Wellhead device for replacing high-density short section

Abstract

The utility model provides a wellhead device for replacing a high-density short section, which comprises a reducer, a coupling piece and a short connecting piece, the coupling piece and the reducer are arranged at intervals, the coupling piece is used for connecting the high-density short section, and the short connecting piece comprises a first short connecting part arranged between the reducer and the coupling piece. The length value of the second short circuit part is smaller than that of the first short circuit part, the high-density short section is located in the first short circuit part, and the second short circuit part is constructed to be capable of replacing the first short circuit part after the high-density short section breaks down.

Description

Technical Field

[0001] The utility model relates to the technical field of electric pump wells, in particular to a wellhead device used for replacing high-density short joints. Background Art

[0002] With the gradual deepening of the development and exploration of super-heavy oil blocks, the application scale of electric pumps continues to increase. At the same time, due to the shortening of the production cycle of electric pump production wells, during multiple shutdowns, high-density oil may break down during the instantaneous high-current carrying process.

[0003] At present, the existing method of "high-density" connection in the production of electric pump wells is usually: first, after the cable pipe is completed in the electric pump well, the cable is passed through the guide rope from the short-circuit of the oil pipe connected to the casing valve, and tied together with the cable in the wellbore, and the downhole cable is pulled out of the wellbore from the casing valve by raising and lowering the cable pipe; then the downhole cable pulled out of the wellbore is measured and cut off after measuring the length, and connected to the cable on the "high-density" side, and then the cable on the other side of the "high-density" is connected to the ground cable, and the high-density coupling is installed; finally, the cable pipe is lowered, and other installations of all wellheads are completed, and the connection between the ground cable and the junction box, step-up transformer and control cabinet is completed.

[0004] Although the "high-density" connection technology used in this electric pump well is mature, highly applicable, and plays an important role in crude oil production, it still has the following shortcomings: Cable breakdown at the "high-density" point and insulation resistance returning to zero are one of the key points of problems with the electric pump well cable, but problems are very likely to occur here. The usual treatment method is to dismantle the wellhead and lift a cable tube to remove the broken "high-density" and reconnect a new "high-density". This not only takes a long time for maintenance, but also increases the operating cost.

[0005] Therefore, it is desired in the art to provide a wellhead device for replacing high-density short joints to solve the above technical problems. Utility Model Content

[0006] The purpose of the utility model is to provide a wellhead device for replacing high-density short joints, which can realize the replacement of high-density short joints without moving the wellhead, thereby not only effectively solving the problem of reducing oil production costs, but also simplifying the on-site construction process to facilitate practical on-site application.

[0007] According to the utility model, a wellhead device for replacing a high-density short joint is provided, comprising a reducer, a coupling member arranged at intervals from the reducer and used for connecting the high-density short joint, and

[0008] A short-circuit, the short-circuit comprising a first short-circuit portion arranged between the reducer and the coupling member, and a second short-circuit portion having a smaller length than the first short-circuit portion,

[0009] The high-density short section is located in the first short-connection portion, and the second short-connection portion is configured to replace the first short-connection portion after the high-density short section fails.

[0010] In one embodiment, the second short-circuit portion occupies one half to one third of the length of the first short-circuit portion.

[0011] In one embodiment, the high-density short section occupies one tenth to one twentieth of the length of the first short-connection portion, and the distance between the high-density short section and the reducer is greater than the distance between the high-density short section and the coupling member.

[0012] In one embodiment, a cable is disposed in the short-connector, a first end of the cable is connected to a downhole tool, and a second end of the cable extends through the high-density short section and is connected to a junction box.

[0013] In one embodiment, the cable has cable connection packages formed on both sides of the high-density short section.

[0014] In one embodiment, the coupling member comprises a high-voltage coupling sleeved on an end of the first short-connection portion or the second short-connection portion.

[0015] In one embodiment, a transition nipple is provided on the inner wall of the high-voltage coupling.

[0016] The wellhead device also includes a transition coupling that is arranged outside the high-density short section and connected to the transition short section.

[0017] In one embodiment, a clamp skin is filled between the short-circuit piece, the reducer and the high-voltage coupling.

[0018] In one embodiment, the wellhead device further comprises a casing valve arranged at an end of the reducer away from the coupling member.

[0019] In one embodiment, the reducer is configured in the form of a stepped sleeve and includes a first connection portion connected to the sleeve valve and a second connection portion connected to the short-circuit piece, wherein the inner diameter of the first connection portion is smaller than the inner diameter of the second connection portion.

[0020] Compared with the prior art, the advantages of the utility model are:

[0021] Firstly, the utility model can realize the replacement of high-density short joints without moving the wellhead, thereby not only effectively solving the problem of reducing oil production costs, but also simplifying the on-site construction process to facilitate practical on-site application.

[0022] Specifically, when the high-density short section has problems such as cable breakdown and insulation resistance returning to zero, the broken high-density short section can be cut off and replaced with a new high-density short section. The length of the cable will be shortened. Therefore, the length of the cable can be adapted by replacing the longer first short-circuit section with the second short-circuit section, thereby achieving the purpose of replacing the high-density short section without changing the wellhead.

[0023] Secondly, when problems such as cable breakdown and insulation resistance returning to zero occur in high-density short sections, the utility model can quickly handle them by replacing the first short section with a shorter second short section, thereby further simplifying the on-site construction process and effectively shortening the construction time, thereby reducing operating costs.

[0024] In addition, since the distance between the high-density short section and the reducer is larger than the distance between the high-density short section and the coupling member in the initial state, the new high-density short section will be arranged closer to the reducer after replacement, so that it can be more easily adapted to the second short-connection part, so as to further improve the construction efficiency and shorten the construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings, in which:

[0026] Figure 1 The structure of the wellhead device for replacing a high-density short joint according to the utility model is schematically shown;

[0027] Figure 2 It is a state schematic diagram of a wellhead device for replacing a high-density pup joint according to the utility model, which shows the working state after the high-density pup joint is replaced.

[0028] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0029] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict.

[0030] The utility model will be further described below in conjunction with the accompanying drawings.

[0031] Figure 1 The structure of a wellhead device 100 for replacing a high-density short joint according to the utility model is schematically shown;

[0032] Figure 21 is a state schematic diagram of a wellhead device 100 for replacing a high-density pup joint according to the utility model, which shows the working state after the high-density pup joint 12 is replaced.

[0033] like Figures 1-2 As shown, the wellhead device 100 for replacing a high-density short joint according to the utility model mainly comprises a reducer 11 and a coupling member spaced apart from the reducer 11. The coupling member can be connected to the high-density short joint 12, thereby providing effective support for the high-density short joint 12.

[0034] In one embodiment, Figures 1-2 As shown, the wellhead device 100 for replacing a high-density short joint also includes a short-circuit. Preferably, the short-circuit includes a first short-circuit portion 21 disposed between the reducer 11 and the coupling member, and a second short-circuit portion 22. The length of the second short-circuit portion 22 is smaller than the length of the first short-circuit portion 21.

[0035] In the present invention, the high-density short section 12 is in the first short-circuit 21. Preferably, the second short-circuit 22 is configured to replace the first short-circuit 21 after the high-density short section 12 fails. In other words, when the high-density short section 12 has problems such as cable breakdown and insulation resistance returning to zero, the broken high-density short section 12 can be cut off to replace a new high-density short section 12, thereby shortening the length of the cable 13 (described below). Therefore, the length of the cable 13 can be adapted by replacing the longer first short-circuit 21 with the shorter second short-circuit 22, thereby achieving the purpose of replacing the high-density short section 12 without moving the wellhead.

[0036] Compared with the prior art, the present invention can achieve the purpose of replacing the high-density short section 12 without moving the wellhead through the above method, thereby not only effectively solving the problem of reducing oil production costs, but also simplifying the on-site construction process to facilitate practical on-site application.

[0037] In one embodiment, the second short-connection portion 22 occupies one-half to one-third of the length of the first short-connection portion 21, and the high-density short section 12 occupies one-tenth to one-twentieth of the length of the first short-connection portion 21. Therefore, after the old high-density short section 12 is cut off and replaced with a new high-density short section 12, the utility model can quickly process by replacing the longer first short section 21 with the shorter second short section 22, so as to further simplify the on-site construction process and effectively shorten the construction time, thereby reducing the operation cost.

[0038] Preferably, the second short-circuit portion 22 is composed of a plurality of short-circuit parts of different length values. Therefore, after cutting off the old high-density short section 12 and replacing it with a new high-density short section 12, a suitable short-circuit part can be selected according to the actual length requirement, thereby improving the compatibility of the second short-circuit portion 22 and the high-density short section 12, thereby further reducing the operating cost.

[0039] In one embodiment of the utility model, in the initial state, the distance between the high-density short section 12 and the reducer 11 is larger than the distance between the high-density short section 12 and the coupling member. In this way, the new high-density short section 12 after replacement will be arranged closer to the reducer 11, so that it can be more easily adapted to the second short-connection part 22, so as to further improve the construction efficiency and shorten the construction time.

[0040] According to the utility model, if Figures 1-2 As shown, the coupling member includes a high-voltage coupling 31 sleeved on the end of the first short-connection part 21 or the second short-connection part 22. In other words, when the high-density short section 12 is not faulty, the high-voltage coupling 31 is sleeved outside the first short-connection part 21, and when the high-density short section 12 fails, the high-voltage coupling 31 is sleeved outside the second short-connection part 22.

[0041] In one embodiment, Figures 1-2 As shown, a transition nipple 32 is provided on the inner wall of the high-pressure coupling 31, and the wellhead device 100 for replacing the high-density nipple further includes a transition coupling 33 provided outside the high-density nipple 12 and connected to the transition nipple 32. Preferably, the transition nipple 32 and the transition coupling 33 can indirectly connect the high-density nipple 12 and the high-pressure coupling 31, thereby providing an effective support effect for the high-density nipple 12, so as to further improve the stability and firmness of the high-density nipple 12.

[0042] It is worth noting that when the broken high-density short section 12 is cut off to replace a new high-density short section 12, the utility model can decide whether to replace at least one of the second short section 22, the transition short section 32 and the transition coupling 33 according to actual conditions.

[0043] In one embodiment, a clamp skin (not shown) is filled between the short-connector and the reducer 11 and the high-pressure coupling 31. Preferably, the end of the short-connector and the reducer 11 and the high-pressure coupling 31 are compressed by screws, so that the short-connector and the reducer 11 and the high-pressure coupling 31 can be effectively sealed under the action of the clamp skin, so as to improve the safety of the wellhead device 100 used for replacing the high-density short joint.

[0044] In one embodiment, Figures 1-2As shown, a cable 13 is provided in the short connector. Preferably, the first end of the cable 13 is connected to the downhole tool, and the second end of the cable 13 extends through the high-density short section 12 and is connected to the junction box. As a result, when problems such as cable breakdown and insulation resistance returning to zero occur, the high-density short section 12 can be cut off more easily, so that a new high-density short section 12 can be installed on the remaining cable 13 to further shorten the construction specimen, thereby facilitating actual application on site.

[0045] In one embodiment, Figures 1-2 As shown, the cable 13 is formed with a cable connection package 131 on both sides of the high-density short section 12. In the utility model, the cable connection package 131 can not only connect and protect the cable insulation, but also effectively transmit electrical energy and signals at the same time.

[0046] According to the utility model, if Figures 1-2 As shown, the wellhead device 100 for replacing the high-density short joint also includes a casing valve 14 arranged at one end of the reducer 11 away from the coupling. Therefore, the casing valve 14, the reducer 11, the short connector and the coupling can provide a good closed space for the cable 13 and the high-density short joint 12 to ensure that the high-density short joint 12 can work stably.

[0047] In one embodiment, the reducer 11 is configured in a stepped sleeve form and includes a first connection portion connected to the sleeve valve 14 and a second connection portion connected to the short-circuit piece. Preferably, the inner diameter of the first connection portion is smaller than the inner diameter of the second connection portion.

[0048] The working process of the utility model is briefly described below:

[0049] First, install one end of the reducer 11 on the casing valve 14 on either side, and use a guide rope to lead the cable 13 in the wellbore (not shown) out of the casing valve 14, pass through the reducer 11 and place it on the ground, then lower the pipe string to the wellhead, and then do not move the pipe string before drilling.

[0050] Then, the cable 13 is connected to the high-density short section 12 , and the connection among the high-density short section 12 , the transition short section 32 , the transition coupling 33 and the high-voltage coupling 31 is completed.

[0051] Afterwards, the first short-connection part 21 is installed, and the first short-connection part 21 is sealed with the reducer 11 and the high-voltage coupling 31 by means of a clamp.

[0052] Finally, when the high-density short section 12 has problems such as cable breakdown and insulation resistance returning to zero, the well is killed and vented, the high-voltage clamp skin is removed and the first short-circuit part 21 is removed, the old high-density short section 12 is taken out to replace it with a new high-density short section 12, and the second short-circuit part 22 is installed.

[0053] Compared with the prior art, the utility model has the following advantages:

[0054] Firstly, the utility model can realize the replacement of the high-density short joint 12 without moving the wellhead, thereby not only effectively solving the problem of reducing oil production costs, but also simplifying the on-site construction process to facilitate on-site practical application.

[0055] Specifically, when the high-density short section 12 has problems such as cable breakdown and insulation resistance returning to zero, the broken high-density short section 12 can be cut off and replaced with a new high-density short section 12, thereby shortening the length of the cable 13. Therefore, the length of the cable 13 can be adapted by replacing the longer first short-circuit section 21 with the second short-circuit section 22, thereby achieving the purpose of replacing the high-density short section 12 without changing the wellhead.

[0056] Secondly, when the high-density short section 12 has problems such as cable breakdown and insulation resistance returning to zero, the utility model can quickly handle the problem by replacing the first short section 21 with a shorter second short section 22, thereby further simplifying the on-site construction process and effectively shortening the construction time, thereby reducing the operating cost.

[0057] In addition, since the distance between the high-density short section 12 and the reducer 11 is larger than the distance between the high-density short section 12 and the coupling member in the initial state, the new high-density short section 12 will be arranged closer to the reducer 11 after replacement, so that it can be more easily adapted to the second short-connection part 22, so as to further improve the construction efficiency and shorten the construction time.

[0058] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0059] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements.

[0060] For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0061] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the scope of the present invention, and such changes or modifications should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A wellhead device for replacing a high-density short joint, characterized in that: include: Head size (11), a coupling member which is arranged at intervals from the reducer (11) and is used to connect the high-density short section (12); and A short-circuit piece, comprising a first short-circuit portion (21) arranged between the reducer (11) and the coupling member, and a second short-circuit portion (22) having a smaller length than the first short-circuit portion (21). The high-density short section (12) is located in the first short-connection portion (21), and the second short-connection portion (22) is configured to replace the first short-connection portion (21) after the high-density short section (12) fails.

2. The wellhead device for replacing a high-density short joint according to claim 1, characterized in that: The second short-circuit portion (22) occupies one half to one third of the length of the first short-circuit portion (21).

3. The wellhead device for replacing a high-density short joint according to claim 2, characterized in that: The high-density short section (12) occupies one tenth to one twentieth of the length of the first short-connection portion (21), and the distance between the high-density short section (12) and the reducer (11) is greater than the distance between the high-density short section (12) and the coupling member.

4. The wellhead device for replacing a high-density short joint according to claim 3, characterized in that: A cable (13) is arranged in the short-circuit component, a first end of the cable (13) is connected to a downhole tool, and a second end of the cable (13) extends through the high-density short section (12) and is connected to a junction box.

5. The wellhead device for replacing a high-density short joint according to claim 4, characterized in that: The cable (13) is formed with cable connection packages (131) on both sides of the high-density short section (12).

6. The wellhead device for replacing a high-density short joint according to claim 5, characterized in that: The coupling member comprises a high-voltage coupling (31) sleeved on an end of the first short-connection portion (21) or the second short-connection portion (22).

7. The wellhead device for replacing a high-density short joint according to claim 6, characterized in that: A transition nipple (32) is provided on the inner wall of the high-voltage coupling (31). The wellhead device further comprises a transition coupling (33) which is arranged outside the high-density short section (12) and connected to the transition short section (32).

8. The wellhead device for replacing a high-density short joint according to claim 6, characterized in that: A clamp skin is filled between the short-circuit piece, the reducer (11) and the high-voltage coupling (31).

9. The wellhead device for replacing a high-density short joint according to any one of claims 1 to 8, characterized in that: The wellhead device further comprises a casing valve (14) arranged at an end of the reducer (11) away from the coupling member.

10. The wellhead device for replacing a high-density short joint according to claim 9, characterized in that: The reducer (11) is constructed in the form of a stepped sleeve and comprises a first connection portion connected to the sleeve valve (14) and a second connection portion connected to the short-circuit piece, wherein the inner diameter of the first connection portion is smaller than the inner diameter of the second connection portion.

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