Multifunctional horizontal well fracturing packer

Abstract

The invention relates to the technical field of oil field fracturing tools, in particular to a multifunctional horizontal well fracturing packer which comprises a sand blasting body, a sealing seat, a sliding sleeve, an upper sealing positioning sleeve, a soluble rubber cylinder assembly, a lower sealing positioning sleeve, a retaining assembly, an elastic claw, a push cylinder, a sliding sleeve positioning cylinder, a hydraulic cylinder assembly and a lower connector. Sand blasting openings which are symmetrical left and right are formed in the circumference of the middle part of the sand blasting main body; and the upper end of the sliding sleeve is fixedly connected in the sand blasting main body above the sand blasting openings through sand blasting shear pins. According to the multifunctional horizontal well fracturing packer, large-diameter accessories such as the rubber barrel, the baffle ring, the supporting ring and the centralizing ring are made of soluble materials and are dissolved before pulling out of a hole, the outer diameter of the hole is reduced, and the risk of jamming of the hole is reduced; the upper portion of the packer is integrated with a sand blower, the number of well entering tools is reduced, the length of a tool string is reduced, the risk of drill jamming is reduced, the distance between a sand blasting opening and a soluble rubber cylinder of the packer is shortened, sand setting on the upper portion of the soluble rubber cylinder is reduced, timely dissolution of the rubber cylinder, a baffle ring and a supporting ring is facilitated, and the risk of drill jamming of the rubber cylinder is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield fracturing tools and is a multifunctional horizontal well fracturing packer. Background Art

[0002] After exploitation, low-permeability oilfields are faced with the problem of rapid decline in production and ineffective oil wells. For low-yield wells with incomplete reservoir transformation in the early stage of horizontal well development, repeated fracturing has become the main measure to effectively tap the potential of reservoirs and increase the production of single wells. An effective way to achieve repeated fracturing is to run a fracturing string with a mechanical packer in advance, use the packer to accurately locate the layer section that needs to be transformed, and accurately fractur. In specific implementation, generally speaking, if N layers need to be fractured, N packers and N side hole sandblasters, as well as downhole tools such as hydraulic anchors and safety joints must be run. By throwing the corresponding balls multiple times, the side hole sandblasters are opened one by one, and fracturing transformation is carried out layer by layer. However, due to the running of multiple large-diameter downhole tools in the horizontal section, the risk of drill bit stuck in the later stage is very high, and the overhaul after the drill bit is stuck is difficult, and it may even cause the oil and gas well to be scrapped. The high risk of drill sticking in horizontal well fracturing strings places higher requirements on the anti-sticking performance of fracturing tools. After analysis, it is found that the tool most prone to drill sticking is the fracturing packer. Therefore, it is necessary to design a horizontal well fracturing packer with strong anti-sticking ability. Summary of the invention

[0003] The present invention provides a multifunctional horizontal well fracturing packer, which overcomes the shortcomings of the above-mentioned prior art. It can effectively reduce the number of tools, and once the tools are stuck, they can be released, so that the risk of the pipe string getting stuck after fracturing is reduced. After the drill is stuck, the tools can be released step by step from the lower end of the packer, reducing the difficulty of salvage processing.

[0004] The technical scheme of the present invention is realized by the following measures: a multifunctional horizontal well fracturing packer, comprising a sandblasting body, a sealing seat, a sliding sleeve, an upper sealing positioning sleeve, a soluble gel tube assembly, a lower sealing positioning sleeve, a stop assembly, an elastic grip, a push tube, a sliding sleeve positioning tube, a hydraulic cylinder assembly and a lower joint, a sandblasting body is provided with a left-right symmetrical sandblasting port on the middle circumference, the upper end of the sliding sleeve is fixedly connected to the sandblasting body above the sandblasting port by a sandblasting shear nail, the sealing seat is sleeved on the inner side of the sandblasting body at the upper end of the sliding sleeve, a fracturing ball seat is provided on the inner side of the sliding sleeve at the sealing seat, and the sandblasting body is provided with a sandblasting ball seat. The inner side of the lower part of the sand body is fixedly installed together with the outer side of the upper part of the upper sealing positioning sleeve, the sealing sleeve at the lower end of the sliding sleeve is installed on the inner side of the sliding sleeve positioning tube, the lower end of the sliding sleeve positioning tube is fixedly installed together with the upper part of the hydraulic cylinder assembly, the lower part of the hydraulic cylinder assembly is fixedly installed together with the lower joint, and a push cylinder fixedly connected to the upper part of the hydraulic cylinder assembly is installed on the outer side of the sliding sleeve positioning tube, and a soluble rubber cylinder assembly and a stop assembly are installed from top to bottom on the outer side of the sliding sleeve between the upper sealing positioning sleeve and the push cylinder, and the lower sealing positioning sleeve and the elastic grip are fixedly installed between the soluble rubber cylinder assembly on the inner side of the stop assembly and the sliding sleeve positioning tube.

[0005] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned soluble rubber tube assembly includes a soluble support ring, at least two soluble baffle rings, a soluble rubber tube, a rubber tube center tube and an adjustment ring. The rubber tube center tube is sleeved on the outside of the sliding sleeve. The upper end outer side and the lower end outer side of the rubber tube center tube are respectively fixedly installed with the lower inner side of the upper sealing positioning sleeve and the upper inner side of the lower sealing positioning sleeve. The soluble baffle ring, the soluble rubber tube, the soluble baffle ring and the adjustment ring are sequentially sleeved on the outer side of the rubber tube center tube between the upper sealing positioning sleeve and the lower sealing positioning sleeve. A limiting ring platform is arranged on the outer side of the upper sealing positioning sleeve below the sandblasting body, and a soluble support ring is fixedly installed in the limiting ring platform.

[0006] The above-mentioned anti-recoil assembly includes a serrated anti-recoil ring, an anti-recoil guide shoe, a serrated outer cylinder, a soluble anti-recoil cylinder and an anti-recoil cylinder. Saw teeth with tooth tips facing downward are arranged on the inner side of the serrated outer cylinder, and a clamping tooth with the tooth tips facing upward and cooperating with the serrated teeth is arranged on the serrated anti-recoil ring. An outer ring surface which is wider at the top and narrower at the bottom is arranged on the outer side of the lower part of the serrated anti-recoil ring, and an inner ring platform corresponding to the outer ring surface is arranged on the inner side of the upper part of the anti-recoil guide shoe. The serrated outer cylinder is sleeved on the outer side of the lower sealing positioning sleeve between the soluble rubber cylinder assembly and the push cylinder, and a mounting recessed platform with an opening facing downward is arranged on the inner side of the lower part of the lower sealing positioning sleeve. The serrated anti-recoil ring, the anti-recoil guide shoe, the soluble anti-recoil cylinder and the anti-recoil cylinder are sleeved from top to bottom in the mounting recessed platform on the inner side of the serrated outer cylinder.

[0007] The above-mentioned cylinder assembly includes a primary piston outer cylinder, a piston inner cylinder, a positioning sleeve, a secondary piston outer cylinder and a piston. The outer side of the lower part of the piston inner cylinder is fixedly installed together with the inner side of the upper part of the lower joint, the inner side of the upper end of the piston inner cylinder is fixedly installed together with the inner side of the lower end of the sliding sleeve positioning cylinder, and the lower part of the secondary piston outer cylinder is fixedly installed on the upper outer side of the lower joint through a fixing pin. A boss abutting against the outer side of the sliding sleeve positioning cylinder is arranged on the inner side of the upper part of the primary piston outer cylinder, the top of the piston inner cylinder is adjacent to the bottom end of the boss, a gap is arranged between the top of the piston inner cylinder and the bottom end of the boss, an upper radial liquid through hole is arranged on the sliding sleeve positioning cylinder corresponding to the inside and outside of the gap, and a The length of the lower traveling recess is greater than the total length of the positioning sleeve and the piston, the positioning sleeve and the piston are located in the lower traveling recess from top to bottom, the positioning sleeve is fixedly connected to the secondary piston outer cylinder by a sealing pin, the upper outer side of the positioning sleeve is fixedly connected to the lower inner side of the primary piston outer cylinder, an injection recess is arranged on the lower inner side of the piston, a lower radial liquid through hole is arranged on the piston inner cylinder corresponding to the inside and outside of the injection recess, a lower drainage hole communicating with the lower traveling recess is arranged on the primary piston outer cylinder above the positioning sleeve, an upper traveling recess that meets the upward movement of the primary piston outer cylinder is arranged on the outer side of the sliding sleeve positioning cylinder above the primary piston outer cylinder, and an upper drainage hole communicating with the upper traveling recess is arranged on the lower part of the push cylinder.

[0008] A sleeve limit platform is arranged at the lower part of the above-mentioned sleeve positioning cylinder; a sleeve piston is fixedly installed at the bottom of the sleeve, an elastic grab is installed between the lower sealing positioning sleeve and the sleeve piston, and the elastic grab is fixedly connected to the upper end of the sleeve positioning cylinder by lifting and pulling shear pins, the shear strength of the locking pins is greater than the shear strength of the lifting and pulling shear pins, the shear strength of the lifting and pulling shear pins is greater than the shear strength of the sandblasting shear pins, and the shear strength of the sandblasting shear pins is greater than the shear strength of the sealing pins.

[0009] A soluble straightening ring is fixedly installed on the outer side of the lower joint below the secondary piston outer cylinder; threads are arranged on the upper and lower joints of the sandblasting body.

[0010] At least one sealing ring is arranged between the outer side of the upper end of the above-mentioned sliding sleeve and the inner side of the upper part of the sandblasting body, at least one sealing ring is arranged between the inner side of the upper sealing positioning sleeve and the outer side of the sliding sleeve, at least one sealing ring is arranged between the inner side of the upper sealing positioning sleeve and the outer side of the upper part of the center tube of the rubber sleeve, at least one sealing ring is arranged between the outer side of the bottom of the sliding sleeve and the inner side of the sliding sleeve piston, at least one sealing ring is arranged between the outer side of the sliding sleeve piston and the inner side of the upper part of the sliding sleeve positioning cylinder, at least one sealing ring is arranged between the outer side of the lower part of the sliding sleeve positioning cylinder and the inner side of the upper part of the first-level piston outer cylinder, at least one sealing ring is arranged between the outer side of the upper part of the piston inner cylinder and the inner side of the upper part of the first-level piston outer cylinder, at least one sealing ring is arranged between the inner side of the piston and the outer side of the lower part of the piston inner cylinder, at least one sealing ring is arranged between the outer side of the piston and the inner side of the lower part of the secondary piston outer cylinder, and at least one sealing ring is arranged between the outer side of the upper part of the lower joint and the inner side of the lower part of the secondary piston outer cylinder.

[0011] In the multifunctional horizontal well fracturing packer described in the present invention, large-diameter accessories such as rubber tubes, retaining rings, support rings and straightening rings are made of soluble materials and dissolved before drilling, thereby reducing the outer diameter of the drill and the risk of drill sticking. A sandblaster is integrated on the upper part of the packer to reduce the number of tools entering the well, reduce the length of the tool string, reduce the risk of drill sticking, and reduce the distance between the sandblasting port and the soluble rubber tube of the packer to reduce sand deposition on the upper part of the soluble rubber tube, which is conducive to the timely dissolution of the rubber tube, retaining ring and support ring, and reduces the risk of drill sticking. If drill sticking occurs, the rubber tube can be lifted up vigorously to be released, and the upper part including the rubber tube of the packer can be lifted out of the wellbore, and a salvage tool can be lowered to carry out the next step of salvage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 This is a schematic diagram of the main cross-sectional structure of the upper part of the multifunctional horizontal well fracturing packer.

[0013] Attached Figure 2 This is a schematic diagram of the main cross-sectional structure of the lower half of a multifunctional horizontal well fracturing packer.

[0014] Attached Figure 3 For attachment Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0015] Attached Figure 4 For attachment Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0016] Attached Figure 5 Schematic diagram of the enlarged structure of the elastic grip.

[0017] Attached Figure 6 The present invention is a schematic diagram of the structure of a mechanical segmented fracturing string for a horizontal well with a fixed string.

[0018] The codes in the attached drawings are: 1 is the sandblasting body, 2 is the sealing seat, 3 is the sliding sleeve, 4 is the upper sealing positioning sleeve, 5 is the lower sealing positioning sleeve, 6 is the elastic grip, 7 is the push cylinder, 8 is the sliding sleeve positioning cylinder, 9 is the lower joint, 10 is the sandblasting port, 11 is the fracturing ball, 12 is the sandblasting shear nail, 13 is the soluble support ring, 14 is the soluble retaining ring, 15 is the soluble rubber cylinder, 16 is the rubber cylinder center tube, 17 is the adjustment ring, 18 is the serrated backstop ring, 19 is the backstop guide shoe, 20 is the serrated outer cylinder, 21 is the soluble backstop cylinder, 22 is the backstop cylinder, 23 is the boss, 24 is the tightening pin, 2 5 is a primary piston outer cylinder, 26 is a piston inner cylinder, 27 is a positioning sleeve, 28 is a secondary piston outer cylinder, 29 is a piston, 30 is a lower drain hole, 31 is a lower travel concave platform, 32 is a sealing pin, 33 is a liquid injection concave platform, 34 is a lower radial liquid through hole, 35 is an upper travel concave platform, 36 is an upper drain hole, 37 is a sliding sleeve limit platform, 38 is a sliding sleeve piston, 39 is a lifting shear pin, 40 is a soluble straightening ring, 41 is a sealing ring, 42 is an upper radial liquid through hole, 43 is a fracturing oil pipe, 44 is a safety joint, 45 is a hydraulic anchor, 46 is a sealing bottom valve, and 47 is a packer. DETAILED DESCRIPTION

[0019] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0020] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 The layout direction is determined by the threaded connection. Fixed connection or fixed installation can be achieved by threaded connection.

[0021] The present invention will be further described below in conjunction with embodiments: Embodiment 1: As attached Figures 1 to 5As shown, the multifunctional horizontal well fracturing packer comprises a sandblasting body 1, a sealing seat 2, a sliding sleeve 3, an upper sealing positioning sleeve 4, a soluble gel tube assembly, a lower sealing positioning sleeve 5, a stop assembly, an elastic grip 6, a push tube 7, a sliding sleeve positioning tube 8, a cylinder assembly and a lower joint 9. The middle circumference of the sandblasting body 1 is provided with a left-right symmetrical sandblasting port 10. The upper end of the sliding sleeve 3 is fixedly connected to the sandblasting body 1 above the sandblasting port 10 through a sandblasting shear nail 12. The sealing seat 2 is sleeved on the inner side of the sandblasting body 1 at the upper end of the sliding sleeve 3. A fracturing ball seat is provided on the inner side of the sliding sleeve 3 at the sealing seat 2. The lower part of the sandblasting body 1 The inner side is fixedly installed together with the outer side of the upper sealing positioning sleeve 4, the lower end of the sliding sleeve 3 is sealingly installed on the inner side of the sliding sleeve positioning tube 8, the lower end of the sliding sleeve positioning tube 8 is fixedly installed together with the upper part of the cylinder assembly, and the lower part of the cylinder assembly is fixedly installed together with the lower joint 9, and a push cylinder 7 fixedly connected to the upper part of the cylinder assembly is installed on the outer side of the sliding sleeve positioning tube 8, and a soluble glue cylinder assembly and a stop assembly are installed from top to bottom on the outer side of the sliding sleeve 3 between the upper sealing positioning sleeve 4 and the push cylinder 7, and the lower sealing positioning sleeve 5 and the elastic grip 6 are fixedly installed between the soluble glue cylinder assembly on the inner side of the stop assembly and the sliding sleeve positioning tube 8.

[0022] Throwing the fracturing ball 11 to pressurize can cut off the sandblasting shear nails 12, and the sleeve 3 falls into the sleeve positioning tube 8, leaking the sandblasting port 10, and can perform sandblasting and fracturing normally. The inner diameter of the sleeve 3 of each level of the packer is different, decreasing from top to bottom, and the inner diameter of the sleeve 3 corresponds to the thrown ball one by one. The sandblasting body 1 is at the uppermost end of the packer and is also used as an upper joint. The sealing seat 2 is made of alloy wear-resistant material and has a strong sand-passing ability to protect the sandblasting body 1 and the sleeve 3 from being damaged by the sand-carrying fluid. The pressure difference when the ball hits the sleeve 3 is 8MPa to 10MPa.

[0023] The following are further optimizations and / or improvements to the above multifunctional horizontal well fracturing packer: Embodiment 2: As attached Figure 1 As shown, the soluble rubber tube assembly includes a soluble support ring 13, at least two soluble baffle rings 14, a soluble rubber tube 15, a rubber tube center tube 16 and an adjustment ring 17. The rubber tube center tube 16 is sleeved on the outside of the sliding sleeve 3. The upper end outer side and the lower end outer side of the rubber tube center tube 16 are respectively fixedly installed with the lower inner side of the upper sealing positioning sleeve 4 and the upper inner side of the lower sealing positioning sleeve 5. The soluble baffle ring 14, the soluble rubber tube 15, the soluble baffle ring 14 and the adjustment ring 17 are sequentially sleeved on the outer side of the rubber tube center tube 16 between the upper sealing positioning sleeve 4 and the lower sealing positioning sleeve 5. A limiting ring platform is arranged on the outer side of the upper sealing positioning sleeve 4 below the sandblasting body 1, and the soluble support ring 13 is fixedly installed in the limiting ring platform.

[0024] When the packer is set, the thrust is transmitted through the hydraulic cylinder to compress the soluble gel tube 15 to seal the casing annulus. After the fracturing operation is completed, the soluble support ring 13, the soluble gel tube 15 and the soluble retaining ring 14 can be slowly and completely dissolved.

[0025] Embodiment 3: As attached Figure 3 As shown, the backstop assembly includes a serrated backstop ring 18, a backstop guide shoe 19, a serrated outer cylinder 20, a soluble backstop cylinder 21 and a backstop cylinder 22. Saw teeth with tooth tips facing downward are arranged on the inner side of the serrated outer cylinder 20, and clamping teeth with tooth tips facing upward and cooperating with the serrated teeth are arranged on the serrated backstop ring 18. An outer annular surface that is wider at the top and narrower at the bottom is arranged on the outer side of the lower part of the serrated backstop ring 18, and an inner annular platform corresponding to the outer annular surface is arranged on the inner side of the upper part of the backstop guide shoe 19. The serrated outer cylinder 20 is sleeved on the outer side of the lower sealing positioning sleeve 5 between the soluble rubber cylinder assembly and the push cylinder 7, and a mounting recessed platform with an opening facing downward is arranged on the inner side of the lower part of the lower sealing positioning sleeve 5. The serrated backstop ring 18, the backstop guide shoe 19, the soluble backstop cylinder 21 and the backstop cylinder 22 are sleeved from top to bottom in the mounting recessed platform on the inner side of the serrated outer cylinder 20.

[0026] The dissolvable anti-retraction tube 21 is provided to ensure that after the packer is set, the serrated outer tube 20 is locked by the serrated anti-retraction ring 18 and the anti-retraction guide shoe 19, and the packer is not unsealed. After the fracturing operation is completed, the dissolvable anti-retraction tube 21 gradually dissolves, the serrated outer tube 20 is unlocked, and the packer is automatically unsealed.

[0027] Before setting, the upward serrated outer cylinder 20 is locked by the serrated stop ring 18, and the stop guide shoe 19 restricts the downward movement of the serrated stop ring 18, thereby preventing the serrated outer cylinder 20 from descending. After the serrated outer cylinder 20 ascends, the soluble stop cylinder 21 is exposed. When the soluble stop cylinder 21 dissolves, the stop guide shoe 19 loses its constraint, and the serrated outer cylinder 20 loses its constraint, and the serrated outer cylinder 20 is unlocked.

[0028] Embodiment 4: As attached Figure 2 , 4As shown, the cylinder assembly includes a primary piston outer cylinder 25, a piston inner cylinder 26, a positioning sleeve 27, a secondary piston outer cylinder 28 and a piston 29. The outer side of the lower part of the piston inner cylinder 26 is fixedly installed together with the inner side of the upper part of the lower joint 9, and the inner side of the upper end of the piston inner cylinder 26 is fixedly installed together with the inner side of the lower end of the sliding sleeve positioning cylinder 8. The lower part of the secondary piston outer cylinder 28 is fixedly installed on the upper outer side of the lower joint 9 through a fixing pin 24. A boss 23 that abuts against the outer side of the sliding sleeve positioning cylinder 8 is provided on the inner side of the upper part of the primary piston outer cylinder 25. The top of the piston inner cylinder 26 is adjacent to the bottom of the boss 23. A gap is provided between the top of the piston inner cylinder 26 and the bottom of the boss 23. An upper radial liquid through hole 42 is provided on the sliding sleeve positioning cylinder 8 corresponding to the inside and outside of the gap. A hole with a length greater than the positioning sleeve is provided below the middle of the outer side of the piston inner cylinder 26. The sleeve 27 and the piston 29 have a lower travel recess 31 of the total length. The positioning sleeve 27 and the piston 29 are located in the lower travel recess 31 from top to bottom. The positioning sleeve 27 is fixedly connected to the secondary piston outer cylinder 28 by a sealing pin 32. The upper outer side of the positioning sleeve 27 is fixedly connected to the lower inner side of the primary piston outer cylinder 25. A liquid injection recess 33 is arranged on the lower inner side of the piston 29. A lower radial liquid through hole 34 is arranged on the piston inner cylinder 26 corresponding to the inner and outer sides of the liquid injection recess 33. A lower drainage hole 30 communicating with the lower travel recess 31 is arranged on the primary piston outer cylinder 25 above the positioning sleeve 27. An upper travel recess 35 that meets the upward movement of the primary piston outer cylinder 25 is arranged on the outer side of the sliding sleeve positioning cylinder 8 above the primary piston outer cylinder 25. An upper drainage hole 36 communicating with the upper travel recess 35 is arranged at the lower part of the push cylinder 7.

[0029] The first-stage piston outer cylinder 25, the piston inner cylinder 26, the positioning sleeve 27, the second-stage piston outer cylinder 28 and the piston 29 form a two-stage hydraulic cylinder, which provides sufficient thrust to seal the packer. When the positioning sleeve 27 moves upward in the lower walking concave platform 31, the liquid in the lower walking concave platform 31 can be discharged from the lower walking concave platform 31 through the lower drain hole 30.

[0030] The packer unsealing pressure difference is 8MPa to 10MPa, and the sealing pin 32 is sheared off.

[0031] Embodiment 5: As attached Figure 1 , 2 As shown, a sleeve limit platform 37 is provided at the lower part of the sleeve positioning cylinder 8; a sleeve piston 38 is fixedly installed at the bottom of the sleeve 3, the elastic grip 6 is clamped between the lower sealing positioning sleeve 5 and the sleeve piston 38, and the elastic grip 6 is fixedly connected to the upper end of the sleeve positioning cylinder 8 by a lifting shear pin 39, the shear strength of the locking pin 24 is greater than the shear strength of the lifting shear pin 39, the shear strength of the lifting shear pin 39 is greater than the shear strength of the sandblasting shear pin 12, and the shear strength of the sandblasting shear pin 12 is greater than the shear strength of the sealing pin 32.

[0032] As attached Figure 5As shown, the gripper of the elastic gripper 6 grips outwardly on the inner thread of the sleeve positioning tube 8, and a sleeve piston 38 is installed in the small gap of the gripper to limit the retraction of the gripper and ensure the connection strength between the elastic gripper 6 and the sleeve positioning tube 8. When the sliding sleeve 3 is knocked down by the ball before fracturing, the sliding sleeve positioning tube 8 falls at the same time, so that the gripper of the elastic gripper 6 has enough space to shrink inward, and the gripper cannot grip the inner thread of the sliding sleeve positioning tube 8. The sandblasting body 1 is lifted up, and the upper sealing positioning sleeve 4, the rubber tube center tube 16, the lower sealing positioning sleeve 5 and the elastic gripper 6 are driven in turn, and the lifting and pulling shear pins 39 are pulled off. The lifting and releasing tonnage is adjustable from 10 tons to 30 tons, and the upper half of the packer can be lifted out, and the push tube 7, the sliding sleeve positioning tube 8 and the following components are left in the wellbore, and the salvage tool is lowered for salvage.

[0033] Embodiment 6: As attached Figure 1 As shown, a soluble straightening ring 40 is fixedly installed on the outer side of the lower joint 9 below the secondary piston outer cylinder 28; threads are provided on the sandblasting body 1 and the lower joint 9.

[0034] The soluble support ring 13 and the soluble straightening ring 40 play a role in straightening and protecting the soluble rubber tube 15 and the soluble retaining ring 14 of the packer. After the fracturing operation is completed, the soluble support ring 13 and the soluble straightening ring 40 can be slowly and completely dissolved.

[0035] Embodiment 7: As attached Figure 1 , 2 As shown, at least one sealing ring 41 is provided between the outer side of the upper end of the sliding sleeve 3 and the inner side of the upper part of the sandblasting body 1, at least one sealing ring 41 is provided between the inner side of the upper sealing positioning sleeve 4 and the outer side of the sliding sleeve 3, at least one sealing ring 41 is provided between the inner side of the upper sealing positioning sleeve 4 and the outer side of the upper part of the rubber tube center tube 16, at least one sealing ring 41 is provided between the outer side of the bottom of the sliding sleeve 3 and the inner side of the sliding sleeve piston 38, at least one sealing ring 41 is provided between the outer side of the sliding sleeve piston 38 and the inner side of the upper part of the sliding sleeve positioning tube 8, and the sliding sleeve positioning tube 8 At least one sealing ring 41 is provided between the outer side of the lower part and the inner side of the upper part of the first-stage piston outer tube 25, at least one sealing ring 41 is provided between the outer side of the upper part of the piston inner tube 26 and the inner side of the upper part of the first-stage piston outer tube 25, at least one sealing ring 41 is provided between the inner side of the piston 29 and the outer side of the lower part of the piston inner tube 26, at least one sealing ring 41 is provided between the outer side of the piston 29 and the inner side of the lower part of the second-stage piston outer tube 28, and at least one sealing ring 41 is provided between the outer side of the upper part of the lower joint 9 and the inner side of the lower part of the second-stage piston outer tube 28.

[0036] The multifunctional horizontal well fracturing packer of the present invention has large-diameter accessories such as rubber cylinder, retaining ring, support ring and straightening ring made of soluble materials, and other accessories with larger outer diameters have their outer diameters reduced while ensuring the performance of the packer. The soluble material dissolves when drilling, thereby effectively reducing the outer diameter of the packer when drilling. The sandblaster is integrated into the upper part of the packer to shorten the distance between the sandblasting port 10 and the rubber cylinder. Before drilling, the sand on the rubber cylinder is cleaned as much as possible to prevent the sand from jamming the drill. After sandblasting, the packer can be vigorously lifted up from the bottom to disengage the release hand, and the upper part such as the rubber cylinder is lifted out. The salvage tool is lowered to grab the hydraulic cylinder part of the release hand, and the well is washed to wash out the annular sand, and all the fracturing pipes are salvaged step by step.

[0037] Specific use cases: The working process of the multifunctional horizontal well fracturing packer used in 5 1 / 2" casing (inner diameter 118.62mm) is described in detail.

[0038] The maximum outer diameter of the multifunctional horizontal well fracturing packer is soluble rubber tube 15, soluble retaining ring 14, soluble support ring 13 and soluble straightening ring 40, with a maximum outer diameter of φ110mm, and the maximum outer diameter of other parts is 95mm. The inner diameter of the packer is determined according to the number of fracturing layers, with a maximum of φ53mm, φ50mm, φ47mm, φ44mm, φ41mm, φ38mm, φ35mm, etc., with a total of 7 specifications, which can be divided into 8 layers for fracturing. The packer can withstand a pressure of 70MPa and a temperature of 150℃. The dissolution time of the soluble material is adjusted according to the formation temperature and liquid mineralization. It starts to dissolve after 3 days and is completely dissolved in 15 days.

[0039] The side surface of the sandblasting body 1 is symmetrically provided with two long-side elliptical sandblasting openings 10. The total area of ​​the sand outlet openings is 10323 mm².

[0040] The packer unsealing pressure difference is 8MPa to 10MPa, and the setting pin 32 is sheared. The ball throwing pressure can shear the sandblasting shear pin 12, and the sliding sleeve 3 falls into the sliding sleeve positioning tube 8, leaking the sandblasting port 10, and normal sandblasting fracturing can be performed. The ball throwing pressure difference of the sliding sleeve 3 is 8MPa to 10MPa.

[0041] The specific working process is as follows: Sealing: Connect the multifunctional horizontal well fracturing packer to the fracturing string and transport it to the designed well section. Send pressure liquid into the multifunctional horizontal well fracturing packer. The pressure liquid enters the gap between the top of the piston inner cylinder 26 and the bottom of the boss 23 through the upper radial liquid through hole 42, and enters the injection concave platform 33 through the lower radial liquid through hole 34. The piston 29 is pushed upward by the pressure liquid in the injection concave platform 33 and transmits the thrust to the positioning sleeve 27. When the thrust is large enough, the sealing pin 32 is pushed. Shearing, at this time, the positioning sleeve 27 moves upward in the lower travel concave platform 31 under the action of the piston 29 until the top of the positioning sleeve 27 abuts against the top of the lower travel concave platform 31 of the piston inner cylinder 26, and then the first-stage piston outer cylinder 25 continues to move upward under the dual action of the liquid injection of the upper radial liquid through hole 42 and the thrust of the positioning sleeve 27, thereby pushing the push cylinder 7 upward, and the push cylinder 7 pushes the serrated outer cylinder 20 upward, and the upward serrated outer cylinder 20 compresses the soluble gel cylinder 15, so as to realize the setting of the multifunctional horizontal well fracturing packer; Sandblasting fracturing: After the packer is set, a ball is thrown into the packer to pressurize it, cutting off the sandblasting shear pins 12, and the sliding sleeve 3 falls to the sliding sleeve limit platform 37 of the sliding sleeve positioning tube 8, leaking out the sandblasting port 10, and normal sandblasting fracturing; After the fracturing is completed, the soluble retaining ring 14, the soluble glue tube 15, the soluble support ring 13, the soluble straightening ring 40, the soluble stop tube 21 and the like are gradually dissolved, the tubing string is lifted, and the upper part of the packer is first pulled out of the wellbore.

[0042] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

[0043] The working process of the present invention is as follows: Figure 6 As shown, the multifunctional horizontal well fracturing packer (hereinafter referred to as the packer) is connected to the fracturing string, and the packer is stuck between each fracturing layer. All packers are set, and the bottom valve 46 sliding sleeve is opened by continuous pressure to perform fracturing of the first layer; the first-stage packer sliding sleeve 3 is knocked off by dropping the ball, and the sandblasting port 10 is opened to perform fracturing of the second layer; the ball is dropped in sequence to knock off the upper packer sliding sleeve 3, and the fracturing construction of each layer section is completed in sequence.

[0044] After the fracturing operation is completed, wait for the wellhead pressure to drop to zero after the later stop of the blowout, then backwash the well with a large displacement to wash out the annular sand and pull out the drill. The soluble materials in the large diameter parts such as the packer rubber tube are dissolved, which effectively reduces the overall outer diameter of the packer and reduces the risk of drill sticking. If the unblocking is ineffective, lift the string vigorously, break the lifting shear nails at the bottom of the packer, pull out the upper part of the packer from the wellbore first, and then lower the fishing tool for fishing. Wash the well with a large displacement to wash out the annular sand, and pull out all the fracturing strings in the well in turn.

Claims

1. A multifunctional horizontal well fracturing packer, characterized in that The utility model comprises a sandblasting body, a sealing seat, a sliding sleeve, an upper sealing positioning sleeve, a soluble rubber cylinder assembly, a lower sealing positioning sleeve, a stop assembly, an elastic grip, a push cylinder, a sliding sleeve positioning cylinder, a hydraulic cylinder assembly and a lower joint. The central circumference of the sandblasting body is provided with a left-right symmetrical sandblasting port. The upper end of the sliding sleeve is fixedly connected to the sandblasting body above the sandblasting port by a sandblasting shear nail. The sealing seat is sleeved on the inner side of the sandblasting body at the upper end of the sliding sleeve. A fracturing ball seat is provided on the inner side of the sliding sleeve at the sealing seat. The inner side of the lower part of the sandblasting body and the upper outer side of the upper sealing positioning sleeve are connected. The two sides are fixedly installed together, the sealing sleeve at the lower end of the sliding sleeve is mounted on the inner side of the sliding sleeve positioning cylinder, the lower end of the sliding sleeve positioning cylinder is fixedly mounted together with the upper part of the hydraulic cylinder assembly, the lower part of the hydraulic cylinder assembly is fixedly mounted together with the lower joint, and a push cylinder fixedly connected to the upper part of the hydraulic cylinder assembly is mounted on the outer side of the sliding sleeve positioning cylinder, and a soluble rubber cylinder assembly and a stop assembly are mounted from top to bottom on the outer side of the sliding sleeve between the upper sealing positioning sleeve and the push cylinder, and the lower sealing positioning sleeve and the elastic grip are fixedly mounted between the soluble rubber cylinder assembly on the inner side of the stop assembly and the sliding sleeve positioning cylinder.

2. The multifunctional horizontal well fracturing packer according to claim 1, characterized in that The soluble rubber tube assembly includes a soluble support ring, at least two soluble baffle rings, a soluble rubber tube, a rubber tube center tube and an adjustment ring. The rubber tube center tube is sleeved on the outside of the sliding sleeve. The upper end outer side and the lower end outer side of the rubber tube center tube are respectively fixedly installed with the lower inner side of the upper sealing positioning sleeve and the upper inner side of the lower sealing positioning sleeve. The soluble baffle ring, the soluble rubber tube, the soluble baffle ring and the adjustment ring are sequentially sleeved on the outer side of the rubber tube center tube between the upper sealing positioning sleeve and the lower sealing positioning sleeve. A limiting ring platform is arranged on the outer side of the upper sealing positioning sleeve below the sandblasting body, and a soluble support ring is fixedly installed in the limiting ring platform.

3. The multifunctional horizontal well fracturing packer according to claim 1 or 2, characterized in that The backstop assembly includes a serrated backstop ring, a backstop guide shoe, a serrated outer cylinder, a soluble backstop cylinder and a backstop cylinder. Saw teeth with tooth tips facing downward are arranged on the inner side of the serrated outer cylinder. The serrated backstop ring is provided with clamping teeth with tooth tips facing upward and cooperating with the serrated teeth. An outer ring surface which is wider at the top and narrower at the bottom is arranged on the outer side of the lower part of the serrated backstop ring. An inner ring platform corresponding to the outer ring surface is arranged on the inner side of the upper part of the backstop guide shoe. The serrated outer cylinder is sleeved on the outer side of the lower sealing positioning sleeve between the soluble rubber cylinder assembly and the push cylinder. A mounting recessed platform with an opening facing downward is arranged on the inner side of the lower part of the lower sealing positioning sleeve. The serrated backstop ring, the backstop guide shoe, the soluble backstop cylinder and the backstop cylinder are sleeved from top to bottom in the mounting recessed platform on the inner side of the serrated outer cylinder.

4. The multifunctional horizontal well fracturing packer according to claim 1 or 2, characterized in that The cylinder assembly includes a primary piston outer cylinder, a piston inner cylinder, a positioning sleeve, a secondary piston outer cylinder and a piston. The outer side of the lower part of the piston inner cylinder is fixedly installed together with the inner side of the upper part of the lower joint, the inner side of the upper end of the piston inner cylinder is fixedly installed together with the inner side of the lower end of the sliding sleeve positioning cylinder, and the lower part of the secondary piston outer cylinder is fixedly installed on the upper outer side of the lower joint through a fixing pin. A boss abutting against the outer side of the sliding sleeve positioning cylinder is arranged on the inner side of the upper part of the primary piston outer cylinder, the top of the piston inner cylinder is adjacent to the bottom end of the boss, a gap is arranged between the top of the piston inner cylinder and the bottom end of the boss, an upper radial liquid through hole is arranged on the sliding sleeve positioning cylinder corresponding to the inside and outside of the gap, and a long The lower traveling recess is larger than the total length of the positioning sleeve and the piston, the positioning sleeve and the piston are located in the lower traveling recess from top to bottom, the positioning sleeve is fixedly connected to the secondary piston outer cylinder by a sealing pin, the upper outer side of the positioning sleeve is fixedly connected to the lower inner side of the primary piston outer cylinder, an injection recess is arranged on the lower inner side of the piston, a lower radial liquid through hole is arranged on the piston inner cylinder corresponding to the inside and outside of the injection recess, a lower drainage hole communicating with the lower traveling recess is arranged on the primary piston outer cylinder above the positioning sleeve, an upper traveling recess that meets the upward movement of the primary piston outer cylinder is arranged on the outer side of the sliding sleeve positioning cylinder above the primary piston outer cylinder, and an upper drainage hole communicating with the upper traveling recess is arranged at the lower part of the push cylinder.

5. The multifunctional horizontal well fracturing packer according to claim 3, characterized in that The cylinder assembly includes a primary piston outer cylinder, a piston inner cylinder, a positioning sleeve, a secondary piston outer cylinder and a piston. The outer side of the lower part of the piston inner cylinder is fixedly installed together with the inner side of the upper part of the lower joint, the inner side of the upper end of the piston inner cylinder is fixedly installed together with the inner side of the lower end of the sliding sleeve positioning cylinder, and the lower part of the secondary piston outer cylinder is fixedly installed on the upper outer side of the lower joint through a fixing pin. A boss abutting against the outer side of the sliding sleeve positioning cylinder is arranged on the inner side of the upper part of the primary piston outer cylinder, the top of the piston inner cylinder is adjacent to the bottom end of the boss, a gap is arranged between the top of the piston inner cylinder and the bottom end of the boss, an upper radial liquid through hole is arranged on the sliding sleeve positioning cylinder corresponding to the inside and outside of the gap, and a long The lower traveling recess is larger than the total length of the positioning sleeve and the piston, the positioning sleeve and the piston are located in the lower traveling recess from top to bottom, the positioning sleeve is fixedly connected to the secondary piston outer cylinder by a sealing pin, the upper outer side of the positioning sleeve is fixedly connected to the lower inner side of the primary piston outer cylinder, an injection recess is arranged on the lower inner side of the piston, a lower radial liquid through hole is arranged on the piston inner cylinder corresponding to the inside and outside of the injection recess, a lower drainage hole communicating with the lower traveling recess is arranged on the primary piston outer cylinder above the positioning sleeve, an upper traveling recess that meets the upward movement of the primary piston outer cylinder is arranged on the outer side of the sliding sleeve positioning cylinder above the primary piston outer cylinder, and an upper drainage hole communicating with the upper traveling recess is arranged at the lower part of the push cylinder.

6. The multifunctional horizontal well fracturing packer according to claim 4, characterized in that A soluble straightening ring is fixedly installed on the outer side of the lower joint below the secondary piston outer cylinder; threads are arranged on the sandblasting body and the lower joint.

7. The multifunctional horizontal well fracturing packer according to claim 5, characterized in that A soluble straightening ring is fixedly installed on the outer side of the lower joint below the secondary piston outer cylinder; threads are arranged on the sandblasting body and the lower joint.

8. The multifunctional horizontal well fracturing packer according to claim 4, characterized in that A sleeve limit platform is provided at the lower part of the sleeve positioning cylinder; a sleeve piston is fixedly installed at the bottom of the sleeve, an elastic grab is installed between the lower sealing positioning sleeve and the sleeve piston, and the elastic grab is fixedly connected to the upper end of the sleeve positioning cylinder by lifting and pulling shear pins, the shear strength of the locking pins is greater than the shear strength of the lifting and pulling shear pins, the shear strength of the lifting and pulling shear pins is greater than the shear strength of the sandblasting shear pins, and the shear strength of the sandblasting shear pins is greater than the shear strength of the sealing pins.

9. The multifunctional horizontal well fracturing packer according to claim 5, 6 or 7, characterized in that A sleeve limit platform is provided at the lower part of the sleeve positioning cylinder; a sleeve piston is fixedly installed at the bottom of the sleeve, an elastic grab is installed between the lower sealing positioning sleeve and the sleeve piston, and the elastic grab is fixedly connected to the upper end of the sleeve positioning cylinder by lifting and pulling shear pins, the shear strength of the locking pins is greater than the shear strength of the lifting and pulling shear pins, the shear strength of the lifting and pulling shear pins is greater than the shear strength of the sandblasting shear pins, and the shear strength of the sandblasting shear pins is greater than the shear strength of the sealing pins.

10. The multifunctional horizontal well fracturing packer according to claim 9, characterized in that At least one sealing ring is arranged between the outer side of the upper end of the sliding sleeve and the inner side of the upper part of the sandblasting body, at least one sealing ring is arranged between the inner side of the upper sealing positioning sleeve and the outer side of the sliding sleeve, at least one sealing ring is arranged between the inner side of the upper sealing positioning sleeve and the outer side of the upper part of the center tube of the rubber tube, at least one sealing ring is arranged between the outer side of the bottom of the sliding sleeve and the inner side of the sliding sleeve piston, at least one sealing ring is arranged between the outer side of the sliding sleeve piston and the inner side of the upper part of the sliding sleeve positioning cylinder, at least one sealing ring is arranged between the outer side of the lower part of the sliding sleeve positioning cylinder and the inner side of the upper part of the first-level piston outer cylinder, at least one sealing ring is arranged between the outer side of the upper part of the piston inner cylinder and the inner side of the upper part of the first-level piston outer cylinder, at least one sealing ring is arranged between the inner side of the piston and the outer side of the lower part of the piston inner cylinder, at least one sealing ring is arranged between the outer side of the piston and the inner side of the lower part of the secondary piston outer cylinder, and at least one sealing ring is arranged between the outer side of the upper part of the lower joint and the inner side of the lower part of the secondary piston outer cylinder.

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