Liquid production device, acidizing sand control oil production pipe column, water injection oil production pipe column and method thereof

Abstract

The application discloses a liquid sampling device, an acidizing sand control oil production pipe column, a water injection oil production pipe column and a method thereof, and relates to the field of efficient oil well exploitation. The liquid sampling device comprises an upper assembly and a lower assembly. The acidizing sand control oil production pipe column comprises a first plug, a first oil pipe, a first casing pipe, a plurality of first layered packers, a hanging and releasing packer and a plurality of liquid sampling devices. The water injection oil production pipe column comprises a second plug, a second oil pipe, a second casing pipe, a plurality of second layered packers, a hanging packer and a plurality of liquid sampling devices. During construction, acid liquid or water is injected into each layer from bottom to top, and then oil production operation is performed. The application can realize layered oil production and layered water injection in the same well, realize one-well multi-use, meet different layer injection and production in the same well at different time periods, and reduce the cost of separate drilling.

Description

Technical Field

[0001] This patent relates to the field of efficient oil well production, specifically to fluid production devices, acidizing and sand control oil production tubing, water injection oil production tubing, and methods thereof. Background Technology

[0002] Offshore oilfields have entered a high water-cut phase. Long-term water injection has further exacerbated inter-layer interference, increasing the difficulty of extraction. Layered well development can effectively improve reservoir utilization and ultimately enhance oil recovery. Currently, several major challenges exist: 1. Some high-permeability reservoirs have low pressure coefficients, resulting in large reservoir damage invasion radii. Simultaneously, particulate migration can clog near-wellbore zones and perforations, reducing permeability and production capacity; 2. Long-term production has led to significant inter-layer differences, with multiple small layers being produced together, resulting in large permeability variations. Long-term water injection has further exacerbated inter-layer interference; statistics show that the combined production volume is 33.5% of the layered production volume; 3. Currently, offshore wells commonly use 7-inch first casing for completion. Achieving separate production after layered sand control within the 7-inch first casing wellbore is even more difficult. Given the significant increase in production and fluid output from operating wells, improving the unclogging effect of low-fluid wells and enhancing oil recovery is particularly important.

[0003] Patent CN204299556U discloses an integrated tubing string for stratified acidizing and downhole water injection, consisting of a downhole first tubing string and a stratified water distribution string. The stratified water distribution string is formed by sequentially connecting a water distributor, a packer, a water distributor, a ball seat, a screen pipe, and a first plug. A reciprocating switch is installed between the water distributor of the downhole first tubing string and the stratified water distribution string. In principle, this invention achieves stratified acidizing and downhole stratified water injection in a single tubing run. However, this invention requires the insertion of a retrieveable plug during acidizing, and then the plug needs to be retrieved and replaced with a matching steel ball during subsequent water injection to implement stratified water injection. The construction steps are relatively cumbersome, which does not conflict with this invention.

[0004] Patent CN106703763A discloses an intelligent stratified production system suitable for sand control completion in offshore oilfields. The system includes a wellhead Christmas tree, downhole safety valve, cable packer, Y-joint, perforated tubing, cable positioning seal, first intelligent production distributor, first cable insertion seal, second intelligent production distributor, second cable insertion seal, third intelligent production distributor, and a plug connected via a first tubing. The cable packer is equipped with a vent valve and a cable pass-through device. The Y-joint connects to an EV pump unit, which is connected to an EV pump control system. The first, second, and third intelligent production distributors are all connected to a surface controller. This invention can achieve water discovery, stratified testing, water shut-off, and stratified production in a single operation. It can monitor and control downhole parameters such as flow rate, water cut, pressure, and temperature in real time, enabling low-cost and efficient oilfield development and is suitable for sand control completion in offshore oilfields. Because the Y-joint connection to the ESP unit requires a large wellbore inner diameter, it is difficult to implement layered sand control in the 7-inch small-diameter wells of the Shengli Oilfield offshore oilfield. Furthermore, the frequently used acidizing and de-clogging operation adds an extra step, reducing construction efficiency. Summary of the Invention

[0005] In view of the above-mentioned defects in the existing technology, one of the objectives of the present invention is to provide a fluid collection device, which is equipped with fluid inlet and outlet channels and can realize multiple functions of oilfield fluid collection and injection.

[0006] Another objective of this invention is to provide an acidizing and sand control oil production tubing string using the fluid production device and its construction method, which enables stratified acidizing while rapidly carrying out stratified sand control and stratified oil production operations, thereby improving operational efficiency and reducing high offshore operating costs.

[0007] Another objective of this invention is to provide a water injection oil production tubing string using the fluid production device and its construction method, which enables rapid stratified oil production operations while simultaneously performing stratified water injection, thereby improving operational efficiency and reducing high offshore operating costs.

[0008] To achieve the above objectives, the present invention adopts the following technical solution.

[0009] A liquid sampling device, comprising an upper component and a lower component.

[0010] The upper assembly includes an upper connector, an adjusting sleeve, a central tube, a valve, an upper ball seat, a sealing tube, and a connector. The central axes of the inner holes of the upper connector, the adjusting sleeve, the central tube, the valve, the upper ball seat, the sealing tube, and the connector are all on the same vertical straight line. The inner wall of the upper connector is threaded to the outer wall of the upper end of the central tube, and the adjusting sleeve is threaded to the outer wall of the upper connector. The adjusting sleeve is provided with an anti-rotation pin embedded in the upper connector. The outer wall of the lower end of the central tube is threaded to the inner wall of the upper end of the connector. The connection is as follows: a valve is fitted on the outer wall of the central tube, and a corrosion-resistant sealing sleeve is fitted on the upper outer wall of the connector, with the top of the corrosion-resistant sealing sleeve contacting the valve; a spring ring and a gasket ring are fitted on the central tube, with the lower end of the spring ring contacting the valve, the upper end of the spring ring contacting the gasket ring, and the top of the gasket ring contacting the adjusting sleeve; a liquid injection through hole is provided below the valve of the central tube, and an upper ball seat is fixed on the inner wall of the central tube by a shear pin, which seals the liquid injection through hole, thereby forming a cavity between the corrosion-resistant sealing sleeve, the valve, the central tube, and the connector.

[0011] The lower assembly includes an upper outer sleeve, a sealing tube, and a lower outer sleeve. The central axes of the inner holes of the upper outer sleeve, the sealing tube, and the lower outer sleeve are all collinear with the central axis of the inner hole of the upper connector. The outer diameter of the lower end of the upper outer sleeve is larger than the outer diameter of the rest of its length, and the inner diameter of the lower end of the upper outer sleeve is larger than the inner diameter of the rest of its length. The upper inner wall of the upper outer sleeve is threaded to the lower outer wall of the connector. The outer diameter of the upper end of the lower outer sleeve is larger than the outer diameter of the rest of its length, and the inner diameter of the upper end of the lower outer sleeve is larger than the inner diameter of the rest of its length. The radial inner circumferential surfaces of the lower ends of the upper and lower outer sleeves are threaded to the outer wall of the sealing tube. The lower end of the upper outer sleeve is threaded to the upper end of the lower outer sleeve, thereby... A clamping cavity is formed between the upper outer sleeve, the lower outer sleeve, and the sealing tube; one or more sets of return components are vertically arranged inside the clamping cavity; each return component includes, from top to bottom, a battery, a circuit, a motor, a sealing sleeve, and a lower ball seat; the bottom end of the lower ball seat contacts the top surface of the part where the inner diameter of the lower outer sleeve increases; the lower end of the motor is provided with a lifting sealing rod, the lower end of which is inserted into the inner hole of the sealing sleeve; a sealing ball is provided on the inner hole of each lower ball seat; several third collection through holes are provided below the lower ball seat of the lower outer sleeve; a first collection through hole is provided directly below the motor above each lower ball seat of the sealing tube; a second collection through hole is provided on each sealing sleeve that is closest to the sealing sleeve, and the second collection through hole is connected to the first collection through hole.

[0012] As a preferred technical solution, the adjusting sleeve is equipped with an anti-rotation pin that can be embedded in the upper connector.

[0013] As a preferred technical solution, a shape memory filter tube is provided on the outer wall of the lower jacket.

[0014] As a preferred technical solution, the valve is sealed to the outside of the central tube, the upper ball seat to the inside of the central tube, the upper outer sleeve to the sealing tube, the upper outer sleeve to the lower outer sleeve, and the sealing sleeve to the inner wall of the lower outer sleeve and the outer wall of the sealing tube by rubber rings.

[0015] As a preferred technical solution, mechanical seals are used between the corrosion-resistant sealing sleeve and the valve, between the sealing rod and the sealing sleeve, and between the sealing ball and the sealing sleeve.

[0016] As a preferred technical solution, the diameter of the first sleeve is 7 inches.

[0017] An acidizing sand control oil production tubing string is characterized by comprising: a first plug, a first tubing, a first casing, several first layer packers, a suspended drop packer, and several of the aforementioned fluid production devices;

[0018] The first plug is located at the bottom, the first layered packer is placed between the upper and lower oil layers, the suspended release packer is placed at the top of the uppermost oil layer, and each sampling device is located in an oil layer. The first plug, the first layered packer, the suspended release packer, and the sampling device are all connected through the first oil pipe and are placed inside the first sleeve. The inner diameter of the upper ball seat of each sampling device gradually decreases from top to bottom.

[0019] As a preferred technical solution, the number of liquid collection devices is 2-6.

[0020] As a preferred technical solution, the suspended release packer is preferably the Y445 packer, etc.

[0021] As a preferred technical solution, the first layer packer is preferably the Y341 packer.

[0022] The above-mentioned construction method for acidizing and sand control oil production tubing is characterized by comprising the following steps:

[0023] An upper ball seat sealing ball is inserted, which is sealed to the inner hole of the upper ball seat of the fluid production device corresponding to the lowest stratum to be mined. Acid is injected into the first oil pipe by starting the pump on the ground. After the fluid production device reaches a certain pressure, the upper ball seat sealing ball cuts the shear pin, the upper ball seat falls, and the injection port is opened. The injected acid enters through the injection port, pushes up the valve, and the acid enters the formation to begin acidification. After the pump stops, the valve automatically closes under the action of the spring coil to prevent the formation from backflowing.

[0024] The shape memory filter pipe expands to fill the space between the first oil pipe and the first casing, achieving a layered sand prevention effect.

[0025] When fluid collection is required, the system is activated at a set time via a pre-programmed sequence on the host computer or by a ground-based pressure pulse device. Under circuit control, the motor drives the sealing rod upward, and the collected fluid enters the first return through-hole of the lower outer sleeve through the shape memory filter tube. Then, it enters the clamping cavity, causing the sealing ball to separate from the lower ball seat. The collected fluid then enters the fluid collection device through the inner holes of the lower ball seats of each return component, the inner holes of the sealing sleeve, the first collection through-hole, and the second collection through-hole. Under the action of the oil pump, the fluid is collected to the ground, completing the mining of the formation to be mined.

[0026] Then, following the above method, the mining of other layers to be mined is completed step by step from bottom to top.

[0027] As a preferred technical solution, the shape memory filter tube is activated by pumping in a special stimulating liquid or by temperature sensing. The sand-prevention principle of the shape memory filter tube is as follows: in a compressed state like a well, the screen tube expands by being activated by downhole temperature or by subsequent activation, filling the annulus and blocking sand flow.

[0028] As a preferred technical solution, the special stimulating liquid is an aqueous solution of KCl.

[0029] The water injection oil production tubing string includes a second plug, a second tubing, a second casing, several second-layer packers, a suspended packer, and several of the aforementioned fluid production devices;

[0030] The second plug, second layer packer, suspended packer, and fluid sampling device are all connected through the first tubing and are placed inside the second casing. The second plug is located at the bottom, and the suspended packer is located at the top of the uppermost oil layer. The second layer packers are placed between the upper and lower oil layers, and each oil layer corresponds to a fluid sampling device. The inner diameter of the upper ball seat of each fluid sampling device gradually decreases from top to bottom.

[0031] As a preferred technical solution, the number of liquid collection devices is 2-6.

[0032] The construction method for the above-mentioned water injection oil production tubing includes the following steps:

[0033] A sealing ball is inserted into the upper ball seat, which seals with the inner hole of the upper ball seat of the fluid collection device corresponding to the lowest stratum to be mined. Water is injected into the second oil pipe by starting the pump on the ground. After the fluid collection device reaches a certain pressure, the sealing ball of the upper ball seat cuts the shear pin, and the upper ball seat falls down, opening the injection port. The injected water enters through the injection port, lifts the valve, and enters the stratum. After the pump stops, the valve automatically closes under the action of the spring coil.

[0034] When oil extraction is needed, the system is activated at a set time via a pre-programmed sequence on the host computer or by a pressure pulse device on the ground. Under the control of the circuit, the motor drives the sealing rod to move upward, connecting the third collection through-hole with the inner hole of the lower ball seat. The oil enters the first return through-hole of the lower outer sleeve through the shape memory filter pipe, and then enters the clamping cavity to separate the sealing ball from the lower ball seat. The extracted fluid enters the fluid extraction device through the inner hole of the lower ball seat of each return component, the inner hole of the sealing sleeve, the first collection through-hole, and the second collection through-hole. Under the action of the oil pump, the fluid is extracted to the ground, completing the extraction of the formation to be extracted.

[0035] Then, following the above method, the mining of other layers to be mined is completed step by step from bottom to top.

[0036] As a preferred technical solution, after water injection is completed, when sand prevention is required, the shape memory filter pipe expands to fill the space between the second oil pipe and the second casing, thereby achieving a layered sand prevention effect.

[0037] As a preferred technical solution, the shape memory filter tube is activated by pumping in a special stimulating liquid or by temperature sensing.

[0038] As a preferred technical solution, the special stimulating liquid is an aqueous solution of KCl.

[0039] Compared with the prior art, the present invention has the following advantages:

[0040] 1. The fluid sampling device has a unique structure. During use, simply inserting a sealing ball into the inner hole of the upper ball seat and applying pressure opens the fluid injection channel. The opening of the fluid sampling channels can be controlled by a pre-programmed sequence on the host computer or by a ground-based pressure pulse device. When sand control is required, the shape memory filter pipe expands to fill the space between the first oil pipe and the first casing, achieving a layered sand control effect.

[0041] 2. Through its integrated design, this tubing string achieves the goals of layered acidizing, layered sand control, and layered oil production in a single run, thereby improving operational efficiency.

[0042] 3. By using an internally controlled separate extraction method with shape memory sand filtering, the sand control is not limited by the current sand control diameter, and the separate sand control and extraction in the first 7-inch well is realized;

[0043] 4. The tubing structure can be layered up to six levels, meeting the needs of intelligent defense and extraction in offshore oilfields;

[0044] 5. The acid injection channel is equipped with an anti-backflow structure to ensure that formation sand and other foreign objects do not enter the tubing during backflow construction;

[0045] 6. This tubing structure enables layered oil production and water injection within the same well through an alternative development method, achieving multiple uses for a single well and meeting the needs of different layers for injection and production at different times within the same well, thereby reducing the cost of individual drilling. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of a preferred embodiment of the acidizing sand control oil production tubing of the present invention.

[0047] Figure 2 This is a schematic diagram of the liquid collection device.

[0048] Figure 3 yes Figure 2 A magnified view of part A.

[0049] Figure 4 yes Figure 3 A magnified view of part C.

[0050] Figure 5 yes Figure 3 A magnified view of part D.

[0051] Figure 6 yes Figure 2 A magnified view of part B.

[0052] Figure 7 yes Figure 6 A magnified view of part E.

[0053] Figure 8 yes Figure 7 A magnified view of part G.

[0054] Figure 9 yes Figure 6 A magnified view of part F.

[0055] Figure 10 This is a schematic diagram of a preferred embodiment of a water injection oil production tubing string.

[0056] Figure 11 This is a schematic diagram of a preferred embodiment of the acidizing sand control oil production tubing of the present invention.

[0057] Figure 12 This is a schematic diagram of a preferred embodiment of a water injection oil production tubing string.

[0058] Wherein: 1-First plug, second plug-10, 2-First tubing, second tubing-20, 3-First casing, 30-Second casing, 4-Sampling device, 5-First layer packer, 50-Second layer packer, 6-Suspended release packer, 7-Suspended packer;

[0059] 400-Injection through hole, 401-Upper connector, 402-Anti-rotation pin, 403-Adjusting sleeve, 404-Gasket ring, 405-Spring ring, 406-Center tube, 407-First rubber ring, 408-Valve, 409-Cut pin, 410-Upper ball seat, 411-Corrosion-resistant sealing sleeve, 412-Connector, 413-Upper outer sleeve, 414-Sealing tube, 415-Battery, 416-Circuit circuit, 417-Motor, 418-Sealing rod, 419-Sealing sleeve, 420-Sealing ball, 421-Lower ball seat, 422-Lower outer sleeve, 423-Shape memory filter tube, Third collection through hole-424, First collection through hole-425, Second collection through hole-426, Second rubber ring-427, Third rubber ring-428, Fourth rubber ring-429, Fifth rubber ring-430, Sixth rubber ring-431. Detailed Implementation

[0060] The present invention will now be further described with reference to the accompanying drawings and embodiments.

[0061] Example 1. As... Figure 2-9 As shown, the liquid sampling device 4 includes an upper component and a lower component.

[0062] The upper assembly includes an upper connector 401, an anti-rotation sleeve 402, an adjusting sleeve 403, a central tube 406, a valve 408, an upper ball seat 410, a sealing tube 414, and a connector 412, all with their inner bores aligned vertically. The inner wall of the upper connector 401 is threaded to the outer wall of the upper end of the central tube 406; the adjusting sleeve 403 is threaded to the outer wall of the upper connector 401; and the outer wall of the lower end of the central tube 406 is threaded to the inner wall of the upper end of the connector 412. A valve 408 is fitted onto the outer wall of the central tube 406, and a corrosion-resistant sealing sleeve 411 is fitted onto the outer wall of the upper end of the connector 412. The top of sleeve 411 contacts valve 408; a spring ring 405 and a gasket ring 404 are fitted on the central tube 406. The lower end of spring ring 405 contacts valve 408, the upper end of spring ring 405 contacts gasket ring 404, and the top of gasket ring 404 contacts adjusting sleeve 403; a liquid injection through hole 400 is provided below valve 408 of central tube 406, and an upper ball seat 410 is fixed on the inner wall of central tube 406 by shear pins. The upper ball seat 410 seals the liquid injection through hole 400, thereby forming a clamping cavity between corrosion-resistant sealing sleeve 411, valve 408, central tube 406, and connector 412.

[0063] The lower assembly includes an upper sleeve 413, a sealing tube 414, and a lower sleeve 422, all with their inner holes aligned with the central axis of the upper connector 401. The outer diameter of the lower end of the upper sleeve 413 is larger than the outer diameter of the rest of its length, and the inner diameter of the lower end of the upper sleeve 413 is larger than the inner diameter of the rest of its length. The upper inner wall of the upper sleeve 413 is threaded to the lower outer wall of the connector 412. The outer diameter of the upper end of the lower sleeve 422 is larger than the outer diameter of the rest of its length, and the inner diameter of the upper end of the lower sleeve 422 is larger than the inner diameter of the rest of its length. The radial inner circumferential surfaces of the lower ends of the upper sleeve 413 and the lower sleeve 422 are threaded to the outer wall of the sealing tube 414. The lower end of the upper sleeve 413 is threaded to the upper end of the lower sleeve 422, thereby forming a connection between the upper sleeve 413, the lower sleeve 422, and the sealing tube 414. The clamping cavity is vertically arranged with one or more sets of return flow components. Each return flow component includes, from top to bottom, a battery 415, a circuit 416, a motor 417, a sealing sleeve 419, and a lower ball seat 421. The bottom end of the lower ball seat 421 contacts the top surface of the inner diameter of the inner hole of the lower outer sleeve 422. The lower end of the motor 417 is provided with a liftable sealing rod 418, and the lower end of the sealing rod 418 is inserted into the inner hole of the sealing sleeve 419. Each lower ball seat 421 is provided with a sealing ball 420. Several third collection through holes 424 are provided below the lower ball seat 421 of the lower outer sleeve 422. A first collection through hole 425 is provided directly below the motor 417 above each lower ball seat 421 of the sealing tube 414. Each sealing sleeve 419 is provided with a second collection through hole 426 that communicates with the nearest first collection through hole.

[0064] The adjusting sleeve 403 is provided with an anti-rotation pin 402 that can be inserted into the upper connector 401.

[0065] The outer wall of the lower jacket 422 is provided with a shape memory filter tube 423.

[0066] The valve 408 is sealed to the outside of the central tube 406, the upper ball seat 410 is sealed to the inside of the central tube 406, the upper outer sleeve 413 is sealed to the sealing tube 414, the upper outer sleeve 413 is sealed to the lower outer sleeve 422, the sealing sleeve 419 is sealed to the inner wall of the lower outer sleeve 422, and the sealing tube 414 is sealed to the outer wall.

[0067] The valve 408 is sealed to the outside of the central tube 406 by a number of first rubber rings 407; the upper ball seat 410 is sealed to the inside of the central tube 406 by a number of second rubber rings 427; the upper outer sleeve 413 is sealed to the sealing tube 414 by a number of third rubber rings 428; the upper outer sleeve 413 is sealed to the lower outer sleeve 422 by a number of fourth rubber rings 429; the sealing sleeve 419 is provided with a number of fifth rubber rings 430, which are in contact with the inner wall of the lower outer sleeve 422 and the outer wall of the sealing tube 414; the corrosion-resistant sealing sleeve 411 is sealed to the connector 412 by a sixth rubber ring 431.

[0068] Mechanical seals are used between the corrosion-resistant sealing sleeve 411 and the valve 408, between the sealing rod 418 and the sealing sleeve 419, and between the sealing ball 420 and the sealing sleeve 419.

[0069] The diameter of the first sleeve 3 is 7 inches.

[0070] Example 2. (As shown) Figure 1-9 As shown, the acidizing sand control oil production tubing string includes a first plug 1, a first tubing 2, a first casing 3, a first layered packer 5, a suspended drop packer 6, and several fluid production devices 4 as described in Embodiment 1.

[0071] The first plug 1 is located at the bottom, the first layered packer 5 is placed between the upper and lower oil layers, the suspended release packer 6 is placed at the top of the uppermost oil layer, and each sampling device 4 is located in an oil layer. The first plug 1, the first layered packer 5, the suspended release packer 6, and the sampling device 4 are all connected through the first oil pipe 2 and are placed inside the first sleeve 3. The inner diameter of the upper ball seat 410 of each sampling device 4 gradually decreases from top to bottom.

[0072] The Y445 packer is preferred for the suspended drop-out packer.

[0073] The first layer packer is preferably the Y341 packer.

[0074] The construction method of the acidizing and sand control oil production tubing string is as follows: An upper ball seat sealing ball is inserted into the inner hole of the upper ball seat 410 of the integrated layered acidizing and sand control oil production water injection device 4, which is corresponding to the formation to be exploited below. Acid is injected into the tubing 2 through a surface pump. After the integrated layered acidizing and sand control oil production water injection device 4 reaches a certain pressure, the upper ball seat sealing ball shears the shear pin 409, and the upper ball seat 410 falls, opening the acid injection through hole 400. The injected acid enters through the acid injection through hole 400, lifting the valve 408, and the acid enters the formation to begin acidizing. After the pump stops, the valve 408 automatically closes under the action of the spring 406 to prevent formation backflow, and acidizing ends. Then, a special stimulating liquid is pumped in to achieve layered sand control. The sand control principle of the shape memory filter pipe is: in a compressed state like a well, the screen pipe expands using downhole temperature or subsequent activation, filling the gap between the first tubing 2 and the first casing, blocking sand flow.

[0075] When secondary extraction is required, the system is activated at a set time via a pre-programmed sequence on the host computer or by a ground-based pressure pulse device. Under the control of circuit 416, motor 417 drives sealing rod 418 upward, connecting the third collection through-hole 424 with the inner hole of lower ball seat 409. The extracted fluid enters the first return through-hole 424 of lower outer sleeve 422 through shape memory filter pipe, and then enters the clamping cavity, separating sealing ball 420 from lower ball seat 421. The extracted fluid enters the stratified acidizing sand control oil production and water injection integrated device 4 through the inner hole of lower ball seat 421 of each return component, the inner hole of sealing sleeve 419, the first collection through-hole 425, and the second collection through-hole 426. Under the action of the oil pump, the fluid is extracted to the surface, completing the extraction of the stratum to be extracted.

[0076] Insert an upper ball seat sealing ball into the inner hole of the upper ball seat 410 of the integrated layered acidizing sand control oil production and water injection device 4 that can seal the stratum to be exploited above, and then repeat the above steps.

[0077] The special irritant liquid is an aqueous solution of KCl.

[0078] Example 3. The difference between this example and Example 2 is that the well completion is achieved by stimulating self-expansion to fill the annulus through temperature sensing, thus realizing layered sand control.

[0079] Example 4. (As shown) Figure 2-10 As shown, the water injection oil production tubing string includes a second plug 10, a second tubing 20, a second casing 30, a suspended packer 7, a second layered packer 50, and two fluid production devices 4 of Embodiment 1; located in two formations respectively.

[0080] The second plug 10, the suspended packer 7, and the fluid sampling device 4 are all connected through the first oil pipe 2 and are placed inside the second sleeve 30. The second plug 10 is located at the bottom, the suspended packer 7 is located above the uppermost oil layer, and the second layered packer 50 is located between the upper and lower oil layers. Each oil layer corresponds to a fluid sampling device 4. The inner diameter of the upper ball seat 410 of each fluid sampling device 4 gradually decreases from top to bottom.

[0081] The construction method for the water injection oil production tubing includes the following steps:

[0082] A sealing ball is inserted into the inner hole of the upper ball seat 410 of the fluid collection device 4, which is sealed to correspond to the lowest stratum to be mined. Water is injected into the second oil pipe 20 through the ground pump. After the fluid collection device 4 reaches a certain pressure, the sealing ball of the upper ball seat cuts the shear pin 409, and the upper ball seat 410 falls, opening the injection port 400. The injected water enters through the injection port 400, lifts the valve 408, and enters the stratum. After the pump stops, the valve 408 automatically closes under the action of the spring 406.

[0083] When oil extraction is needed, the system is activated at a set time via a pre-programmed sequence on the host computer or by a ground-based pressure pulse device. Under the control of circuit 416, motor 417 drives sealing rod 418 upward, connecting the third collection through hole 424 with the inner hole of lower ball seat 409. Oil enters the first return through hole 424 of lower outer sleeve 422 through shape memory filter sand tube 423, and then enters the clamping cavity, separating sealing ball 420 from lower ball seat 421. The extracted fluid enters the fluid extraction device 4 through the inner hole of lower ball seat 421 of each return component, the inner hole of sealing sleeve 419, the first collection through hole 425, and the second collection through hole 426. Under the action of the oil pump, the fluid is extracted to the surface, completing the extraction of the formation to be extracted.

[0084] Then, the mining of the upper strata was completed using the method described above.

[0085] After water injection is completed, when sand control is required, the shape memory filter pipe 424 expands to fill the space between the first tubing 2 and the first casing 3, achieving a layered sand control effect. The sand control principle of the shape memory filter pipe is as follows: when compressed in the well, the screen pipe expands using downhole temperature or subsequent activation, filling the gap between the second tubing and the second casing, thus blocking sand flow.

[0086] The shape memory filter tube 424 is activated by pumping in a special stimulating liquid.

[0087] The special irritant liquid is an aqueous solution of KCl.

[0088] Example 5. (As shown) Figure 11 As shown, the difference in this embodiment 2 is that the acidizing sand control oil production tubing string is characterized by including a first plug 1, a first tubing 2, a first casing 3, two first layer packers 5, a suspended drop packer 6, and three fluid production devices 4 as described in embodiment 1.

[0089] The first plug 1 is located at the bottom, each first layer packer 5 is placed between the upper and lower oil layers, the suspended release packer 6 is placed at the top of the uppermost oil layer, and each fluid sampling device 4 is located at an oil layer. The first plug 1, the first layer packer 5, the suspended release packer 6, and the fluid sampling device 4 are all connected by the first oil pipe 2 and are placed inside the first sleeve 3. The inner diameter of the upper ball seat 410 of each fluid sampling device 4 gradually decreases from top to bottom.

[0090] The construction method includes the following steps: A sealing ball is inserted into the inner hole of the upper ball seat 410 of the fluid collection device 4, which is sealed to correspond to the lowest stratum to be mined. Acid is injected into the first oil pipe 2 via a surface pump. After the fluid collection device 4 reaches a certain pressure, the sealing ball shears the shear pin 409, causing the upper ball seat 410 to fall and opening the injection port 400. The injected acid enters through the injection port 400, lifting the valve 408, allowing the acid to enter the formation and begin acidification. After the pump stops, the valve 408 automatically closes under the action of the spring 406 to prevent formation backflow.

[0091] The shape memory filter pipe 424 expands and fills the space between the first oil pipe 2 and the first sleeve 3 to achieve a layered sand prevention effect.

[0092] When fluid collection is required, the system is activated at a set time via a pre-programmed sequence on the host computer or by a ground-based pressure pulse device. Under the control of circuit 416, motor 417 drives sealing rod 418 to move upward. The collected fluid enters the first return through-hole 424 of the lower outer sleeve 422 through shape memory filter sand tube 424, and then enters the clamping cavity to separate sealing ball 420 from lower ball seat 421. The collected fluid enters the fluid collection device 4 through the inner hole of lower ball seat 421 of each return component, the inner hole of sealing sleeve 419, the first collection through-hole 425, and the second collection through-hole 426. Under the action of the oil pump, the fluid is collected to the ground, completing the mining of the formation to be mined.

[0093] Then, following the above method, the mining of other layers to be mined is completed step by step from bottom to top.

[0094] Example 6. (As shown) Figure 12 As shown, the difference in this embodiment 4 is that the water injection oil production tubing includes a second plug 10, a second tubing 20, a second casing 30, two second layered packers 50, a suspended packer 7, and the three fluid production devices 4 described in embodiment 1.

[0095] The second plug 10, the suspended packer 7, and the fluid sampling device 4 are all connected through the first oil pipe 2 and are placed inside the second sleeve 30. The second plug 10 is located at the bottom end, and the suspended packer 7 is located at the top end of the uppermost oil layer. The second layered packers 50 are respectively placed between the upper and lower oil layers, and each oil layer corresponds to a fluid sampling device 4. The inner diameter of the upper ball seat 410 of each fluid sampling device 4 gradually decreases from top to bottom.

[0096] During construction, a sealing ball is inserted into the inner hole of the upper ball seat 410 of the fluid collection device 4, which is corresponding to the lowest stratum to be mined. Water is injected into the second oil pipe 20 through the ground pump. After the fluid collection device 4 reaches a certain pressure, the sealing ball of the upper ball seat cuts the shear pin 409, and the upper ball seat 410 falls, opening the injection port 400. The injected water enters through the injection port 400, lifts the valve 408, and enters the stratum. After the pump stops, the valve 408 automatically closes under the action of the spring 406.

[0097] When oil extraction is needed, the system is activated at a set time via a pre-programmed sequence on the host computer or by a ground-based pressure pulse device. Under the control of circuit 416, motor 417 drives sealing rod 418 upward, connecting the third collection through hole 424 with the inner hole of lower ball seat 409. Oil enters the first return through hole 424 of lower outer sleeve 422 through shape memory filter sand tube 423, and then enters the clamping cavity, separating sealing ball 420 from lower ball seat 421. The extracted fluid enters the fluid extraction device 4 through the inner hole of lower ball seat 421 of each return component, the inner hole of sealing sleeve 419, the first collection through hole 425, and the second collection through hole 426. Under the action of the oil pump, the fluid is extracted to the surface, completing the extraction of the formation to be extracted.

[0098] Then, following the above method, the mining of other layers to be mined is completed step by step from bottom to top.

[0099] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. An acidizing and sand-controlling oil production tubing string, characterized in that: Includes a first plug (1), a first tubing (2), a first casing (3), several first layer packers (5), a suspended release packer (6), and a fluid collection device (4); The first plug (1) is located at the bottom, the first layered packer (5) is placed between the upper and lower oil layers, the suspended release packer (6) is placed at the top of the uppermost oil layer, and each sampling device (4) is located in an oil layer. The first plug (1), the first layered packer (5), the suspended release packer (6), and the sampling device (4) are all connected through the first oil pipe (2) and are placed inside the first sleeve (3). The inner diameter of the upper ball seat (410) of each sampling device (4) gradually decreases from top to bottom. The liquid collection device (4) includes an upper component and a lower component; The upper assembly includes an upper connector (401), an adjusting sleeve (403), a central tube (406), a valve (408), an upper ball seat (410), a sealing tube (414), and a connector (412). The central axes of the inner holes of the upper connector (401), the adjusting sleeve (403), the central tube (406), the valve (408), the upper ball seat (410), the sealing tube (414), and the connector (412) are all on the same vertical straight line. The inner wall of the upper connector (401) is threaded to the outer wall of the upper end of the central tube (406), and the adjusting sleeve (403) is threaded to the outer wall of the upper connector (401). The adjusting sleeve (403) is provided with an anti-rotation pin (402) embedded in the upper connector (401). The outer wall of the lower end of the central tube (406) is threaded to the inner wall of the upper end of the connector (412). The outer wall of the connector (406) is fitted with a valve (408), and the upper outer wall of the connector (412) is fitted with a corrosion-resistant sealing sleeve (411), the top of which contacts the valve (408); the central tube (406) is fitted with a spring ring (405) and a gasket ring (404), the lower end of which contacts the valve (408), and the upper end of which contacts the gasket ring (404). 404) The top end contacts the adjusting sleeve (403); the central tube (406) has an injection hole (400) below the valve (408), and an upper ball seat (410) is fixed on the inner wall of the central tube (406) by a shear pin. The upper ball seat (410) seals the injection hole (400), thereby forming a cavity between the corrosion-resistant sealing sleeve (411), the valve (408), the central tube (406), and the connector (412); The lower assembly includes an upper outer sleeve (413), a sealing tube (414), and a lower outer sleeve (422). The central axes of the inner holes of the upper outer sleeve (413), the sealing tube (414), and the lower outer sleeve (422) are all on the same straight line as the central axis of the inner hole of the upper connector (401). The outer diameter of the lower end of the upper outer sleeve (413) is larger than the outer diameter of the rest of its portion, and the inner diameter of the lower end of the upper outer sleeve (413) is larger than the inner diameter of the rest of its portion. The inner wall of the upper end of the upper outer sleeve (413) is aligned with the lower end of the connector (412). The outer wall of the lower outer sleeve (422) is threaded; a shape memory filter tube (423) is provided on the outer wall of the lower outer sleeve (422), the outer diameter of the upper end of the lower outer sleeve (422) is larger than the outer diameter of the rest of the lower outer sleeve (422), and the inner diameter of the upper end of the lower outer sleeve (422) is larger than the inner diameter of the rest of the lower outer sleeve (422); the radial inner circumferential surface of the lower end of the upper outer sleeve (413) and the radial inner circumferential surface of the lower end of the lower outer sleeve (422) are threaded to the outer wall of the sealing tube (414); the lower end of the upper outer sleeve (413) is threaded to the upper end of the lower outer sleeve (422), thereby forming a shape memory filter tube (423) on the upper outer sleeve (413) and the lower outer sleeve (422). A cavity is formed between the outer sleeve (422) and the sealing tube (414); one or more sets of return-out assemblies are vertically arranged inside the cavity; each return-out assembly includes, from top to bottom, a battery (415), a circuit (416), a motor (417), a sealing sleeve (419), and a lower ball seat (421); the bottom end of the lower ball seat (421) contacts the top surface of the inner diameter of the inner hole of the lower outer sleeve (422), and the lower end of the motor (417) is provided with a lifting sealing rod (418), the lower end of which is inserted into the sealing sleeve (419). Inside the inner hole of 419; a sealing ball (420) is provided on the inner hole of each lower ball seat (421); several third collection through holes (424) are provided below the lower ball seat (421) of the lower outer sleeve (422); a first collection through hole (425) is provided directly below the motor (417) above each lower ball seat (421) of the sealing tube (414); a second collection through hole (426) is provided on each sealing sleeve (419) that is closest to the sealing sleeve (419), and the second collection through hole (426) is connected to the first collection through hole.

2. The acidizing sand control tubing string as described in claim 1, characterized in that: The number of liquid collection devices (4) is 2-6.

3. The acidizing sand control oil production tubing string as described in claim 1, characterized in that: The suspended drop-out packer is a Y445 packer.

4. The acidizing sand control oil production tubing string as described in claim 1, characterized in that: The first layer packer is the Y341 packer.

5. The construction method of the acidizing sand control oil production tubing as described in any one of claims 1-4, characterized in that, Includes the following steps: An upper ball seat sealing ball is inserted, which is sealed to the inner hole of the upper ball seat (410) of the fluid extraction device (4) corresponding to the lowest stratum to be extracted. Acid is injected into the first oil pipe (2) by starting the pump on the ground. After the fluid extraction device (4) reaches a certain pressure, the upper ball seat sealing ball cuts the shear pin (409), and the upper ball seat (410) falls down, realizing the opening of the injection through hole (400). The injected acid enters from the injection through hole (400), lifts the valve (408), and the acid enters the stratum to start acidification. After the pump stops, the valve (408) automatically closes under the action of the spring ring (405) to prevent the stratum from backflowing. The shape memory filter pipe (423) expands and fills the space between the first oil pipe (2) and the first sleeve (3) to achieve a layered sand prevention effect; When liquid is needed, the system is turned on at a set time by a pre-programmed program on the host computer or by a pressure pulse device on the ground. Under the control of the circuit (416), the motor (417) drives the sealing rod (418) to move upward. The extracted liquid enters the third collection through hole (424) of the lower outer sleeve (422) through the shape memory filter sand tube (423), and then enters the clamping cavity to separate the sealing ball (420) from the lower ball seat (421). The extracted liquid enters the liquid collection device (4) through the inner hole of the lower ball seat (421) of each return assembly, the inner hole of the sealing sleeve (419), the first collection through hole (425), and the second collection through hole (426). Under the action of the oil pump, the liquid is collected to the ground, thus completing the mining of the stratum to be mined. Then, following the above method, the mining of other layers to be mined is completed step by step from bottom to top.

6. The construction method of the acidizing sand control oil production tubing as described in claim 5, characterized in that: The shape memory filter tube (423) is activated by pumping in a stimulating liquid or by temperature sensing.

7. The construction method of the acidizing sand control oil production tubing as described in claim 6, characterized in that: The stimulating liquid is an aqueous solution of KCl.

8. A water injection oil production tubing string, characterized in that: Includes a second plug (10), a second tubing (20), a second casing (30), several second layer packers (50), a suspended packer (7), and a fluid sampling device (4); The second plug (10), the second layer packer (50), the suspended packer (7), and the fluid collection device (4) are all connected through the second oil pipe (20) and are placed inside the second sleeve (30); the second plug (10) is located at the bottom end, and the suspended packer (7) is located at the top end of the uppermost oil layer; the second layer packers (50) are respectively placed between the upper and lower oil layers, and each oil layer corresponds to a fluid collection device (4); the inner diameter of the upper ball seat (410) of each fluid collection device (4) gradually decreases from top to bottom; The liquid collection device (4) includes an upper component and a lower component; The upper assembly includes an upper connector (401), an adjusting sleeve (403), a central tube (406), a valve (408), an upper ball seat (410), a sealing tube (414), and a connector (412). The central axes of the inner holes of the upper connector (401), the adjusting sleeve (403), the central tube (406), the valve (408), the upper ball seat (410), the sealing tube (414), and the connector (412) are all on the same vertical straight line. The inner wall of the upper connector (401) is threaded to the outer wall of the upper end of the central tube (406), and the adjusting sleeve (403) is threaded to the outer wall of the upper connector (401). The adjusting sleeve (403) is provided with an anti-rotation pin (402) embedded in the upper connector (401). The outer wall of the lower end of the central tube (406) is threaded to the inner wall of the upper end of the connector (412). The outer wall of the connector (406) is fitted with a valve (408), and the upper outer wall of the connector (412) is fitted with a corrosion-resistant sealing sleeve (411), the top of which contacts the valve (408); the central tube (406) is fitted with a spring ring (405) and a gasket ring (404), the lower end of which contacts the valve (408), and the upper end of which contacts the gasket ring (404). 404) The top end contacts the adjusting sleeve (403); the central tube (406) has an injection hole (400) below the valve (408), and an upper ball seat (410) is fixed on the inner wall of the central tube (406) by a shear pin. The upper ball seat (410) seals the injection hole (400), thereby forming a cavity between the corrosion-resistant sealing sleeve (411), the valve (408), the central tube (406), and the connector (412); The lower assembly includes an upper outer sleeve (413), a sealing tube (414), and a lower outer sleeve (422). The central axes of the inner holes of the upper outer sleeve (413), the sealing tube (414), and the lower outer sleeve (422) are all on the same straight line as the central axis of the inner hole of the upper connector (401). The outer diameter of the lower end of the upper outer sleeve (413) is larger than the outer diameter of the rest of its portion, and the inner diameter of the lower end of the upper outer sleeve (413) is larger than the inner diameter of the rest of its portion. The inner wall of the upper end of the upper outer sleeve (413) is aligned with the lower end of the connector (412). The outer wall of the lower outer sleeve (422) is threaded; a shape memory filter tube (423) is provided on the outer wall of the lower outer sleeve (422), the outer diameter of the upper end of the lower outer sleeve (422) is larger than the outer diameter of the rest of the lower outer sleeve (422), and the inner diameter of the upper end of the lower outer sleeve (422) is larger than the inner diameter of the rest of the lower outer sleeve (422); the radial inner circumferential surface of the lower end of the upper outer sleeve (413) and the radial inner circumferential surface of the lower end of the lower outer sleeve (422) are threaded to the outer wall of the sealing tube (414); the lower end of the upper outer sleeve (413) is threaded to the upper end of the lower outer sleeve (422), thereby forming a shape memory filter tube (423) on the upper outer sleeve (413) and the lower outer sleeve (422). A cavity is formed between the outer sleeve (422) and the sealing tube (414); one or more sets of return-out assemblies are vertically arranged inside the cavity; each return-out assembly includes, from top to bottom, a battery (415), a circuit (416), a motor (417), a sealing sleeve (419), and a lower ball seat (421); the bottom end of the lower ball seat (421) contacts the top surface of the inner diameter of the inner hole of the lower outer sleeve (422), and the lower end of the motor (417) is provided with a lifting sealing rod (418), the lower end of which is inserted into the sealing sleeve (419). Inside the inner hole of 419; a sealing ball (420) is provided on the inner hole of each lower ball seat (421); several third collection through holes (424) are provided below the lower ball seat (421) of the lower outer sleeve (422); a first collection through hole (425) is provided directly below the motor (417) above each lower ball seat (421) of the sealing tube (414); a second collection through hole (426) is provided on each sealing sleeve (419) that is closest to the sealing sleeve (419), and the second collection through hole (426) is connected to the first collection through hole.

9. The water injection oil production tubing string as described in claim 8, characterized in that: The number of liquid collection devices (4) is 2-6.

10. The water injection oil production tubing string as described in claim 8, characterized in that: The valve (408) and the outside of the central tube (406), the upper ball seat (410) and the inside of the central tube (406), the upper outer sleeve (413) and the sealing tube (414), the upper outer sleeve (413) and the lower outer sleeve (422), the sealing sleeve (419) and the inner wall of the lower outer sleeve (422) and the outer wall of the sealing tube (414) are all sealed with rubber rings.

11. The water injection oil production tubing string as described in claim 8, characterized in that: Mechanical seals are provided between the corrosion-resistant sealing sleeve (411) and the valve (408), between the sealing rod (418) and the sealing sleeve (419), and between the sealing ball (420) and the sealing sleeve (419).

12. The construction method of the water injection oil production tubing string as described in any one of claims 8-11, characterized in that, Includes the following steps: An upper ball seat sealing ball is inserted, which is sealed to the inner hole of the upper ball seat (410) of the fluid collection device (4) corresponding to the lowest stratum to be mined. Water is injected into the second oil pipe (20) by starting the pump on the ground. After the fluid collection device (4) reaches a certain pressure, the upper ball seat sealing ball cuts the shear pin (409), and the upper ball seat (410) falls down, realizing the opening of the injection through hole (400). The injected water enters from the injection through hole (400), lifts the valve (408), and enters the stratum. After the pump stops, it automatically closes under the action of the spring ring (405) of the valve (408). When oil extraction is required, the system is activated in advance by a pre-programmed program or by a pressure pulse device on the ground. Under the control of the circuit (416), the motor (417) drives the sealing rod (418) to move upward, so that the third collection through hole (424) is connected to the inner hole of the lower ball seat (421). The oil enters the third collection through hole (424) of the lower outer sleeve (422) through the shape memory filter sand tube (423), and then enters the clamping cavity to separate the sealing ball (420) from the lower ball seat (421). The extracted liquid enters the liquid extraction device (4) through the inner hole of the lower ball seat (421) of each return assembly, the inner hole of the sealing sleeve (419), the first collection through hole (425), and the second collection through hole (426). Under the action of the oil pump, the liquid is extracted to the ground, thus completing the extraction of the formation to be extracted. Then, following the above method, the mining of other layers to be mined is completed step by step from bottom to top.

13. The construction method of the water injection oil production tubing string as described in claim 12, characterized in that: After water injection is completed, when sand prevention is required, the shape memory filter pipe (423) expands to fill the space between the second oil pipe (20) and the second casing (30) to achieve a layered sand prevention effect.

14. The construction method of the water injection oil production tubing string as described in claim 13, characterized in that: The shape memory filter tube (423) is activated by pumping in a stimulating liquid or by temperature sensing.

15. The construction method of the water injection oil production tubing string as described in claim 14, characterized in that: The stimulating liquid is an aqueous solution of KCl.

Images