Injection-production pipe column with seal

Abstract

The utility model relates to an injection-production tubular column with a seal, which is used for oil exploitation, belongs to the technical field of underground gas injection tools for oil exploitation, and is characterized in that a rubber sleeve of a packer is designed to be made of an anti-corrosion material, so that the rubber sleeve has good corrosion resistance, a sleeve above the packer can be effectively prevented from being corroded, and the technical problem of serious corrosion is effectively solved; the slip mechanism adopts a split slip design, so that the lifting unblocking force is reduced, the unblocking of the packer is facilitated, and the success rate of setting and unblocking is improved; the slip mechanism is of a split type anchoring structure of the upper slip part and the lower slip part, the purpose of preventing displacement of the packer in the casing is achieved, and the slip mechanism has good stability, is obvious in field use effect and has good popularization prospects.

Description

Technical Field

[0001] The utility model relates to the technical field of gas injection tools for oil production wells, in particular to a sealed injection and production pipe string. Background Art

[0002] Nitrogen injection for oil recovery has become an important way to increase production in Tahe Oilfield. In order to reduce costs and increase efficiency, Tahe Oilfield mostly uses machine-pumped pipes for gas injection. Gas injection oxygen absorption corrosion easily causes corrosion of the gas injection pipe, making it difficult to unseal the packer, and unable to effectively protect the casing, affecting production timeliness and mining costs. Therefore, it is urgent to develop a sealed injection and production pipe to meet production needs. Utility Model Content

[0003] In order to solve the technical problems in the prior art that oxygen absorption corrosion during gas injection easily causes corrosion of the gas injection pipe string, the packer is difficult to unseal, and the casing cannot be effectively protected, the utility model provides a sealed injection and production pipe string, which can effectively solve the problems of severe corrosion of the packer and difficulty in unsealing.

[0004] The utility model provides a pipe string with sealing, comprising: a well casing, an oil pipe located at the center of the well casing, a sucker rod installed inside the oil pipe, an oil pump installed at the lower part of the sucker rod and inside the oil pipe, a circulation valve located below the oil pump, a packer located below the circulation valve, and a screen pipe and a wire plug located below the packer in sequence;

[0005] The packer includes: an upper joint, a center pipe, an anchoring device, a sand control ring, a metal upper cylinder, a metal lower cylinder, parts inside the casing and a lower joint; the upper joint and the center pipe, and the center pipe and the lower joint are respectively connected by threads; the anchoring device is located at the top of the center pipe and is connected to the center pipe by threads; the sand control ring is located below the anchoring device and is sleeved on the center pipe.

[0006] In a specific implementation, the oil pipe is welded to an external oil pipe bracket; the oil pump is connected to the oil pipe using a fixture provided by the oil pump; the sucker rod is located at the center of the oil pipe, and the sucker rod is connected to the oil pump using a connector provided by the sucker rod; the screen pipe and the threaded plug are connected as a whole in sequence through threads.

[0007] In a specific implementation, the parts in the casing include: an upper slip shear pin, an upper slip part, an upper cone, an upper rubber tube, a lower rubber tube, a lower cone, a locking ring, a lower slip part, a lower slip shear pin, a piston, a piston shear pin, and an unsealing pin; the metal upper cylinder is located below the sand control ring and is sleeved on the center pipe; the parts in the middle of the metal upper cylinder and the center pipe include an upper slip shear pin, an upper slip part, and an upper cone from top to bottom, wherein the upper slip part is fixed to the metal upper cylinder by the upper slip shear pin; the lower end of the upper cone and the upper end of the upper rubber tube are connected by a wire The lower end of the lower rubber cylinder is connected to the upper end of the lower cone by a threaded connection, and the middle parts of the metal lower cylinder and the central tube are the lower cone, the locking ring, the lower slip part, the lower slip shear pin, the piston, the piston shear pin, and the unsealing pin from top to bottom, wherein the locking ring annularly sleeves the lower cone and the lower slip part into one body, and they can move in the same direction; the lower slip part is fixed to the metal lower cylinder by the lower slip shear pin, and the piston is fixed to the metal lower cylinder by the piston shear pin, and the unsealing pin is located at the lower end of the metal lower cylinder.

[0008] In a specific implementation, the slip portions corresponding to the metal upper cylinder and the metal lower cylinder have notches, so that the slips extend out of the metal cylinder through the notches when squeezed, and the slips are anchored to the inner wall of the well casing.

[0009] In a specific implementation, the piston, the upper slip portion, the lower slip portion, the metal upper cylinder and the metal lower cylinder all have n small holes on their surfaces.

[0010] In a specific implementation, the shear pin can fix the piston, the slip and the metal cylinder through the small hole. In a specific implementation, the upper slip part and the lower slip part each have n split slips inside, and the split slips are double-sided threaded.

[0011] In a specific implementation, the split slip is double-sided threaded.

[0012] In a specific implementation, the split slip material is an anti-corrosion material.

[0013] Beneficial effects:

[0014] The utility model provides a sealed injection and production pipe column. The packer rubber cylinder is made of anti-corrosion material and has good corrosion resistance. It can effectively prevent the casing above the packer from being corroded, and effectively solves the technical problem of serious corrosion. The slip mechanism adopts a split slip design to reduce the lifting and unsealing force, which is beneficial to the unsealing of the packer and improves the success rate of setting and unsealing. The slip mechanism adopts a split anchoring structure of an upper slip part and a lower slip part to achieve the purpose of preventing the displacement of the packer in the casing, has good stability, and has obvious on-site use effect, and has a good promotion prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] Figure 1 A schematic diagram of the structure of a sealed injection and production pipe string provided by the utility model;

[0017] Figure 2 A structural diagram of the anti-corrosion packer provided by the utility model;

[0018] Figure 3 The upper slip and lower slip structure diagram provided by the utility model;

[0019] In the figure: 100- sucker rod; 200- oil pipe; 300- oil pump; 400- circulating valve; 500- packer; 600- screen pipe; 700- plug; 800- well casing; 1- sand control ring; 2- upper cone; 3- upper rubber cylinder; 4- lower rubber cylinder; 5- lower cone; 6- upper slip part; 7- lower slip part; 8- locking ring; 9- piston; 10- piston shear pin; 11- upper slip shear pin; 12- lower slip shear pin; 13- unsealing pin; 14- upper joint; 15- center pipe; 16- lower joint; 17- anchoring device; 18- metal upper cylinder; 19- metal lower cylinder; 20- upper petal slip; 21- lower petal slip. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] In order to solve the technical problems in the prior art that oxygen absorption corrosion during gas injection easily causes corrosion of the gas injection string, the packer is difficult to unseal, and the casing cannot be effectively protected, the utility model provides a sealed injection and production string, which can effectively solve the problems of severe corrosion of the packer and difficulty in unsealing.

[0022] Figure 1This is a schematic diagram of a sealed injection and production pipe string structure provided by the utility model. Figure 1 As shown, the utility model provides a sealed injection and production string, comprising: a well casing 800, an oil pipe 200 located at the center of the well casing 800, a sucker rod 100 installed inside the oil pipe 200, an oil pump 300 installed at the lower part of the sucker rod 100 and inside the oil pipe 200, a circulation valve 400 located below the oil pump 300, a packer 500 located below the circulation valve 400, and a screen pipe 600 and a wire plug 700 located below the packer 500 in sequence;

[0023] Figure 2 The structure diagram of the anti-corrosion packer provided by the utility model is as follows: Figure 2 As shown, the packer 500 includes: an upper joint 14, a center pipe 15, an anchoring device 17, a sand control ring 1, a metal upper cylinder 18, a metal lower cylinder 19, parts inside the casing and a lower joint 16; the upper joint 14 and the center pipe 15, and the center pipe 15 and the lower joint 16 are respectively connected by threads; the anchoring device 17 is located at the top of the center pipe 15 and is connected to the center pipe 15 by threads; the sand control ring 1 is located below the anchoring device 17 and is ring-shaped on the center pipe 15.

[0024] In this solution, the oil pipe 200 is welded to the external oil pipe bracket; the oil pump 300 is connected to the oil pipe 200 using the oil pump's own fixture; the sucker rod 100 is located at the center of the oil pipe 200, and the sucker rod 100 is connected to the oil pump 300 using the sucker rod 100's own connector; the screen pipe 600 and the threaded plug 700 are sequentially connected as a whole through threads.

[0025] In this scheme, the parts in the casing include: an upper slip shear pin 11, an upper slip part 6, an upper cone 2, an upper rubber tube 3, a lower rubber tube 4, a lower cone 5, a locking ring 8, a lower slip part 7, a lower slip shear pin 12, a piston 9, a piston shear pin 10, and an unsealing pin 13; the metal upper cylinder 18 is located below the sand control ring 1 and is sleeved on the center pipe 15; the middle part of the metal upper cylinder 18 and the center pipe 15 includes the upper slip shear pin 11, the upper slip part 6, and the upper cone 2 from top to bottom, wherein the upper slip part 6 is fixed to the metal upper cylinder 18 by the upper slip shear pin 11; the lower end of the upper cone 2 is connected to the upper end of the upper rubber tube 3 by a threaded connection The lower end of the lower rubber cylinder 4 is connected to the upper end of the lower cone 5 by a threaded connection, and the middle parts of the metal lower cylinder 19 and the central tube 15 are the lower cone 5, the locking ring 8, the lower slip part 7, the lower slip shear pin 12, the piston 9, the piston shear pin 10, and the unsealing pin 13 from top to bottom, wherein the locking ring 8 annularly sleeves the lower cone 5 and the lower slip part 7 into one body, and can move in the same direction; the lower slip part 7 is fixed to the metal lower cylinder 19 by the lower slip shear pin 12, the piston 9 is fixed to the metal lower cylinder 19 by the piston shear pin 10, and the unsealing pin 13 is located at the lower end of the metal lower cylinder 19.

[0026] In this solution, the slip parts corresponding to the metal upper cylinder 18 and the metal lower cylinder 19 have notches, so that the slips can extend out of the metal cylinder through the notches when squeezed, and the slips are anchored to the inner wall of the well casing 800.

[0027] In this solution, the piston 9, the upper slip portion 6, the lower slip portion 7, the metal upper cylinder 18 and the metal lower cylinder 19 all have n small holes on their surfaces.

[0028] In this solution, the shear pins can fix the piston, slips and metal cylinder through the small holes.

[0029] In this solution, n petal slips are provided inside the upper slip part 6 and the lower slip part 7, and the petal slips are double-sided threaded.

[0030] Figure 3 The upper slip and lower slip structure diagram provided by the utility model are as follows: Figure 3 As shown, the split slip is double-sided threaded.

[0031] In this solution, the split slip material is an anti-corrosion material.

[0032] In this scheme, the role of the sand control ring is to prevent large particles from falling into the wellbore; the role of the rubber sleeve is to compress the rubber sleeve to fix the packer; the role of the slip is to control the rubber sleeve assembly to fix the packer; the role of the piston is to use the piston force generated by the piston mechanism to push the sand control ring, rubber sleeve and slip to move; the role of the pin is that the shear pin blocks the piston and slip in an uninstalled state before setting, and under the action of the piston force, the shear pin of the piston and slip is sheared off when setting, and the piston and slip are in an action state, and the shear pin is in an installed state after setting; the role of the packer is to set the packer in the annulus outside the oil pipe and inside the casing to separate the annulus into an upper area and a lower area to prevent pollutants in the lower area from affecting the upper area; the role of the circulation valve is to release the annulus pressure to the oil pipe when the annulus pressure exceeds the predetermined value n Pascal.

[0033] In this scheme, when nitrogen is injected into the pump well to drive oil, first lift the sucker rod to the top of the Christmas tree, remove the polished rod and a certain length of sucker rod, confirm that the sucker rod and the oil pump are lifted out of the tubing, and then inject gas into the pump well. After the gas injection is completed, the gas will flow back, and the pressure will be increased by injecting fluid into the annulus. When the pressure reaches 30MPa, the circulation valve opens, and the liquid in the annulus flows into the tubing through the circulation valve. When the pressure of the annulus and the tubing is balanced, the mandrel moves upward under the action of the spring, and the circulation hole is closed to achieve the purpose of well pressure.

[0034] Tubing pressurization and sealing method: Use liquid to pressurize the tubing 200, the piston force pushes the piston shear pin 10 upward to cut off, the lower end of the piston is sealed, the piston force pushes the sand control ring 1, the rubber cylinder assembly, the slips and other components upward, the lower slip shear pin 12, the upper slip shear pin 11, and the sand control ring shear pin are cut off in sequence, the sand control ring 1 is compressed and close to the inner wall of the casing, the upper cone 2 moves upward, and the upper slip part 6 is anchored on the inner wall of the casing; the upper rubber cylinder 3 is fixed as the upper slip part 6 is anchored, the lower rubber cylinder 4 continues to be compressed, the rubber cylinder is completely compressed and sealed on the inner wall of the casing, the piston 9 continues to move upward, the lower cone 5 pushes the lower slip part 7 upward, and the lower slip part 7 is anchored on the inner wall of the casing. The higher the liquid pressure, the greater the piston thrust, the lower slip part 7 continues to move upward, the stability of the rubber cylinder is improved, and the sealing effect is better.

[0035] Method for unsealing the lifting pipe column: the unsealing pin 13 of the lifting tubing 200 is cut off, the mandrel moves upward, the four petal slips of the upper slip part 6 are unanchored in turn, the locking ring 8 drives the lower cone 5 upward, the four petal slips of the lower slip part 7 are unanchored in turn, the upper rubber cylinder 3 and the lower rubber cylinder 4 are reset, and the packer is unsealed.

[0036] The utility model provides a sealed injection and production pipe string. The rubber tube is made of anti-corrosion material and has good corrosion resistance. The slip mechanism adopts a split slip design to improve the success rate of sealing and unsealing. The slip mechanism adopts a split anchoring structure to effectively prevent the displacement of the packer in the casing.

[0037] It should be noted that the above-mentioned specific implementation methods can enable those skilled in the art to more fully understand the invention of the utility model, but do not limit the invention of the utility model in any way. Therefore, although this specification has described the invention of the utility model in detail with reference to the drawings and embodiments, those skilled in the art should understand that the invention of the utility model can still be modified or replaced by equivalents. In short, all technical solutions and improvements that do not deviate from the spirit and scope of the invention of the utility model and their improvements should be included in the protection scope of the patent of the invention of the utility model.

Claims

1. A sealed injection and production string, characterized in that: include: A well casing (800), an oil pipe (200) located at the center of the well casing (800), a sucker rod (100) installed inside the oil pipe (200), an oil pump (300) installed below the sucker rod (100) and inside the oil pipe (200), a circulation valve (400) located below the oil pump (300), a packer (500) located below the circulation valve (400), and a screen pipe (600) and a wire plug (700) located below the packer (500) in sequence; The packer (500) comprises: an upper joint (14), a central tube (15), an anchoring device (17), a sand control ring (1), a metal upper cylinder (18), a metal lower cylinder (19), parts inside the casing and a lower joint (16); the upper joint (14) and the central tube (15), and the central tube (15) and the lower joint (16) are respectively connected by threads; the anchoring device (17) is located at the top of the central tube (15) and is connected to the central tube (15) by threads; the sand control ring (1) is located below the anchoring device (17) and is sleeved on the central tube (15).

2. The sealed injection and production string according to claim 1, characterized in that: The oil pipe (200) is welded to an external oil pipe bracket; the oil pump (300) is connected to the oil pipe (200) by using a fixture provided by the oil pump; the sucker rod (100) is located at the center of the oil pipe (200), and the sucker rod (100) is connected to the oil pump (300) by using a connector provided by the sucker rod (100); the screen pipe (600) and the threaded plug (700) are connected as a whole in sequence by threads.

3. The sealed injection and production string according to claim 1, characterized in that: The parts inside the casing include: an upper slip shear pin (11), an upper slip part (6), an upper cone (2), an upper rubber tube (3), a lower rubber tube (4), a lower cone (5), a locking ring (8), a lower slip part (7), a lower slip shear pin (12), a piston (9), a piston shear pin (10), and an unsealing pin (13); the metal upper cylinder (18) is located below the sand control ring (1) and is sleeved on the center pipe (15); the parts in the middle of the metal upper cylinder (18) and the center pipe (15) include, from top to bottom, an upper slip shear pin (11), an upper slip part (6), and an upper cone (2), wherein the upper slip part (6) is fixed to the metal upper cylinder (18) by the upper slip shear pin (11); the lower end of the upper cone (2) and the upper end of the upper rubber tube (3) are connected by threads. The lower end of the lower rubber cylinder (4) is connected to the upper end of the lower cone (5) by a threaded connection. The intermediate parts of the metal lower cylinder (19) and the central tube (15) are, from top to bottom, the lower cone (5), the locking ring (8), the lower slip part (7), the lower slip shear pin (12), the piston (9), the piston shear pin (10), and the unsealing pin (13). The locking ring (8) surrounds the lower cone (5) and the lower slip part (7) as a whole and can move in the same direction. The lower slip part (7) is fixed to the metal lower cylinder (19) by the lower slip shear pin (12), the piston (9) is fixed to the metal lower cylinder (19) by the piston shear pin (10), and the unsealing pin (13) is located at the lower end of the metal lower cylinder (19).

4. The sealed injection and production string according to claim 1, characterized in that: The slip parts corresponding to the metal upper cylinder (18) and the metal lower cylinder (19) are provided with notches, so that the slips extend out of the metal cylinder through the notches when squeezed, and the slips are anchored to the inner wall of the well casing (800).

5. The sealed injection and production string according to claim 3, characterized in that: The piston (9), the upper slip part (6), the lower slip part (7), the metal upper cylinder (18) and the metal lower cylinder (19) all have n small holes on their surfaces.

6. The sealed injection and production string according to claim 5, characterized in that: The shear pin can fix the piston, the slip and the metal cylinder through the small hole.

7. The sealed injection and production string according to claim 3, characterized in that: The upper slip part (6) and the lower slip part (7) are each provided with n split slips, and the split slips are double-sided threaded.

8. The sealed injection and production string according to claim 7, characterized in that: The split slip is in a double-sided threaded shape.

9. The sealed injection and production string according to claim 7, characterized in that: The split slip material is an anti-corrosion material.

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