Intelligent water plugging screen pipe completion pipe string combination and using method thereof

Abstract

The invention discloses an intelligent water plugging screen pipe well completion pipe column combination and a using method thereof.The well completion pipe column combination comprises a well completion pipe column and an inner-layer screen pipe unlocking pipe column, and the well completion pipe column comprises a sleeve, a plurality of screen pipe assemblies and first packers which are arranged between the adjacent screen pipe assemblies and expand when encountering water; the screen pipe assembly comprises an outer-layer screen pipe with outer-layer screen holes and an inner-layer screen pipe with inner-layer screen holes, the inner-layer screen pipe and the outer-layer screen pipe are fixed through a screen pipe pin, the inner-layer screen holes and the outer-layer screen holes are aligned with each other, a first groove body and a second clamping groove are formed in the inner-layer screen pipe, and the inner-layer screen pipe unlocking pipe column comprises an oil pipe and an unlocking piece. The unlocking piece can be locked with the first groove body and the second groove body so as to drive the inner-layer screen pipe to move to the closing position where the inner-layer screen holes and the outer-layer screen holes are staggered through the inner-layer screen pipe unlocking pipe column. When water flows out of a wellhead, the inner-layer screen pipe is added to unlock the pipe column, the outer-layer screen holes are plugged, and fixed-point water plugging of the screen pipe is achieved.

Description

Technical Field

[0001] This invention relates to the field of oil and gas reservoir development technology, specifically to an intelligent water shut-off screen completion string assembly and its application method. Background Technology

[0002] Horizontal well screen completion offers advantages such as low cost, minimal pollution, and a large drainage area, making it the primary completion method for horizontal wells. However, with the continuous development of oil and gas fields, formation water often emerges after a period of production. If effective water shut-off measures are not taken, oil and gas well productivity will rapidly decline, or even lead to water flooding and production shutdown. Therefore, water shut-off in oil and gas wells is a crucial task in the oil and gas field development process.

[0003] Currently, mechanical water shut-off in oil and gas wells is mostly applied to casing completion strings. The water shut-off string tool is advanced downhole to the water-producing position via coiled tubing for sealing operations. This process is complex and time-consuming. Furthermore, the commonly used water shut-off string tool has an inner diameter of only 56mm, which is too small to achieve full-bore production. The difficulty in water shut-off in screen-completed horizontal wells lies in the fact that mechanical sealing methods can only seal the internal space of the screen, not the annular space between the screen and the wellbore. Current technology cannot achieve targeted mechanical water shut-off in screen-completed wells. Most screen-completed well water shut-off processes rely on chemical shut-off, which is detrimental to reservoir protection and has low long-term reliability. Therefore, designing a water shut-off tool that can achieve full-bore production, has a simple construction process, and is safe and reliable is of great significance. Summary of the Invention

[0004] One technical problem that this invention aims to solve is that existing technologies cannot achieve targeted mechanical water shut-off in well completions using screen pipes.

[0005] To achieve the above objectives, the present invention provides an intelligent water-shutting screen completion string assembly, comprising a completion string and an inner screen unlocking string. The completion string includes a casing, multiple screen assemblies, and a water-swellable first packer disposed between adjacent screen assemblies. Each screen assembly includes an outer screen with outer screen holes and an inner screen with inner screen holes. The inner and outer screens are fixed by screen pins, and the inner and outer screen holes are aligned with each other. The inner screen has a first groove and a second slot. The inner screen unlocking string includes tubing and an unlocking component. The unlocking component can lock with the first and second grooves to drive the inner screen to a closed position where the inner and outer screen holes are misaligned.

[0006] In some embodiments, the inner screen tube is provided with an axially extending slide bar, and the outer screen tube is provided with a slide groove to accommodate the slide bar.

[0007] In some embodiments, a spring limiter is provided at the end of the outer screen tube, which can restrict the axial movement of the inner screen tube away from the closed position.

[0008] In some embodiments, the inner sieve tube includes a bottom inner sieve tube, a middle inner sieve tube, and a top inner sieve tube.

[0009] In some embodiments, the unlocking element includes a chamfer at the lower end, a slit in the middle, and a first unlocking tooth and a second unlocking tooth on the outer periphery.

[0010] In some embodiments, the completion string includes, from bottom to top, a guide shoe, the screen assembly, a blind flange, a pressure-expanding second packer, and a stage clamp.

[0011] In some embodiments, the inner screen tube unlocking column includes, from bottom to top, the unlocking component, the threaded connector, the release device, and the reducing joint.

[0012] In some embodiments, the dropping device includes a dropping base and a locking portion connected to the dropping base by a dropping pin, the dropping base having a through hole that can be sealed by a soluble ball, and the locking portion being partially accommodated in a third groove of the dropping base.

[0013] In some embodiments, the drop base, the threaded connector, and the unlocking element are made of a soluble material.

[0014] A second aspect of the present invention provides a method for using an intelligent water-shutting screen completion string assembly, comprising:

[0015] Run the completion string, cement the well, and begin production;

[0016] When water begins to flow from one of the screen tube assemblies, the inner screen tube unlocking column is lowered, so that the unlocking member reaches the screen tube assembly at the water outlet position, and the unlocking member locks with the inner screen tube.

[0017] The inner screen tube is lifted to unlock the tubing so that it reaches the closed position, thereby blocking the water outlet section.

[0018] With the above technical solution, when water is produced at the wellhead, the first packer at the water outlet automatically expands and sets upon contact with water. After determining the water outlet point through the production profile, the inner screen tube unlocking string is added, opening the inner screen tube at the water outlet point. This causes the inner and outer screen tubes to misalign, resulting in the inner and outer screen holes being in their offset closed positions, thus sealing the outer screen holes and achieving targeted water plugging through the screen tubes. This sealing method does not occupy the internal space of the screen tubes, allowing for full-bore production from the wellbore. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the well completion string disclosed in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the screen tube assembly in the open state as disclosed in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the screen tube assembly in the closed state as disclosed in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the slide groove structure of the outer screen tube disclosed in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the inner sieve tube structure disclosed in an embodiment of the present invention;

[0025] Figure 6 This is a cross-sectional view of the screen tube assembly disclosed in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the inner screen tube unlocking column disclosed in an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the dropping device disclosed in the embodiment of the present invention in the dropping state.

[0028] Explanation of reference numerals in the attached figures

[0029] 1. Sleeve; 110. Vertical section; 120. Horizontal section; 130. Bending section; 2. First annular space; 3. Grading clamp; 4. Second packer; 5. Blind plate; 6. Screen tube assembly; 601. Outer screen tube; 6011. Top outer screen tube; 6012. Middle outer screen tube; 6013. Bottom outer screen tube; 602. Inner screen tube; 6021. Top inner screen tube; 6022. Middle inner screen tube; 6023. Bottom inner screen tube; 603. Slide groove; 604. Screen tube pin; 605. Screen hole; 6051. Outer screen hole; 6052. Inner screen hole; 60 6. First groove; 607. Second groove; 608. Spring limiter; 609. Sliding bar; 7. First packer; 701. Top screen tube section; 702. Middle screen tube section; 703. Bottom screen tube section; 8. Guide shoe; 9. Second annular space; 10. Unlocking component; 101. First unlocking tooth; 102. Second unlocking tooth; 103. Chamfer; 104. Cut; 11. Threaded connector; 12. Release device; 121. Engaging part; 122. Release base; 123. Release pin; 124. Third groove; 125. Soluble ball; 13. Reducing joint; 14. Oil pipe. Detailed Implementation

[0030] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0031] These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0032] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] Furthermore, the terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible range of error. "Parallel" is not strictly parallel, but within the permissible range of error. Terms such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0034] It should also be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0035] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0036] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0037] To address the problem of existing technologies failing to achieve targeted mechanical water shut-off in screen-tube well completions, this invention provides an intelligent water shut-off screen-tube well completion string assembly, comprising a completion string and an inner screen-tube unlocking string. The completion string includes a casing 1, multiple screen-tube assemblies 6, and a water-swellable first packer 7 disposed between adjacent screen-tube assemblies 6. Each screen-tube assembly 6 includes an outer screen tube 601 with outer screen holes 6051 and an inner screen tube 602 with inner screen holes 6052. 2. The outer screen tube 601 is fixed by the screen tube pin 604 and the inner screen hole 6052 and the outer screen hole 6051 are aligned with each other. The inner screen tube 602 is provided with a first groove 606 and a second slot 607. The inner screen tube unlocking column includes an oil pipe 14 and an unlocking component 10. The unlocking component 10 can be locked with the first groove 606 and the second groove 607 so that the inner screen tube 602 can be driven to move to the closed position where the inner screen hole 6052 and the outer screen hole 6051 are misaligned through the inner screen tube unlocking column.

[0038] like Figure 1-8 As shown, the screen assembly 6 includes an outer screen tube 601 with outer screen holes 6051 and an inner screen tube 602 with inner screen holes 6052. In the initial state, the outer screen holes 6051 and the inner screen holes 6052 are aligned to form screen holes 605, and the inner screen tube 602 is in the open position. The screen assembly 6 is lowered into the reservoir section of the well, and oil and gas can enter through the screen holes 605 for collection. It should be noted that the shape and size of the screen holes 605 can be adjusted according to the actual situation, but it is necessary to ensure that the horizontal distance between two adjacent screen holes 605 is greater than the maximum width of the screen holes 605 in the horizontal direction, so as to ensure that after the inner screen tube 602 and the outer screen tube 601 are misaligned, all inner screen holes 6052 and outer screen holes 6051 are in a blocked state.

[0039] When water begins to enter the reservoir section, the inner screen unlocking string can be lowered. Guided by the oil pipe 14, the unlocking element 10 reaches the screen assembly 6 at the water outlet position. The unlocking element 10 locks with the first groove 606 and the second groove 607 of the inner screen 602. The distribution of the first groove 606 and the second groove 607 of each inner screen 602 is different, and each has a unique unlocking element 10 corresponding to it. Lifting the inner screen opening key string allows the inner screen 602 to move upward, thereby cutting the screen pin 604, unlocking the inner screen 602, and causing the inner screen hole 6052 of the inner screen 602 to be misaligned with the outer screen hole 6051 of the outer screen 601, reaching the closed position. At this time, the screen assembly 6 at the water outlet position cannot be connected internally and externally, achieving a blockage. Figure 6 As shown, the screen tube pin 604 can be set at 135° and 315° positions of the outer screen tube 601.

[0040] In addition, a water-swellable first packer 7 can be installed between the screen tube assemblies 6. The first packer 7 not only serves to connect two adjacent screen tube assemblies 6, but also allows the first packer 7 to expand and seal in the second annular space 9 along the radial direction of the screen tube assembly 6 when water is produced in the reservoir section. After the first packers 7 at both ends of the screen tube assembly 6 expand and seal, this reservoir section can be isolated from other reservoir sections.

[0041] In some embodiments, the inner screen tube 602 is provided with an axial slide bar 609, and the outer screen tube 601 is provided with a slide groove 603 for accommodating the slide bar 609.

[0042] like Figure 2-6As shown, the slide groove 603 is located inside the outer screen tube 601, and the slide bar 609 is axially fixed above and outside the inner screen tube 602. After the inner screen tube 602 is unlocked, the slide bar 609 and the slide groove 603 cooperate to allow the slide bar 609 to drive the inner screen tube 602 to move axially without rotating relative to the outer screen tube 601. This prevents the inner screen hole 6052 of the inner screen tube 602 from accidentally aligning with the outer screen hole 6051 of the outer screen tube 601, thus ensuring the isolation between the inner and outer sides of the screen tube assembly 6. Figure 6 As shown, the slide groove 603 can be set at the 0° and 180° positions of the outer screen tube 601.

[0043] In some embodiments, a spring limiter 608 is provided at the end of the outer screen tube 601, which can restrict the inner screen tube 602 from axially moving away from the closed position.

[0044] refer to Figure 3 As shown, the pressure generated by the fluid inside the screen tube causes the inner screen tube 602 to displace horizontally. Therefore, a spring limiter 608 is provided to extend radially inward, thereby restricting the axial movement of the inner screen tube 602 to the bottom and returning it to the open position. In the closed position, the spring limiter 608 presses against the outer circumferential surface of the inner screen tube 602, as shown. Figure 2 As shown. Figure 6 As shown, two spring limiters 608 can be symmetrically arranged at the end of each outer sieve tube 601. For example, two spring limiters 608 can be arranged at 45° and 225° respectively.

[0045] In some embodiments, the inner sieve tube 602 includes a bottom inner sieve tube 6023, a middle inner sieve tube 6022, and a top inner sieve tube 6021.

[0046] like Figure 1-3 As shown, the screen tube assembly 6 can be composed of multiple screen tube segments, which can be divided into a top screen tube segment 701, a middle screen tube segment 702, and a bottom screen tube segment 703. The top screen tube segment 701 and the bottom screen tube segment 703 are both essential components, while the number of the middle screen tube segment 702 can be increased or decreased depending on the actual situation. The top screen tube segment 701 can be composed of a top inner screen tube 6021 and a top outer screen tube 6011; the bottom screen tube segment 703 can be composed of a bottom inner screen tube 6023 and a bottom outer screen tube 6013; and the middle screen tube segment 702 can be composed of a middle inner screen tube 6022 and a middle outer screen tube 6012. Adjacent screen tube segments are connected by bolts (not shown in the figure).

[0047] In addition, such as Figure 2-3As shown, the first tank 606 and the second tank 607 are disposed on the bottom inner layer screen tube 6023. The bottom inner layer screen tube 6023 and the bottom outer layer screen tube 6013 are of equal length, the middle inner layer screen tube 6022 and the middle outer layer screen tube 6012 are of equal length, and the length of the top inner layer screen tube 6021 is slightly less than the length of the top outer layer screen tube 6011. This length difference can be set as a first distance. The distance that the inner layer screen tube 602 moves from the initial state to the closed state is the first distance.

[0048] In some embodiments, the unlocking member 10 includes a chamfer 103 at the lower end, a slit 104 in the middle, and a first unlocking tooth 101 and a second unlocking tooth 102 on the outer periphery.

[0049] like Figure 7-8 As shown, the chamfer 103 guides the unlocking member 10 into the inner screen tube 602 or other tubular components, and the slit 104 allows the tubular unlocking member 10 to contract radially. The first unlocking tooth 101 can be accommodated in the first groove 606, and the second unlocking tooth 102 can be accommodated in the second groove 607, thereby locking the unlocking member 10 with the corresponding inner screen tube 602. Mechanical encoding can be performed by adjusting the size, distance, and groove angle of the first groove 606 and the second groove 607. Correspondingly, the size, distance, and tooth surface angle of the first unlocking tooth 101 and the second unlocking tooth 102 are adjusted to ensure successful decoding.

[0050] In some implementations, the completion string includes, from bottom to top, a guide shoe 8, a screen assembly 6, a blind flange 5, a pressure-expanding second packer 4, and a stage clamp 3.

[0051] like Figure 1 As shown, the blind flange 5, the second packer 4, and the stage clamp 3 are all spaced apart on the casing 1. The casing 1 may include a vertical section 110, a horizontal section 120, and a bent section 130. The blind flange 5 may be located at the end of the horizontal section 120 near the screen assembly 6, the second packer 4 may be located at the end of the horizontal section 120 away from the screen assembly 6, and the stage clamp 3 may be located on the bent section 130. After the second packer 4 is expanded and sealed, pressure can be applied to open the stage clamp 3 to inject cement slurry into the first annular space 2 of the casing 1 and the wellbore. After the cement slurry solidifies, a wellbore is formed.

[0052] In some embodiments, the inner screen tube opening key string includes, from bottom to top, an unlocking component 10, a threaded connector 11, a release device 12, and a reducing connector 13. The upper end of the reducing connector 13 is connected to an oil pipe 14.

[0053] In some embodiments, the dropping device includes a dropping base 122 and a locking portion 121 connected to the dropping base 122 by a dropping pin 123. The dropping base 122 has a through hole that can be sealed by a soluble ball 125. The locking portion 121 is partially accommodated in a third groove 124 of the dropping base 122.

[0054] The engaging part 121 is inserted into the drop-off base 122, and its lower end hooks into the middle groove 124. After the soluble ball 125 is inserted, the through hole is blocked. Pressurization can cut off the drop-off pin 124 on the drop-off base 122, and the engaging part 121 can be disengaged from the drop-off base 122 to allow the oil pipe 14, the reducing joint 13 and the shrinking structure 121 to be pulled out of the inner screen pipe 602.

[0055] In some embodiments, the release base 122, threaded connector 11, and unlocking component 10 are made of a soluble material. After the tubing 14, reducer 13, and locking part 121 are pulled out of the inner screen 602, the soluble ball 125, release base 122, threaded connector 11, and unlocking component 10 can dissolve, so that the screen assembly 6 remains connected, enabling full-bore production in the wellbore.

[0056] A second aspect of the present invention provides a method for using an intelligent water-shutting screen completion string assembly, comprising:

[0057] Run the completion string, cement the well, and begin production;

[0058] When water begins to flow from one of the screen tube assemblies 6, the inner screen tube unlocking column is lowered so that the unlocking part 10 reaches the screen tube assembly 6 at the water outlet position and locks the unlocking part 10 with the inner screen tube 602.

[0059] Raise the inner screen tube unlocking string so that the inner screen tube 602 reaches the closed position, thereby blocking the water outlet section.

[0060] The complete usage method of the intelligent water-blocking screen completion string assembly includes the following steps:

[0061] Step 1: Assemble the well casing. After the horizontal well is completed, connect the guide shoe 8, multiple screen pipe assemblies 6, blind flange 5, second packer 4, stage collar 3, and casing 1 sequentially from bottom to top, according to the actual situation. The multiple screen pipe assemblies 6 are connected by the first packer 7, and the blind flange 5, second packer 4, and stage collar 3 are all installed on the casing 1.

[0062] The length of the screen pipe assembly 6 is determined by the segment length of the horizontal well. The horizontal well is segmented according to the actual underground conditions, and the lengths of the screen pipe assemblies 6 may not be equal. In some specific embodiments, each screen pipe segment of the screen pipe assembly 6 can be set to 10 meters / piece.

[0063] Step 2: Complete the cementing of casing section 1. Close the blind flange 5, pressurize the wellhead to set the second packer 4 to seal the second annular space 9 between casing 1 and the formation. Continue pressurizing the wellhead and hold the pressure until it drops to zero to open the stage collar 3. Select the appropriate density and type of cement slurry according to the cementing design for cementing operations. The cement slurry flows into the first annular space 2 through the opening of the stage collar 3.

[0064] Step 3: After the slurry replacement is completed, close the stage hoop 3. After injecting clean water into the wellhead to completely replace the cement slurry in the well barrel, press it down. After the pressure stabilizes and does not drop, drain the water to cut off the flow, thereby closing the stage hoop 3 and sealing the first annular space 2, and wait for the cement slurry to solidify.

[0065] Step 4: Well Production to Water Production at the Wellhead. Utilizing a mature tool combination, such as coiled tubing with a bottom screw drill, drill blind flange, and other cementing accessories, ensure unobstructed flow within the wellbore and begin well production to water production at the wellhead.

[0066] Step 5: Conduct a water production profile test to determine the water outlet location.

[0067] Step Six: Assemble the inner screen unlocking string that matches the inner screen 602 at the outlet section. The connection method from bottom to top is as follows: unlocking component 10, threaded connector 11, hand device 12, reducing connector 13, and oil pipe 14.

[0068] Step 7: Lock the inner screen tube 602 and the unlocking component 10. After the oil pipe 14 is lowered to 50m above the water outlet section in Step 6, reduce the lowering speed of the oil pipe 14. After the first unlocking tooth 101 and the second unlocking tooth 102 identify the corresponding first groove 606 and second groove 607, the chamfer 103 returns to its original open state.

[0069] Step 8: Cut the pin 604 to achieve misalignment and sealing of the inner and outer screen pipes. Lift the inner screen pipe 602 and unlocking component 10, which are in the locked state, while observing the change in the wellhead tonnage gauge. When the tonnage gauge reading first rises and then falls, it indicates that the screen pipe pin 604 has been cut. Continue lifting the inner screen pipe 602 and unlocking component 10, which are in the locked state, causing the inner screen pipe 602 to move a first distance from the bottom to the top via the slide groove 603 until it is stopped by the spring limiter 608, and the tonnage gauge reading rises again. At this point, the outer screen hole 6051 on the outer screen pipe 601 and the inner screen hole 6052 on the inner screen pipe 602 are both sealed.

[0070] Step 9: Drop the soluble ball 125 to perform the release operation. Drop the soluble ball 125 at the wellhead, where it falls into the release base 122. Apply pressure at the wellhead to shear off the release pin 123. Raise the tubing 14, which will drive the reducer 13 and the locking part 121. The locking part 121 will retract from the third groove 124, thus completing the release.

[0071] Among them, the drop-off base 122, the threaded connection component 11, and the unlocking component 10 are all made of soluble materials.

[0072] Step 10: Retract the inner screen and unlock the tubing string to continue well production. If water production occurs again at the wellhead, repeat steps 5 through 9.

[0073] The various embodiments of the present invention have now been described in detail. To avoid obscuring the concept of the invention, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

[0074] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. A smart water-blocking screen completion string assembly, characterized in that, The well completion string includes a completion string and an inner screen unlocking string. The completion string includes a casing (1), multiple screen assemblies (6), and a water-swellable first packer (7) disposed between adjacent screen assemblies (6). The screen assembly (6) includes an outer screen (601) with an outer screen hole (6051) and an inner screen (602) with an inner screen hole (6052). The inner screen (602) and the outer screen (601) are fixed by screen pins (604), and the inner screen hole (6052) and the outer screen (601) are... The outer screen holes (6051) are aligned with each other. The inner screen tube (602) is provided with a first groove (606) and a second groove (607). The inner screen tube unlocking column includes an oil pipe (14) and an unlocking component (10). The unlocking component (10) can lock with the first groove (606) and the second groove (607) so that the inner screen tube (602) can be driven by the inner screen tube unlocking column to move to a closed position where the inner screen holes (6052) and the outer screen holes (6051) are misaligned.

2. The intelligent water-blocking screen and completion string assembly according to claim 1, characterized in that, The inner screen tube (602) is provided with an axially extending slide bar (609), and the outer screen tube (601) is provided with a slide groove (603) for accommodating the slide bar (609).

3. The intelligent water-blocking screen completion string assembly according to claim 2, characterized in that, The outer screen tube (601) is provided with a spring limiter (608) at its end, which can limit the axial movement of the inner screen tube (602) away from the closed position.

4. The intelligent water-blocking screen completion string assembly according to claim 3, characterized in that, The inner sieve tube (602) includes a bottom inner sieve tube (6023), a middle inner sieve tube (6022), and a top inner sieve tube (6021).

5. The intelligent water-blocking screen completion string assembly according to claim 4, characterized in that, The unlocking component (10) includes a chamfer (103) at the lower end, a slit (104) in the middle, and a first unlocking tooth (101) and a second unlocking tooth (102) on the outer periphery.

6. The intelligent water-blocking screen completion string assembly according to claim 5, characterized in that, The completion string includes, from bottom to top, a guide shoe (8), a screen assembly (6), a blind flange (5), a pressure-sealed second packer (4), and a staged clamp (3).

7. The intelligent water-blocking screen completion string assembly according to claim 6, characterized in that, The inner screen tube unlocking column includes, from bottom to top, the unlocking component (10), the threaded connector (11), the release device (12), and the reducing connector (13).

8. The intelligent water-blocking screen completion string assembly according to claim 7, characterized in that, The dropping device includes a dropping base (122) and a locking part (121) connected to the dropping base (122) by a dropping pin (123). The dropping base (122) has a through hole that can be sealed by a soluble ball (125). The locking part (121) is partially accommodated in a third groove (124) of the dropping base (122).

9. The intelligent water-blocking screen and completion string assembly according to claim 8, characterized in that, The drop-off base (122), the threaded connector (11), and the unlocking component (10) are made of a soluble material.

10. A method of using the intelligent water-blocking screen completion string assembly according to any one of claims 1-9, characterized in that, include: Run the completion string, cement the well, and begin production; When water begins to flow from one of the screen tube assemblies (6), the inner screen tube unlocking column is lowered so that the unlocking member (10) reaches the screen tube assembly (6) at the water outlet position and the unlocking member (10) locks with the inner screen tube (602). The inner screen tube unlocking column is lifted so that the inner screen tube (602) reaches the closed position, thereby blocking the water outlet section.

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