A high-load-bearing wet cable joint and method for injection molding

Abstract

The present invention relates to a glue-injected high-load wet cable connector and method, and belongs to the technical field of cable connection of submersible screw pumps. The technical scheme is: a downwardly inclined cable hole is opened on the outer wall of the bailer connector and is connected to the inner cavity of the outer shell of the bailer. The inner cavity of the outer shell of the bailer is provided with a lower butt joint. A small flat cable connector is arranged in the cable hole of the bailer connector, one end of which is connected to the lower butt joint, and the other end is connected to the motor; the bailer middle shell is arranged in the cavity at the upper part of the outer shell of the bailer, the outer surface of the inner cavity of the bailer matches the inner wall of the bailer middle shell, and the inner cavity of the bailer is provided with an upper butt joint matched with the lower butt joint. The beneficial effects of the present invention are: it is possible to realize the lowering of cables into the well alone, and to easily achieve docking, thereby avoiding cable damage caused by bumping and squeezing. Through internal glue injection, the pressure bearing capacity of the small flat cable connector is significantly increased, and the cable also reduces the failure caused by sealing.

Description

Technical Field

[0001] The invention relates to a glue-injected high-load wet cable joint and a method thereof, belonging to the technical field of cable connection of a submersible screw pump. Background Art

[0002] Submersible screw pump oil production is a newly developed mechanical oil production process system in recent decades. It is widely used in the oil production field because it is suitable for high-viscosity and high-sand content original mining operations, suitable for offshore operating platforms, can realize inclined well and horizontal well operations, has no rod pipe wear and low manufacturing cost.

[0003] The cable of a traditional submersible screw pump is tied to the outside of the oil pipe and connected to the motor through a large flat cable, a bailer and a small flat cable. When the cable is lowered into the well, it is easy to be squeezed between the casing and the oil pipe, causing cable damage. When encountering an inclined well, the deformation of the casing is more likely to cause cable damage. The motor and the small flat cable joint commonly used in the existing technology are only sealed with a sealing ring. The downhole pressure is high, reaching about 25Mpa at 2000 meters underground, and the well fluid is also corrosive to the sealing ring, which can easily cause the sealing ring to fail. Summary of the invention

[0004] The purpose of the present invention is to provide a glue-injected high-load wet cable joint and method, which can realize the cable being lowered into the well alone and can easily achieve docking, avoiding cable damage caused by bumps and extrusion. Through internal glue injection, the pressure-bearing capacity of the small flat cable joint is significantly increased, and the cable also reduces failures caused by sealing, thereby solving the problems existing in the background technology.

[0005] The technical solution of the present invention is:

[0006] A glue-injected high-load wet cable joint comprises a scoop joint, a small flat cable joint, a scoop outer shell, a lower butt joint, an upper butt joint, a scoop inner cavity and a scoop middle shell. The lower part of the scoop joint is connected to a screw pump, the upper part of the scoop joint is connected to the scoop outer shell, and the scoop outer shell is connected to an oil pipe. A downwardly inclined cable hole is opened on the outer wall of the scoop joint and communicates with the inner cavity of the scoop outer shell. The inner cavity of the scoop outer shell is provided with a lower butt joint. The small flat cable joint is arranged in the cable hole of the scoop joint, and one end is connected to the lower butt joint. The first end is connected to the first end of the bailer, and the other end is connected to the motor; the shell of the bailer is arranged in the cavity at the upper part of the outer shell of the bailer, the outer surface of the inner cavity of the bailer matches the inner wall of the shell of the bailer, the inner cavity of the bailer is provided with an upper butt joint matched with the lower butt joint, the upper butt joint is connected to the large flat cable, and the large flat cable is connected to the power supply; the bailer joint is provided with a first glue injection hole, the space between the small flat cable joint and the lower butt joint is filled with glue, the inner cavity of the bailer is provided with a second glue injection hole, the space around the upper butt joint in the inner cavity of the bailer is filled with glue. It not only fixes the connection, but also improves the sealing performance and insulation performance.

[0007] The small flat cable connector is composed of an outer shell and an internal terminal. The small flat cable enters the outer shell and is connected to the internal terminal. The output end of the internal terminal is connected to the lower connector. The outer shell is provided with a high-load glue injection hole, and the space around the internal terminal is filled with glue. This not only fixes the connection, but also improves the sealing performance and insulation performance.

[0008] The outer surface of the inner cavity of the bailer is provided with a longitudinal positioning groove, and the inner wall of the shell of the bailer is provided with a longitudinal guide block matching the positioning groove. By matching the positioning groove with the longitudinal guide block, the inner cavity of the bailer can be smoothly placed into the shell 7 of the bailer, and the lower butt joint is connected with the upper butt joint to transmit the power supply to the motor.

[0009] A method for using a glue-injected high-load wet cable joint, using the above-mentioned glue-injected high-load wet cable joint, the steps are as follows:

[0010] The lower part of the bailer joint is connected to the screw pump, the upper part of the bailer joint is connected to the outer shell of the bailer, and the outer shell of the bailer is connected to the oil pipe; the small flat cable joint is externally connected to the small flat cable and is connected to the motor of the screw pump, and the space around the internal terminal (glue injection cavity 1) is filled with glue through the high-load glue injection hole, and the space between the small flat cable joint and the lower butt joint (glue injection cavity 2) is filled with glue through the glue injection hole 1, and the bailer joint, the small flat cable joint, the outer shell of the bailer, the lower butt joint and the bailer middle shell are assembled and lowered into the well together with the screw pump; Fill the space around the upper butt joint in the inner cavity of the bailer (glue injection cavity 3) with glue through the glue injection hole 2 on the inner cavity of the bailer; lower the upper butt joint and the inner cavity of the bailer into the well together with the large flat cable in the oil pipe, put the inner cavity of the bailer into the inner shell of the bailer through the longitudinal guide block on the inner wall of the shell of the bailer and the positioning groove on the outer surface of the inner cavity of the bailer, connect the lower butt joint with the upper butt joint, and transmit the power supply to the motor of the screw pump through the large flat cable, the upper butt joint, the lower butt joint, the small flat cable connector and the small flat cable.

[0011] The screw pump works to transport the pumped well fluid through the oil hole along the gap between the outer shell 3 of the bailer and the inner shell of the bailer to the oil pipe and then to the ground.

[0012] The connection of the lower butt joint and the upper butt joint in the well is a well-known and commonly used technology in the art.

[0013] The injection glue used in the present invention is the cable insulation glue known and used in the art.

[0014] The beneficial effects of the present invention are as follows: the cables can be lowered into the well individually and can be easily docked, thus avoiding cable damage caused by bumps and squeezes; through internal glue injection, the pressure bearing capacity of the small flat cable joints is significantly increased, and the cable also reduces failures caused by sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of a fishing device joint according to an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of a small flat cable connector according to an embodiment of the present invention;

[0018] In the figure: bailer connector 1, small flat cable connector 2, bailer outer shell 3, lower butt connector 4, upper butt connector 5, bailer inner cavity 6, bailer middle shell 7, glue injection hole 1-1, oil hole 1-2, high-load glue injection hole 2-1, glue injection hole 2 6-1, cable hole 8, glue injection cavity 1 9, glue injection cavity 2 10, glue injection cavity 3 11, outer shell 12, internal wiring terminal 13, screw pump connection hole 14, cable connector fixing hole 15, cable connector flange 16. DETAILED DESCRIPTION

[0019] The present invention will be further described below by way of embodiments with reference to the accompanying drawings.

[0020] A glue-injected high-load wet cable joint comprises a scoop joint 1, a small flat cable joint 2, a scoop outer shell 3, a lower butt joint 4, an upper butt joint 5, a scoop inner cavity 6 and a scoop middle shell 7. The lower part of the scoop joint 1 is connected to a screw pump, the upper part of the scoop joint 1 is connected to the scoop outer shell 3, and the scoop outer shell 3 is connected to an oil pipe; a downwardly inclined cable hole 8 is opened on the outer wall of the scoop joint 1 and communicates with the inner cavity of the scoop outer shell 3; a lower butt joint 4 is provided in the inner cavity of the scoop outer shell 3; the small flat cable joint 2 is arranged in the cable hole 8 of the scoop joint 1, and one end is connected to the lower butt joint 4. The first end is connected to the first end of the dredger, and the other end is connected to the motor; the shell 7 of the dredger is arranged in the cavity at the upper part of the outer shell 3 of the dredger, the outer surface of the inner cavity 6 of the dredger matches the inner wall of the shell 7 of the dredger, the inner cavity 6 of the dredger is provided with an upper butt joint 5 matched with the lower butt joint 4, the upper butt joint 5 is connected to the large flat cable, and the large flat cable is connected to the power supply; the dredger connector 1 is provided with a glue injection hole 1-1, the space between the small flat cable connector 2 and the lower butt joint 4 is filled with glue, the inner cavity 6 of the dredger is provided with a glue injection hole 2-6-1, the space around the upper butt joint 5 in the inner cavity 6 of the dredger is filled with glue. It not only fixes the connection, but also improves the sealing performance and insulation performance.

[0021] The small flat cable connector 2 is composed of an outer shell 12 and an internal wiring terminal 13. The small flat cable enters the outer shell 12 and is connected to the internal wiring terminal 13. The output end of the internal wiring terminal 13 is connected to the lower connector 4. The outer shell 12 is provided with a high-load glue injection hole 2-1, and the space around the internal wiring terminal 13 is filled with glue. This not only fixes the connection, but also improves the sealing performance and insulation performance.

[0022] The internal connection terminals 13 of the small flat cable connector 2 are three conductors distributed in a circle, which are respectively connected to the three conductors distributed in a circle on the lower connector 4 .

[0023] The upper butt joint 5 has three conductors distributed around its circumference and is connected to the large flat cable.

[0024] The outer surface of the inner cavity 6 of the bailer is provided with a longitudinal positioning groove, and the inner wall of the shell 7 of the bailer is provided with a longitudinal guide block matching the positioning groove. By matching the positioning groove with the longitudinal guide block, the inner cavity 6 of the bailer can be smoothly placed into the shell 7 of the bailer, and the lower docking joint 4 is connected with the upper docking joint 5 to transmit the power supply to the motor.

[0025] The fishing device joint 1 is provided with an oil hole 1-2 which is connected to the oil pipe, and the screw pump transports the well fluid to the ground through the oil hole 1-2 and the oil pipe.

[0026] A screw pump connection hole 14 is provided at the lower end of the bailer joint 1 and is connected to the screw pump via bolts.

[0027] A cable connector flange 16 is provided on the outer shell of the small flat cable connector 2, and a cable connector fixing hole 15 is provided next to the cable hole 8 of the bailer connector 1. The cable connector flange 16 is fixed in the cable hole 8 by screws matching the cable connector fixing hole 15.

[0028] A method for using a glue-injected high-load wet cable joint, using the above-mentioned glue-injected high-load wet cable joint, the steps are as follows:

[0029] The lower part of the bailer joint 1 is connected to the screw pump, and the upper part of the bailer joint 1 is connected to the bailer outer shell 3, and the bailer outer shell 3 is connected to the oil pipe; the small flat cable joint 2 is externally connected to the small flat cable and is connected to the motor of the screw pump, and the space around the internal terminal 13 (glue injection cavity 19) is filled with glue through the high-load glue injection hole 2-1, and the space between the small flat cable joint 2 and the lower docking joint 4 (glue injection cavity 2 10) is filled with glue through the glue injection hole 1-1, and the bailer joint 1, the small flat cable joint 2, the bailer outer shell 3, the lower docking joint 4 and the bailer middle shell 7 are assembled and lowered into the well together with the screw pump. ; Fill the space around the upper butt joint 5 in the inner cavity 6 of the bailer (the third butt joint 11) with glue through the glue injection hole 2 6-1 on the inner cavity 6 of the bailer; lower the upper butt joint 5 and the inner cavity 6 of the bailer into the well together with the large flat cable in the oil pipe, and put the inner cavity 6 of the bailer into the inner shell 7 of the bailer by matching the longitudinal guide block on the inner wall of the shell 7 of the bailer with the positioning groove on the outer surface of the inner cavity 6 of the bailer, and connect the lower butt joint 4 with the upper butt joint 5, and deliver the power supply to the motor of the screw pump through the large flat cable, the upper butt joint 5, the lower butt joint 4, the small flat cable connector 2 and the small flat cable.

[0030] The screw pump works to transport the pumped well fluid through the oil holes 1-2 along the gap between the outer shell 3 of the bailer and the inner shell 7 of the bailer to the oil pipe and then to the ground.

Claims

1. A glue-injected high-load wet cable joint, characterized in that: The invention comprises a bailer joint (1), a small flat cable joint (2), a bailer outer shell (3), a lower butt joint (4), an upper butt joint (5), a bailer inner cavity (6) and a bailer middle shell (7). The lower part of the bailer joint (1) is connected to a screw pump, the upper part of the bailer joint (1) is connected to the bailer outer shell (3), and the bailer outer shell (3) is connected to an oil pipe. A downwardly inclined cable hole (8) is provided on the outer wall of the bailer joint (1) and is communicated with the inner cavity of the bailer outer shell (3). The inner cavity of the bailer outer shell (3) is provided with a lower butt joint (4). The small flat cable joint (2) is arranged in the cable hole (8) of the bailer joint (1), one end of which is connected to the lower butt joint (4), and the other end of which is connected to the lower butt joint (4). The scooping device is connected to a motor of a screw pump; the scooping device middle shell (7) is arranged in a cavity at the upper part of the scooping device outer shell (3); the outer surface of the scooping device inner cavity (6) matches the inner wall of the scooping device middle shell (7); the scooping device inner cavity (6) is provided with an upper butt joint (5) matched with the lower butt joint (4); the upper butt joint (5) is connected to a large flat cable; the large flat cable is connected to a power supply; the scooping device joint (1) is provided with a first glue injection hole (1-1), and the space between the small flat cable joint (2) and the lower butt joint (4) is filled with glue; the scooping device inner cavity (6) is provided with a second glue injection hole (6-1), and the space around the upper butt joint (5) in the scooping device inner cavity (6) is filled with glue; The small flat cable connector (2) is composed of an outer shell (12) and an internal wiring terminal (13); the small flat cable enters the outer shell (12) and is connected to the internal wiring terminal (13); the output end of the internal wiring terminal (13) is connected to the lower connector (4); a high-load-bearing glue injection hole (2-1) is provided on the outer shell (12), and the space around the internal wiring terminal (13) is filled with glue; The outer surface of the inner cavity (6) of the bailer is provided with a longitudinal positioning groove (6-2), and the inner wall of the middle shell (7) of the bailer is provided with a longitudinal guide block matching the positioning groove. The inner cavity (6) of the bailer is placed into the middle shell (7) of the bailer through the matching of the positioning groove and the longitudinal guide block, and the lower butt joint (4) is connected to the upper butt joint (5); A cable connector flange (16) is provided on the outer shell of the small flat cable connector (2), and a cable connector fixing hole (15) is provided next to the cable hole (8) of the bailer connector (1). The cable connector flange (16) is fixed in the cable hole (8) by screws matching the cable connector fixing hole (15).

2. The glue-injected high-load wet cable joint according to claim 1, characterized in that: The internal connection terminals (13) of the small flat cable connector (2) are three conductors distributed in a circle, and are respectively connected to the three conductors distributed in a circle on the lower connector (4).

3. A glue-injected high-load wet cable joint according to claim 1 or 2, characterized in that: The upper butt joint (5) has three conductors distributed around its circumference and is connected to a large flat cable.

4. A glue-injected high-load wet cable joint according to claim 1 or 2, characterized in that: The bailer joint (1) is provided with an oil hole (1-2) which is connected to the oil pipe, and the screw pump transports the well fluid to the ground through the oil hole (1-2) and the oil pipe.

5. A glue-injected high-load wet cable joint according to claim 1 or 2, characterized in that: The lower end of the bailer joint (1) is provided with a screw pump connection hole (14) which is connected to the screw pump via bolts.

6. A method for using a glue-injected high-load wet cable joint, using the cable joint defined in any one of claims 1 to 5, characterized in that Follow these steps: The lower part of the bailer connector (1) is connected to the screw pump, and the upper part of the bailer connector (1) is connected to the outer shell (3) of the bailer, and the outer shell (3) of the bailer is connected to the oil pipe; the small flat cable connector (2) is externally connected to the small flat cable and is connected to the motor of the screw pump; the space around the internal wiring terminal (13) is filled with glue through the high-load glue injection hole (2-1); the space between the small flat cable connector (2) and the lower butt joint (4) is filled with glue through the glue injection hole 1 (1-1); the bailer connector (1), the small flat cable connector (2), the outer shell (3), the lower butt joint (4) and the bailer middle shell (7) are assembled and lowered into the well together with the screw pump; The space around the upper butt joint (5) in the inner cavity (6) of the bailer is filled with glue through the second glue injection hole on the upper butt joint (5) of the inner cavity (6) of the bailer; the upper butt joint (5) and the inner cavity (6) of the bailer are lowered into the well together with the large flat cable in the oil pipe; the inner cavity (6) of the bailer is placed into the inner shell (7) of the bailer by matching the longitudinal guide block on the inner wall of the middle shell (7) of the bailer with the positioning groove on the outer surface of the inner cavity (6) of the bailer; the lower butt joint (4) is connected with the upper butt joint (5); and the power supply is transmitted to the motor of the screw pump through the large flat cable, the upper butt joint (5), the lower butt joint (4), the small flat cable connector (2) and the small flat cable.

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