A multifunctional integrated pipe string and method for completing and increasing production in ultra-deep and thick reservoirs

Abstract

The present invention discloses a multifunctional integrated pipe string and method for completing and increasing production in ultra-deep and thick reservoirs. The pipe string of the present invention only needs to be set once for each level of packers, which solves the problem of repeated setting of packers leading to failure of rubber tube seal; one trip of the pipe string can achieve the two purposes of high-temperature and high-pressure deep well stratified fracturing and completion production, with a short construction period and high production efficiency; depending on the reservoir conditions of the oil and gas well, corresponding levels of telescopic pipes, hydraulically controlled two-way soluble packers, hydraulic anchors and fracturing sleeves can be lowered to achieve multi-layer pressure division. After the pressure is released, the hydraulic anchor retracts under the action of the internal spring, the hydraulic anchor is easy to unblock, the soluble block in the hydraulically controlled two-way soluble packer will dissolve by itself, the sealing rubber tube rebounds, and the packer is easy to unseal; fracturing construction is carried out step by step at each reservoir section, which can effectively test the sealing performance of each level of packers and prevent the layer from affecting the fracturing construction.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and natural gas exploitation, and in particular to a multifunctional integrated pipe string and method for completing and increasing production of ultra-deep and extremely thick reservoirs. Background Art

[0002] The exploration and development of conventional oil and gas reservoirs in my country has gradually shifted to deep and complex oil and gas reservoirs, which are characterized by deep burial, strong heterogeneity, high formation fracture pressure, and high temperature. The difficulty of increasing production and transformation is great, which puts higher demands on production-increasing and transformation tools.

[0003] Conventional stratified fracturing tool strings have the following problems in high-pressure reservoir reconstruction:

[0004] 1. In high temperature and high pressure wells, the packer is repeatedly set, which reduces the performance of the sealing rubber sleeve and causes the packer seal to fail;

[0005] 2. There are few pressure-dividing layers and many trips to run the pipe string, which results in a long construction period and low production efficiency;

[0006] 3. After the fracturing operation is completed, the tools are easily buried in the sand or stuck in the sand, which makes it difficult to lift the pipe string and unblock it;

[0007] These deficiencies make it difficult for conventional stratified fracturing tool strings to meet the needs of stratified production increase and transformation in deep and complex oil and gas reservoirs, becoming a difficult problem that needs to be solved urgently. Summary of the invention

[0008] The purpose of the present invention is to solve some deficiencies in the prior art and to provide a multifunctional integrated tubing string and method for ultra-deep and thick reservoir completion and production increase. A multi-stage hydraulically controlled bidirectional soluble packer, a telescopic pipe, a fracturing sleeve and a hydraulic anchor are short-connected with each other. Each stage of the packer only needs to be set once, and one trip of the tubing string can achieve the two purposes of high-temperature and high-pressure deep well stratified fracturing and completion production. The construction period is short and the production efficiency is high, which solves the problem of repeated setting of the packer causing failure of the rubber sleeve seal.

[0009] The technical solution of the patent of the present invention is: a multifunctional integrated tubing string for ultra-deep and thick reservoir completion and production increase, including an oil pipe, a downhole safety valve, a permanent packer and a multi-section telescopic pipe, a hydraulic anchor, a fracturing sleeve, a hydraulically controlled bidirectional soluble packer, and a sealing ball seat, a screen pipe, and a round-head guide shoe connected in sequence from top to bottom; the downhole safety valve and the permanent packer are close to the wellhead and fixedly arranged on the oil pipe.

[0010] The telescopic tube is mainly composed of an upper joint, an outer tube, a pressure cap, a sealing component, a core shaft, a key sleeve, a guide key, a shear pin and a lower joint. The core shaft is provided with a sealing component and a displacement groove. The sealing component is composed of a V-shaped sealing ring made of fluororubber and a stack of metal sealing rings. The guide key cooperates with the displacement groove and is installed on the key sleeve to limit the circumferential rotation and axial expansion and contraction of the core shaft. The shear pin is installed on the key sleeve and the core shaft. Under the action of hydraulic pressure, the shear pin is cut off, and the telescopic tube moves axially, so that each level of fracturing sliding sleeve reaches the designated operating position.

[0011] The hydraulic anchor is mainly composed of a shell, a slip base, a fixed pressure plate, a tungsten steel anchor and a reset spring. Three groups of slips are evenly distributed on the shell in a circumferential direction. The reset spring is arranged in the slip base. The fixed pressure plate is arranged above the slip base and is connected to the shell by bolts to fix the slip base. Four tungsten steel anchors are inlaid on the slip base. Under the action of hydraulic pressure, the slip base is radially displaced to the anchor casing. At this time, the reset spring is in a compressed state. After the pressure is released, the slip base retracts under the action of the spring, and the hydraulic anchor is unstuck.

[0012] The fracturing sleeve is mainly composed of upper joint 2, sleeve, outer tube 2, guide pin, fracturing ball, shear pin 2, ball seat and lower joint 2. A guide groove is provided on the surface of the inner sleeve. The guide pin is connected to the outer tube 2 and cooperates with the guide groove to limit the circumferential rotation and axial displacement of the sleeve. Before operation, the sleeve is connected to the outer tube 2 by shear pin 2. After the ball is thrown, the shear pin 2 breaks under the action of pressure, and the sleeve moves down to the surface through hole corresponding to the through hole of the outer tube 2, thereby opening the sandblasting channel.

[0013] The hydraulically controlled bidirectional soluble packer is mainly composed of an upper joint three, a shear outer tube, a core shaft three, a piston, a shear joint, a soluble block, a spacer ring, an isolation sleeve, a sealing rubber tube, an inner locking slip, a shear pin three and a lower joint three. The components of the packer are symmetrically arranged up and down. The upper joint three is connected to the shear outer tube by bolts. The four through holes on the surface of the upper joint three correspond to the hydraulic flow channels of the shear outer tube. The shear joint is connected to the shear outer tube by shear pin three. The piston is connected to the shear joint. The inner locking slip is located between the piston and the shear joint. The contact surface between the inner locking slip and the core shaft three is provided with a self-locking thread , limiting the unidirectional displacement of the inner locking slips. The second sealing component is composed of four sealing rubber cylinders, two soluble blocks, two spacer rings and an isolation sleeve, which are symmetrical from top to bottom. Under the hydraulic pressure of the central pipeline, the liquid enters the shear outer cylinder flow channel through the three-way holes of the upper and lower joints and acts on the piston surface, causing the shear pins to break. The upper and lower pistons move axially, driving the shear joints and soluble blocks to squeeze the middle sealing rubber cylinder. The sealing rubber cylinder expands due to the squeezing and fits tightly with the casing. At this time, the inner locking slips are self-locking to prevent the sealing rubber cylinder from rebounding. The packer completes the sealing and can achieve a good sealing effect. After the fracturing operation is completed, since the length of the soluble block is greater than the compression stroke of the rubber cylinder, the soluble block dissolves by itself, and the sealing rubber cylinder rebounds to achieve unsealing.

[0014] In addition, the present invention also aims to protect a method for using a multifunctional integrated tubular string for completing and increasing production in ultra-deep and thick reservoirs, comprising the following sequential steps:

[0015] 1) According to the reservoir conditions of the oil and gas wells, prepare the corresponding number of telescopic pipes, hydraulically controlled two-way soluble packers, hydraulic anchors and fracturing sleeves and assemble them on the oil pipe with the downhole safety valve, permanent packer, setting ball seat, screen pipe and round-head guide shoe to form an integrated pipe string;

[0016] 2) lowering the assembled pipe string into the wellbore of the oil and gas well;

[0017] 3) Insert the bottom fracturing ball;

[0018] 4) Hydraulic pressure is injected into the oil pipe, and the shear pins in the expansion pipes at all levels are broken, and the core shaft is axially displaced, driving the hydraulic anchor, fracturing sleeve, and hydraulically controlled bidirectional soluble packer to move downward to the positions of various reservoir sections in the oil and gas well;

[0019] 5) The inside of the oil pipe is in a pressurized state, the slip bases on each level of hydraulic anchors are radially displaced, the anchors are anchored into the casing, and the anchoring is completed. The upper and lower pistons in the packer squeeze the sealing rubber cylinder at the same time, and the packers at each level are set;

[0020] 6) A first-stage fracturing ball is put into the tubing string, which cooperates with the fracturing ball seat in the first-stage fracturing sleeve to complete the sealing, and then the pressure is continued. The shear pin 2 in the first-stage fracturing sleeve breaks, the sleeve moves downward, the sandblasting channel opens, and the fracturing fluid enters the first-stage layer from the sandblasting port to carry out fracturing construction;

[0021] 7) After the construction of the primary layer is completed, the secondary fracturing ball is put in. The diameter of the secondary fracturing ball is larger than that of the primary fracturing ball, and the ball seat in the secondary fracturing sleeve is tightly fitted to achieve sealing. At this time, the oil pipe of the primary layer is in a depressurized state, and the hydraulic anchor is unstuck. After the soluble block in the primary packer dissolves by itself, the sealing rubber cylinder rebounds, the packer is unsealed by itself, and the oil pipe of the secondary layer continues to be pressurized, and the fracturing process of the primary layer is repeated;

[0022] 8) Repeat step 6) for more layers to perform fracturing operations, so that while completing the step-by-step fracturing construction of the tubing string, each hydraulic anchor and the hydraulic-controlled bidirectional soluble packer are gradually unblocked; for example, after the third-stage fracturing ball is put in, the first-stage and second-stage hydraulic anchors are unblocked, and the fracturing construction of the third-stage layer begins.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: each level of the tubing string of the present invention only needs to be set once, which solves the problem of repeated setting of the packer leading to failure of the rubber tube seal; one trip of the tubing string can achieve the two purposes of high-temperature and high-pressure deep well stratified fracturing and completion production, with a short construction period and high production efficiency; depending on the reservoir conditions of the oil and gas well, corresponding levels of telescopic pipes, hydraulically controlled two-way soluble packers, hydraulic anchors and fracturing sleeves can be lowered to achieve multi-layer pressure division; after pressure relief, the hydraulic anchor retracts under the action of the internal spring, the hydraulic anchor is easy to unblock, the soluble block in the hydraulically controlled two-way soluble packer will dissolve by itself, the sealing rubber tube rebounds, and the packer is easy to unseal; fracturing construction is carried out step by step at each reservoir section, which can effectively test the sealing performance of each level of the packer and prevent the layer from affecting the fracturing construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 is a schematic diagram of the connection structure of the pipe string in an embodiment of the present invention;

[0026] Figure 2 This is a cross-sectional view of the overall structure of the hydraulically controlled bidirectional soluble packer of the present invention.

[0027] Figure 3 It is a schematic diagram of the overall structure of the telescopic tube of the present invention.

[0028] Figure 4 It is a schematic diagram of the overall structure of the hydraulic anchor of the present invention.

[0029] Figure 5 This is a cross-sectional view of the overall structure of the fracturing sleeve of the present invention.

[0030] In the figure, A—permanent packer, B—telescopic tube, C—fracturing sleeve, D—hydraulic anchor, E—hydraulic controlled two-way soluble packer, F—seating ball seat, G—screen, H—round head guide shoe, I—downhole safety valve, E1—upper joint three, E2—shear outer cylinder, E3—core shaft three, E4—piston, E5—shear joint, E6—internal locking slip, E7—soluble block, E8—spacer ring, E9—isolation sleeve, E10—sealing rubber cylinder, E11—lower Joint three, D1—shell, D2—fixed pressure plate, D3—slip base, D4—reset spring, D5—tungsten steel anchor, B1—upper joint one, B2—outer cylinder one, B3—pressure cap, B4—core shaft one, B5—key sleeve, B6—guide key, B7—lower joint one, B8—sealing component one, C1—upper joint two, C2—sliding sleeve, C3—outer cylinder two, C4—guide pin, C5—frac ball, C6—ball seat, C7—lower joint two. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0034] The downhole safety valve, permanent packer, hydraulic anchor, fracturing sleeve, telescopic pipe, setting ball seat, screen pipe, round-head guide shoe and oil pipe involved in the present invention are all commonly used accessories in the well completion process and are available on the market.

[0035] Specific embodiments of the present invention:

[0036] Example:

[0037] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a multifunctional integrated tubular column for ultra-deep and thick reservoir completion and production increase in this embodiment includes an oil pipe, a downhole safety valve I, a permanent packer A and a multi-section telescopic pipe B, a hydraulic anchor D, a fracturing sleeve C, a hydraulically controlled bidirectional soluble packer E, and a sealing ball seat F, a screen pipe G, and a round-head guide shoe H, which are connected in sequence from top to bottom; the downhole safety valve and the permanent packer A are close to the wellhead and fixedly installed on the oil pipe.

[0038] The telescopic tube B is provided with a sealing component B and a displacement groove on the core shaft B4. The sealing component is composed of a V-shaped sealing ring made of fluororubber and a stack of metal sealing rings. The guide key B6 cooperates with the displacement groove and is installed on the key sleeve B5. The shear pin is installed on the key sleeve B5 and the core shaft B4. Under the action of hydraulic pressure, the shear pin is cut off, and the telescopic tube B moves axially, so that each level of fracturing sliding sleeve reaches the designated operating position.

[0039] The hydraulic anchor D has three groups of slips evenly distributed circumferentially on the shell D1, a reset spring D4 is arranged in the slip base D3, a fixed pressure plate D2 is arranged above the slip base D4, and is connected to the shell D1 by bolts to fix the slip base D3, and four tungsten steel anchors D5 are inlaid on the slip base D3. Under the action of hydraulic pressure, the slip base D3 radially displaces to the anchor casing, at which time the reset spring D4 is in a compressed state. After the pressure is released, the slip base D3 retracts under the action of the spring, and the hydraulic anchor D is unstuck.

[0040] The fracturing sleeve C has a guide groove on the surface of the inner sleeve C2. The guide pin C4 is connected to the outer cylinder C3 and cooperates with the guide groove to limit the circumferential rotation and axial displacement of the sleeve C2. Before operation, the sleeve C2 is connected to the outer cylinder C3 by the shear pin. After the ball is thrown, the shear pin breaks under the pressure, and the sleeve C2 moves downward to the surface through hole corresponding to the through hole of the outer cylinder C3, thereby opening the sandblasting channel.

[0041] The hydraulically controlled bidirectional soluble packer has various parts symmetrically arranged in the upper and lower parts. The upper joint E1 is connected to the shear outer tube E2 by bolts. The four through holes on the upper joint surface correspond to the hydraulic flow channels of the shear outer tube E2. The shear joint E5 is connected to the shear outer tube E2 by shear pins. The piston E4 is connected to the shear joint E5. The inner locking slip E6 is located between the piston E4 and the shear joint E5. The contact surface between the inner locking slip E6 and the core shaft E3 is provided with a self-locking thread to limit the unidirectional displacement of the inner locking slip E6. The sealing component 2 is composed of four sealing rubber tubes E10 and two soluble blocks E7. , two spacer rings E8 and an isolation sleeve E9 are composed symmetrically up and down. Under the hydraulic pressure of the central pipeline, the liquid enters the flow channel of the shear outer cylinder E2 through the through holes of the upper joint E1 and the lower joint E11 and acts on the surface of the piston E4, causing the shear pin three to break, and the upper and lower pistons to move axially, driving the shear joint E5 and the soluble block E7 to squeeze the middle sealing rubber cylinder E10. The sealing rubber cylinder E10 expands due to the squeezing and fits tightly with the casing. At this time, the inner locking slip E6 is self-locking to prevent the sealing rubber cylinder E10 from rebounding. The packer E completes the setting and can achieve a good sealing effect. After the fracturing operation is completed, since the length of the soluble block E7 is greater than the compression stroke of the sealing rubber cylinder E10, the soluble block E7 dissolves by itself, and the sealing rubber cylinder E10 rebounds to achieve unsealing.

[0042] The method of using the multifunctional integrated pipe column of this embodiment is as follows:

[0043] 1) According to the reservoir conditions of the oil and gas well, prepare corresponding numbers of telescopic pipes B, hydraulically controlled two-way soluble packers E, hydraulic anchors D and fracturing sleeves C and assemble them on the oil pipe with downhole safety valves I, permanent packers A, setting ball seats F, screens G and round-head guide shoes H to form an integrated pipe string;

[0044] 2) lowering the assembled pipe string into the wellbore of the oil and gas well;

[0045] 3) Put in the bottom fracturing ball C5;

[0046] 4) Hydraulic pressure is injected into the oil pipe, the shear pins in the telescopic pipes B at each level are broken, and the core shaft B4 is axially displaced, driving the hydraulic anchor D, the fracturing sleeve C, and the hydraulically controlled bidirectional soluble packer E downward to the positions of the reservoir sections in the oil and gas well;

[0047] 5) The inside of the oil pipe is in a pressurized state, the slip base D3 on each level of hydraulic anchor D is radially displaced, the anchor is anchored into the casing, and the anchoring is completed. The upper and lower pistons E4 in the packer E squeeze the sealing rubber cylinder E10 at the same time, and the packers E at each level are set;

[0048] 6) A first-stage fracturing ball C5 is put into the tubing string to cooperate with the sealing ball seat C6 in the first-stage fracturing sleeve C to complete the sealing, and then the fracturing is continued. The shear pin 2 in the first-stage fracturing sleeve C breaks, the sleeve C2 moves downward, the sandblasting channel is opened, and the fracturing fluid enters the first-stage layer from the sandblasting port to carry out the fracturing construction;

[0049] 7) After the construction of the primary layer is completed, the secondary fracturing ball is put in. The diameter of the secondary fracturing ball is larger than that of the primary fracturing ball, and the ball seat in the secondary fracturing sleeve is tightly fitted to achieve sealing. At this time, the oil pipe of the primary layer is in a depressurized state, and the hydraulic anchor is unstuck. After the soluble block in the primary packer dissolves by itself, the sealing rubber cylinder rebounds, the packer is unsealed by itself, and the oil pipe of the secondary layer continues to be pressurized, and the fracturing process of the primary layer is repeated;

[0050] 8) Repeat step 6) for more layers, and gradually insert fracturing balls with a diameter larger than that of the previous layer to perform fracturing operations at each level. After completing the fracturing operations of the tubing string at each level, each hydraulic anchor and hydraulically controlled bidirectional soluble packer are released step by step.

[0051] The method of using the tubing string in the above embodiments is only a description of several feasible fracturing construction processes of the tubing string applied for the present invention, and is not intended to limit the invention. Any fracturing construction process that meets actual needs, as well as any equivalent replacement, improvement, etc. of the accessories therein during the fracturing construction process, are within the protection scope of the present invention.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multifunctional integrated pipe string for completing and increasing production in ultra-deep and thick reservoirs, comprising an oil pipe, a downhole safety valve (I), a permanent packer (A), a multi-section telescopic pipe (B), a hydraulic anchor (D), a fracturing sleeve (C), a hydraulically controlled bidirectional soluble packer (E), a setting ball seat (F), a screen pipe (G), and a round-head guide shoe (H) connected in sequence from top to bottom; the downhole safety valve (I) and the permanent packer (A) are close to the wellhead and fixedly arranged on the oil pipe; The telescopic tube (B) is mainly composed of an upper joint (B1), an outer tube (B2), a pressure cap (B3), a sealing component (B8), a core shaft (B4), a key sleeve (B5), a guide key (B6), a shear pin and a lower joint (B7). The core shaft (B4) is provided with a sealing component (B8) and a displacement groove. The sealing component (B8) is composed of a V-shaped sealing ring made of fluororubber and a stack of metal sealing rings. The guide key (B6) cooperates with the displacement groove and is installed on the key sleeve (B5) to limit the circumferential rotation and axial expansion and contraction of the core shaft (B4). The shear pin is installed on the key sleeve (B5) and the core shaft (B4). Under the action of hydraulic pressure, the shear pin is cut off, and the telescopic tube (B) moves axially, so that each level of fracturing sleeve (C) reaches the designated working position; The hydraulic anchor (D) is mainly composed of a shell (D1), a slip base (D3), a fixed pressure plate (D2), a tungsten steel anchor (D5) and a reset spring (D4). Three groups of slips are evenly distributed on the shell (D1). The reset spring (D4) is arranged in the slip base. The fixed pressure plate (D2) is arranged above the slip base (D3) and is connected to the shell (D1) by bolts to fix the slip base (D3). Four tungsten steel anchors (D5) are embedded on the slip base (D3). Under the action of hydraulic pressure, the slip base (D3) is radially displaced to the anchor casing. At this time, the reset spring (D4) is in a compressed state. After the pressure is released, the slip base (D3) retracts under the action of the spring, and the hydraulic anchor (D) is unstuck. The fracturing sleeve (C) is mainly composed of an upper joint (C1), a sleeve (C2), an outer cylinder (C3), a guide pin (C4), a fracturing ball (C5), a shear pin (C6), a ball seat (C6) and a lower joint (C7). A guide groove is provided on the surface of the inner sleeve (C2). The guide pin (C4) is connected to the outer cylinder (C3) and cooperates with the guide groove to limit the circumferential rotation and axial displacement of the sleeve (C2). Before operation, the sleeve (C2) is connected to the outer cylinder (C3) through the shear pin (C2). After the ball is thrown, the shear pin (C4) breaks under the action of pressure, and the sleeve (C2) moves downward to the surface through hole corresponding to the through hole of the outer cylinder (C3), thereby opening the sandblasting channel; The hydraulically controlled bidirectional soluble packer (E) is mainly composed of an upper joint (E1), a shear outer cylinder (E2), a core shaft (E3), a piston (E4), a shear joint (E5), a soluble block (E7), a spacer ring (E8), an isolation sleeve (E9), a sealing rubber tube (E10), an inner locking slip (6), a shear pin three and a lower joint (E11). The components of the packer (E) are symmetrically arranged up and down. The upper joint (E1) is connected to the shear outer cylinder (E2) by bolts. The four through holes on the surface of the upper joint (E1) correspond to the hydraulic flow channels of the shear outer cylinder (E2). The shear joint (E5) is connected to the shear outer cylinder (E2) by a shear pin three. The piston (E4) is connected to the shear joint (E5). The inner locking slip (6) is located between the piston and the shear joint (E5). The contact surface between the inner locking slip (6) and the core shaft (E3) is provided with a self-locking thread to limit the unidirectional displacement of the inner locking slip (6). The sealing component The second one is composed of four sealing rubber cylinders (E10), two soluble blocks (E7), two spacer rings (E8) and a spacer sleeve (E9) symmetrically from top to bottom. Under the hydraulic pressure of the central pipeline, the liquid enters the flow channel of the shear outer cylinder (E2) through the through holes of the upper joint three (E1) and the lower joint three (E11) and exerts pressure on the surface of the piston (E4), so that the shear pin three breaks, the upper and lower pistons (E4) move axially, and drive the shear joint (E5) and the soluble block (E7) to squeeze the middle sealing rubber cylinder (E10). The sealing rubber cylinder (E10) expands due to the squeezing and fits tightly with the casing. At this time, the inner locking slip (6) is self-locking to prevent the sealing rubber cylinder (E10) from rebounding. The packer (E) completes the sealing and can achieve a good sealing effect. After the fracturing operation is completed, since the length of the soluble block (E7) is greater than the compression stroke of the sealing rubber cylinder (E10), the soluble block (E7) dissolves by itself, and the sealing rubber cylinder (E10) rebounds to achieve unsealing.

2. A method for using a multifunctional integrated tubular column for completing and increasing production in ultra-deep and ultra-thick reservoirs, using the multifunctional integrated tubular column for completing and increasing production in ultra-deep and ultra-thick reservoirs as claimed in claim 1, characterized in that: The method comprises: 1) According to the reservoir conditions of the oil and gas well, prepare corresponding numbers of telescopic pipes (B), hydraulically controlled two-way soluble packers (E), hydraulic anchors (D) and fracturing sleeves (C) and assemble them on the oil pipe with downhole safety valves (I), permanent packers (A), setting ball seats (F), screens (G) and round-head guide shoes (H) to form an integrated pipe string; 2) lowering the assembled pipe string into the wellbore of the oil and gas well; 3) Insert the bottom fracturing ball (C5); 4) Hydraulic pressure is injected into the oil pipe, the shear pins in the expansion tubes (B) of each level are broken, the core shaft (B4) is axially displaced, and the hydraulic anchor (D), the fracturing sleeve (C), and the hydraulically controlled bidirectional soluble packer (E) are driven downward to the positions of the various reservoir sections in the oil and gas well; 5) The inside of the oil pipe is in a pressurized state, the slip base (D3) on each level of hydraulic anchor (D) is radially displaced, the anchor bolt is anchored into the casing, and the anchoring is completed. The upper and lower pistons (E4) in the packer (E) squeeze the sealing rubber cylinder (E10) at the same time, and the packers (E) at each level are set; 6) A first-stage fracturing ball (C5) is inserted into the tubing string, and cooperates with the sealing ball seat (C6) in the first-stage fracturing sleeve (C) to complete the sealing. Then, the pressure is continued, and the shear pin 2 in the first-stage fracturing sleeve (C) is broken, the sleeve (C2) moves downward, the sandblasting channel is opened, and the fracturing fluid enters the first-stage layer from the sandblasting port to carry out the fracturing construction; 7) After the construction of the primary layer is completed, the secondary fracturing ball is put in. The diameter of the secondary fracturing ball is larger than that of the primary fracturing ball, and it is tightly attached to the ball seat in the secondary fracturing sleeve to achieve sealing. At this time, the oil pipe of the primary layer is in a depressurized state, and the hydraulic anchor is unstuck. After the soluble block in the primary packer dissolves by itself, the sealing rubber cylinder rebounds, the packer is unsealed by itself, and the oil pipe of the secondary layer continues to be pressurized, and the fracturing process of the primary layer is repeated; 8) Repeat step 6) for more layers to perform fracturing operations. After completing the step-by-step fracturing operations of the tubing string, each hydraulic anchor and the hydraulically controlled bidirectional soluble packer are released step by step.

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