the above problems.

[0008] In the embodiment of the present invention, the horizontal section reservoir is subjected to sectional tracer water finding through the tracer water finding string to determine the water-producing layer, and the sectional water control string lowered into the tracer water finding string is used to separately seal and control water and oil production in multiple water control sections, improving the water finding and water control efficiency of the horizontal section reservoir of the horizontal well. The above prior art cannot achieve the technical effect of the present invention. Summary of the Invention

[0009] The purpose of the present invention is to provide a horizontal well tracer water finding test string, usage method and special test device in view of the above defects existing in the existing test technology, which can be used as a powerful tool for long-term monitoring of the water-producing position of horizontal wells, and at the same time can plug water for the water-producing layer section without pulling the string.

[0010] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0011] A horizontal well tracer water finding test string includes an interlayer packer arranged on the tubing, and also includes a tracer monitoring and water plugging device. The tracer monitoring and water plugging device is arranged on the tubing. At least one tracer monitoring and water plugging device is provided, and each tracer monitoring and water plugging device corresponds to an oil-water layer.

[0012] The uppermost end of the oil pipe is also provided with a drop-hanging packer. When there are multiple tracer monitoring and water plugging devices, interlayer packers are provided between each of the tracer monitoring and water plugging devices.

[0013] The packers are all provided with a step-locking mechanism, a straightening mechanism and a safety release mechanism, and the interlayer packers are also provided with a resistance mechanism.

[0014] The step-locking mechanism includes a locking sleeve and a first locking spring corresponding thereto, and a locking sleeve and a second locking spring corresponding thereto. The straightening mechanism includes an upper cone, a connecting slip, a lower cone, a straightening sleeve and a straightening block, ensuring that the first connecting rubber cylinder and the second connecting rubber cylinder are centered and sealed. The safety disengagement mechanism includes a shear pin release and an unsealing shear pin, and the resistance mechanism is a protective shear pin.

[0015] The release suspension packer is provided with the first upper joint, the upper center pipe, the lower center pipe and the sliding sleeve on the inner shell from left to right in sequence. The upper center pipe is covered with a fish top, a locking sleeve and a cylinder in sequence on the outside. The locking sleeve is provided with a first locking spring for locking the cylinder. The right end of the upper center pipe is also covered with an unsealing sleeve. A first secondary piston is provided between the unsealing sleeve and the cylinder body. The lower center pipe is covered with the first rubber cylinder shaft, the upper cone, the connecting slip and the lower cone in sequence from left to right on the outside. The first rubber cylinder shaft is covered with the first upper pressure ring, the first connecting rubber cylinder and the first lower pressure ring in sequence from left to right. The connecting slip is covered with a slip cover. The sliding sleeve is provided with a release shear nail and a lower joint.

[0016] The self-righting packer is provided with a second upper joint, a righting block, a second upper pressure ring, a second rubber cylinder shaft, an upper cylinder sleeve and a lower cylinder sleeve on the inner shell from left to right. The second upper joint is covered with a back cap and a righting sleeve on the outside, the second rubber cylinder shaft is covered with a second connecting rubber cylinder on the outside, a second lower pressure ring is provided between the second rubber cylinder shaft and the upper cylinder sleeve, a floating piston is provided in the upper cylinder sleeve, and a protective shear pin, a second auxiliary piston, a limit sleeve and a locking sleeve are provided in the lower cylinder sleeve from left to right. A second locking spring is provided at the right end of the lower cylinder sleeve, and an unsealing shear pin is provided at the right end of the locking sleeve.

[0017] The tracer monitoring and water plugging device includes a control circuit, a valve assembly, a tracer short-circuit device, a one-way valve and upper and lower stratum fluid channels arranged in sequence on the right side of the control circuit. The control circuit is arranged in the oil pipe, and a pressure-conducting hole is also arranged at the bottom of the control circuit. A bridge body is arranged outside the tracer short-circuit device, and a stratum fluid channel assembly is arranged at the right end of the bridge body. The valve assembly consists of a battery, a motor and a switch valve, and the switch valve is controlled by the control circuit.

[0018] The tracer jumper device includes an intelligent switch and a casing. The intelligent switch is installed at the left end of the casing through a second adapter and is connected thereto. The right side of the casing is connected to a first adapter on the oil pipe through a second adapter. Two mesh plates are provided in the middle of the casing, and the mesh plates are connected to the inner wall of the casing through fixing screws. The intelligent switch is designed as an integrated bridge structure and includes a microprocessor.

[0019] The tracer jumper device adopts a design with fluid passing through. The tracer strips are formed into a rectangular shape and evenly distributed in the tracer jumper device. There are two types of tracer strips, both made of trace elements. One is water-soluble and the other is oil-soluble.

[0020] When the intelligent switch is in a predetermined program running state, the intelligent switch switches on and off regularly according to the predetermined program and automatically without ground intervention. When the intelligent switch is in the closed state, the fluid cannot enter the oil pipe; when the intelligent switch is in the open state, the formation fluid channel assembly is in a flowing state, and the on-off of the flow channel is controlled by a switch valve. The formation fluid enters the intelligent switch through the bridge body, flows out of the liquid outlet hole of the intelligent switch and into the oil pipe to be produced. Each layer is produced in turn regularly according to the time sequence. The formation fluid carries out the tracer, and through ground monitoring and measurement, the production characteristics of each layer are determined.

[0021] When the intelligent switch is in a ground command remote control state, ground pressure control technology is used. The ground pressure control technology refers to the use of pressure positive pulse signal transmission technology for intelligent layered production of oil wells. By means of pressurizing - depressurizing - pressurizing in the wellhead annulus, a specific pressure wave command signal is generated. By encoding the command, each command contains formation and action information. This signal is transmitted to the downhole through the wellbore, so that the intelligent switch opens or closes the formation as required to achieve water plugging or layer adjustment.

[0022] During ground remote control layer adjustment, a pump truck generates a water pressure pulse wave in the oil casing annulus on the ground according to a specific format to control the opening or closing action of the downhole intelligent switch, realizing ground remote control of the downhole and achieving the purpose of arbitrarily selecting layers for production.

[0023] To achieve the above object, the present invention adopts the following technical solutions:

[0024] A method for using a horizontal well tracer water finding test string includes the following steps:

[0025] a. According to the requirements of the construction design, connect the pipe string to the well with the oil pipe and lower it to the designed position, and the packer is set.

[0026] b. When releasing, lift the pipe string to release the delivery tool for the plugging process pipe string.

[0027] c. When probing the bottom, after the sending and setting tool is released, lift the tubing string, then slowly lower the tubing string until the tool is reached. If the position remains unchanged, it indicates that the tool is set reliably. Then, retrieve the sending and setting tool.

[0028] d. When pumping and producing, lower the production tubing string and the pump according to the production parameter requirements for production oil recovery.

[0029] e. When sampling and testing, conduct sampling and sample analysis work according to the requirements of the plan design until the end of the test for the liquid-producing interval.

[0030] f. When fishing, after the test is completed and the test tubing string needs to be retrieved, connect the special fishing tool with the tubing and lower it into the well to collide with the fish head. The fishing claws will latch onto the fish head, and lifting can release the seal. It is necessary to repeat the lifting and lowering actions several times to loosen the accumulated sand for a complete release. When the tool is buried by sand, it is necessary to fish while flushing until it is retrieved.

[0031] To achieve the above object, the present invention adopts the following technical solutions:

[0032] A special test device for a horizontal well tracer water-finding test tubing string, including a tracer monitoring and water plugging device. The tracer monitoring and water plugging device includes a formation fluid channel assembly, and also includes a bridge body connected to the left end of the formation fluid channel assembly. A check valve connected to the left end of the formation fluid channel assembly is arranged inside the bridge body. A tracer short joint device is connected to the left end of the check valve, and a valve assembly is arranged at the left end of the tracer short joint device.

[0033] The tracer short joint device is designed with a liquid passing through it. The tracer short joint device includes an intelligent switch, a casing, and a first tubing 48a. The intelligent switch is connected to the left end of the casing, and the right end of the casing is connected to the first tubing 48a, so that the casing is located inside the first tubing 48a. The intelligent switch contains a microprocessor, and the intelligent switch has two working modes: a predetermined program and ground remote control. Tracer strips are evenly arranged inside the casing. There are two types of tracer strips, both made of trace elements, one is water-soluble and the other is oil-soluble.

[0034] The present invention has the following beneficial effects compared with the prior art:

[0035] 1. In the present invention, the tracer has good compatibility with formation water, low adsorption amount, high temperature and high salt resistance (200°C, 200,000 mg / L), acid and alkali resistance (pH 1 - 12); the release rate of the tracer system is independent of the fluid flow rate, and it can maintain monitoring for a long time; the test accuracy is high (10 - 14 kg / L);

[0036] 2. In the present invention, the tracer is installed in a special nipple with the same inner diameter. The number of tracers installed in each nipple is the same. The dissolution rate of the tracer is only related to the amount of water flowing through. The main water-producing layer is determined by the content of the tracer in the produced fluid.

[0037] 3. In the present invention, a double insurance for water finding is achieved. On the one hand, the tracer can accurately identify the water layer, and on the other hand, the intelligent switch for layered wheel production can accurately find the main water-producing layer, which can not only verify each other but also achieve a double insurance for water finding to ensure the success rate of water finding.

[0038] 4. In the present invention, combined production and layered wheel production can be realized, with a relatively high degree of automation and good adaptability. After finding water, the main water-producing layer can be closed and the main oil-producing layer can be produced.

[0039] 5. In the present invention, the water production contribution rate of each section during the combined production of a horizontal well completed by multi-stage perforation can be accurately measured, providing technical support for the implementation of production enhancement measures such as water plugging and profile control for high water cut horizontal wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is the overall structural schematic diagram of a horizontal well tracer water finding test string, its using method and a special test device of the present invention;

[0041] Figure 2 is the structural schematic diagram of the releasing and hanging packer of the present invention;

[0042] Figure 3 is the structural schematic diagram of the self-centering packer of the present invention;

[0043] Figure 4 is the structural schematic diagram of the tracer monitoring and water plugging device of a horizontal well tracer water finding test string, its using method and a special test device of the present invention;

[0044] Figure 5 is the structural schematic diagram of the tracer nipple device of the present invention;

[0045] Figure 6 is the detection schematic diagram of the tracer nipple of the present invention;

[0046] Figure 7 is the signal transmission curve diagram of the tracer nipple of the present invention;

[0047] Figure 8 is the completion string schematic diagram of the present invention;

[0048] Figure 9 is the well deviation basic data table of the SP1 oil layer section of the present invention;

[0049] Figure 10 is the tracer water finding effect tracking schematic diagram of the SP1 of the present invention;

[0050] Figure 11 This is the concentration curve diagram of the SP1 tracer of the present invention;

[0051] Figure 12 This is the flowing fluid level curve diagram of the SP1 of the present invention;

[0052] Figure 13 This is the comprehensive water cut curve diagram of the SP1 of the present invention;

[0053] Figure 14 This is the bar chart of the water production ratio in each stage of the SP1 of the present invention;

[0054] Figure 15 This is the pie chart of the water production ratio in each stage of the SP1 of the present invention;

[0055] In the figure: 1. First upper joint; 2. Fish head; 3. Upper central tube; 4. First lock spring; 5. Locking sleeve; 6. Cylinder barrel; 7. Unsealing sleeve; 8. First auxiliary piston; 9. First upper pressure ring; 10. First rubber cylinder shaft; 11. Lower central tube; 12. First connecting rubber cylinder; 13. First lower pressure ring; 14. Upper cone; 15. Slip joint cover; 16. Connecting slip joint; 17. Lower cone; 18. Slide sleeve; 19. Release shear pin; 20. Lower joint; 21. Second upper joint; 22. Back cap; 23. Centralizing sleeve; 24. Centralizing block; 25. Second upper pressure ring; 26. Second connecting rubber cylinder; 27. Second rubber cylinder shaft; 28. Second lower pressure ring; 29. Floating piston; 30. Upper cylinder sleeve; 31. Lower cylinder sleeve; 32. Protection shear pin; 33. Second auxiliary piston; 34. Limiting sleeve; 35. Locking sleeve; 36. Second lock spring; 37. Unsealing shear pin; 38. Control circuit; 39. Battery; 40. Motor; 41. Switch valve; 42. Tracer short-circuit device; 43. Check valve; 44. Upper and lower formation fluid channels; 45. Formation fluid channel assembly; 46. Bridge body; 47. Pressure guiding hole; 48. Oil pipe; 48a. First oil pipe; 49. Intelligent switch; 50. First adapter; 51. Second adapter; 52. Mesh plate; 53. Fixing screw; 54. Casing; 100. Oil production pump; 101. Release and hanging packer; 102. First tracer monitoring device; 103. First interlayer packer; 104. Second tracer monitoring device; 105. Second interlayer packer; 106. Third tracer detection device. Detailed implementation manners

[0056] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0057] Refer to Figures 1 - 15The present invention provides a horizontal well tracer water-finding test string and a method of use and a special test device, including an interlayer packer arranged on the oil pipe 48, and also including a tracer monitoring and water plugging device, the tracer monitoring and water plugging device is arranged on the oil pipe 48, at least one tracer monitoring and water plugging device is arranged, and each tracer monitoring and water plugging device corresponds to an oil-water layer.

[0058] The uppermost end of the oil pipe 48 is also provided with a drop-hanging packer. When there are multiple tracer monitoring and water plugging devices, interlayer packers are provided between the tracer monitoring and water plugging devices.

[0059] The packer is provided with a step-by-step locking mechanism, which includes a locking sleeve 5 and a first locking spring 4 corresponding thereto, as well as a locking sleeve 35 and a second locking spring 36 corresponding thereto. The locking is completed during the setting process, and the packer is unsealed in stages during the unsealing process. After the outer packer is unsealed, the upward pulling force is transmitted to the next packer.

[0060] The packer is provided with a righting mechanism, which includes an upper cone 14, a connecting slip 16, a lower cone 17, a righting sleeve 23 and a righting block 24, to ensure that the first connecting rubber tube 12 and the second connecting rubber tube 26 are centered and sealed.

[0061] The packer is also provided with a safety release mechanism, which includes a shear pin 19 for throwing away and a shear pin 37 for releasing. When the packer is buried by sand and cannot be lifted, the safety release mechanism can be opened to perform secondary sand flushing and reprocessing of the packer.

[0062] The self-righting packer is provided with a resistance mechanism to protect the shear pins 32, so that the packer will not be set if it encounters resistance during the downhole process. It is also provided with a floating piston 29 to reduce the unsealing pulling force of the downhole tool.

[0063] The first upper joint 1, the upper center pipe 3, the lower center pipe 11, and the sliding sleeve 18 are sequentially arranged on the inner shell from left to right. The upper center pipe 3 is covered with a fish top 2, a locking sleeve 5 and a cylinder 6 in sequence. The locking sleeve 5 is provided with a first locking spring 4 for locking the cylinder 6. The right end of the upper center pipe 3 is also covered with an unsealing sleeve 7. A first secondary piston 8 is arranged between the unsealing sleeve 7 and the cylinder 6. The first rubber cylinder shaft 10, the upper cone 14, the connecting slip 16 and the lower cone 17 are sequentially covered on the outer side of the lower center pipe 11 from left to right. The first rubber cylinder shaft 10 is sequentially covered with a first upper pressure ring 9, a first connecting rubber cylinder 12 and a first lower pressure ring 13 from left to right. The connecting slip 16 is covered with a slip cover 15. The sliding sleeve 18 is provided with a throw-away shear nail 19 and a lower joint 20.

[0064] The implementation steps of the drop-hanging packer are as follows:

[0065] When setting the seal, the oil pipe 48 is pressurized, and the hydraulic pressure pushes the first auxiliary piston 8 to move to the left. The first upper pressure ring 9 moves to the right under the action of the hydraulic pressure, pushing the upper cone 14 to move to the right, and the connecting slip 16 expands outward and anchors with the sleeve. At the same time, the first connecting rubber cylinder 12 is compressed and expanded outward under the action of the axial force to seal with the sleeve. After the anchoring and sealing are completed, the first locking spring 4 and the first locking sleeve 5 simultaneously complete the step-by-step locking, and the tool is set. When releasing, the oil pipe 48 is lifted to separate the first upper joint 1 from the fish top 2 and the downhole tool, and the release operation is completed. When unsealing, a special salvage tool is lowered to grab the fish top 2, and the pipe string unsealing tool is lifted. If the unsealing force exceeds the unsealing load by a lot and cannot be unsealed normally, the pipe string below the upper seal may be buried in sand. The special tool is lowered to push the sliding sleeve 18 downward to disengage the lower joint 20 from the lower cone 17. The release suspension packer can be raised, and the sand is washed to salvage the lower joint 20.

[0066] The self-righting packer is provided with a second upper joint 21, a righting block 24, a second upper pressure ring 25, a second rubber cylinder shaft 27, an upper cylinder sleeve 30 and a lower cylinder sleeve 31 on the inner shell from left to right. The second upper joint 21 is covered with a back cap 22 and a righting sleeve 23 on the outside, the second rubber cylinder shaft 27 is covered with a second connecting rubber cylinder 26 on the outside, a second lower pressure ring 28 is provided between the second rubber cylinder shaft 27 and the upper cylinder sleeve 30, a floating piston 29 is provided in the upper cylinder sleeve 30, and a protective shearing nail 32, a second auxiliary piston 33, a limiting sleeve 34 and a locking sleeve 35 are provided in the lower cylinder sleeve 31 from left to right. A second locking spring 36 is provided at the right end of the lower cylinder sleeve 31, and an unsealing shearing nail 37 is provided at the right end of the locking sleeve 35.

[0067] The implementation steps of the self-righting packer are as follows:

[0068] When setting, when the oil pipe 48 is pressurized, the upper sleeve 30 moves rightward to cut off the protective shear pin 32, the setting protection is opened, and the floating piston 29 pushes the second lower pressure ring 28 to the left, pushing the straightening block 24 to expand along the second upper joint 21 to contact the sleeve, straightening the self-righting packer, continuing to pressurize, compressing the second connecting rubber cylinder 26 to expand and complete the sealing, and at the same time, the second locking spring 36 and the second locking sleeve 35 are stepped and locked, completing the setting. When unsealing, lift the pipe column, the unsealing shear pin 37 is cut off, the second rubber cylinder shaft 27, the second lower pressure ring 28 and all the components on the right side move downward as a whole, the second connecting rubber cylinder 26 is unsealed, and the straightening block 24 is retracted.

[0069] The tracer monitoring and water blocking device includes a control circuit 38, on the right side of which are arranged a battery 39, a motor 40, a switch valve 41, a tracer short-circuit device 42, a one-way valve 43 and upper and lower stratum fluid channels 44 in sequence. The control circuit 38 is arranged in an oil pipe 48, and a pressure-conducting hole 47 is arranged at the bottom of the control circuit 38. A bridge body 46 is arranged outside the tracer short-circuit device 42, and the bottom of the bridge body 46 is connected to a stratum fluid channel component 45.

[0070] The switching valve 41 is controlled by the control circuit 38. The upper and lower layer fluid channels 44 are used to connect the upper and lower layers, and the state of the switching valve 41 does not affect the connection between the upper and lower layers.

[0071] The tracer short-circuiting device 42 includes an intelligent switch 49 and a casing 54. Second adapters 51 are provided at both the left and right ends of the casing 54. The intelligent switch 49 is connected to the casing through the second adapter 51. The casing 54 is connected to the first adapter 50 at the right end of the first oil pipe 48a through the second adapter 51. Two mesh plates 52 are provided in the middle of the casing 54, and the mesh plates 52 are connected to the inner wall of the casing 54 through fixing screws 53.

[0072] The intelligent switch 49 is of an integrated bridge structure, contains a microprocessor, and operates remotely through a pre-set program or a ground command.

[0073] The tracer short-circuiting device 42 is designed with a through-flow liquid. The tracer strips are rectangularly and evenly distributed in the tracer short-circuiting device 42. When the formation fluid passes through the tracer short-circuiting device 42, on the one hand, the formation fluid scours the tracer strips, and on the other hand, the formation fluid soaks the tracer strips, achieving the purpose that the tracer can be fully dissolved in the formation fluid and ensuring that the tracer content can be detected in the produced fluid.

[0074] There are two types of the tracer strips, both made of trace elements, one is water-soluble and the other is oil-soluble.

[0075] Example 1:

[0076] When the intelligent switch 49 is in a pre-set program running state, the intelligent switch 49 switches on and off regularly according to the pre-set program in sequence and automatically without ground intervention. When the intelligent switch 49 is in the closed state, the fluid cannot enter the oil pipe 48; when the intelligent switch 49 is in the open state, the layer fluid channel assembly 45 is in a flowing state, and the on-off of the flow path is controlled by the switching valve 41. The formation fluid enters the intelligent switch 49 through the bridge body 46, flows out of the bridge body 46 from the liquid outlet hole of the intelligent switch 49, and flows into the oil pipe 48 to be produced. Each layer is alternately produced regularly in sequence. The formation fluid carries out the tracer, and through ground monitoring and metering, the production characteristics of each layer are determined.

[0077] Example 2:

[0078] When the intelligent switch 49 is in the ground command remote control state, the ground voltage control technology is used. The ground voltage control technology refers to the use of positive pressure pulse signal transmission technology for intelligent layered production of oil wells. By pressurizing - depressurizing - pressurizing the annulus at the wellhead, a specific pressure wave command signal is generated. By encoding the commands, each command contains formation and action information. This signal is transmitted through the wellbore to the downhole, enabling the intelligent switch 49 to open or close the formation as required, achieving water plugging or layer adjustment.

[0079] Please refer to Figure 7 , when remotely adjusting the layer on the ground, use a pump truck to generate a water pressure pulse wave in a specific format from the tubing - casing annulus on the ground on the tubing 48, controlling the opening or closing action of the downhole intelligent switch 49, achieving remote control of the downhole on the ground and the purpose of arbitrarily selecting layers for production.

[0080] It should be noted that the microprocessor of the intelligent switch 49 can use a commonly used MCU (micro - control unit) on the market, and the sensor for receiving pressure signals can be obtained by purchase. Those skilled in the art can Figure 7 convert it into a program and write it into the microprocessor.

[0081] A method for using a horizontal well tracer water - finding test string includes the following steps:

[0082] S1. Selection well standard inspection:

[0083] (1) The sleeve is intact without leakage points, there is no cross - flow outside the casing 54, which is convenient for pressure - testing construction. The well does not produce sand, scale, or wax, and there is no serious gas production. The working environment of the instrument should not exceed the given depth, temperature, and pressure indicators. The formation interval > 3m, which is convenient for using a release - type hanging packer and a self - righting packer to latch open the formation. The total liquid production of the whole well should be as large as possible to avoid the phenomenon of dry pumping of the sucker rod pump due to insufficient liquid supply during single - layer production. The pump truck performs well when applying the pressure wave command.

[0084] (2) Construction requirements: When running the hole and washing the well, use a hole opener with an outer diameter ≥ Ф114mm and a length ≥ 1200mm to run the hole to 20m below the setting position of the release - type hanging packer and the self - righting packer, and wash the well for more than one and a half cycles until clear water returns at the wellhead. When scraping the pipe, use a scraper to scrape to the setting position of the release - type hanging packer and the self - righting packer, and scrape back and forth 3 - 5 times at 3m above and below the setting position, and wash the well for more than one and a half cycles until clear water returns at the wellhead.

[0085] S2. Preparation before lowering the tool: Confirm that the tool is accurate, check that the thread is undamaged, there is no debris in the inner cavity of the tool, and the rubber cylinder has no scratches or damage. During the lowering process, the lowering speed ≤ 30 tubing 48 per hour, and ≤ 20 tubing 48 per hour when entering the horizontal section or the perforated section.

[0086] S3. Tubing string implementation: Pressurize inside the tubing string 48 in one trip. Each packer is set, isolating the lower well section. The tracer monitoring and water shutoff device corresponds to the respective layer section. The check valve 43 of the tracer monitoring and water shutoff device is in the closed state when pressurizing inside the tubing string 48. After the packer is set, the tubing string 48 is disconnected from the release packer, and a production tubing string is run in to produce fluid. The formation fluid flows through the tracer monitoring and water shutoff device, carrying the tracer into the tubing string 48 and being pumped to the surface. Analyze the production volume and concentration of the tracer elements contained in the fluid to determine the fluid properties of each layer.

[0087] S4. Packer setting operation:

[0088] a. According to the construction design requirements, connect the tubing string with 2 7 / 8 TBG tubing 48 and run it into the well to the designed position. Inject water and pressurize at a displacement of 5 - 6 m³ / h. When the pressure reaches 10 MPa, 15 MPa, and 18 MPa, stabilize the pressure for 3 minutes each. When the pressure is increased to 20 - 24 MPa at a small displacement, the packer setting is completed.

[0089] b. When releasing, lift the tubing string to release the setting tool of the plugging technology tubing string, and the release force is 60 ± 10 kN.

[0090] c. When probing the bottom, after the setting tool is released, lift the tubing string 3 - 5 m, and then slowly lower the tubing string until the tool is detected (the probing force does not exceed 50 kN). If the position remains unchanged, it indicates that the tool is set reliably, and then the setting tool is pulled out.

[0091] d. When running the pump for production, run in the production tubing string and pump according to the production parameter requirements for production oil extraction.

[0092] e. When sampling and testing, perform sampling and sample analysis work according to the program design requirements until the analysis of the liquid production layer section is completed.

[0093] f. When fishing operation is required, after the test is completed, if it is necessary to fish out the test tubing string, connect a special fishing tool with 2 7 / 8 TBG tubing 48 and run it into the well to collide with the fish head 2. The fishing claw grabs and locks the fish head 2, and lifting can release it. It is necessary to repeat the lifting and lowering actions several times to loosen the accumulated sand for complete release. If the tool is buried by sand, it is necessary to fish while flushing until it is fished out.

[0094] Specifically, as Figure 9 shown, the SP1 horizontal well had high water cut at the start of production, which was quite different from the geological understanding. It was decided to carry out tracer water - finding logging to comprehensively evaluate the liquid production and water production of each section. Since the water - producing layer and the main liquid - producing layer were not clear, a combination of release packer and self - righting packer was used to divide the production layer into two layers, and a tracer monitoring device was equipped in each layer for stratified production test.

[0095] Specifically, as Figure 10 and Figure 11As shown, for the tracer water finding effect tracking, the production process description is as follows: in the first stage after well opening, the whole well is produced together. The liquid production is 46 tons, the oil production is 1.9 tons, the water cut is 95.9%, and the liquid level is 376 meters. In the second stage, the upper layer switch is closed, and only the lower layer is produced. The liquid production is 45.3 tons, the oil production is 4.3 tons, the water cut is 90.5%, and the liquid level is 528 meters. In the third stage, the lower layer switch is closed, and only the upper layer is produced. The liquid production is 46 tons, the oil production is 0.9 tons, the water cut is 98.1%, and the liquid level is 381 meters.

[0096] From the tracer concentration curve of this well, it can be seen that when producing together, two tracers are detected. When only the upper layer is produced and when only the lower layer is produced, only the tracers corresponding to the respective layers are monitored, indicating that the layer sealing string is effective and the packer has good sealing.

[0097] Specifically, as Figure 12 and Figure 13 shown, for the energy condition analysis, from the liquid level curve during the normal production of this well, it can be seen that when producing together, the average liquid level is 376 meters. When only the lower layer is produced, the liquid level is 528 meters. When only the upper layer is produced, the liquid level is 381 meters. The liquid level difference between the upper layer and the lower layer is 147 meters. The energy of the upper layer is better than that of the lower layer, and the pressure difference within the layer is about 1.3 MPa.

[0098] For the comprehensive water cut condition analysis, from the comprehensive water cuts of the three stages of this well, it can be seen that when producing together, the comprehensive water cut is 95.9%. When only the lower layer is produced, the water cut is 90.5%. When only the upper layer is produced, the water cut is 98.1%. The water cut of the upper layer is higher than that of the lower layer. Combining the energy conditions of the upper and lower layers, it is analyzed that the upper layer is the main production layer or the water-producing layer.

[0099] Specifically, as Figure 14 and Figure 15 shown, for the water production contribution rate analysis, according to the detection results of the tracer concentration during combined production, the water production contribution rates of each layer in the combined production stage are calculated: the upper layer is 81.94%; the lower layer is 18.06%, and the upper layer is the main water-producing layer.

[0100] In summary:

[0101] The trace element tracer is prepared into a tracer jumper. Each tracer jumper contains two tracers, one is water-soluble and the other is oil-soluble. The tracer monitoring and water plugging device is run into different horizontal sections together with the tubing 48 during the completion stage. After the oil well starts production, samples of the produced fluid are regularly taken at the wellhead, and the production amounts and concentrations of different tracers are analyzed and tested. The liquid production amounts and water production amounts of each horizontal layer section are calculated, the liquid production amounts and water cut rates of each layer section are analyzed, the water-producing layer sections are identified, the high water-cut layers are closed, and the high oil-bearing layers are produced. Through the tracer water finding string, sectional tracer water finding is carried out on the horizontal section reservoir of the horizontal well to determine the water-producing layer, and through the sectional water control string run into the tracer water finding string, multiple water control sections are sectionally sealed and water control oil production is carried out, which improves the water finding and water control efficiency of the horizontal section reservoir of the horizontal well.

[0102] In this application, all components that are not elaborated on and the connection methods of each component in this application belong to the well-known technologies in the technical field. They can be directly applied and will not be elaborated further.

[0103] In the present invention, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "joined" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0104] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0105] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0106] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A horizontal well tracing water testing string, comprising an interlayer packer arranged on an oil pipe, characterized in that: It also includes tracer monitoring and water shutoff devices; The tracer monitoring and water blocking device is arranged on the oil pipe, at least one tracer monitoring and water blocking device is arranged, and each tracer monitoring and water blocking device corresponds to an oil-water layer.

2. A horizontal well tracing water-finding test string according to claim 1, characterized in that: A drop-hanging packer is also arranged at the uppermost end of the oil pipe.

3. A horizontal well tracing water-finding test string according to claim 2, characterized in that: When there are multiple tracer monitoring and water blocking devices, interlayer packers are arranged between each of the tracer monitoring and water blocking devices.

4. A horizontal well tracing water-finding test string according to claim 3, characterized in that: The packers are all provided with a step-locking mechanism, a straightening mechanism and a safe release mechanism, and the interlayer packers are also provided with a resistance mechanism.

5. A horizontal well tracing water-finding test string according to claim 4, characterized in that: The step-locking mechanism comprises a locking sleeve and a first locking spring corresponding thereto, and a locking sleeve and a second locking spring corresponding thereto; The said straightening mechanism comprises an upper cone, a connecting slip, a lower cone, a straightening sleeve and a straightening block, which ensures that the first connecting rubber tube and the second connecting rubber tube are centered and sealed; The safety disengagement mechanism includes a shear pin release mechanism and a shear pin release mechanism; The resistance mechanism is a protective shear nail.

6. A horizontal well tracing water-finding test string according to claim 5, characterized in that: The drop-hanging packer is provided with a first upper joint, an upper center pipe, a lower center pipe, and a sliding sleeve on the inner shell from left to right in sequence; The outer part of the upper center tube is covered with a fish top, a locking sleeve and a cylinder in sequence, the locking sleeve is provided with a first locking spring for locking the cylinder, the right end of the upper center tube is also covered with an unsealing sleeve, and a first auxiliary piston is provided between the unsealing sleeve and the cylinder body; The outer part of the lower central tube is covered with a first rubber cylinder shaft, an upper cone, a connecting slip and a lower cone in sequence from left to right; The first rubber cylinder shaft is covered with a first upper pressure ring, a first connecting rubber cylinder and a first lower pressure ring in sequence from left to right; The connecting slips are covered with slip covers, and the sliding sleeves are provided with shear pins and a lower joint.

7. A horizontal well tracing water-finding test string according to claim 6, characterized in that: The interlayer packer is a self-righting packer, and the self-righting packer is provided with a second upper joint, a righting block, a second upper pressure ring, a second rubber cylinder shaft, an upper cylinder sleeve and a lower cylinder sleeve in sequence from left to right on the inner shell; The second upper joint is externally covered with a back cap and a straightening sleeve; The second rubber cylinder shaft is sleeved with a second connecting rubber cylinder, a second lower pressure ring is arranged between the second rubber cylinder shaft and the upper cylinder sleeve, and a floating piston is arranged in the upper cylinder sleeve; The lower cylinder sleeve is provided with a protective shear pin, a second auxiliary piston, a limit sleeve and a locking sleeve from left to right in sequence, and a second locking spring is provided at the right end of the lower cylinder sleeve; The right end of the locking sleeve is provided with an unsealing shear pin.

8. A horizontal well tracing water-finding test string according to claim 7, characterized in that: The tracer monitoring and water blocking device includes a control circuit, a valve assembly, a tracer short-circuit device, a one-way valve and upper and lower stratum fluid channels; The control circuit is arranged in the oil pipe, and a pressure-conducting hole is also arranged at the bottom of the control circuit; A bridge body is arranged outside the tracer short-circuit device, and a layer fluid channel component is arranged at the right end of the bridge body.

9. A horizontal well tracing water-finding test string according to claim 8, characterized in that: The tracer short-circuit device adopts a mid-flow liquid design, and the tracer short-circuit device includes an intelligent switch and a sleeve, and the intelligent switch is connected to the left end of the sleeve through a second adapter; The right side of the casing is connected to the first adapter on the first oil pipe through the second adapter.

10. A horizontal well tracing water-finding test string according to claim 9, characterized in that: Two mesh plates are arranged in the middle of the sleeve, and the mesh plates are connected to the inner wall of the sleeve through fixing screws.

11. A horizontal well tracing water-finding test string according to claim 10, characterized in that: The intelligent switch is an integrated bridge structure and contains a microprocessor.

12. A horizontal well tracing water-finding test string according to claim 11, characterized in that: The tracer strips are arranged in a rectangular shape and evenly distributed in the tracer short-circuit device.

13. A horizontal well tracing water-finding test string according to claim 12, characterized in that: There are two types of tracer strips, both made of trace elements, one is water-soluble and the other is oil-soluble.

14. A horizontal well tracing water-finding test string according to claim 13, characterized in that: The intelligent switch operates through a pre-set program; The intelligent switch switches on and off according to a predetermined program in a timed sequence and switches automatically without ground intervention. The formation fluid enters the intelligent switch through the bridge body, flows out of the bridge body from the intelligent switch outlet hole, and flows into the oil pipe to be produced. Each layer is produced in a timed sequence, and the formation fluid brings out the tracer. The output characteristics of each layer are determined through ground monitoring and measurement.

15. A horizontal well tracing water-finding test string according to claim 13, characterized in that: The intelligent switch is remotely controlled by ground command and uses ground pressure control technology; The surface pressure control technology refers to the use of pressure positive pulse transmission signals to generate a specific pressure wave command signal by pressurizing-releasing-pressurizing the wellhead annulus, so that the intelligent switch opens or closes the layer as required.

16. A method for using a horizontal well tracer water testing string, characterized in that: The following steps are involved: a. According to the construction design requirements, the tubing is connected to the pipe string and lowered into the well to the designed position, and the packer is set; b. When releasing the pipe, lift up the pipe column and release the sealing tool of the plugging process pipe column; c. When probing the bottom, after the sealing tool is thrown away, lift the pipe string, and then slowly lower the pipe string until the tool is found. If the position remains unchanged, it means that the tool is reliably sealed, and then remove the sealing tool; d. During the pump production, the production string and pump are lowered according to the production parameter requirements to produce oil; e. During sampling and testing, carry out sampling and sample testing according to the design requirements, and analyze the liquid-producing layer until the end of the test.

17. A method for using a horizontal well tracer water-finding test string according to claim 16, characterized in that: The following steps are also included: During the salvage operation, after the test is completed, when the test pipe needs to be salvaged, use the oil pipe to connect the special salvage tool to go down the well and collide with the fish top. The salvage claw grabs and locks the fish top, and it can be unsealed by lifting it up. It is necessary to repeat the lifting and lowering actions several times to loosen the accumulated sand and unseal it completely. If the tool is buried in sand, it needs to be rinsed and salvaged at the same time until it is salvaged.

18. A special testing device for horizontal well tracing water testing string, characterized in that It includes a tracer monitoring and water blocking device, which includes a stratum fluid channel component and a bridge body connected to the left end of the stratum fluid channel component. A one-way valve connected to the left end of the stratum fluid channel component is arranged inside the bridge body, and a tracer short-circuit device is connected to the left end of the one-way valve. A valve assembly and a control circuit are arranged at the left end of the tracer short-circuit device, and a pressure guide hole is also arranged at the bottom of the control circuit.

19. A horizontal well tracing water testing string dedicated testing device according to claim 18, characterized in that: The tracer short-circuit device adopts a mid-through liquid design, and includes an intelligent switch, a casing and a first oil pipe. The intelligent switch is connected to the left end of the casing, and the right end of the casing is connected to the first oil pipe, so that the casing is located inside the first oil pipe. The intelligent switch contains a microprocessor, and the intelligent switch has two working modes: a preset program and ground remote control. Tracer strips are evenly arranged in the casing. There are two types of tracer strips, both of which are made of trace elements, one is water-soluble and the other is oil-soluble.

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