Oil pipe anti-channeling device

Abstract

The utility model relates to the technical field of oil field well repair, in particular to an oil pipe channeling prevention device which aims at solving the technical problems that an existing oil pipe channeling prevention measure is prone to missing the optimal blowout wrecking opportunity, and a coupling collides with a blowout preventer flashboard. The oil pipe anti-channeling device comprises a sleeve, the sleeve is provided with an inner cavity, a boss is arranged on the inner wall of the sleeve, the boss is used for abutting against the end face of a coupling, a large hole channel and a small hole channel are formed in the inner cavity, the large hole channel is used for inserting the coupling, and the small hole channel is used for penetrating a plug valve; the plurality of riggings are uniformly distributed around the axis of the sleeve at intervals, one end of each rigging is connected with the sleeve, and the other end of each rigging is connected to a casing large four-way joint or a wellhead blowout preventer. The oil pipe anti-channeling device is simple in structure and can be quickly mounted; in addition, by determining the length of the rigging, the oil pipe channeling prevention device can control the channeling height of the oil pipe, the coupling is prevented from impacting a flashboard of a blowout preventer, and therefore well control safety is effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield well repair, in particular to an oil pipe anti-channeling device. Background Art

[0002] During the well repair operation in the oil field, due to the influence of many factors such as long-term production suspension causing displacement of formation energy, dead oil cap at the bottom of the casing, or dead oil blockage at the bottom of the oil pipe, it is very easy to cause sudden wellhead overflow during the process of raising and lowering the oil pipe during minor repair operation. If there are not many oil pipes left in the well, the oil pipe may be pushed up and out of the wellhead, thereby causing an uncontrolled blowout.

[0003] At present, the anti-channeling measures on site are either to install an anti-channeling short joint or to use a blowout preventer, but both methods have certain disadvantages. Among them, the anti-channeling short joint (1m oil pipe short joint + plug valve) requires two people to lift and install, while the blowout preventer (1 oil pipe + plug valve + oil pipe short joint) needs to be hoisted by a well repair rig to complete. The tools are large and heavy, resulting in a long installation time and difficulty in installation, and it is easy to miss the best time to rush to blow out. In addition, after the successful installation, the oil pipe will be pushed up due to the pressure in the well. When it reaches a certain height, the coupling on the oil pipe will directly hit the blowout preventer gate, which can easily cause damage to the blowout preventer gate, affect the seal, and cause well control to lose control. Utility Model Content

[0004] The utility model aims to provide an oil pipe anti-channeling device to solve the technical problems that the existing oil pipe anti-channeling measures are prone to miss the best time to rush to blow out and there is a problem of couplings hitting the blowout preventer gate.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] The oil pipe anti-channeling device provided by the utility model comprises: a sleeve, the sleeve having an inner cavity, a boss provided on the inner wall of the sleeve, the boss being used to abut against the end face of the coupling and forming a large channel and a small channel in the inner cavity, wherein the large channel is used to insert the coupling and the small channel is used to penetrate the plug valve;

[0007] A plurality of riggings are spaced and evenly distributed around the axis of the sleeve, one end of the rigging is connected to the sleeve, and the other end is connected to the casing spool or the wellhead blowout preventer.

[0008] Furthermore, an annular groove with a length of L is formed between the coupling and the plug valve;

[0009] The thickness of the boss is T, 5mm<T<L.

[0010] Furthermore, one end of the boss away from the large channel is provided with a chamfer.

[0011] Furthermore, a hanging ear is provided on the outer wall of the sleeve, and the hanging ear corresponds to the rigging one by one and is connected to the rigging.

[0012] Furthermore, the hanging ear and the sleeve are integrally formed, or the hanging ear and the sleeve are welded.

[0013] Furthermore, the rigging includes a draw rope, which is connected between the hanging ear and the casing spool, or between the hanging ear and the wellhead blowout preventer.

[0014] Furthermore, the pull rope is a steel wire rope or a sling.

[0015] Furthermore, the rigging further includes a connector, and the connector is arranged on the hanging ear;

[0016] One end of the pull rope is arranged on the connector.

[0017] Furthermore, the connector includes a shackle, and the shackle is arranged on the hanging ear.

[0018] Furthermore, the shackle is rotatably connected to the hanging ear via a pin, and the axis of the pin is perpendicular to the axis of the sleeve.

[0019] In summary of the above technical solutions, the oil pipe anti-channeling device provided by the present invention can achieve the following technical effects:

[0020] In this oil pipe anti-channeling device, the sleeve can be installed on the coupling through the large channel and the coupling can be limited by the boss; through the small channel, the plug valve can achieve threaded connection with the coupling; through the rigging, the casing large four-way or the wellhead blowout preventer can achieve the limitation of the sleeve.

[0021] In specific applications, the appropriate length of the rigging is determined according to the wellhead height, and one end of the rigging is connected to the sleeve, and the other end is fixed to the appropriate position of the casing large four-way or the wellhead blowout preventer, and then the sleeve is placed at the appropriate position of the wellhead; when overflow is found and the well needs to be shut in, the wellhead personnel directly put the sleeve on the coupling of the first oil pipe at the wellhead, and then install the plug valve on the coupling, and complete the well shut-in according to the normal blowout procedure; when the oil pipe is in a state of upward movement, after the rigging is tightened, the rigging and the sleeve will apply reverse tension to the coupling to prevent the oil pipe from rising.

[0022] It can be seen that compared with the existing technology, the oil pipe anti-channeling device has a simple structure and can be installed quickly; in addition, by determining the rigging length, the oil pipe anti-channeling device can control the upward channeling height of the oil pipe, preventing the coupling from hitting the blowout preventer gate, thereby effectively ensuring well control safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of an application of the oil pipe anti-channeling device provided in an embodiment of the utility model;

[0025] Figure 2 A partial cross-sectional view of a sleeve provided in an embodiment of the present utility model;

[0026] Figure 3 It is a structural schematic diagram of the connection between the upper part of the coupling and the lower part of the plug valve.

[0027] Icon: 1-sleeve; 11-boss; 12-hanging ear;

[0028] 2-coupling; 3-plug valve;

[0029] 4-rigging; 41-pulling rope;

[0030] 5- Annular groove. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0033] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0034] At present, the anti-channeling measures on site are either to install an anti-channeling short joint or to use a blowout preventer, but both methods have certain disadvantages. Among them, the anti-channeling short joint (1m oil pipe short joint + plug valve) requires two people to lift and install, while the blowout preventer (1 oil pipe + plug valve + oil pipe short joint) needs to be hoisted by a well repair rig to complete. The tools are large and heavy, resulting in a long installation time and difficulty in installation, and it is easy to miss the best time to rush to blow out. In addition, after the successful installation, the oil pipe will be pushed up due to the pressure in the well. When it reaches a certain height, the coupling on the oil pipe will directly hit the blowout preventer gate, which can easily cause damage to the blowout preventer gate, affect the seal, and cause well control to lose control.

[0035] In view of this, the present invention provides an oil pipe anti-channeling device, including a sleeve 1, the sleeve 1 has an inner cavity, and a boss 11 is provided on the inner wall of the sleeve 1, the boss 11 is used to abut against the end face of the coupling 2, and form a large channel and a small channel in the inner cavity, wherein the large channel is used to insert the coupling 2, and its aperture is slightly larger than the outer diameter of the coupling 2, and the small channel is used to penetrate the plug valve 3; multiple rigging 4, the multiple rigging 4 are spaced and evenly distributed around the axis of the sleeve 1, one end of the rigging 4 is connected to the sleeve 1, and the other end is connected to the casing large four-way or the wellhead blowout preventer.

[0036] In the oil pipe anti-channeling device, the sleeve 1 can be sleeved on the coupling 2 through the large channel, and the coupling 2 is limited by the boss 11; through the small channel, the plug valve 3 can be threadedly connected to the coupling 2; through the rigging 4, the casing large four-way or the wellhead blowout preventer can limit the sleeve 1.

[0037] In specific applications, the appropriate length of the rigging 4 is determined according to the wellhead height, and one end of the rigging 4 is connected to the sleeve 1, and the other end is fixed to the appropriate position of the casing large four-way or the wellhead blowout preventer, and then the sleeve 1 is placed at the appropriate position of the wellhead; when overflow is found and the well needs to be shut in, the wellhead personnel directly put the sleeve 1 on the coupling 2 of the first oil pipe at the wellhead, and then install the plug valve 3 on the coupling 2, and complete the well shut-in according to the normal blowout procedure; when the oil pipe rises, after the rigging 4 is tightened, the rigging 4 and the sleeve 1 apply reverse tension to the coupling 2 to prevent the oil pipe from rising.

[0038] It can be seen that compared with the existing technology, the oil pipe anti-channeling device has a simple structure and can be installed quickly; in addition, by determining the length of the rigging 4, the oil pipe anti-channeling device can control the upward channeling height of the oil pipe, preventing the coupling 2 from hitting the blowout preventer gate, thereby effectively ensuring well control safety.

[0039] The following combination Figures 1 to 3 The structure and shape of the oil pipe anti-channeling device provided in this embodiment are described in detail:

[0040] Further, combined Figure 2 and Figure 3As shown, an annular groove 5 with a length of L is formed between the coupling 2 and the plug valve 3; the thickness of the boss 11 is T, 5mm<T<L.

[0041] Specifically, T can be 5.5 mm, 6 mm, or 6.5 mm. The length of L is related to the length of the reduced diameter section of the plug valve 3, which will not be elaborated here. This design ensures that the boss 11 can withstand a certain force to effectively limit the butt collar 2. Furthermore, it also ensures that the connecting section of the plug valve 3 is fully connected to the butt collar 2, establishing an effective seal between the plug valve 3 and the butt collar 2.

[0042] Optionally, refer to Figure 2 The upper end of the boss 11 is provided with a chamfer, so that the plug valve 3 is conveniently installed.

[0043] In this embodiment, reference Figure 1 and Figure 2 A hanging ear 12 is provided on the outer wall of the sleeve 1, and the hanging ear 12 corresponds to the rigging 4 one by one and is connected to the rigging 4.

[0044] Optionally, the lug 12 is integrally formed with the sleeve 1 or welded to the sleeve 1, thereby ensuring tensile strength. Optionally, two lugs 12 are provided, and the two lugs 12 are symmetrically distributed about the axis of the sleeve 1. This design ensures that the sleeve 1 is evenly stressed and is easy to handle when assembled.

[0045] Regarding Rigging 4, specifically:

[0046] The rigging 4 includes a draw rope 41 and a connector; one end of the draw rope 41 is fixed to the casing spool or the wellhead blowout preventer, and the other end is connected to the connector. Optionally, the draw rope 41 is a wire rope or a sling; the connector can be a shackle, a D-ring or a safety hook, which is set on the hanging ear 12. Optionally, the connector is a shackle, and the shackle is rotatably connected to the hanging ear 12 through a pin shaft. Here, the axis of the pin shaft is perpendicular to the axis of the sleeve 1.

[0047] In the above, the pull rope 41 is a soft connection, which is convenient for adjusting the length, easy to use, and can adapt to more scenarios; the pull rope 41 is connected to the hanging ear 12 through a shackle, which can reduce the wear of the pull rope 41 during the tightening process and ensure the safety of construction.

[0048] The application process of the oil pipe anti-channeling device provided in this embodiment is as follows:

[0049] Connect one end of the two riggings 4 to the opening position of the corresponding hanging lug 12 respectively, and adjust the rigging 4 to the appropriate length according to the wellhead height, and fix the other ends of the two riggings 4 to the appropriate positions on both sides of the large four-way of the casing or on both sides of the wellhead blowout preventer; then place the connected oil pipe anti-channeling device at the appropriate position of the wellhead. When overflow is found and the well needs to be shut down, the wellhead personnel directly put the sleeve 1 on the coupling 2 of the first oil pipe at the wellhead, and install the plug valve 3 on the coupling 2, and then complete the well closing according to the normal emergency blowout procedure. When the oil pipe flows upward, the purpose of preventing the oil pipe from flowing upward can be achieved under the joint reverse pulling force of the rigging 4 and the sleeve 1.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oil pipe anti-channeling device, characterized in that: include: A sleeve (1), wherein the sleeve (1) has an inner cavity, and a boss (11) is provided on the inner wall thereof, wherein the boss (11) is used to abut against the end face of a coupling (2) and form a large channel and a small channel in the inner cavity, wherein the large channel is used to insert the coupling (2) and the small channel is used to penetrate a plug valve (3); a plurality of rigging (4), wherein the plurality of rigging (4) are spaced and evenly distributed around the axis of the sleeve (1), one end of the rigging (4) is connected to the sleeve (1), and the other end is connected to a casing spool or a wellhead blowout preventer.

2. The oil pipe anti-channeling device according to claim 1, characterized in that: An annular groove (5) with a length of L is formed between the coupling (2) and the plug valve (3); The thickness of the boss (11) is T, 5mm<T<L.

3. The oil pipe anti-channeling device according to claim 1, characterized in that: One end of the boss (11) away from the large channel is provided with a chamfer.

4. The oil pipe anti-channeling device according to claim 1, characterized in that: The outer wall of the sleeve (1) is provided with a hanging ear (12), and the hanging ear (12) corresponds to the rigging (4) one by one and is connected to the rigging (4).

5. The oil pipe anti-channeling device according to claim 4, characterized in that: The hanging ear (12) and the sleeve (1) are integrally formed, or the hanging ear (12) and the sleeve (1) are welded.

6. The oil pipe anti-channeling device according to claim 4, characterized in that: The rigging (4) comprises a draw rope (41), and the draw rope (41) is connected between the hanging lug (12) and the casing spool, or between the hanging lug (12) and the wellhead blowout preventer.

7. The oil pipe anti-channeling device according to claim 6, characterized in that: The pull rope (41) is a steel wire rope or a sling.

8. The oil pipe anti-channeling device according to claim 6, characterized in that: The rigging (4) further comprises a connector, wherein the connector is arranged on the hanging ear (12); One end of the pull rope (41) is arranged on the connector.

9. The oil pipe anti-channeling device according to claim 8, characterized in that: The connector comprises a shackle, and the shackle is arranged on the hanging ear (12).

10. The oil pipe anti-channeling device according to claim 9, characterized in that: The shackle is rotatably connected to the hanging ear (12) via a pin shaft, and the axis of the pin shaft is perpendicular to the axis of the sleeve (1).

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