Well control device for assisting in well shut-in in coiled tubing fishing operation and using method
By designing a well control device for continuous oil pipe salvage operations, the structure of sealed joints and tile fixers is used to solve the problem of large overflow under drilling conditions, and a safer and simpler shutdown process is achieved.
Patent Information
- Application Number
- CN202311568675.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-22
- Publication Date
- 2025-05-23
AI Technical Summary
Under drilling conditions, the snatch plug cannot pass through the continuous oil pipe lifting card, resulting in large overflow, long shutdown time, high risk of well control, and lack of supporting tools for shutdown of wells for this work.
A well control device for auxiliary shut-off in continuous oil pipe salvage operation is designed, including sealing joints, upper connection joints, caulking fixtures and lower pressing well circulation joints. By rotating the sealing joints and upper connection joints clockwise, the limiting structure and sealing structure are used to achieve sealing and clamping of the continuous oil pipe to reduce overflow.
It shortens the shutdown time, reduces overflow, improves well control safety, avoids the need to cut continuous oil pipes, improves operational safety, and makes up for the defect of overflow without professional tools when using a well repair machine to start continuous oil pipes in the oil pipe.
Smart Images
Figure CN120026848A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of well control equipment for realizing wellhead control in well repair operations, and relates to a well control device for assisting well shut-in in a continuous tubing fishing operation and a use method thereof. Background Art
[0002] During the operation of the coiled tubing in the tubing, due to H 2 The coiled tubing may fall into the well due to corrosion, material defects of the coiled tubing itself, and manual cutting of the coiled tubing after it is stuck.
[0003] When using a workover rig to salvage the coiled tubing, it is necessary to use two sets of coiled tubing square elevators to switch and cut the coiled tubing multiple times to pull out the coiled tubing. If overflow occurs during the process of pulling the coiled tubing, the steps for shutting in the well are as follows: Step 1, cut the coiled tubing at a position 30-45cm above the top surface of the tubing coupling; Step 2, insert the plug from the fracture of the coiled tubing and tighten it with the tubing coupling; Step 3, close the plug valve. The first step is not affected by any factors. The time to complete a cutting of the coiled tubing is 6-8 minutes. Under the condition of overflow, the fluid spraying in the well has a great impact on the operator's vision, tool use, etc., and even due to factors such as fire caused by the gushing of high-pressure fluid, personnel cannot approach, which will prolong the cutting time. After cutting the coiled tubing, the coiled tubing below the fracture may fall into the well, increasing the difficulty of later salvage; the coiled tubing above the fracture flies upward, which has the risk of causing mechanical injury to personnel. The well shut-in time takes at least 8 minutes, the well shut-in time is long, the overflow volume is large, and the well control risk is high. The plug cannot pass through the coiled tubing square elevator to connect to the tubing coupling to shut in the well. The wellhead is out of control during this drilling process, and there is currently no supporting tool for shutting in the well for this work. Summary of the invention
[0004] The purpose of the present invention is to solve the problem in the prior art that the grab cock cannot pass through the coiled tubing elevator under the drilling condition, resulting in a large overflow during the process of lifting the coiled tubing, and to provide a well control device and a use method for assisting well shut-in in the coiled tubing salvage operation.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions:
[0006] The present invention provides a well control device for assisting well shut-in in a coiled tubing salvage operation, comprising a sealing joint;
[0007] An upper connecting joint is connected to one end of the sealing joint, a slip holder is connected to the other end of the sealing joint, and a down-well circulation joint is connected to the other end of the slip holder; an elastic slip is provided in the inner cavity of the slip holder; a circulation connection port is opened on the down-well circulation joint; a first limiting structure is installed on the end face of the upper connecting joint connected to the sealing joint, and a sealing structure is provided between the upper connecting joint and the sealing joint.
[0008] Preferably, a second limiting structure is installed on the end surface of the slip holder connected to the sealing joint.
[0009] Preferably, the elastic slip is located below the second limiting structure.
[0010] Preferably, the sealing structure is a rubber sealing ring.
[0011] Preferably, the sealing ring is located below the first limiting structure.
[0012] Preferably, the upper connecting joint and the sealing joint, and the sealing joint and the slip holder are connected via a double shoulder connecting buckle.
[0013] Preferably, a first tubing female buckle connected to the well-killing pipeline is provided at the other end of the upper connecting joint.
[0014] Preferably, a second tubing male buckle directly connected to the tubing coupling is provided at the other end of the well-pressure circulation joint.
[0015] Preferably, the inner diameters of the upper connecting joint, the sealing joint, the slip holder and the lower wellbore circulation joint are equal.
[0016] The present invention provides a method for using a well control device for assisting well shut-in in a coiled tubing fishing operation, comprising the following steps:
[0017] Rotate the sealing joint clockwise to connect it to the slip holder, lower the workover rig hook, and clamp the coiled tubing through the elastic slips inside the slip holder;
[0018] Rotate the upper connecting joint clockwise to squeeze the coiled tubing through the sealing structure under the first limiting structure to achieve sealing;
[0019] When killing the well, connect the circulation connection port to the throttling manifold or to the pump truck unit to carry out the well killing operation; when pulling up the coiled tubing, first rotate the upper connection joint counterclockwise and then rotate the sealing joint counterclockwise, and directly lift it up to resume the drilling condition.
[0020] Compared with the prior art, the present invention has the following beneficial effects:
[0021] The present invention proposes a well control device for assisting well shut-in in a continuous tubing salvage operation. The upper connecting joint is connected to the sealing joint at the lower step. The upper connecting joint is rotated clockwise to tighten the buckle and rotated counterclockwise to loosen the buckle. When the upper connecting joint body is rotated clockwise, the first limit structure moves downward and presses down on the sealing structure, so that the sealing structure is deformed, and the sealing structure is squeezed onto the internal continuous tubing body to achieve sealing. The sealing joint is connected to a slip holder. When the sealing joint body is rotated clockwise, the sealing joint presses down the elastic slip to provide downward pressure for the elastic slip. At the same time, the sealing joint and the slip holder are tightened to achieve sealing between the sealing joint and the slip holder. The slip holder is connected to a well pressure circulation joint. The internal elastic slip is the main functional device for fixing the continuous tubing before shutting in the well. When subjected to downward pressure, the inclined surface in the slip holder causes the elastic slip to deform inward, and the one-way slip teeth on the inner surface of the elastic slip contact the continuous tubing body. The support force of the slip teeth on the continuous tubing body suspends the continuous tubing on the slip holder. The circulation connection port on the well-killing circulation joint is used to connect the circulation pipeline to provide a circulation channel for the well-killing work after the well is shut in. Therefore, the well-killing device proposed by the present invention can rush to connect the plug through the coiled tubing elevator under the drilling condition, reduce the overflow volume by shortening the well-killing time, and improve the safety of well control.
[0022] The present invention proposes a method for using a well control device for assisting well shut-in in a coiled tubing salvage operation. In the well shut-in step, it is no longer necessary to cut the coiled tubing, thus avoiding personnel operating under pressure at the wellhead, making well shut-in easier and improving personnel's operating safety. It also makes up for the defect of using a workover rig to start the coiled tubing in the tubing and the lack of professional tools in case of overflow. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.
[0024] Figure 1 The present invention is a structural diagram of a well control device for assisting well shut-in in a coiled tubing salvage operation.
[0025] Figure 2 The present invention is a flow chart of a method for using a well control device for assisting well shut-in in a coiled tubing fishing operation.
[0026] Among them: 1-upper connecting joint, 2-sealing joint, 3-slip holder, 4-lower well pressure circulation joint, 5-elastic slip, 6-circulation connection port, 7-first limiting structure, 8-second limiting structure, 9-sealing structure, 10-double shoulder connecting buckle, 11-first oil pipe female buckle, 12-second oil pipe male buckle. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0028] 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 invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0030] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0031] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0032] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0033] The present invention is further described in detail below in conjunction with the accompanying drawings:
[0034] See also Figure 1 The present invention proposes a well control device for assisting well shut-in in a coiled tubing salvage operation, comprising a sealing joint 2; an upper connecting joint 1 is connected to one end of the sealing joint 2, a slip holder 3 is connected to the other end of the sealing joint 2, and a well-pressure circulation joint 4 is connected to the other end of the slip holder 3; an elastic slip 5 is provided in the inner cavity of the slip holder 3; a circulation connection port 6 is opened on the well-pressure circulation joint 4; a first limiting structure 7 is installed on the end face of the upper connecting joint 1 connected to the sealing joint 2, and a sealing structure 9 is provided between the upper connecting joint 1 and the sealing joint 2.
[0035] Preferably, a second limiting structure 8 is installed on the end face of the slip holder 3 connected to the sealing joint 2. The elastic slip 5 inside the slip holder 3 is the main functional device for fixing the coiled tubing before shutting in the well. When subjected to the downward pressure of the second limiting structure 8, the inclined surface inside the slip holder 3 causes the elastic slip 5 to deform inward, and the one-way slip teeth on the inner surface of the elastic slip 5 contact the coiled tubing body. The supporting force of the slip teeth on the coiled tubing body suspends the coiled tubing on the slip holder 3.
[0036] The elastic slip 5 is located below the second limiting structure 7 so that the second limiting structure 7 can exert greater pressure on the elastic slip 5 .
[0037] The sealing structure 9 is a rubber sealing ring, which is located below the first limiting structure 7, so as to press the first limiting structure 7 down onto the rubber sealing ring, deform the sealing ring, and squeeze the sealing ring onto the internal continuous oil pipe body to achieve sealing.
[0038] The upper connection joint 1 and the sealing joint 2, as well as the sealing joint 2 and the slip holder 3 are connected by a double shoulder connection buckle 10. A first tubing female buckle 11 connected to the well-killing pipeline is provided at the other end of the upper connection joint 1. A second tubing male buckle 12 directly connected to the tubing coupling is provided at the other end of the lower well-killing circulation joint 4.
[0039] The inner diameters of the upper connecting joint 1, the sealing joint 2, the slip holder 3 and the lower well-pressure circulation joint 4 are equal and coaxial, so as to be able to install the continuous casing and reduce the resistance when the continuous casing is lowered.
[0040] The working principle of a well control device for assisting well shut-in in a coiled tubing fishing operation proposed by the present invention is as follows:
[0041] The upper part of the upper connecting joint 1 is the first oil pipe female buckle 11, which is used to connect with the well-killing pipeline when well-killing is needed. The lower part of the upper connecting joint 2 is connected to the sealing joint 2 by a double shoulder connecting buckle 10. The buckle is tightened by rotating clockwise and loosened by rotating counterclockwise. When the upper connecting joint body is rotated clockwise, the first limiting structure 7 moves downward and presses down on the rubber sealing ring, causing the sealing ring to deform. The sealing ring is squeezed onto the internal continuous oil pipe body to achieve sealing. At the same time, the double shoulder connecting buckle 10 is tightened to achieve sealing between the upper connecting joint 1 and the sealing joint 2.
[0042] The sealing joint 2 is connected to the cava holder 3, which can be tightened by rotating clockwise and loosened by rotating counterclockwise. When the sealing joint 2 body is rotated clockwise, the second limiting structure 8 at the lower part of the sealing joint 2 presses down the elastic cava 5 to provide downward pressure for the elastic cava 5, and at the same time, the double shoulder connecting buckle 10 between the sealing joint 2 and the cava holder 3 is tightened to achieve sealing.
[0043] The slip holder 3 is connected to the next step well pressure circulation joint 4. The elastic slip 5 inside is the main functional device for fixing the coiled tubing before shutting in the well. When subjected to the downward pressure operation force of the second limiting structure 8, the inclined surface inside the slip holder 3 causes the elastic slip 5 to deform inward, and the one-way slip teeth on the inner surface of the elastic slip 5 contact the coiled tubing body. The supporting force of the slip teeth on the coiled tubing body suspends the coiled tubing on the slip holder 3.
[0044] The second tubing male buckle 12 is directly connected to the tubing coupling, and the circulation connection port 6 is used to connect the circulation pipeline to provide a circulation channel for the well killing work after the well is shut in.
[0045] The present invention provides a method for using a well control device for assisting well shut-in in a coiled tubing salvage operation, such as Figure 2 As shown, the following steps are included:
[0046] Step 1, rotate the sealing joint 2 clockwise to connect it with the slip holder 3, lower the workover rig hook, and clamp the coiled tubing through the elastic slips 5 inside the slip holder 3;
[0047] Step 2, rotate the upper connecting joint 1 clockwise to squeeze the coiled tubing through the lower sealing structure of the first limiting structure 7 to achieve sealing;
[0048] Step 3: When killing the well, connect the circulation connection port 6 to the throttling manifold or to the pump truck unit to perform the well killing operation;
[0049] Step 4: When pulling up the coiled tubing, first rotate the upper connecting joint 1 counterclockwise and then rotate the sealing joint 2 counterclockwise, and then directly lift it up to resume the drilling condition.
[0050] When in use, the coiled tubing is passed through the tool of the invention. If overflow occurs during the process of pulling up the coiled tubing, the detailed operation steps for shutting in the well are as follows:
[0051] A. Use a pipe clamp to rotate the sealing joint clockwise, lower the workover rig hook, and the coiled tubing is clamped by the elastic slips and under the action of its own gravity, the weight is borne on the device of the invention. This step takes 1 minute;
[0052] B. Use the pipe clamp to rotate the upper connection joint clockwise. The first limit structure of the upper connection joint presses down the rubber sealing ring to squeeze the coiled tubing body to achieve sealing. This step takes 1 minute. At this step, the well is shut in.
[0053] C. If well killing is required, the circulation connection port can be connected to the throttling manifold or to the pump truck unit to implement well killing operations according to the well killing method requirements.
[0054] D. When the coiled tubing needs to be pulled up, first rotate the upper connecting joint counterclockwise for one circle, then rotate the sealing joint counterclockwise for one circle, and then directly lift it up to resume the drilling condition.
[0055] according to Figure 1 The manufactured device, in the workshop test, after the tool stuck the coiled tubing, it pulled 20 tons and held it steady for 30 minutes, repeated 3 times, the tool was not damaged, and the elastic slips did not undergo plastic deformation. The parts were rotated repeatedly 1,100 times, the tool was flexible, and the elastic slips were not damaged. Field experiments were carried out in the Tarim X well operation. During the field use, this tool was used to pull out 2820m of coiled tubing (suspended 282 times, and an elastic slip was replaced every 100 times). During the process of pulling the coiled tubing, overflow occurred twice, and the well was shut down within 4 minutes. This tool was used to achieve the purpose of quickly shutting down the well when overflow occurred during the operation of the workover rig to salvage the coiled tubing.
[0056] The well control device for assisting well shut-in in the coiled tubing salvage operation proposed by the present invention has the following advantages: shortening the well shut-in time, reducing the overflow volume, and improving the well control safety; it is no longer necessary to cut the coiled tubing during the well shut-in procedure, thus avoiding personnel operating under pressure at the wellhead, making well shut-in easier and improving the operating safety of personnel; it makes up for the defect of using a workover rig to raise the coiled tubing in the tubing and having no professional tools in case of overflow; and it improves the speed of raising the coiled tubing.
[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A well control device for assisting well shut-in in coiled tubing salvage operations. It is characterized in that comprising a sealing joint (2); An upper connection joint (1) is connected to one end of the sealing joint (2), a slip holder (3) is connected to the other end of the sealing joint (2), and a well-pressure circulation joint (4) is connected to the other end of the slip holder (3); an elastic slip (5) is provided in the inner cavity of the slip holder (3); a circulation connection port (6) is provided on the well-pressure circulation joint (4); a first limiting structure (7) is installed on the end surface of the upper connection joint (1) connected to the sealing joint (2), and a sealing structure (9) is provided between the upper connection joint (1) and the sealing joint (2).
2. The well control device for assisting well shut-in in coiled tubing salvage operation according to claim 1, It is characterized in that A second limiting structure (8) is installed on the end surface of the slip holder (3) connected to the sealing joint (2).
3. The well control device for assisting well shut-in in coiled tubing salvage operation according to claim 2, It is characterized in that The elastic slip (5) is located below the second limiting structure (7).
4. The well control device for assisting well shut-in in coiled tubing salvage operation according to claim 1, It is characterized in that The sealing structure (9) is a rubber sealing ring.
5. The well control device for assisting well shut-in in coiled tubing salvage operation according to claim 4, It is characterized in that The sealing ring (9) is located below the first limiting structure (7).
6. The well control device for assisting well shut-in in coiled tubing salvage operation according to claim 1, It is characterized in that The upper connecting joint (1) and the sealing joint (2), as well as the sealing joint (2) and the slip holder (3) are all connected via a double shoulder connecting buckle (10).
7. The well control device for assisting well shut-in in coiled tubing salvage operation according to claim 1, It is characterized in that A first oil pipe female buckle (11) connected to the well-killing pipeline is provided at the other end of the upper connecting joint (1).
8. The well control device for assisting well shut-in in coiled tubing salvage operation according to claim 1, It is characterized in that A second oil pipe male buckle (12) directly connected to an oil pipe coupling is provided at the other end of the well-pressing circulation joint (4).
9. The well control device for assisting well shut-in in coiled tubing salvage operation according to claim 1, It is characterized in that The inner diameters of the upper connecting joint (1), the sealing joint (2), the slip holder (3) and the lower well-pressure circulation joint (4) are equal.
10. A method for using a well control device for assisting well shut-in in a coiled tubing salvage operation. It is characterized in that The steps include: The sealing joint (2) is rotated clockwise to connect with the slip holder (3), and the workover rig hook is lowered to clamp the coiled tubing through the elastic slips (5) inside the slip holder (3); The upper connecting joint (1) is rotated clockwise to squeeze the coiled tubing through the lower sealing structure of the first limiting structure (7) to achieve sealing; When killing the well, the circulation connection port (6) is connected to the throttling manifold or to the pump truck unit to perform the well killing operation; When pulling out the coiled tubing, first rotate the upper connecting joint (1) counterclockwise and then rotate the sealing joint (2) counterclockwise, and then directly lift it up to resume the drilling operation.