Tool capable of achieving full bore after pressing by intelligently opening multiple sliding sleeves and tool construction method

Abstract

The invention relates to the technical field of unconventional oil and gas reservoir exploitation, in particular to a tool capable of achieving full bore after intelligent opening of multiple sliding sleeves and a tool construction method, and aims to relieve the technical problem that the success rate is low when the sliding sleeves are opened in an intelligent mode in related technologies. According to the tool capable of achieving the full bore after the intelligent opening of the multiple sliding sleeves is pressed, when the first outer barrel is pressed, pressure acts on the first starting sliding sleeve, after a first fixing shear pin is cut off, the first starting sliding sleeve loses limitation, and the moving stroke is reserved for a first magnetic block; when the opening tool passes through the first magnetic block, the magnetic pole generated by the opening tool is the same as that generated by the inner end of the first magnetic block, the first magnetic block slides outwards in the radial direction of the first outer barrel, and therefore limitation to the inner sliding sleeve is relieved, the inner sliding sleeve slides by pressing the interior of the first outer barrel again, the through hole is not blocked any more, and the sliding sleeve assembly is opened. By means of the design, the influence of underground complex working conditions on sliding sleeve opening is effectively reduced, and the success rate of sliding sleeve opening is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of unconventional oil and gas reservoir exploitation, and particularly to a tool that can achieve full bore after intelligent opening of multiple sliding sleeves and a construction method of the tool. Background Art

[0002] At present, there are mainly two ways to open the sliding sleeve during the cementing sliding sleeve fracturing construction process. One is to open the sliding sleeve mechanically, and the other is to open the sliding sleeve intelligently.

[0003] There are mainly two main ways to open the sliding sleeve mechanically: One is to open the sliding sleeve by the conventional ball throwing method. After the construction of this method is completed, full bore cannot be achieved, which affects the subsequent operations. The other is to open the sliding sleeve by the dart throwing method. This method is equivalent to using one key to open one lock. Throwing a dart once can only open one sliding sleeve and cannot open multiple sliding sleeves at once.

[0004] When opening the sliding sleeve intelligently, the control system, transmission system, and power supply system are mainly installed inside the sliding sleeve and are lowered into the well together with the sliding sleeve during construction. The sliding sleeve is opened by sending a control signal from the wellhead. This method requires the power supply system to have good standby ability under high temperature and high pressure conditions in the well, and at the same time requires the control system and transmission system to have high working stability. However, affected by the high temperature and high pressure environment in the well, the reliability of the control system, transmission system, and power supply system will become lower and lower over time, thus seriously affecting the opening success rate of the sliding sleeve. Summary of the Invention

[0005] The purpose of the present invention is to provide a tool that can achieve full bore after intelligent opening of multiple sliding sleeves and a construction method of the tool, so as to alleviate the technical problem of low success rate of opening the sliding sleeve by the intelligent method in the related art.

[0006] In order to solve the above technical problem, the technical solution provided by the present invention is as follows:

[0007] In a first aspect, the present invention provides a tool that can achieve full bore after intelligent opening of multiple sliding sleeves, including: a sliding sleeve assembly and an opening tool;

[0008] The sliding sleeve assembly includes a first outer cylinder, an inner sliding sleeve, a first magnetic block, a first starting sliding sleeve, and a first fixed shear pin;

[0009] A through hole penetrating the side wall is provided on the first outer cylinder;

[0010] The inner sliding sleeve is arranged in the first outer cylinder in a posture of blocking the through hole and can slide along the axial direction of the first outer cylinder;

[0011] The first magnetic block is inserted and fitted with the first outer cylinder in the radial direction of the first outer cylinder, and abuts against the inner sliding sleeve in the axial direction of the first outer cylinder to limit the sliding of the inner sliding sleeve;

[0012] The first starting sliding sleeve is arranged between the inner wall of the first outer cylinder and the first magnetic block, and can slide along the axial direction of the first outer cylinder, and the first starting sliding sleeve abuts against the first magnetic block in the radial direction of the first outer cylinder;

[0013] The first fixing shear pin is fixed to the first outer cylinder and the first starting sliding sleeve in the radial direction of the first outer cylinder;

[0014] The opening tool is used to generate the same magnetic pole as the inner end of the first magnetic block.

[0015] Further, the first outer cylinder includes a first upper joint, a first body, and a first lower joint;

[0016] Both ends of the first body are respectively threadedly connected to the first upper joint and the first lower joint;

[0017] Along the circumferential direction of the first body, a first convex platform is formed by protruding the inner wall of the first body. A sliding path for the inner sliding sleeve is formed between the first convex platform and the end face of the first upper joint, and a sliding path for the first starting sliding sleeve is formed between the first convex platform and the step face of the first lower joint;

[0018] The first magnetic block is inserted between the first convex platform and the end face of the first lower joint.

[0019] Further, the sliding sleeve assembly further includes a first sealing rubber ring;

[0020] The through hole is arranged on the side wall of the first body. There are two groups of the first sealing rubber rings. The two groups of the first sealing rubber rings are distributed on both sides of the through hole and respectively abut against the inner wall of the first body and the outer wall of the inner sliding sleeve.

[0021] Further, the sliding sleeve assembly further includes a second sealing rubber ring and a third sealing rubber ring;

[0022] The second sealing rubber ring is sleeved on the first starting sliding sleeve and respectively abuts against the outer wall of the first starting sliding sleeve and the inner wall of the first body;

[0023] The third sealing rubber ring is sleeved on the first lower joint and respectively abuts against the outer wall of the first lower joint and the inner wall of the first starting sliding sleeve.

[0024] Further, the tool capable of achieving full-bore after the intelligent opening of the multi-sliding sleeve pressing further includes a closing valve, and the closing valve includes a second outer cylinder body, a sealing flap, a first elastic member, a control sliding sleeve, a second magnetic block, a second starting sliding sleeve, a second fixing shear pin, and a second elastic member;

[0025] One side of the sealing flap is hinged to the second outer cylinder body;

[0026] The first elastic member is connected between the sealing flap and the second outer cylinder body, so that the sealing flap has a tendency to rotate around the hinge axis towards the direction of blocking the internal passage of the second outer cylinder body;

[0027] The control sliding sleeve is arranged inside the second outer cylinder body and can slide along the axial direction of the second outer cylinder body;

[0028] The second magnetic block is inserted and matched with the second outer cylinder body along the radial direction of the second outer cylinder body and penetrates through the side wall of the control sliding sleeve, so that the sealing flap is sealed between the control sliding sleeve and the second outer cylinder body;

[0029] The second starting sliding sleeve is arranged between the inner wall of the second outer cylinder body and the second magnetic block and can slide along the axial direction of the second outer cylinder body, and the second starting sliding sleeve abuts against the second magnetic block in the radial direction of the second outer cylinder body;

[0030] The second fixing shear pin is fixed to the second outer cylinder body and the second starting sliding sleeve in the radial direction of the second outer cylinder body;

[0031] The second elastic member is connected between the control sliding sleeve and the second outer cylinder body, so that the control sliding sleeve has a tendency to slide away from the sealing flap;

[0032] The opening tool is used to generate the same magnetic pole as the inner end of the second magnetic block.

[0033] Further, the second outer cylinder body includes a second upper joint and a second body;

[0034] The second upper joint is threadedly connected to the second body;

[0035] The control sliding sleeve is slidably matched with the inner wall of the second body, and an annular groove is formed by enclosing the end face of the second upper joint and the inner wall of the second body at one end of the control sliding sleeve away from the sealing flap;

[0036] The opening tool is used to count the annular groove and is configured to generate a magnetic pole after the count reaches a preset value.

[0037] Further, the second outer cylinder body further includes a second lower joint;

[0038] The second lower joint is threadedly connected to an end of the second body away from the second upper joint;

[0039] Along the circumference of the second body, the inner wall of the second body protrudes to form a second boss;

[0040] The second magnetic block is inserted between the second boss and the end surface of the second lower joint;

[0041] The second starting sleeve is located between the second lower joint and the second body, and one end of the second starting sleeve is in contact with the second boss;

[0042] The sealing flap is located between the inner wall of the second lower joint and the outer wall of the control sleeve;

[0043] The second elastic member is a compression spring, which is sleeved on the control sleeve, has one end connected to an end of the control sleeve away from the sealing flap, and the other end connected to a side of the second boss away from the second magnetic block.

[0044] Furthermore, the opening tool includes an opening body and a power supply module, a detection control module and a solenoid arranged in the opening body, and the power supply module is electrically connected to the detection control module and the solenoid respectively.

[0045] Furthermore, the opening body includes a base and a pressure cap;

[0046] The base is provided with a blind cavity to place the power supply module and the detection control module;

[0047] The pressing cap is threadably connected to the base to block the opening of the blind cavity.

[0048] In a second aspect, the present invention further provides a tool construction method, which is based on the above-mentioned intelligent opening multi-sleeve pressing tool that can realize a full-diameter tool, and includes the following steps in sequence;

[0049] S1: Connect the float shoe, the float collar, the differential pressure sleeve, a plurality of closing valves, and a plurality of sleeve assemblies to the casing respectively, and lower them into the well. In the axial direction of the casing, the float shoe, the float collar, the differential pressure sleeve, the closing valve, and the sleeve assembly are sequentially distributed. The number of the closing valves corresponds to the number of the sleeve assemblies, and the closing valves are alternately distributed with each sleeve assembly.

[0050] S2: cementing construction;

[0051] S3: Pressurizing the inside of the casing to cut off the first fixed shear nail and the second fixed shear nail, and causing the first starting sliding sleeve and the second starting sliding sleeve to move downward;

[0052] S4: Continue to increase the fracturing pressure. When the pressure reaches the opening pressure of the differential pressure sleeve, cut the shear pins on the differential pressure sleeve, open the differential pressure sleeve, and perform fracturing construction on the corresponding layer of the differential pressure sleeve.

[0053] S5: After the fracturing construction is completed, an opening tool is put into the casing, and a detection control module of the opening tool detects annular grooves during movement. When the number of detected annular grooves reaches a preset value, the detection control module drives the power supply module to work, and the power supply module conducts current to the solenoid, so that the solenoid generates magnetic poles;

[0054] S6: Due to the principle of like-pole repulsion between the second magnetic block and the solenoid, the second magnetic block moves outward and separates from the control sleeve. Under the action of the second elastic member, the control sleeve moves upward.

[0055] S7: Pressurizing the inside of the casing, and under the action of the pressure, the inner sleeve moves downward, thereby realizing the opening of a set of the sleeve assemblies;

[0056] S8: After the sliding sleeve assembly is opened, fracturing construction is performed at the corresponding layer;

[0057] S9: After the fracturing construction is completed, steps S5 to S8 are repeated.

[0058] In summary of the above technical solutions, the technical effects that can be achieved by the tool for intelligently opening multiple sliding sleeves to realize full-diameter after pressing provided by the present invention are:

[0059] In the intelligent opening tool that can realize full-diameter after multi-sleeve pressure, when pressure is applied to the first outer cylinder, the pressure will act on the first starting sleeve. When the pressure reaches the shearing pressure of the first fixed shear pin, the first starting sleeve loses its restriction and slides along the axial direction of the first outer cylinder. In this way, the first magnetic block makes room for the moving stroke. When the opening tool passes through the first magnetic block, since the magnetic poles generated by the opening tool are the same as those at the inner end of the first magnetic block, the first magnetic block slides outward in the radial direction of the first outer cylinder under the principle of like poles repelling each other, thereby releasing the restriction on the inner sleeve. By applying pressure to the first outer cylinder again, the inner sleeve slides along the axial direction of the first outer cylinder and no longer blocks the through hole, so that the sleeve assembly is opened.

[0060] It can be seen that compared with the existing technology, the intelligent opening of multiple sleeves can realize full-diameter tools after pressure. The sleeve assembly is opened by pressure difference, and there is no control module and power supply module inside the sleeve, which effectively reduces the impact of complex downhole working conditions on the opening of the sleeve and ensures the success rate of the sleeve opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0062] Figure 1 Schematic application diagram of a tool that can achieve full bore after intelligent opening and multi-sliding sleeve pressing provided by an embodiment of the present invention;

[0063] Figure 2 Cross-sectional view of the sliding sleeve assembly when it is not opened provided by an embodiment of the present invention;

[0064] Figure 3 Cross-sectional view of the sliding sleeve assembly when it is opened provided by an embodiment of the present invention;

[0065] Figure 4 Cross-sectional view of the closing valve when it is not opened provided by an embodiment of the present invention;

[0066] Figure 5 Cross-sectional view of the closing valve when it is opened provided by an embodiment of the present invention;

[0067] Figure 6 Cross-sectional view of the opening tool provided by an embodiment of the present invention.

[0068] Icons: 100 - sliding sleeve assembly; 110 - first outer cylinder; 120 - inner sliding sleeve; 130 - first magnetic block; 140 - first starting sliding sleeve; 150 - first fixed shear pin; 160 - first sealing rubber ring; 170 - second sealing rubber ring; 180 - third sealing rubber ring; 111 - through hole; 112 - first upper joint; 113 - first body; 114 - first lower joint; 115 - first boss;

[0069] 200 - opening tool; 210 - opening body; 220 - power supply module; 230 - detection and control module; 240 - solenoid; 250 - instruction transmission line; 260 - current transmission line; 211 - base; 212 - compression cap;

[0070] 300 - closing valve; 310 - second outer cylinder; 320 - sealing flap; 330 - first elastic member; 340 - control sliding sleeve; 350 - second magnetic block; 360 - second starting sliding sleeve; 370 - second fixed shear pin; 380 - second elastic member; 311 - second upper joint; 312 - second body; 313 - annular groove; 314 - second lower joint; 315 - second boss;

[0071] 400 - float shoe; 500 - float collar; 600 - differential pressure sliding sleeve; 700 - casing. Detailed implementation manners

[0072] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0073] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0074] The following will describe in detail some implementation manners of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0075] The intelligent method for opening the sliding sleeve mainly installs the control system, the transmission system and the power supply system in the sliding sleeve, and they are lowered into the well together with the sliding sleeve during construction. The sliding sleeve is opened by sending control signals from the wellhead. This method requires that the power supply system has good standby ability under high temperature and high pressure conditions in the well, and at the same time requires that the control system and the transmission system have high working stability. However, affected by the high temperature and high pressure environment in the well, the reliability of the control system, the transmission system and the power supply system will become lower and lower over time, thus seriously affecting the success rate of opening the sliding sleeve.

[0076] In view of this, the present invention provides a tool that can achieve full bore after intelligent opening of multiple sliding sleeves, including a sliding sleeve assembly 100 and an opening tool 200; the sliding sleeve assembly 100 includes a first outer cylinder 110, an inner sliding sleeve 120, a first magnetic block 130, a first starting sliding sleeve 140, and a first fixed shear pin 150; a through hole 111 penetrating the side wall is provided on the first outer cylinder 110; the inner sliding sleeve 120 is arranged in the first outer cylinder 110 in a posture of blocking the through hole 111 and can slide along the axial direction of the first outer cylinder 110; the first magnetic block 130 is inserted and matched with the first outer cylinder 110 along the radial direction of the first outer cylinder 110 and abuts against the inner sliding sleeve 120 in the axial direction of the first outer cylinder 110 to limit the sliding of the inner sliding sleeve 120; the first starting sliding sleeve 140 is arranged between the inner wall of the first outer cylinder 110 and the first magnetic block 130 and can slide along the axial direction of the first outer cylinder 110, and the first starting sliding sleeve 140 abuts against the first magnetic block 130 in the radial direction of the first outer cylinder 110; the first fixed shear pin 150 is fixed to the first outer cylinder 110 and the first starting sliding sleeve 140 in the radial direction of the first outer cylinder 110; the opening tool 200 is used to generate the same magnetic pole as the inner end of the first magnetic block 130.

[0077] In this tool that can achieve full bore after intelligent opening of multiple sliding sleeves, when pressure is applied into the first outer cylinder 110, the pressure will act on the first starting sliding sleeve 140. When the pressure reaches the shearing pressure of the first fixed shear pin 150, the first starting sliding sleeve 140 will lose its restriction and thus slide along the axial direction of the first outer cylinder 110. In this way, a moving stroke is vacated for the first magnetic block 130; when the opening tool 200 passes by the first magnetic block 130, since the magnetic pole generated by the opening tool 200 is the same as the inner end of the first magnetic block 130, the first magnetic block 130 will slide outward in the radial direction of the first outer cylinder 110 under the principle of like poles repelling each other, thereby releasing the restriction on the inner sliding sleeve 120. By applying pressure into the first outer cylinder 110 again, the inner sliding sleeve 120 will slide along the axial direction of the first outer cylinder 110 and no longer block the through hole 111, so that the sliding sleeve assembly 100 is opened.

[0078] It can be seen that compared with the prior art, when using this tool that can achieve full bore after intelligent opening of multiple sliding sleeves, the sliding sleeve assembly 100 is opened by differential pressure, and there is no control module and power supply module 220 inside the sliding sleeve, effectively reducing the influence of downhole complex working conditions on the opening of the sliding sleeve and ensuring the success rate of sliding sleeve opening.

[0079] The following combines Figures 1 to 6 to elaborate in detail on the structure and shape of the tool that can achieve full bore after intelligent opening of multiple sliding sleeves provided in this embodiment:

[0080] Regarding the sliding sleeve assembly 100, specifically:

[0081] Refer toFigure 2 and Figure 3 , the first outer cylinder 110 includes a first upper joint 112, a first body 113 and a first lower joint 114; along the circumferential direction of the first body 113, a first boss 115 is formed by protruding the inner wall of the first body 113; the first upper joint 112 is threadedly connected to the first body 113, and the inner sliding sleeve 120 is sleeved inside the first body 113; the first magnetic block 130 abuts against the first boss 115 and the lower end of the inner sliding sleeve 120, and the first magnetic block 130 interacts with the first body 113, the first starting sliding sleeve 140 and the first lower joint 114 to limit the inner sliding sleeve 120; the first starting sliding sleeve 140 is arranged between the first body 113 and the first lower joint 114, and its limit is realized through the first fixed shear pin 150; the first lower joint 114 is threadedly connected to the first body 113.

[0082] Continuing from the above, the sliding sleeve assembly 100 further includes a first sealing rubber ring 160, a second sealing rubber ring 170 and a third sealing rubber ring 180; a through hole 111 is arranged on the side wall of the first body 113, there are two groups of the first sealing rubber rings 160, and the two groups of the first sealing rubber rings 160 are distributed on both sides of the through hole 111 and respectively abut against the inner wall of the first body 113 and the outer wall of the inner sliding sleeve 120. The second sealing rubber ring 170 is sleeved on the first starting sliding sleeve 140 and respectively abuts against the outer wall of the first starting sliding sleeve 140 and the inner wall of the first body 113; the third sealing rubber ring 180 is sleeved on the first lower joint 114 and respectively abuts against the outer wall of the first lower joint 114 and the inner wall of the first starting sliding sleeve 140.

[0083] Furthermore, the tool that can achieve full bore after the intelligent opening of multiple sliding sleeves further includes a closing valve 300. Regarding the closing valve 300, specifically:

[0084] Refer to Figure 4 and Figure 5 , the closing valve 300 includes a second outer cylinder 310, a sealing flap 320, a first elastic member 330, a control sliding sleeve 340, a second magnetic block 350, a second starting sliding sleeve 360, a second fixed shear pin 370 and a second elastic member 380. Among them, the second outer cylinder 310 includes a second upper joint 311, a second body 312 and a second lower joint 314. The first elastic member 330 can be a torsion spring, and the second elastic member 380 can be a compression spring.

[0085] Continuing from the above, specifically, the second upper joint 311 and the second body 312 are connected by threads. The control sleeve 340 is sleeved inside the body. Along the circumferential direction of the second body 312, a second boss 315 protrudes from the inner wall of the second body 312. The compression spring is sleeved on the control sleeve 340, with its lower end connected to the upper end of the second boss 315 and its upper end connected to the top end of the control sleeve 340. The second magnetic block 350 is inserted into the control sleeve 340 and abuts against the lower end of the second boss 315. The second magnetic block 350 realizes the limit of the control sleeve 340 through the interaction of the second body 312, the second starting sleeve 360, and the second lower joint 314. The second starting sleeve 360 is arranged between the second body 312 and the second lower joint 314 and is limited by the second fixing shear pin 370. The sealing flap 320 is hinged to the second lower joint 314 through a rotating shaft. The torsion spring is sleeved on the rotating shaft, and its two torsion feet are respectively connected to the sealing flap 320 and the second lower joint 314. The second lower joint 314 is threadedly connected to the second body 312.

[0086] Regarding the opening tool 200, specifically:

[0087] Reference Figure 6 , the opening tool 200 includes an opening body 210 and a power supply module 220, a detection and control module 230, and a solenoid 240 arranged inside the opening body 210. The opening body 210 includes a base 211 and a compression cap 212.

[0088] Continuing from the above, specifically, the detection and control module 230 is installed at the central position of the base 211. The power supply module 220 is sleeved inside the inner circumference of the base 211. The detection and control module 230 and the power supply module 220 transmit signals through an instruction transmission line 250. The solenoid 240 is installed on the base 211. The power supply module 220 and the solenoid 240 conduct current through a current conduction line 260. The compression cap 212 is threadedly connected to the base 211. The detection and control module 230 and the power supply module 220 are fixed within the space between the compression cap 212 and the base 211.

[0089] When the intelligent multi-sleeve full-bore tool after pressing is applied, the float shoe 400, the float collar 500, the differential pressure sleeve 600, the closure valve I, several sleeves, the closure valve II, and several sleeves are respectively connected to the casing 700 and lowered into the well (taking two sets of closure valves 300 and sleeves as an example for illustration, as Figure 1 shown), and then cementing construction is carried out. After the cementing construction is completed, the fracturing construction is prepared as follows:

[0090] First, pressure is applied to the sleeve 700, and the pressure acts on the second starting sleeve 360 ​​and the first starting sleeve 140 respectively. When the pressure reaches the shearing pressure of the first fixed shear pin 150 and the second fixed shear pin 370, the first fixed shear pin 150 and the second fixed shear pin 370 are sheared. At this time, under the action of pressure, the second starting sleeve 360 ​​and the first starting sleeve 140 move downward respectively, thereby freeing the movement range of the second magnetic block 350 and the first magnetic block 130.

[0091] Following the above, the pressure is further increased. When the pressure reaches the opening pressure of the differential pressure sleeve 600, the shear pins on the differential pressure sleeve 600 are cut off, the differential pressure sleeve 600 is opened, and the fracturing construction of the corresponding layer of the differential pressure sleeve 600 is carried out. After the fracturing construction of this section is completed, the fracturing construction of the corresponding layers of the closing valve I and the several sleeve assemblies 100 in front of the closing valve I is carried out, and the opening tool 200 is put into use. The detection control module 230 on the opening tool 200 detects the annular grooves 313 on the closing valve 300 during the movement. When the number of the detected annular grooves 313 reaches the number of the closing valve 300 before the closing valve I, the opening tool 200 is ready to open the sleeve assembly 100. Specifically, the detection control module 230 firstly makes the power supply module 220 work through the command transmission line 250. After the power supply module 220 starts working, the current is transmitted to the solenoid 240 through the current transmission line 260, and the solenoid 240 generates a magnetic pole. The magnetic pole generated at this time is the same as the magnetic pole at the inner end of the magnetic block. Therefore, after the opening tool 200 works, when it passes through the sleeve 1-1 to the sleeve 1-n, due to the principle of like poles repelling each other, the first magnetic block 130 is pushed to move outward. Once the first magnetic block 130 moves outward, the inner sleeve 120 loses its limit. Constraint can generate a movement trend; when the opening tool 200 passes through the closing valve I, due to the principle of like poles repelling each other, the second magnetic block 350 is pushed to move outward. When the second magnetic block 350 moves to the inner wall of the second body 312, the control sleeve 340 loses its constraint and moves upward under the action of the compression spring. When the control sleeve 340 moves to the second upper joint 311, the sealing flap 320 rotates around the rotation axis under the action of the torsion spring. When the sealing flap 320 rotates to completely contact the second lower joint 314, a seal is formed. Figure 5 shown.

[0092] Continuing with the above, the pressure in the pipe column is increased, and the sliding sleeves 1-1 to 1-n that are no longer constrained by the first magnetic block 130, due to the difference in cross-sectional area between the upper and lower ends of the inner sliding sleeve 120, move downward under the action of pressure, thereby releasing the blockage of the through hole 111 and realizing the opening of the sliding sleeves 1-1 to 1-n. Figure 3As shown. After the sliding sleeve is opened, the fracturing construction of the corresponding layer is carried out. After the construction of this layer section is completed, the construction of the corresponding layers of the closing valve II and the sliding sleeves 2-1 to 2-n is carried out according to the above method. After the construction is completed, since the sealing flap 320 and the compression cap 212 and the base 211 on the opening tool 200 are made of soluble materials and can be degraded by themselves underground, the pipe string can achieve full bore, providing an internal bore guarantee for other operations in the later stage.

[0093] The present invention has the following advantages compared with the existing tools:

[0094] 1. There is no limit on the number of stages for fracturing construction, and the fracturing transformation is more sufficient.

[0095] 2. Compared with the existing intelligent opening sliding sleeves, this intelligent sliding sleeve can open multiple sliding sleeves by inserting the opening tool 200 once.

[0096] 3. The sliding sleeve is opened by the pressure difference method, and there is no requirement for the minimum distance between the sliding sleeves, which is more conducive to the transformation within the section.

[0097] 4. The detection control module 230 and the power supply module 220 are both arranged in the opening tool 200, and there is no control module and power supply module 220 in the sliding sleeve, effectively reducing the influence of downhole complex working conditions on the opening of the sliding sleeve.

[0098] 5. After the fracturing construction of the opening tool 200 and the sealing flap 320 is completed, they can be dissolved by themselves, and the pipe string achieves full bore, which is beneficial to other operations in the later stage.

[0099] 6. The opening tool 200 counts by detecting the annular groove 313 in the closing valve 300, and there is no need to set up a separate counting mechanism, which has strong practicability.

[0100] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An intelligent tool that can achieve full bore after the multi-sliding sleeve is pressed and opened, characterized in that Comprising: A sliding sleeve assembly (100) and an opening tool (200); The sliding sleeve assembly (100) includes a first outer cylinder (110), an inner sliding sleeve (120), a first magnetic block (130), a first starting sliding sleeve (140), and a first fixing shear pin (150); A through hole (111) penetrating the side wall is provided on the first outer cylinder (110); The inner sliding sleeve (120) is arranged in the first outer cylinder (110) in a posture of blocking the through hole (111) and can slide along the axial direction of the first outer cylinder (110); The first magnetic block (130) is inserted into the first outer cylinder (110) in the radial direction of the first outer cylinder (110) and abuts against the inner sliding sleeve (120) in the axial direction of the first outer cylinder (110) to limit the sliding of the inner sliding sleeve (120); The first starting sliding sleeve (140) is arranged between the inner wall of the first outer cylinder (110) and the first magnetic block (130) and can slide along the axial direction of the first outer cylinder (110), and the first starting sliding sleeve (140) abuts against the first magnetic block (130) in the radial direction of the first outer cylinder (110); The first fixing shear pin (150) is fixed to the first outer cylinder (110) and the first starting sliding sleeve (140) in the radial direction of the first outer cylinder (110); The opening tool (200) is used to generate the same magnetic pole as the inner end of the first magnetic block (130).

2. The tool according to claim 1, which can achieve full bore after intelligent opening of multiple sliding sleeves and pressing, is characterized in that, The first outer cylinder (110) includes a first upper joint (112), a first body (113), and a first lower joint (114); Both ends of the first body (113) are respectively threadedly connected to the first upper joint (112) and the first lower joint (114); Along the circumferential direction of the first body (113), a first boss (115) protrudes from the inner wall of the first body (113). A sliding path of the inner sliding sleeve (120) is formed between the first boss (115) and the end face of the first upper joint (112), and a sliding path of the first starting sliding sleeve (140) is formed between the first boss (115) and the step face of the first lower joint (114); The first magnetic block (130) is inserted between the first boss (115) and the end face of the first lower joint (114).

3. The tool according to claim 2, which can achieve full bore after the intelligent opening of multiple sliding sleeves is pressed, is characterized in that, The sliding sleeve assembly (100) further includes a first sealing rubber ring (160); The through hole (111) is provided on the side wall of the first body (113). There are two groups of the first sealing rubber rings (160). The two groups of the first sealing rubber rings (160) are distributed on both sides of the through hole (111) and respectively abut against the inner wall of the first body (113) and the outer wall of the inner sliding sleeve (120).

4. The tool according to claim 3, which can achieve full bore after intelligent opening and multi-sliding sleeve pressing, is characterized in that, The sliding sleeve assembly (100) further includes a second sealing rubber ring (170) and a third sealing rubber ring (180); The second sealing rubber ring (170) is sleeved on the first starting sliding sleeve (140) and respectively abuts against the outer wall of the first starting sliding sleeve (140) and the inner wall of the first body (113); The third sealing rubber ring (180) is sleeved on the first lower joint (114) and is in contact with the outer wall of the first lower joint (114) and the inner wall of the first starting sliding sleeve (140) respectively.

5. The tool according to claim 1, which can achieve full bore after intelligent opening and multi-sliding sleeve pressing, is characterized in that, The tool that can achieve full bore after the intelligent opening multi-sliding sleeve is pressed further includes a closing valve (300), and the closing valve (300) includes a second outer cylinder body (310), a sealing flap (320), a first elastic member (330), a control sliding sleeve (340), a second magnetic block (350), a second starting sliding sleeve (360), a second fixed shear pin (370) and a second elastic member (380); One side of the sealing flap (320) is hinged to the second outer cylinder body (310); The first elastic member (330) is connected between the sealing flap (320) and the second outer cylinder body (310), so that the sealing flap (320) has a tendency to rotate around the hinge axis towards the direction of blocking the internal channel of the second outer cylinder body (310); The control sliding sleeve (340) is arranged in the second outer cylinder body (310) and can slide along the axial direction of the second outer cylinder body (310); The second magnetic block (350) is inserted into the second outer cylinder body (310) in the radial direction of the second outer cylinder body (310) and passes through the side wall of the control sliding sleeve (340), so that the sealing flap (320) is sealed between the control sliding sleeve (340) and the second outer cylinder body (310); The second starting sliding sleeve (360) is arranged between the inner wall of the second outer cylinder body (310) and the second magnetic block (350) and can slide along the axial direction of the second outer cylinder body (310), and the second starting sliding sleeve (360) abuts against the second magnetic block (350) in the radial direction of the second outer cylinder body (310); The second fixed shear pin (370) is fixed to the second outer cylinder body (310) and the second starting sliding sleeve (360) in the radial direction of the second outer cylinder body (310); The second elastic member (380) is connected between the control sliding sleeve (340) and the second outer cylinder body (310), so that the control sliding sleeve (340) has a tendency to slide away from the sealing flap (320); The opening tool (200) is used to generate the same magnetic pole as the inner end of the second magnetic block (350).

6. The tool capable of achieving full bore after intelligent opening and multi-sliding sleeve pressing according to claim 5, wherein The second outer cylinder body (310) includes a second upper joint (311) and a second body (312); The second upper joint (311) is threadedly connected to the second body (312); The control sliding sleeve (340) is slidably matched with the inner wall of the second body (312), and an annular groove (313) is formed by enclosing the end face of the second upper joint (311) and the inner wall of the second body (312) at one end of the control sliding sleeve (340) away from the sealing flap (320); The opening tool (200) is used to count the annular groove (313) and is configured to generate a magnetic pole after the count reaches a preset value.

7. The tool according to claim 6, which can achieve full bore after intelligent opening of multiple sliding sleeves and pressing, is characterized in that, The second outer cylinder body (310) further includes a second lower joint (314); The second lower joint (314) is threadedly connected to the end of the second body (312) away from the second upper joint (311); Along the circumferential direction of the second body (312), a second boss (315) is formed by protruding the inner wall of the second body (312); The second magnetic block (350) is inserted between the second boss (315) and the end face of the second lower joint (314); The second activation sliding sleeve (360) is between the second lower joint (314) and the second body (312), and one end thereof contacts the second boss (315); The sealing flap (320) is between the inner wall of the second lower joint (314) and the outer wall of the control sliding sleeve (340); The second elastic member (380) is a compression spring, the compression spring is sleeved on the control sliding sleeve (340), one end thereof is connected to the end of the control sliding sleeve (340) away from the sealing flap (320), and the other end is connected to the side of the second boss (315) facing away from the second magnetic block (350).

8. The tool capable of achieving full bore after intelligent opening and multi-sliding sleeve pressing according to any one of claims 1 to 7, characterized in that The opening tool (200) includes an opening body (210) and a power supply module (220), a detection and control module (230), and a solenoid (240) disposed in the opening body (210), and the power supply module (220) is electrically connected to the detection and control module (230) and the solenoid (240) respectively.

9. The tool according to claim 8, which can achieve full bore after intelligent opening of multiple sliding sleeves and pressing, is characterized in that, The opening body (210) includes a base (211) and a compression cap (212); The base (211) is provided with a blind cavity for placing the power supply module (220) and the detection and control module (230); The compression cap (212) is threadedly connected to the base (211) to block the opening of the blind cavity.

10. A tool construction method, characterized in that, Based on the tool according to any one of claims 1 to 9, which can achieve full bore after intelligent opening and multiple sliding sleeves are pressed, the following steps are included in sequence: S1: Connect the float shoe (400), the float collar (500), the differential pressure sliding sleeve (600), multiple shut-off valves (300), and multiple sets of sliding sleeve assemblies (100) to the casing (700) respectively, and lower them into the well. And in the axial direction of the casing (700), the float shoe (400), the float collar (500), the differential pressure sliding sleeve (600), the shut-off valve (300), and the sliding sleeve assembly (100) are distributed in sequence. The number of the shut-off valves (300) corresponds one by one to the number of sets of the sliding sleeve assemblies (100), and the shut-off valve (300) and each set of the sliding sleeve assemblies (100) are alternately distributed; S2: Cementing construction; S3: Pressurize the casing (700) to cut the first fixed shear pin (150) and the second fixed shear pin (370), and the first activation sliding sleeve (140) and the second activation sliding sleeve (360) move downward; S4: Continuously increase the pressurizing pressure. When the pressure reaches the opening pressure of the differential pressure sliding sleeve (600), cut the shear pin on the differential pressure sliding sleeve (600), and the differential pressure sliding sleeve (600) opens, and fracturing construction of the corresponding layer of the differential pressure sliding sleeve (600) is carried out; S5: After the fracturing operation is completed, an opening tool (200) is inserted into the casing (700). During the movement of the opening tool (200), the detection and control module (230) thereof detects the annular groove (313). When the number of detected annular grooves (313) reaches a preset value, the detection and control module (230) drives the power supply module (220) to operate. The power supply module (220) conducts current to the solenoid (240), causing the solenoid (240) to generate magnetic poles. S6: Due to the principle of like poles repelling each other, the second magnetic block (350) moves outward from the solenoid (240) and disengages from the control sleeve (340). Under the action of the second elastic member (380), the control sleeve (340) moves upward. S7: Pressure is applied into the casing (700). Under the action of the pressure, the inner sleeve (120) moves downward to open a set of the sleeve assemblies (100). S8: After the sleeve assembly (100) is opened, the fracturing operation for the corresponding formation is carried out. S9: After the fracturing operation is completed, steps S5 to S8 are repeated.

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