Electric pump well immovable tubular column cable lossless maintenance structure

Abstract

The utility model relates to the technical field of heavy oil recovery, and discloses an electric pump well immovable tubular column cable lossless maintenance structure which comprises an oil pipe, a heavy oil electric pump body is arranged on the oil pipe, a casing pipe valve is arranged on the heavy oil electric pump body, and a connecting bent pipe is fixedly spliced to one side of the heavy oil electric pump body. The side, away from the heavy oil electric pump body, of the connecting bent pipe is detachably spliced with a lengthening long pipe through a first flange, and the free end of the high-density connecting pipe is provided with a split type high-density assembly. According to the utility model, when a cable main body in a pipeline needs to be inspected, a wrench is used for dismounting the fastening pressing cap, dismounting the flange screw on the outer side connecting disc, installing the return pipe at the position corresponding to the stainless steel shell, slowly opening the flanges, and simultaneously using the return pipe to push out the stainless steel shell in the direction opposite to the first flange of the oil pipe; therefore, opening of the forked split type high-density assembly can be achieved on the premise that a tubular column is not moved and a cable is not damaged.

Description

Technical Field

[0001] This utility model relates to the field of heavy oil extraction technology, and in particular to a non-destructive maintenance structure for the cable of a stationary tubing in an electric pump well. Background Technology

[0002] Currently, the technology for crossing the wellhead with cables in heavy oil electric pump wells involves fixing the cable to the pump tubing string, then exiting from a casing valve on one side at the wellhead. After passing through a short-circuit connector, the cable is connected in three separate parts to a single-strand high-pressure crossing seal body, then passes through a flange-type high-pressure sealer (generally referred to as "high-density" in production sites), and finally connects to the surface cable. A sealing ring is installed on the single-strand high-pressure crossing seal body to complete the seal with the flange-type "high-density" shell, and pressure caps are used to secure the single-strand high-pressure crossing seal body at both ends.

[0003] This technology of crossing the wellhead with cables for heavy oil electric pump wells effectively seals the cable to the outside of the wellbore, ensuring normal production even under the large pressure difference between the inside and outside of the pump well.

[0004] A search revealed a novel electric pump string suitable for heavy oil extraction, disclosed in application number 201120137146.2. This string, belonging to the category of downhole oil production equipment, mainly consists of tubing, cable, downhole intelligent switch, positive flush valve, centrifugal pump, separator, protector, motor, extended flow guide, variable coupling, tubing, mixer, screen pipe, and plug. The positive flush valve primarily comprises a valve body, retaining ring, limit sleeve, valve ball, working seat, upper support seat, spring, lower support seat, and adjusting nut. The working seat has four axially evenly distributed flushing holes, and the upper support seat, spring, lower support seat, and adjusting nut are sequentially installed below the working seat. The extended flow guide is installed outside the motor, and its sealing ring is installed on the tubing section at the upper end of the centrifugal pump. This technical solution avoids direct contact between injected water and the cable, protecting the cable and extending the pump inspection cycle; it also increases the dilution depth, extends the pump entry time of the mixed solution, improves the mixing effect, and reduces the viscosity at the pump entry point.

[0005] According to the search application number 202010216810.6, a tubing structure and process method for an integrated injection and production of a submersible electric pump with a heat-insulated tank is adopted, which adopts the following steps: 1. The process tubing is lowered into the production casing; 2. When the steam injection is in operation, (1) the main steam injection channel is established by pressurization; (2) the sealing device is closed to prevent steam from entering the heat-insulated flow guide device from the annulus between the heat-insulated oil pipe and the production casing; (3) nitrogen is injected into the annulus for heat insulation; (4) high-temperature steam is injected into the heat-insulated oil pipe; 3. ① After the steam injection and well shut-in are completed, the fluid is transported from the heat-insulated oil pipe channel to the wellhead; ② After the oil pressure is released to 0, the casing pressure is released to 0; 4. 1) When the cycle production is switched, the tubing joint is cut off to the steam injection channel; 2) the production channel of the submersible electric pump system is established, and the high-temperature fluid at the bottom of the well is lifted to the wellhead, thereby realizing the normal production state of the electric pump. This invention not only improves the thermal energy utilization rate of heavy oil wells, but also enhances the ability of offshore platforms to develop heavy oil wells with 350°C steam injection.

[0006] However, through exploration, the inventor discovered that the existing technical solutions still have the following defects: the technology for crossing the wellhead with cables in heavy oil electric pump wells also has the following shortcomings: when the insulation of the unit and cable drops or even returns to zero during the production of the electric pump well, it is necessary to carefully check the condition of the surface cable inside the bifurcated "high-density" section; with the current technology, only the appearance of the connection point with the surface cable can be inspected. If it is necessary to disassemble the bifurcated "high-density" section to check the condition of the cable inside the pipeline, the fastening bolts at the bifurcated "high-density" section must be removed first, and then the cable must be cut off. After cutting off the cable, it is found that there is no problem inside the bifurcated "high-density" section, and it cannot be restored without damage, and it is impossible to perform non-destructive testing on the inside of the pipeline.

[0007] Therefore, we propose a non-destructive maintenance structure for the cable of an electric pump well without moving the tubing string. Summary of the Invention

[0008] The present invention mainly addresses the technical problems existing in the prior art by providing a non-destructive maintenance structure for the stationary pipeline cable of an electric pump well.

[0009] To achieve the above objectives, this utility model adopts the following technical solution: a non-destructive maintenance structure for the cable of an electric pump well with a stationary tubing string, including an oil pipe, a heavy oil electric pump body mounted on the oil pipe, a casing valve mounted on the heavy oil electric pump body, a connecting bend fixedly spliced ​​to one side of the heavy oil electric pump body, and an extended short pipe detachably spliced ​​to the side of the connecting bend away from the heavy oil electric pump body via a first flange, with a pressure gauge mounted on the first flange. The oil pipe, along with the heavy oil electric pump body, is positioned in the wellhead. The cable body extends outward along the oil pipe, the connecting bend, and the extended short pipe. A high-density connecting pipe is detachably installed at the free end of the extended short pipe via a second flange. A split high-density assembly is mounted at the free end of the high-density connecting pipe. A protective pipe is fixedly installed on the outer surface of the split high-density assembly. Finally, the cable body will pass through the split high-density assembly and distribute outward through the protective pipe, connecting to the ground cable.

[0010] Preferably, the split-type high-density assembly includes a connecting plate and a split plate. The connecting plate is fixedly connected to the free end of the high-density connecting pipe, and the split plate is detachably installed between the two sets of connecting plates by means of fish-tail bolts.

[0011] Preferably, the split disk has three sets of cable branch holes, which are arranged in a circular array with the center of the split disk as the center. When the cable body passes through the split high-density assembly, the cable body is composed of three branches, and the cable body is divided into three branches, which extend outward through the corresponding cable branch holes.

[0012] Preferably, a limiting tube is fixedly installed inside the cable branch hole, and a stainless steel shell is movably installed inside the cable branch hole. The limiting tube and the stainless steel shell are coaxially arranged. An inner sleeve is fixedly sleeved inside the stainless steel shell, and the main body of the cable, which is divided into single-strand branches, extends outward through the inner sleeve.

[0013] Preferably, the outer surface of the stainless steel shell is provided with an annular groove and a sealing ring is provided inside the annular groove, and a fastening cap is threaded onto the free end of the stainless steel shell.

[0014] Preferably, the stainless steel outer shell has a limiting boss at the end opposite to the fastening cap.

[0015] Preferably, the structure of the limiting boss is adapted to the structure of the limiting tube.

[0016] Preferably, a hollow oil filling cylinder is provided between the two sets of first flanges, and a connecting seat is provided on the oil filling cylinder. The lower end of the pressure gauge is provided with a hollow threaded bolt, and the pressure gauge is threadedly connected to the connecting seat through the threaded bolt. Multiple oil filling holes are provided through the outer wall surface of the threaded bolt. Beneficial effects

[0017] This utility model provides a non-destructive maintenance structure for the cable of a stationary tubing in an electric pump well. It has the following beneficial effects: (1) When it is necessary to inspect the cable body inside the split high-density assembly, the fastening cap is removed with a wrench, the flange screws on the outer connecting plate are unscrewed, the return pipe is installed at the position corresponding to the stainless steel shell, the flange is slowly opened, and the stainless steel shell is pushed out in the opposite direction to the first flange of the oil pipe using the return pipe. This allows the split high-density assembly to be opened without moving the tubing or damaging the cable, thus facilitating the inspection of the condition of the internal cable body and achieving the effect of convenient and non-destructive maintenance of the cable.

[0018] (2) The non-destructive maintenance structure for the electric pump well stationary pipe string cable, through the setting of the connecting bend, makes the position of the split high-density assembly lower than the height of the oil pipe. During use, lubricating oil is injected into the pipeline through the installation port where the pressure gauge is located, so that the pipeline tends to the side of the split high-density assembly and is immersed in the lubricating oil environment, thereby achieving the effect of extending the service life of the cable and extending the maintenance-free period of the cable.

[0019] (3) In the use of this non-destructive maintenance structure for the stationary pipe string cable of the electric pump well, after the main body of the cable passes through the split high-density assembly, it is necessary to fix the fastening cap to the end of the stainless steel shell. At this time, the stainless steel shell is controlled to slide into the valve of the high-density connecting pipe sleeve. The cooperation between the limiting tube and the limiting boss plays a limiting role on the stainless steel shell, so that the stainless steel shell is in a relatively fixed state. At this time, rotating the fastening cap will not cause the stainless steel shell to rotate due to the pressure applied to the fastening cap. This makes it convenient to quickly fasten the fastening cap to the end of the stainless steel shell, achieving the effect of quick installation of the fastening cap. Attached Figure Description

[0020] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0022] Figure 1This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0023] Figure 2 This utility model is a split-type high-density assembly with a three-dimensional structure;

[0024] Figure 3 This is a schematic diagram of the internal planar structure of the stainless steel outer shell of this utility model;

[0025] Figure 4 This is a schematic diagram of the planar structure of the limiting tube and the limiting boss of this utility model;

[0026] Figure 5 This is a schematic diagram of the position and structure of the oil filling cylinder pressure gauge of this utility model.

[0027] Legend:

[0028] 1. Oil pipe; 2. Heavy oil electric pump body; 3. Casing valve; 4. Production pipeline; 5. Connecting bend; 6. First flange; 60. Oil injection cylinder; 61. Connecting seat; 7. Pressure gauge; 70. Threaded bolt; 71. Oil injection hole; 8. Extended short pipe; 9. Second flange; 10. Split-type high-density assembly; 11. Protective pipe; 12. Cable body; 100. Connecting disc; 101. Split disc; 102. Cable branch hole; 103. Stainless steel shell; 104. Sealing ring; 105. Inner sleeve; 106. Fastening cap; 113. Limiting boss; 123. Limiting tube; 13. High-density connecting tube; 14. Return tube. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Example 1

[0033] A non-destructive maintenance structure for stationary tubing and cables in electric pump wells, referenced. Figure 1 The system includes an oil pipe 1, a heavy oil electric pump body 2 mounted on the oil pipe 1, a casing valve 3 mounted on the heavy oil electric pump body 2, a connecting bend 5 fixedly spliced ​​to one side of the heavy oil electric pump body 2, and an extension short pipe 8 detachably spliced ​​to the side of the connecting bend 5 away from the heavy oil electric pump body 2 via a first flange 6. A pressure gauge 7 is mounted on the first flange 6. The oil pipe 1, along with the heavy oil electric pump body 2, is distributed in the wellhead. The in-well cable body 12 extends outward along the oil pipe 1, the connecting bend 5, and the extension short pipe 8.

[0034] Further reference Figure 1 The free end of the extended short pipe 8 is detachably installed with a high-density connecting pipe 13 via a second flange 9. The free end of the high-density connecting pipe 13 is provided with a split high-density assembly 10. A protective pipe 11 is fixedly installed on the outer side of the split high-density assembly 10. Finally, the main cable 12 will pass through the split high-density assembly 10 and be distributed outward through the protective pipe 11 and connected to the ground cable.

[0035] Example 2

[0036] A non-destructive maintenance structure for stationary tubing and cables in electric pump wells, referenced. Figure 2 The cable body 12 is composed of three branch lines. The split high-density assembly 10 includes a connecting plate 100 and a split plate 101. The connecting plate 100 is fixedly connected to the free end of the high-density connecting pipe 13. The split plate 101 is detachably installed between two sets of connecting plates 100 by fish-tail bolts. Three sets of cable branch holes 102 are opened through the split plate 101. The three sets of cable branch holes 102 are arranged in a circular array with the center of the split plate 101 as the center. When the cable body 12 passes through the split high-density assembly 10, the cable body 12 is divided into three branch lines. The three branch lines extend outward through the corresponding cable branch holes 102.

[0037] Example 3

[0038] Based on Embodiment 1 and Embodiment 2, and referring to Figure 3 A limiting tube 123 is fixedly installed inside the cable branch hole 102. A stainless steel shell 103 is movably installed inside the cable branch hole 102. The limiting tube 123 and the stainless steel shell 103 are coaxially arranged. An inner sleeve 105 is fixedly sleeved inside the stainless steel shell 103. The cable body 12, which is divided into single-strand branches, extends outward through the inner sleeve 105. An annular groove is opened on the outer surface of the stainless steel shell 103 and a sealing ring 104 is provided inside the annular groove. A fastening cap 106 is threaded on the free end of the stainless steel shell 103.

[0039] Further reference Figure 3 and Figure 4 The stainless steel shell 103 has a limiting boss 113 at one end away from the fastening cap 106. The structure of the limiting boss 113 is adapted to the structure of the limiting tube 123. In use, after the cable body 12 passes through the split high-density assembly 10, the fastening cap 106 needs to be fastened to the end of the stainless steel shell 103. At this time, the stainless steel shell 103 is controlled to slide into the sleeve valve 3 of the high-density connecting tube 13. The cooperation between the limiting tube 123 and the limiting boss 113 limits the stainless steel shell 103, so that the stainless steel shell 103 is in a relatively fixed state. At this time, rotating the fastening cap 106 will not cause the stainless steel shell 103 to rotate, thus making it easy to quickly fasten the fastening cap 106 to the end of the stainless steel shell 103.

[0040] In traditional technology, the stainless steel housing 103 is always in a movable state. When it is necessary to tighten the pressure cap 106, it is necessary to first use external tools to fix the stainless steel housing 103 with a limit clamp. The operation is cumbersome and requires the assistance of external tools. By setting a limit tube 123 corresponding to the stainless steel housing 103, it is convenient to quickly control the movable state of the stainless steel housing 103, which is conducive to quickly completing the installation of the tightening pressure cap 106.

[0041] Based on Embodiments 1, 2, and 3, when it is necessary to inspect the cable body 12 inside the split high-density assembly 10, use a wrench to remove the fastening cap 106, unscrew the flange bolts on the outer connecting plate 100, install the return tube 14 at the position corresponding to the stainless steel shell 103, slowly open the flange, and at the same time use the return tube 14 to push the stainless steel shell 103 in the opposite direction to the first flange 6 of the oil pipe 1. This allows the split high-density assembly 10 to be opened without moving the pipe column or damaging the cable, thus facilitating the inspection of the condition of the internal cable body 12.

[0042] When installing the split-type high-density assembly 10 for the first time, remove the extension pipe 8, measure and reserve the correct dimensions of the cable body 12, and cut and adjust the length of the extension pipe 8 according to the reserved length of the cable body 12. The adjustable length extension pipe 8 improves the convenience of maintenance and repair.

[0043] Example 4

[0044] A hollow oil filling cylinder 60 is provided between the two sets of first flanges 6. The oil filling cylinder 60 is coaxially arranged with the extended short pipe 8. The oil filling cylinder 60 is interconnected with the connecting bend 5 and the extended short pipe 8. A connecting seat 61 is provided on the oil filling cylinder 60. A hollow threaded bolt 70 is provided at the lower end of the pressure gauge 7. The pressure gauge 7 is threadedly connected to the connecting seat 61 through the threaded bolt 70. Multiple oil filling holes 71 are opened through the outer wall of the threaded bolt 70. In use, rotating the pressure gauge 7 causes the pressure gauge 7 to move into the connecting seat 61 along with the threaded bolt 70. When it is necessary to inject lubricating oil into the connecting bend 5 and the extended short pipe 8, the pressure gauge 7 is rotated in the opposite direction, causing the pressure gauge 7 to move upward with the threaded plug 70 until the oil injection hole 71 is exposed. The lubricating oil is injected into the oil injection cylinder 60 through multiple oil injection holes 71. Finally, the lubricating oil is distributed inside the connecting bend 5 and the extended short pipe 8. By setting the connecting bend 5, the position of the split high-density assembly 10 is lower than the height of the oil pipe 1, so that the pipeline tends to be immersed in the lubricating oil environment on one side of the split high-density assembly 10, thereby extending its service life.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A non-destructive maintenance structure for the stationary tubing and cable of an electric pump well, comprising an oil tubing (1), a heavy oil electric pump body (2) mounted on the oil tubing (1), and a casing valve (3) mounted on the heavy oil electric pump body (2), characterized in that: A connecting bend (5) is fixedly spliced ​​on one side of the heavy oil electric pump body (2). An extended short pipe (8) is detachably spliced ​​on the side of the connecting bend (5) away from the heavy oil electric pump body (2) through a first flange (6). A pressure gauge (7) is installed on the first flange (6). The oil pipe (1) with the heavy oil electric pump body (2) is set and distributed in the wellhead. The cable body (12) in the well extends outward along the oil pipe (1), the connecting bend (5) and the extended short pipe (8). A high-density connecting pipe (13) is detachably installed on the free end of the extended short pipe (8) through a second flange (9). A split high-density assembly (10) is provided on the free end of the high-density connecting pipe (13). A protective pipe (11) is fixedly installed on the outer side of the split high-density assembly (10). Finally, the cable body (12) will pass through the split high-density assembly (10) and be distributed outward through the protective pipe (11) and connected to the ground cable.

2. The non-destructive maintenance structure for the stationary pipeline cable of an electric pump well according to claim 1, characterized in that: The split high-density assembly (10) includes a connecting plate (100) and a split plate (101). The connecting plate (100) is fixedly connected to the free end of the high-density connecting pipe (13), and the split plate (101) is detachably installed between the two sets of connecting plates (100) by means of a fishtail bolt.

3. The non-destructive maintenance structure for the stationary pipeline cable of an electric pump well according to claim 2, characterized in that: The split disk (101) has three sets of cable branch holes (102) through it. The three sets of cable branch holes (102) are arranged in a ring array with the center of the split disk (101) as the center. When the cable body (12) passes through the split high-density assembly (10), the cable body (12) is composed of three branches. The cable body (12) is divided into three branches, and the three branches extend outward through the corresponding cable branch holes (102).

4. The non-destructive maintenance structure for the stationary pipeline cable of an electric pump well according to claim 3, characterized in that: A limiting tube (123) is fixedly installed inside the cable branch hole (102). A stainless steel shell (103) is movably installed inside the cable branch hole (102). The limiting tube (123) and the stainless steel shell (103) are coaxially arranged. An inner sleeve (105) is fixedly sleeved inside the stainless steel shell (103). The main body (12) of the cable, which is divided into single strands, extends outward through the inner sleeve (105).

5. The non-destructive maintenance structure for the stationary pipeline cable of an electric pump well according to claim 4, characterized in that: The outer surface of the stainless steel shell (103) is provided with an annular groove and a sealing ring (104) is provided inside the annular groove. A fastening cap (106) is threaded on the free end of the stainless steel shell (103).

6. The non-destructive maintenance structure for the stationary pipeline cable of an electric pump well according to claim 5, characterized in that: The stainless steel outer shell (103) has a limiting boss (113) at the end away from the fastening cap (106).

7. The non-destructive maintenance structure for the stationary pipeline cable of an electric pump well according to claim 6, characterized in that: The structure of the limiting boss (113) is adapted to the structure of the limiting tube (123).

8. The non-destructive maintenance structure for the stationary pipeline cable of an electric pump well according to claim 1, characterized in that: A hollow oil filling cylinder (60) is provided between the two sets of first flanges (6). A connecting seat (61) is provided on the oil filling cylinder (60). A hollow threaded bolt (70) is provided at the lower end of the pressure gauge (7). The pressure gauge (7) is threadedly connected to the connecting seat (61) through the threaded bolt (70). Multiple oil filling holes (71) are provided through the outer wall surface of the threaded bolt (70).

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