Well completion pipe string sealing device

Abstract

The utility model discloses a well completion pipe string sealing device which comprises a pipe body, the periphery of the pipe body is used for abutting against the side wall of a pipe string for sealing, a pipe cavity of the pipe body is used for conveying oil gas, the pipe body is further provided with a penetrating channel, the penetrating channel and the pipe cavity of the pipe body are arranged in a spaced mode, and the penetrating channel is used for being matched with a cable and allowing the cable to penetrate through. By additionally arranging the penetrating channel on the pipe body, the cable can penetrate through the pipe body on the premise that sealing is guaranteed, so that a packer does not need to be put into a production pipe column in drilling liner perforation operation, and the penetrating channel is simple in structure, convenient to operate and low in cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and gas field exploitation equipment technical field, concretely relates to a well completion string sealing device. BACKGROUND

[0002] Tail pipe perforation completion is a very practical completion method, can carry out separate layer stimulation and cementing operation, is applicable to dilute oil and heavy oil oil layer use, application is very wide, has the advantages of better protection reservoir and cost reduction, needs to use electric submersible pump and other operation equipment in conventional tail pipe perforation completion operation.

[0003] CN102418492A a kind of horizontal well fracturing with back-connection insertion sealing device, mainly used in the horizontal well fracturing modification in the development of oil and gas field.Horizontal well fracturing with back-connection insertion sealing device is by upper connector, connecting cylinder, upper back cap, centralizer block, spring group, lower back cap, heart tube, sliding piston, sealing rubber cylinder, pressure ring, upper connecting sleeve, support sleeve, lower connecting sleeve and guide cone is formed, uses spring adjustment type centralizer mechanism, ensure that back-connection insertion sealing device is implemented smoothly back-connection in inclined well section, uses sliding piston compression sealing rubber cylinder.

[0004] Because it needs to be powered by cable to electric submersible pump and other operation equipment, the above prior art usually needs to be matched with special cable through packer when electric submersible pump and other operation equipment are used, to seal the annulus between tubing and casing, resulting in the whole device is more complex, inconvenient to use. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the above technical deficiencies, and provides a well completion string sealing device, which solves the technical problems of the prior art that the whole device is more complex and inconvenient to use.

[0006] To achieve the above technical purpose, the utility model adopts the following technical scheme:

[0007] The utility model provides a well completion string sealing device, which comprises:

[0008] A pipe body is arranged outside the pipe body, and the pipe body is arranged outside the pipe body.

[0009] In some embodiments, the through channel is provided with cable sealing joints at both ends; and / or

[0010] The through channel is provided with a plurality of through channels.

[0011] In some embodiments, the well completion string sealing device further comprises a joint assembly, a connecting channel is arranged in the middle of the joint assembly, one end of the joint assembly is connected with one end of the pipe body, and the connecting channel is in communication with the pipe cavity.

[0012] In some embodiments, the joint assembly is further provided with a through hole arranged in a spaced manner with the connecting channel, and the through hole is used for adapting to and passing through the cable.

[0013] In some embodiments, the joint assembly comprises a joint body and a bearing ring, one end of the joint body is connected with one end of the pipe body, the connecting channel is arranged in the joint body, and the bearing ring is sleeved on the outer periphery of the joint body, and the through hole is arranged in the bearing ring.

[0014] In some embodiments, the joint body and the pipe body are detachably connected.

[0015] In some embodiments, the bearing ring is rotatably installed on the joint body, so that the through hole can be rotated to correspond to the through channel.

[0016] In some embodiments, the outer periphery of the joint body is provided with external splines, one end of the bearing ring is provided with a spline groove, and the bearing ring is arranged in an axially movable manner along the joint body, so that when the bearing ring is rotated to a set position, the bearing ring is splined with the joint body to limit the rotation of the bearing ring.

[0017] In some embodiments, the outer periphery of the pipe body is provided with a sealing assembly, and the sealing assembly is used for abutting and sealing with the sidewall of the pipe string.

[0018] In some embodiments, the sealing assembly is provided with a plurality of sealing assemblies, and the plurality of sealing assemblies are arranged in a spaced manner in the vertical direction.

[0019] Compared with the prior art, the well completion string sealing device provided by the utility model can abut with the sidewall of the pipe string in the well to achieve a sealing effect, the through channel is used for passing through the cable to ensure the normal operation of the downhole operation equipment, the additional through channel arranged on the pipe body can pass the cable through the pipe body under the premise of ensuring the sealing, so that it is not necessary to lower the packer in the production pipe string in the tail pipe perforation operation, and the structure is simple, the operation is convenient, and the cost is low.

[0020] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, and the preferred embodiments of the utility model are described in detail below with the help of the drawings. The specific implementation of the utility model is given in detail by the following embodiments and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 This is a schematic diagram of an embodiment of the well completion tubing sealing device provided by this utility model;

[0022] Figure 2 yes Figure 1 A partial sectional view of the joint assembly;

[0023] Figure 3 yes Figure 1 A partial sectional view of the central tube body;

[0024] Figure 4 yes Figure 1 Partial sectional view of the middle bearing ring;

[0025] Figure 5 yes Figure 1 Top view of the load-bearing ring.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Connector assembly, 11-Connector body, 111-Connection channel, 112-External spline, 12-Bearing ring, 121-Through hole, 122-Spline groove, 13-Oil pipe coupling, 14-Oil pipe short section, 15-Limiting snap ring, 2-Pipe body, 21-Through channel, 22-Sealing assembly, 23-Limiting ring, 3-Cable sealing connector. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] To address the technical problems of existing devices being complex and inconvenient to use, this utility model provides a well completion tubing sealing device. By additionally setting a through-channel on the tubing, a cable can pass through the tubing while ensuring a seal, thus eliminating the need to insert a packer into the production tubing during tailpipe perforation operations. The device is simple in structure, convenient to operate, and low in cost.

[0030] Please see Figure 1 , Figure 1 This is a schematic diagram of the well completion tubing sealing device in one embodiment of the present invention.

[0031] This utility model provides a well completion tubing sealing device, including a tubing body 2. The outer periphery of the tubing body 2 is used to abut and seal against the side wall of the tubing string. The cavity of the tubing body 2 is used for oil and gas transportation. The tubing body 2 is also provided with a through passage 21 spaced apart from its cavity. The through passage 21 is used to adapt to and allow cables to pass through.

[0032] In this embodiment, the outer periphery of the pipe body 2 can abut against the side wall of the well tubing to achieve a sealing effect, while the through channel 21 is used for cable installation to ensure the normal operation of downhole equipment. By additionally setting the through channel 21 on the pipe body 2, the cable can pass through the pipe body 2 while ensuring sealing, thus eliminating the need to insert a packer into the production tubing during tailpipe perforation operations. The structure is simple, the operation is convenient, and the cost is low.

[0033] In this embodiment, please refer to Figure 3 The cable sealing joints 3 are provided at both ends of the passage 21.

[0034] Specifically, the diameter of the through channel 21 is adapted to the diameter of the cable or hydraulic pipeline, thereby playing a certain sealing role. In order to further improve the sealing performance of the through channel 21, cable sealing joints 3 can be set at both ends of the through channel 21. The cable sealing joints 3 can seal the gap between the through channel 21 and the cable, thereby improving the sealing performance and preventing oil and gas leakage.

[0035] In this embodiment, the crossing passage 21 is provided in multiple ways.

[0036] Specifically, since different downhole equipment requires different numbers of cables or hydraulic lines, the specific number of the crossing channels 21 is not limited and can be set according to the actual situation.

[0037] Furthermore, there are two or three passageways 21.

[0038] In this embodiment, since the pipe body needs to be lowered into the well for sealing, the well completion string sealing device also includes a connector assembly 1. The connector assembly 1 has a connecting channel 111 in its middle. One end of the connector assembly 1 is connected to one end of the pipe body 2, and the connecting channel 111 communicates with the corresponding cavity of the pipe. The other end of the connector assembly 1 is used to connect to external equipment. The pipe body 2 and the external equipment are connected through the connector assembly 1, and then the external equipment is used to send the pipe body 2 into the designated position.

[0039] In this embodiment, please refer to Figure 2 The connector assembly 1 is also provided with a through hole 121 spaced apart from the connection channel 111. The through hole 121 is used to adapt to the cable and allow the cable to pass through.

[0040] Specifically, since the pipe body 2 is a certain distance from the wellhead, in order to prevent the cable from twisting and shifting in the area between the pipe body 2 and the wellhead, the connector assembly 1 is provided with a through hole 121. The diameter of the through hole 121 is also adapted to the cable. By setting the through hole 121, the cable can be guided and limited, ensuring that the cable or hydraulic pipeline is connected to the wellhead in an orderly manner.

[0041] Furthermore, in embodiments where the passageway 21 has multiple configurations, the passage holes 121 are also provided in multiple configurations, and the number of passage holes 121 is consistent with the number of passageways 21.

[0042] In this embodiment, please refer to Figure 2 , Figure 4 and Figure 5 The connector assembly 1 includes a connector body 11 and a bearing ring 12. One end of the connector body 11 is connected to one end of the pipe body 2. The connection channel 111 is provided on the connector body 11. The bearing ring 12 is sleeved on the outer periphery of the connector body 11. The through hole 121 is provided on the bearing ring 12.

[0043] Specifically, the connector body 11 is generally tubular in shape. The upper end of the connector body 11 is used for external connection, and the lower end of the connector body 11 is connected to the upper end of the tube body 2. The cavity of the connector body 11 forms the connection channel 111. The bearing ring 12 is sleeved on the outer periphery of the connector body 11 and is located in the middle of the connector body 11. The through hole 121 is provided on the bearing ring 12, and the distance from the through hole 121 to the axis of the connector body 11 is the same as the distance from the through channel 21 to the axis of the tube body 2. The connector body 11 is used to connect with the tube body 2, and the bearing ring 12 is used to open the through hole 121, so as to achieve connection with the tube body 2 while allowing the cable to pass through.

[0044] Furthermore, a boss is formed in the middle of the outer periphery of the bearing ring 12. The boss is arranged around the outer periphery of the bearing ring 12 and is eccentrically arranged with the bearing ring 12. The diameter of the boss is slightly larger than the maximum diameter of the tube body 2. The through hole 121 is provided in the boss. In actual use, the boss can abut against the top of the tube column and play a limiting role.

[0045] In this embodiment, the connector body 11 and the tube body 2 are detachably connected.

[0046] Specifically, for ease of transportation and subsequent maintenance, the connector body 11 and the pipe body 2 are separate units that can be joined together.

[0047] Further, please refer to Figure 3The joint assembly 1 further includes a tubing coupling 13 and a tubing stub 14. The upper end of the tubing stub 14 is adapted to the lower end of the joint body 11, and the upper end of the tubing stub 14 abuts against the lower end of the joint body 11. The tubing coupling 13 is sleeved on the outer periphery of the tubing stub 14 and the joint body 11, thereby connecting the tubing stub 14 and the joint body 11. The tubing stub 14 is inserted into the pipe body 2. The joint assembly 1 and the pipe body 2 are connected by the tubing coupling 13 and the tubing stub 14. The length of the tubing stub 14 can be adjusted according to the actual situation, thereby adjusting the distance between the joint assembly 1 and the pipe body 2 to adapt to different oil and gas wells.

[0048] In this embodiment, the bearing ring 12 is rotatably mounted on the connector body 11 so that the through hole 121 can be rotated to correspond to the through channel 21.

[0049] Specifically, since the connector body 11 is detachably connected to the pipe body 2 via the oil pipe coupling 13 and the oil pipe short section 14, it is impossible to guarantee that the through hole 121 corresponds one-to-one with the through channel 21 during installation. Therefore, after the connector body 11 and the pipe body 2 are installed, the bearing ring 12 needs to be adjusted so that the through hole 121 corresponds to the through channel 21. Thus, the bearing ring 12 is rotated and installed on the outer periphery of the connector body 11 along the vertical axis, so that the position of the through hole 121 is adjustable to ensure that the through hole 121 corresponds one-to-one with the through channel 21.

[0050] In this embodiment, please refer to Figure 2 , Figure 4 and Figure 5 The connector body 11 has an external spline 112 on its outer periphery, and the bearing ring 12 has a spline groove 122 at one end. The bearing ring 12 is movably arranged along the axial direction of the connector body 11 so that when the bearing ring 12 rotates to a set position, the bearing ring 12 engages with the spline of the connector body 11 to restrict the rotation of the bearing ring 12.

[0051] Specifically, to prevent the bearing ring 12 from rotating accidentally after the through hole 121 is aligned with the through channel 21, an external spline 112 is provided at the outer periphery of the upper end of the connector body 11. The bearing ring 12 is slidably and rotatably mounted on the outer periphery of the lower part of the connector body 11, and a spline groove 122 is provided at the upper end of the bearing ring 12. When the bearing ring 12 moves upward, the spline groove 122 and the external spline 112 engage, thereby restricting the rotation of the bearing ring 12. When the bearing ring 12 moves downward, the spline groove 112 engages with the external spline 112. When the spline groove 122 and the external spline 112 are disengaged, the bearing ring 12 can rotate freely, thereby adjusting the position of the through hole 121. In specific use, in the initial state, the spline groove 122 and the external spline 112 are disengaged. By rotating the bearing ring 12, the through hole 121 and the through channel 21 are kept on the same axis. After the through hole 121 and the through channel 21 are aligned, the bearing ring 12 is slid upward to make the spline groove 122 and the external spline 112 mesh, thus preventing the bearing ring 12 from rotating accidentally.

[0052] Furthermore, after the through hole 121 is aligned with the through channel 21, to prevent the bearing ring 12 from sliding downwards, the outer periphery of the connector body 11 is also provided with a ring-shaped retaining groove. The connector assembly 1 also includes a limiting retaining spring 15. When the bearing ring 12 is splined with the connector body 11, the limiting retaining spring 15 is disposed in the retaining groove to restrict the bearing ring 12 from moving axially. This arrangement can fix the bearing ring 12, preventing the spline groove 122 from disengaging from the external spline 112 during use. When it is necessary to rotate the bearing ring 12, the limiting retaining spring 15 can simply be removed from the retaining groove.

[0053] In another embodiment, the support ring 12 is provided with a threaded hole communicating with its internal space. The connector assembly 1 further includes a locking screw, which is threadedly engaged with the support ring 12 so that after the support ring 12 is rotated to a set position, the locking screw locks the support ring 12 onto the connector body 11. By connecting the screw to the support ring 12 threadedly and abutting against the connector body 11, the purpose of fixing the support ring 12 is achieved. This method is simple to operate and convenient to use.

[0054] In this embodiment, the outer periphery of the support ring 12 is also provided with an anti-slip structure. By providing the anti-slip structure, it is convenient for the operator to rotate the support ring 12.

[0055] In this embodiment, please refer to Figure 3 The outer periphery of the tube body 2 is provided with a sealing component 22, which is used to abut and seal against the side wall of the tube column.

[0056] Specifically, the sealing component 22 is adapted to the tubing column. When the tubing 2 is inserted into the tubing column, the sealing component 22 can abut against the side wall of the tubing column, thereby achieving a sealing effect.

[0057] Further, please refer to Figure 3 To prevent the sealing assembly 22 from moving axially, the well completion tubing sealing device also includes two limiting rings 23. The limiting rings 23 are sleeved on the outer periphery of the tubing body 2. The two limiting rings 23 are arranged vertically at opposite ends of the sealing assembly 22, thereby limiting the movement of the sealing assembly 22.

[0058] Furthermore, the sealing assembly 22 includes a sealing ring, which is fitted around the outer periphery of the tube and is used to abut against the side wall of the tube column for sealing.

[0059] In this embodiment, please refer to Figure 1 The sealing assembly 22 is provided in multiple ways, and the multiple sealing assemblies 22 are arranged at intervals along the vertical direction.

[0060] Specifically, in order to improve the sealing performance, a plurality of sealing components 22 are arranged at intervals along the axial direction on the outer periphery of the tube body 2.

[0061] To better understand this utility model, the following is combined with... Figures 1 to 5 The technical solution of this utility model is described in detail below:

[0062] In practical use, after assembling the connector assembly 1 and the tube body 2, remove the limiting snap ring 15, move the bearing ring 12 downward to disengage the spline groove 122 and the external spline 112, then rotate the bearing ring 12 circumferentially to keep the through hole 121 concentric with the through channel 21, then move the bearing ring 12 upward to engage the spline groove 122 and the external spline 112, and finally install the limiting snap ring 15 into the slot to restrict the bearing ring 12. When moving downwards, first lower the next production tubing into the well, connect this device to the production tubing, and pass the cable through the crossing channel 21 and use the cable sealing joint to position and seal the cable. After the cable passes through the upper end of the crossing channel 21, it continues to pass through the crossing hole 121 of the bearing ring 12. Then lower this device into the well. When this device is lowered to the position where the tailpipe is hooked back to the sealing cylinder, slowly insert this device into the back sealing cylinder until the bearing ring 12 contacts the top of the back sealing cylinder and press down a certain amount of tonnage.

[0063] In the tailpipe perforation operation of this application, the production string does not need to be lowered into the packer, making the operation simpler and the cost lower.

[0064] This application adopts a packing-type sealing structure. Practical application has proven that the pressure bearing capacity of this sealing structure can reach 10,000 Psi. Compared with the packer system, this sealing structure has a higher sealing level and more reliable sealing performance.

[0065] The pipe body 2 described in this application adopts an integral structure, and the cavity size of the pipe body 2 matches the size of the oil pipe, so as not to affect the production channel.

[0066] This application is easy to insert and remove, and makes subsequent maintenance or other operations easier to perform.

[0067] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A well completion string sealing device, characterized in that, It includes: The pipe body has an outer periphery for sealing against the side wall of the pipe column, a cavity for oil and gas transportation, and a through passage spaced apart from the cavity. The through passage is used to adapt to and allow cables to pass through.

2. The well completion string sealing device according to claim 1, characterized in that, Cable sealing connectors are provided at both ends of the passageway; and / or The crossing passage has multiple sections.

3. The well completion string sealing device according to claim 1, characterized in that, The well completion tubing sealing device also includes a connector assembly. The connector assembly has a connecting channel in the middle. One end of the connector assembly is connected to one end of the tubing body, and the connecting channel is connected to the tubing cavity. The other end of the connector assembly is used to connect to external equipment.

4. The well completion string sealing device according to claim 3, characterized in that, The connector assembly is also provided with through holes spaced apart from the connection channel, the through holes being used to adapt to the cable and allow the cable to pass through.

5. The well completion string sealing device according to claim 4, characterized in that, The connector assembly includes a connector body and a bearing ring. One end of the connector body is connected to one end of the pipe body. The connection channel is located on the connector body. The bearing ring is sleeved on the outer periphery of the connector body. The through hole is located on the bearing ring.

6. The well completion string sealing device according to claim 5, characterized in that, The connector body and the pipe body are detachably connected.

7. The well completion string sealing device according to claim 6, characterized in that, The bearing ring is rotatably mounted on the joint body so that the through hole can be rotated to correspond to the through channel.

8. The well completion string sealing device according to claim 7, characterized in that, The outer periphery of the connector body is provided with an external spline, and one end of the bearing ring is provided with a spline groove. The bearing ring is movably arranged along the axial direction of the connector body so that when the bearing ring rotates to a set position, the bearing ring engages with the spline of the connector body to restrict the rotation of the bearing ring.

9. The well completion string sealing device according to claim 1, characterized in that, The outer periphery of the tube is provided with a sealing component, which is used to abut and seal against the side wall of the tube column.

10. The well completion string sealing device according to claim 9, characterized in that, The sealing assembly is provided in multiple ways, and the multiple sealing assemblies are arranged at intervals along the vertical direction.

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