Sealing and fixing device for suspension joint of cable penetrating sleeve and using method of sealing and fixing device

Abstract

The invention relates to a cable penetrating sleeve suspension joint sealing and fixing device and a use method. According to the technical scheme, a first protective sleeve and a second protective sleeve are installed at the two ends of a copper pipe respectively, a cable core wire is installed in an inner cavity of the copper pipe, a sealing assembly is installed at one end of the outer wall of the copper pipe, a fixing assembly is installed at the other end of the outer wall of the copper pipe, the sealing assembly and the fixing assembly are in contact sealing with the inner wall of a sleeve suspension connector, and the lower end fixes the copper pipe. The cable has the beneficial effects that the adopted protective sleeve not only plays a role in sealing a gap between the cable core wire and the copper pipe, but also separates the cable core wire from the copper pipe, so that the problem of short circuit caused by exposure of a copper wire of the cable core wire due to contact abrasion between a lead layer of the cable core wire and the copper pipe caused by vibration during operation of an electric pump unit is prevented; the copper pipe protects and seals the cable core wire, the situation that the cable steel belt clip falls into a well and cuts the cable core wire is prevented, the taper sleeve and the semi-ring taper are pressed by the pressing screw pipe, the copper pipe is fixed and prevented from moving, the installation is simple in the construction process, and the sealing is reliable.

Description

Technical Field

[0001] The invention relates to the technical field of cable crossing technology for heavy oil dilution or water injection electric submersible pump wells, and in particular to a cable crossing casing suspension joint sealing and fixing device and a use method thereof. Background Art

[0002] During the construction of the heavy oil well dilution or water injection electric submersible pump well operation in the mechanical exploitation of the oil field, the small flat cable core wire of the electric submersible pump motor passing through the bridge casing needs to strip the outer cable armor before passing through the casing suspension joint, separate the small flat cable core wire, and then wear a copper tube outside each branch core wire for protection, and pass through the casing suspension joint together. Install a sealing component between the copper tube and the suspension joint for sealing. In order to prevent the copper tube from moving up or down due to pressure difference, it is also necessary to fix the copper tube that passes through. Due to size limitations, the maximum diameter of the screw hole of the 5½in casing suspension joint through the cable core wire is 18mm, and the outer diameter of the lead layer of the small flat cable core wire passing through is about 9mm, so the outer diameter and inner diameter of the seal are both small, forming three gaps between the seal and the suspension joint, the seal and the copper tube, and the copper tube and the cable core wire, all of which need to be sealed, so the seal adopts external sealing and end face compression sealing. In order to prevent the copper tube from moving up or down due to pressure difference, the copper tube needs to be fixed. Considering that when the sealed motor cable core wire passes through the copper tube, the edge of the inner hole at the end of the copper tube can easily scratch the protective lead layer of the cable core wire. Under the action of the well fluid pressure, the well fluid passes through the weak points of the protective layer, causing the cable core wire to contact the well fluid and short-circuit, damaging the electric pump motor unit or burning the motor cable, causing the electric pump unit to fail to operate normally. Summary of the invention

[0003] The purpose of the present invention is to address the above-mentioned defects in the prior art and to provide a cable crossing sleeve suspension joint sealing and fixing device and a method of use, which is convenient for construction, has simple installation during the construction process, saves operation time, has reliable sealing, and has a high pressure resistance value.

[0004] The present invention relates to a cable passing through casing suspension joint sealing and fixing device, the technical scheme of which is as follows: comprising a first protective sleeve (1), a copper tube (3), a compression screw tube (5), a short seal (8), a long seal (10), a cone sleeve (11), a semi-ring cone (12), and a second protective sleeve (13), wherein the first protective sleeve (1) and the second protective sleeve (13) are respectively installed at both ends of the copper tube (3), a cable core wire (2) is installed in the inner cavity of the copper tube (3), a sealing component is installed at one end of the outer wall of the copper tube (3), and a fixing component is installed at the other end, and the sealing component and the fixing component are contacted and sealed with the inner wall of the casing suspension joint (4); the sealing component includes The invention comprises a short seal (8) and a long seal (10), wherein the short seal (8) and the long seal (10) are sequentially arranged in three axial holes on one side of the copper tube (3) and the sleeve suspension joint (4), and the upper sides of the short seal (8) and the long seal (10) are fixedly connected by a clamping screw (5); the fixing assembly comprises a cone sleeve (11), a semi-ring cone (12) and a fixing screw (5), wherein the cone sleeve (11) is installed in the three axial holes at the lower end of the sleeve suspension joint (4), the semi-ring cone (12) is installed on the lower side of the copper tube (3) and pushed into the cone sleeve (11), and the clamping screw (5) is installed on the lower side of the semi-ring cone (12) to clamp and fix the copper tube.

[0005] Preferably, a gasket (6) is installed between the short seal (8) and the compression spiral tube (5).

[0006] Preferably, a sealing groove is provided at the upper end of the short seal (8) for mounting the first sealing ring (7), and one or more second sealing rings (9) are provided on the outer side of the long seal (10).

[0007] Preferably, the upper end surface of the long seal (10) is provided with a sealing groove for mounting the first sealing ring (7).

[0008] Preferably, the first protective sleeve (1) comprises a tapered outer edge (1.1) with a smooth transition between the cable core and the outer circumference of the copper tube (3), a protective sleeve body (1.2) having an outer diameter equal to that of the copper tube, a limiting end (1.3) in contact with the end face of the copper tube (3), and a filling section (1.4) between the copper tube (3) and the cable core. The protective sleeve body (1.2) is made of rubber material, and a tapered outer edge (1.1) is provided on the outer side of the protective sleeve body (1.2). The other end of the protective sleeve body (1.2) is provided with a limiting end (1.3), and a filling section (1.4) between the copper tube (3) and the cable core.

[0009] Preferably, the outer diameter of the above-mentioned limiting filling section (1.4) is smaller than the outer diameter of the protective sleeve body (1.2), and the difference between the outer diameters of the two is greater than the gap between the copper tube (3) and the cable core wire (2).

[0010] The method for using the cable penetration sleeve suspension joint sealing and fixing device mentioned in the present invention comprises the following process: 1. Install the second protective cover (13) on the lower end of the copper tube (3), and pass it through a cable core (2) of the small flat cable, with the lower end of the copper tube (3) in a smooth transition state, and then wrap the lower end of the copper tube (3) with a sealing tape; 2. Complete the insertion of the remaining two cable cores (2) into the copper tube (3), and install the second protective cover (13) and wrap the sealing tape around the lower end of the copper tube (3); 3. Place the compression screw (5) with the square end facing downward and the end with the larger inner diameter of the cone sleeve (11) facing downward, and put it on the overall structure of the copper tube (3) and the cable core wire (2). Lift the pipe column, bend the small flat cable, and insert the copper tube (3) into the three axial holes of the casing suspension joint (4); push the cone sleeve (11) into the lower end hole of the casing suspension joint (4); 4. Install the long seal (10) with the second seal ring (9), the short seal (8), the first seal ring (7), and the gasket (6) on the upper part of the copper tube (3), and then install them one by one into the three upper axial holes of the casing suspension joint (4), and then install the upper compression screw (5) and tighten it; 5. Install two semi-annular cones (12) along the lower side of the copper tube (3), push the semi-annular cones (12) into the cone sleeve (11), and then tighten the lowermost compression screw (5) to fix the copper tube (3), and similarly complete the fixation of the other two copper tubes (3); 6. Finally, the first protective sleeve (1) is installed on the upper end of the copper tube (3), and a sealing tape is used to wrap and seal the upper end of the copper tube (3).

[0011] Preferably, the sealing tape is wrapped from top to bottom, with two layers in opposite directions, and the length is increased layer by layer, and three layers are wrapped.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The first protective cover and the second protective cover used in the present invention play the role of sealing the gap between the cable core wire and the copper tube; the cable core wire is centered in the copper tube, and the cable core wire and the copper tube are separated, so as to prevent the problem of short circuit caused by the contact and wear of the lead layer of the cable core wire and the copper tube due to vibration during the operation of the electric pump unit, resulting in the exposure of the copper wire of the cable core wire; Second, the copper tube used in the present invention protects and seals the cable core wire, prevents the cable steel band clip from falling into the well and cutting the cable core wire, and seals the three axial holes of the casing suspension joint; 3. The compression screw tube used in the present invention compresses and fixes the gasket, short seal and long seal of the passing part, so that they are firmly compressed together. In addition, the gasket can compress the first sealing ring between the gasket and the short seal, as well as the first sealing ring between the long seal and the short seal, to seal the gap between the copper tube and the sealing assembly; The present invention is suitable for electric submersible pump wells for heavy oil blending or water injection. A bridge casing is lowered into the wellbore, and the electric pump unit is lowered into the bridge casing. The motor cable can not only pass through the suspension joint of the bridge casing, but also realize the sealing and fixation of the passing part, thereby ensuring the reliability of injecting thin oil or water. The cone sleeve and the semi-ring cone are compressed by a compression screw to fix the copper tube to prevent the copper tube from moving upward or downward, thereby avoiding damage to the cable lead layer protective layer, and avoiding short-circuit burning of the cable core wire or cable disconnection. The present invention is convenient for construction, simple to install during the construction process, saves operation time, has reliable sealing, and has a high withstand voltage value. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 yes Figure 1 An enlarged schematic diagram of Part I in FIG. Figure 3 yes Figure 1 An enlarged schematic diagram of Part II in FIG. Figure 4 yes Figure 1 An enlarged schematic diagram of Part III in FIG. Figure 5 is a schematic diagram of the structure of a first protective cover; In the above figure: first protective sleeve 1, cable core 2, copper tube 3, sleeve suspension joint 4, compression screw 5, gasket 6, first sealing ring 7, short seal 8, second sealing ring 9, long seal 10, cone sleeve 11, semi-ring cone 12, second protective sleeve 13, tapered outer edge 1.1, protective sleeve body 1.2, limit end 1.3 and filling section 1.4. DETAILED DESCRIPTION

[0014] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0015] Example 1, reference Figure 1-Figure 5The present invention relates to a sealing and fixing device for a cable passing through a casing suspension joint, comprising a first protective sleeve 1, a copper tube 3, a compression screw 5, a short seal 8, a long seal 10, a cone sleeve 11, a semi-ring cone 12, and a second protective sleeve 13. The first protective sleeve 1 and the second protective sleeve 13 are respectively installed at both ends of the copper tube 3. The inner cavity of the copper tube 3 is installed with a cable core wire 2. A sealing component is installed at one end of the outer wall of the copper tube 3, and a fixing component is installed at the other end. The sealing component and the fixing component are contacted and sealed with three axial holes of the casing suspension joint 4; the sealing component comprises a short seal 8 and a long seal 10, and the short seal 8 and the long seal 10 are respectively installed with the first protective sleeve 1 and the second protective sleeve 13. The seal 10 is installed in the three axial holes of the copper tube 3 and the sleeve suspension joint 4 in sequence, and the outer sides of the short seal 8 and the long seal 10 are compressed and fixed by the clamping screw 5; the sealing ring 7 and the sealing ring 9 are respectively installed in the upper inner groove of the short seal 8, the upper inner groove of the long seal 10 and the outer circular sealing groove of the long seal 10; the fixing assembly consists of a cone sleeve 11 and a semi-ring cone 12, the cone sleeve 11 is installed in the three axial holes at the lower end of the sleeve suspension joint 4, the semi-ring cone 12 is installed to the lower end of the copper tube 3, the cone sleeve 11 is clamped to the outer side of the copper tube 3, and the clamping screw 5 is installed at the lower end of the semi-ring cone 12 and the copper tube 3 is tightened and fixed.

[0016] A gasket 6 is installed between the short seal 8 and the compression spiral tube 5.

[0017] One end of the short seal 8 is provided with a sealing groove for installing the first sealing ring 7, and the outer side of the long seal 10 is provided with one or more second sealing rings 9.

[0018] Reference Figure 5 The first protective cover 1 mentioned in the present invention comprises a tapered outer edge 1.1 with a smooth transition between the cable core and the outer circle of the copper tube 3, a protective cover body 1.2 with an outer diameter equal to that of the copper tube, a limiting end 1.3 in contact with the end face of the copper tube 3, and a filling section 1.4 in the gap between the copper tube 3 and the cable core. The protective cover body 1.2 is made of rubber material, and a tapered outer edge 1.1 is provided on the outer side of the protective cover body 1.2, and a limiting end 1.3 is provided at the other end of the protective cover body 1.2, and a filling section 1.4 in the gap between the copper tube 3 and the cable core.

[0019] The outer diameter of the filling section 1.4 is smaller than the outer diameter of the protective sleeve body 1.2, and the difference between the outer diameters of the two is larger than the gap between the copper tube 3 and the cable core wire 2.

[0020] 1. The first protective cover and the second protective cover used in the present invention play the role of sealing the gap between the cable core wire and the copper tube; the cable core wire is centered in the copper tube, and the cable core wire and the copper tube are separated, so as to prevent the problem of short circuit caused by the contact and wear of the lead layer of the cable core wire and the copper tube due to vibration during the operation of the electric pump unit, resulting in the exposure of the copper wire of the cable core wire; Second, the copper tube used in the present invention protects and seals the cable core wire, prevents the cable steel belt clip from falling into the well and cutting the cable core wire, and seals the gap between the casing suspension joint; 3. The compression screw tube used in the present invention compresses and fixes the gasket, short seal and long seal of the passing part, so that they are firmly fixed together. In addition, the gasket can compress the first sealing ring between the gasket and the short seal, and the second sealing ring between the long seal and the short seal, so as to seal the gap between the copper tube and the sealing assembly; The method for using the cable penetration sleeve suspension joint sealing and fixing device mentioned in the present invention comprises the following process: 1. Install the second protective cover 13 on the lower end of the copper tube 3, and pass it through a cable core 2 of the small flat cable, with the lower end of the copper tube 3 in a smooth transition state, and then wrap the lower end of the copper tube 3 with a sealing tape; 2. Complete the insertion of the remaining two cable cores 2 into the copper tube 3, and install the second protective cover 13 and the sealing tape around the lower end of the copper tube 3; 3. Place the square end of the compression screw 5 downward and the end with the larger inner diameter of the cone sleeve 11 downward, and put it on the overall structure of the copper tube 3 and the cable core 2. Lift the pipe column, bend the small flat cable, and insert the copper tube 3 into the three axial holes of the casing suspension joint 4; push the cone sleeve 11 into the lower end hole of the casing suspension joint 4; Fourth, the long seal 10 with the second seal ring 9, the first seal ring 7, the short seal 8, the first seal ring 7, the gasket 6 are installed on the upper part of the copper tube 3, and then installed into the three axial holes on the upper part of the casing suspension joint 4 one by one, and then the upper compression screw 5 is installed and tightened; Fifth, install two semi-ring cones 12 along the lower side of the copper tube 3, push the semi-ring cones 12 into the cone sleeve 11, and then tighten the bottom compression screw 5 to fix the copper tube 3, and similarly complete the fixation of the other two copper tubes 3; 6. Finally, install the first protective cover 1 on the upper end of the copper tube 3, and use a sealing tape to complete the wrapping and sealing of the upper end of the copper tube 3.

[0021] Among them, the method used when wrapping the sealing tape mentioned above is: from top to bottom, two layers in reverse, lengthening layer by layer, and wrapping three layers.

[0022] The present invention is suitable for electric submersible pump wells for heavy oil dilution or water injection. A bridge casing is lowered into the wellbore, and the electric pump unit is lowered into the bridge casing. The motor cable can not only pass through the suspension joint of the bridge casing, but also realize the sealing of the passing part, thereby ensuring the reliability of injecting thin oil or water, and preventing the copper tube from moving upward or downward, avoiding damage to the cable lead layer protective layer, and avoiding short-circuit burning of the cable core wire or cable disconnection. The present invention is convenient for construction, simple to install during the construction process, saves operation time, has reliable sealing, and has a high withstand voltage value.

[0023] Embodiment 2, a sealing and fixing device for a cable passing through a casing suspension joint mentioned in the present invention, comprises a first protective sleeve 1, a copper tube 3, a compression screw 5, a short seal 8, a long seal 10, a cone sleeve 11, a semi-ring cone 12, and a second protective sleeve 13, wherein the first protective sleeve 1 and the second protective sleeve 13 are respectively installed at both ends of the copper tube 3, the inner cavity of the copper tube 3 is installed with a cable core wire 2, a sealing component is installed at one end of the outer wall of the copper tube 3, and a fixing component is installed at the other end, and the sealing component and the fixing component are contacted and sealed with the three axial holes of the casing suspension joint 4; the sealing component It includes a short seal 8 and a long seal 10, which are arranged in sequence in the three axial holes of the copper tube 3 and the sleeve suspension joint 4, and the upper ends of the short seal 8 and the long seal 10 are fixedly connected by a clamping screw 5; the fixing assembly consists of a cone sleeve 11, a semi-ring cone 12 and a clamping screw 5, the cone sleeve 11 is installed in the three axial holes at the lower end of the sleeve suspension joint 4, the semi-ring cone 12 is installed at the lower end of the copper tube 3, and the semi-ring cone 12 cooperates with the cone sleeve 11, and the clamping screw 5 is installed on the lower side of the semi-ring cone 12 to tighten and fix the copper tube 3.

[0024] The difference from Example 1 is: One end face of the long seal 10 mentioned in the present invention is provided with a sealing groove for installing the first sealing ring 7, which can achieve a better sealing effect.

[0025] The above are only some preferred embodiments of the present invention. Any person skilled in the art may modify the above technical solutions or modify them into equivalent technical solutions. Therefore, the corresponding simple modifications or equivalent transformations made according to the technical solutions of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A cable penetration casing suspension joint sealing and fixing device, characterized by: The invention comprises a first protective sleeve (1), a copper tube (3), a compression screw (5), a short seal (8), a long seal (10), a cone sleeve (11), a semi-annular cone (12), and a second protective sleeve (13); the first protective sleeve (1) and the second protective sleeve (13) are respectively installed at two ends of the copper tube (3); a cable core (2) is installed in the inner cavity of the copper tube (3); a sealing component is installed at one end of the outer wall of the copper tube (3); a fixing component is installed at the other end; and the sealing component and the fixing component are contacted and sealed with the inner wall of the sleeve suspension joint (4); the sealing component comprises a short seal (8) and a long seal (10). The short seal (8) and the long seal (10) are sequentially arranged in three axial holes on one side of the copper tube (3) and the sleeve suspension joint (4), and the upper sides of the short seal (8) and the long seal (10) are fixedly connected by a clamping screw (5); the fixing assembly consists of a cone sleeve (11), a semi-ring cone (12) and a fixing screw (5); the cone sleeve (11) is installed in the three axial holes at the lower end of the sleeve suspension joint (4), the semi-ring cone (12) is installed on the lower side of the copper tube (3) and pushed into the cone sleeve (11), and the clamping screw (5) is installed on the lower side of the semi-ring cone (12) to clamp and fix the copper tube.

2. The cable passing sleeve suspension joint sealing and fixing device according to claim 1 is characterized in that: A gasket (6) is installed between the short seal (8) and the compression screw tube (5).

3. The cable passing sleeve suspension joint sealing and fixing device according to claim 2 is characterized in that: One end of the short seal (8) is provided with a sealing groove for mounting a first sealing ring (7), and one or more second sealing rings (9) are provided on the outer side of the long seal (10).

4. The cable passing sleeve suspension joint sealing and fixing device according to claim 3 is characterized in that: One end surface of the long seal (10) is provided with a sealing groove for mounting the first sealing ring (7).

5. The cable passing sleeve suspension joint sealing and fixing device according to claim 4 is characterized in that: The first protective sleeve (1) comprises a tapered outer edge (1.1) with a smooth transition between the cable core and the outer circumference of the copper tube (3), a protective sleeve body (1.2) with an outer diameter equal to that of the copper tube, a limiting end (1.3) in contact with the end face of the copper tube (3), and a filling section (1.4) between the copper tube (3) and the cable core. The protective sleeve body (1.2) is made of rubber material, and a tapered outer edge (1.1) is provided on the outer side of the protective sleeve body (1.2). The other end of the protective sleeve body (1.2) is provided with a limiting end (1.3), and a filling section (1.4) between the copper tube (3) and the cable core.

6. The cable passing sleeve suspension joint sealing and fixing device according to claim 5 is characterized in that: The outer diameter of the position-limiting filling section (1.4) is smaller than the outer diameter of the protective sleeve body (1.2), and the difference between the outer diameters of the two is greater than the gap between the copper tube (3) and the cable core wire (2).

7. The method for using the cable passing sleeve suspension joint sealing and fixing device according to claim 6 is characterized by: The process includes the following:

1. Install the second protective cover (13) on the lower end of the copper tube (3), and pass it through a cable core (2) of the small flat cable, with the lower end of the copper tube (3) in a smooth transition state, and then wrap the lower end of the copper tube (3) with a sealing tape; 2. Complete the insertion of the remaining two cable cores (2) into the copper tube (3), and install the second protective cover (13) and wrap the sealing tape around the lower end of the copper tube (3); 3. Place the compression screw (5) with the square end facing downward and the end with the larger inner diameter of the cone sleeve (11) facing downward, and put it on the overall structure of the copper tube (3) and the cable core wire (2). Lift the pipe column, bend the small flat cable, and insert the copper tube (3) into the three axial holes of the casing suspension joint (4); push the cone sleeve (11) into the lower end hole of the casing suspension joint (4); 4. Install the long seal (10) with the second seal ring (9), the short seal (8), the first seal ring (7), and the gasket (6) on the upper part of the copper tube (3), and then install them one by one into the three upper axial holes of the casing suspension joint (4), and then install the upper compression screw (5) and tighten it; 5. Install two semi-annular cones (12) along the lower side of the copper tube (3), push the semi-annular cones (12) into the cone sleeve (11), and then tighten the lowermost compression screw (5) to fix the copper tube (3), and similarly complete the fixation of the other two copper tubes (3); 6. Finally, the first protective sleeve (1) is installed on the upper end of the copper tube (3), and a sealing tape is used to wrap and seal the upper end of the copper tube (3).

8. The method for using the cable passing sleeve suspension joint sealing and fixing device according to claim 7 is characterized by: When wrapping the sealing tape, start from top to bottom, with two layers in opposite directions, lengthen each layer, and wrap three layers.

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