Sliding block type fishing socket for coiled tubing
By designing a slider salvage barrel for continuous oil pipes, using the guide channel and slide structure, the problem of fracture caused by internal stress during salvage of long continuous oil pipes is solved, and efficient and stable salvage effect is achieved, meeting the needs of oil field production.
Patent Information
- Application Number
- CN202421788938.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-07-26
AI Technical Summary
When existing salvage tools salvage long continuous oil pipes, they are prone to breaking the pipe body due to internal stress, and the salvage cycle is long, low efficiency, high labor intensity and high cost, which cannot meet the production needs of modern oil fields.
A slider-type salvage barrel for continuous oil pipe is designed, using an upper joint, guide shoe, guide sleeve and slide structure, and guide continuous oil pipe is guided into the drilling tool drill rod through the guide channel. The split slide and independent spring structure in radial position are used to achieve stable grabbing and overall salvage of the continuous oil pipe.
One-time overall salvage of long continuous oil pipes is achieved, which avoids pipe body breakage, shortens salvage cycle, improves salvage efficiency, reduces operating strength and cost, and meets the needs of oil field production.
Smart Images
Figure CN222810780U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of oilfield fishing tools, in particular to a slider type fishing tube for a continuous oil pipe. Background Art
[0002] Coiled Tubing is a flexible tubing made of low-carbon alloy steel, also known as flexible tubing. It can be used to replace conventional tubing in many production operations in the field of oil field drilling and production. It has the advantages of small storage space, short operation cycle, low cost, easy storage and transportation, etc. More importantly, the use of coiled tubing can maintain pressure operation and achieve overall continuous operation, which can not only ensure better production operation results, but also maintain high production operation efficiency. At present, it has been widely promoted and applied in production links such as oil field drilling, completion, fracturing, acidizing, drainage, oil testing, oil and gas production, well repair and gathering pipeline unblocking. During production and use, once the coiled tubing suffers fatigue fracture or is subjected to impact and corrosion damage, it needs to be replaced in time. In addition, the operation first requires the coiled tubing to be salvaged out of the well. The existing salvage tools all adopt the salvage method of grabbing the fish head for lifting. Since the downhole coiled tubing is generally a long continuous pipe body, sometimes even up to several thousand meters, the self-gravity of the coiled tubing or the tension of the drill pipe of the drilling tool often causes the coiled tubing itself to produce large internal stress when grabbing the fish head for salvage. During the salvage operation, the effect of its internal stress can easily cause the coiled tubing to accidentally break at the pipe body defect near the wellhead end of the oil well, and the long length of the coiled tubing cannot be directly salvaged out of the well as a whole. The salvage operation usually requires repeated salvage operations of lifting and sending salvage tools to grab the coiled tubing fish head. Not only does it have the problems of long operation cycle and low production efficiency, but it also has the disadvantages of high labor intensity and high cost consumption, which cannot meet the modern production requirements of oil fields. Therefore, it is necessary to research and develop special salvage tools for coiled tubing based on the structural characteristics of coiled tubing and its application environment characteristics to solve existing technical problems. Utility Model Content
[0003] The utility model aims to provide a slider type overshot tube for a coiled tubing, improve the fishing process of the coiled tubing, shorten the fishing cycle, improve the fishing efficiency, reduce the operation intensity, save the production cost and meet the production needs of the oil field.
[0004] A slider-type overshot tube for a continuous oil pipe comprises: an upper joint, a guide shoe, a guide sleeve and a slider; the upper joint and the guide shoe are connected up and down to form a main body of the overshot tube structure; a connecting mechanism for connecting a drilling tool drill pipe is provided at the upper end of the upper joint, a containing space is provided at the lower part of the upper joint, and the guide sleeve is fixedly installed in the containing space; the interior of the main body of the overshot tube structure has a guide channel running through the upper and lower ends, and the guide channel can guide the downhole continuous oil pipe to smoothly enter and enter the central water hole of the drilling tool drill pipe through the guide channel; the inner side of the guide sleeve is an inverted conical inner conical surface, and a guide groove arranged along the generatrix direction is provided on the inverted conical inner conical surface, and the The guide grooves are evenly arranged on the circumferential section of the guide sleeve, the slider is a wedge-shaped block, the front side of which is an arc-shaped cylindrical surface, and the rear side is provided with an inlay wedge, the inlay wedge corresponds to the guide groove structure opened on the guide sleeve and is cooperatively inlaid in the guide groove, and the slider is radially limited and connected to the guide sleeve by the inlay cooperation of the inlay wedge and the guide groove, and the slider can be guided by the guide groove to move linearly along the generatrix direction of the inverted cone inner cone surface, and the radial limitation and axial guidance of the slider can effectively prevent the slider from blocking or hindering the connectivity of the guide channel inside the main body of the overshot tube structure, thereby ensuring that the continuous oil pipe can always pass smoothly.
[0005] The slider-type overshot tube for continuous oil tubing also includes: a spring; the spring is an independent spring respectively arranged in correspondence with each of the sliders, and is respectively limited and supported between the cylinder body and each of the sliders, and applies an elastic force to each of the sliders relative to the cylinder body, so as to push the slider to fully descend along the guide sleeve, thereby maintaining the stability of the initial structural state of the slider-type overshot tube for continuous oil tubing and improving the reliability of the continuous oil tubing salvage function.
[0006] The slider-type overshot tube for continuous oil tubing is preferably provided with a spring seat fixedly installed in the accommodating space on the upper joint, and the spring seat is an annular body, which is arranged on the upper part of the guide sleeve, and the inner ring aperture can ensure the patency of the guide channel inside the overshot tube structure main body. The lower annular end surface is provided with a spring upper positioning groove corresponding to the position of the slider, and at the same time, a spring lower positioning groove corresponding to the spring upper positioning groove is provided on the upper end surface of each slider, and the two ends of the spring are respectively correspondingly embedded in the spring upper positioning groove and the spring lower positioning groove. Through the structural cooperation between the spring seat and the slider, the spring is limited and positioned, thereby improving the stability and reliability of the spring in elastically supporting the slider. At the same time, the spring can also be isolated and protected to prevent the elastic deformation of the spring from possibly obstructing or blocking the guide channel inside the overshot tube structure main body, thereby further ensuring the patency of the communication of the guide channel.
[0007] In the slider-type salvage barrel for continuous oil tubing, the guide groove opened on the guide sleeve is preferably a dovetail groove, and the embedded wedge arranged on the slider is a dovetail wedge corresponding to the dovetail groove structure. The stability and reliability of the coordination of the dovetail wedge groove structure formed by the correspondence between the dovetail wedge and the dovetail groove is ensured, and the smoothness of the movement of the slider along the generatrix direction of the inverted cone inner cone surface on the guide sleeve is ensured on the basis of achieving radial limitation of the slider.
[0008] The slider-type salvage barrel for a continuous oil pipe is preferably provided with four sliders installed on the guide sleeve, and the sliders are evenly arranged on the cross-sectional circumference of the guide sleeve. At the same time, corresponding to the number of the sliders, four springs are correspondingly arranged between the spring seat and the slider.
[0009] In the slider-type overshot tube for a coiled tubing, the curvature radius of the arc-shaped cylindrical surface on the front side of the slider is preferably the same as the curvature radius of the target coiled tubing to be salvaged. When the slider cooperates with the hoop to clamp the coiled tubing, the slider can form a surface contact with the coiled tubing, so that the friction force generated between the slider and the coiled tubing is maximized, the clamping strength of the slider on the coiled tubing is increased, and the salvage effect of the coiled tubing is improved and guaranteed.
[0010] The slider-type overshot tube for the coiled tubing preferably has saw-shaped teeth on the front arc-shaped cylindrical surface of the slider to increase the friction between the slider and the coiled tubing, further increase the clamping strength of the slider on the coiled tubing, and ensure that the clamping state is stable and reliable.
[0011] The beneficial effect of the utility model is to provide a slider type overshot tube for a continuous oil pipe. Aiming at the characteristics of the continuous oil pipe with low strength, long length and no joints, a continuous and normal guide channel is arranged inside the overshot tube structure body formed by connecting the upper joint and the guide shoe, so that the downhole continuous oil pipe can be guided into the overshot tube structure body during the salvage process and further guided upward into the central water hole of the drill pipe of the drilling tool, thereby changing the traditional salvage process method of grabbing the fish head, and the continuous oil pipe is grabbed under the force at the lower part of the continuous oil pipe far away from the wellhead, which can completely avoid the accidental breakage of the continuous oil pipe near the wellhead end of the oil well, and realize the one-time overall salvage of the downhole continuous oil pipe, wherein the use of a radially limited split slider and a further independent spring setting structure can ensure that the continuous oil pipe has sufficient grasping strength and the salvage effect without hindering or blocking the internal guide channel of the overshot tube structure body; the application in actual production can shorten the salvage cycle, improve the salvage efficiency, reduce the operation intensity, save production costs, solve the existing technical problems, and meet the production needs of oil fields. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is the basic structure diagram of the slider type overshot tube for continuous tubing.
[0013] Figure 2 for Figure 1 Sectional view of the AA section.
[0014] Figure 3 This is a structural diagram of the salvage status of a slider-type overshot tube for a coiled tubing.
[0015] Among them: 1 is the upper joint, 3 is the guide shoe, 4 is the guide sleeve, 5 is the slider, 6 is the spring, 7 is the spring seat, 8 is the embedded wedge, 9 is the guide groove, and 10 is the continuous oil pipe. DETAILED DESCRIPTION
[0016] Furthermore, the technical solution claimed for protection of the utility model is described in detail in conjunction with specific embodiments and their drawings.
[0017] A slider type overshot for a coiled tubing, such as Figures 1 to 3 As shown, it is composed of an upper joint 1, a guide shoe 3, a guide sleeve 4, a slider 5, a spring 6 and a spring seat 7; the upper joint 1 is connected with the guide shoe 3 to form a salvage tube structure body, and a double-stage connecting internal thread is provided at the upper end. The interior of the salvage tube structure body has an axially penetrating guide channel, and an accommodating space is provided at the lower part of the upper joint 1. The spring seat 7 and the guide sleeve 4 are correspondingly arranged and fixedly installed in the accommodating space in the upper and lower parts. The inner side surface of the guide sleeve 4 is an inverted conical inner conical surface, and 4 guide grooves 9 opened along the generatrix direction are provided on the inverted conical inner conical surface. The guide grooves 9 are dovetail grooves and are evenly arranged on the circumferential section of the guide sleeve 4. The slider 5 is a wedge-shaped block, and the front side surface is an arc-shaped cylinder with saw-shaped teeth. The curvature radius of the arc-shaped cylinder is the same as that of the matching salvage The circumferential curvature radius of the coiled tubing 10 is the same, and the rear side is an inlaid wedge 8 of a dovetail structure, i.e., a dovetail wedge. The inlaid wedge 8 is cooperatively inlaid in the guide groove 9, and the sliders 5 are respectively radially limited and connected to the guide sleeves 4. Four spring upper positioning grooves evenly distributed along the circumference are opened on the lower annular end face of the spring seat 7, and the opening positions of the spring upper positioning grooves correspond to the setting positions of the sliders 5 respectively. At the same time, spring lower positioning grooves corresponding to the spring upper positioning grooves are opened on the upper end face of each of the sliders 5. The two ends of the spring 6 are respectively correspondingly inlaid in the spring upper positioning groove and the spring lower positioning groove, and are elastically supported between the spring seat 7 and the slider 5, and elastic forces are applied to each of the sliders 5 relative to the upper joint 1.
[0018] When using the slider-type overshot tube for coiled tubing described in this embodiment to salvage the downhole coiled tubing, the overshot tube is connected to the drill pipe of the drilling tool and sent down the well. During the sending process, the drill pipe of the drilling tool is rotated to guide the coiled tubing 10 into the guide shoe 3, and the drill pipe of the drilling tool is continuously sent down to further guide the coiled tubing 10 into the guide channel of the overshot tube structure body. Since the aperture of the circular profile formed by the front end surfaces of the four sliders 5 is smaller than the diameter of the coiled tubing 10, when the coiled tubing 10 enters the accommodating space of the upper joint 1, the upper end of the coiled tubing 10 will push the slider 5 upwards, so that the coiled tubing 10 The slider 5 overcomes the elastic force of the spring 6, and is guided by the guide groove 9 opened on the guide sleeve 4 to move linearly along the generatrix direction of the inner inverted conical surface of the guide sleeve 4. At the same time, as the slider 5 moves upward, the aperture of the circumferential contour formed by the front end surface of the slider 5 gradually expands. When the aperture of the circumferential contour is correspondingly expanded to the diameter size of the coiled tubing 10, the coiled tubing 10 can enter the circumferential contour and thereafter be guided through the guide channel in the main body of the overshot tube structure without obstacles, enter and be continuously introduced into the central water hole of the drill pipe of the drilling tool, until the continuous oil pipe 10 is The tubular slider overshot tube is sent down to the salvage grabbing area at the lower part of the coiled tubing 10 away from the wellhead. At this time, the drilling tool drill pipe is lifted upward, and the sliding block 5 moves downward relative to the guide sleeve 4 due to the friction resistance of the sliding block 5 relative to the coiled tubing 10. The shrinkage in the aperture of the circumferential profile formed by the front end surface combination of the sliding block 5 is small, and the sliding block 5 clamps the matching hoop sleeve on the coiled tubing 10. The drilling tool drill pipe is continuously lifted upward, and the coiled tubing 10 that has been introduced into the drilling tool drill pipe can be salvaged as a whole at one time. In the above salvage process, since the salvage force bearing point is at the lower part of the salvage target coiled tubing 10, The end area of the coiled tubing 10 above the load-bearing point will not be affected by the gravity of the coiled tubing 10 and the tension of the drill rod of the drilling tool. Therefore, no matter what defects and flaws exist on the coiled tubing 10 in this area, it will not be accidentally broken by the own gravity of the coiled tubing 10 or the tension of the drill rod of the drilling tool, which can effectively achieve the purpose of the utility model and has sufficient reliability in salvage application. At the same time, the slider-type overshot tube for the coiled tubing also has the characteristics of strong pertinence, simple structure, low cost, easy operation, stable function, etc., and has broad promotion and application prospects in oil field production.
Claims
1. A slider-type overshot for coiled tubing, characterized in that: include: An upper joint (1), a cylinder (2), a guide shoe (3), a guide sleeve (4) and a slider (5); the upper joint (1), the cylinder (2) and the guide shoe (3) are sequentially connected up and down to form a salvage tube structure body; a connecting mechanism is provided at the upper end of the upper joint (1); a receiving space is provided at the lower part of the upper joint (1); the guide sleeve (4) is fixedly installed in the receiving space; the interior of the salvage tube structure body has a guide channel passing through the upper and lower ends; the inner side of the guide sleeve (4) is an inverted conical inner conical surface, and a groove is provided along the inverted conical inner conical surface. A guide groove (9) is arranged in the direction of the generatrix, the guide groove (9) being evenly arranged on the circumferential section of the guide sleeve (4), and an inlay wedge (8) is arranged on the rear side, the inlay wedge (8) and the guide groove (9) provided on the guide sleeve (4) correspond to each other in structure and are cooperatively inlaid in the guide groove (9), and the sliding block (5) is radially limitedly connected to the guide sleeve (4) by means of the inlay cooperation between the inlay wedge (8) and the guide groove (9), and the sliding block (5) is kept to be guided by the guide groove (9) to move linearly along the generatrix direction of the inverted conical inner conical surface.
2. A slider-type overshot for coiled tubing as claimed in claim 1, characterized in that: Also includes: Spring (6); the spring (6) is an independent spring respectively arranged in correspondence with each of the sliders (5), and is respectively supported between the cylinder (2) and each of the sliders (5) to apply an elastic force to each of the sliders (5) relative to the cylinder (2), thereby pushing the sliders (5) to fully descend along the guide sleeve (4).
3. A slider-type overshot for coiled tubing as claimed in claim 2, characterized in that: A spring seat (7) is fixedly installed in the accommodating space on the upper joint (1). The spring seat (7) is an annular body and is arranged on the upper part of the guide sleeve (4). The inner ring aperture can ensure the patency of the guide channel inside the main body of the overshot tube structure. The lower annular end surface is provided with spring upper positioning grooves corresponding to the positions of the sliders (5). At the same time, the upper end surface of each slider (5) is provided with spring lower positioning grooves corresponding to the spring upper positioning grooves. The two ends of the spring (6) are respectively correspondingly embedded in the spring upper positioning groove and the spring lower positioning groove.
4. A slider-type overshot for coiled tubing as claimed in claim 3, characterized in that: The guide groove (9) formed on the guide sleeve (4) is a dovetail groove, and the inlay wedge (8) provided on the slider (5) is a dovetail wedge corresponding to the dovetail groove structure.
5. A slider-type overshot for coiled tubing as claimed in claim 4, characterized in that: Four sliders (5) are mounted on the guide sleeve (4). The sliders (5) are evenly arranged on the cross-sectional circumference of the guide sleeve (4). Meanwhile, corresponding to the number of sliders (5), four springs (6) are correspondingly arranged between the spring seat (7) and the sliders (5).
6. A slider-type overshot for coiled tubing as claimed in claim 5, characterized in that: The curvature radius of the arc-shaped cylindrical surface on the front side of the sliding block (5) is the same as the curvature radius of the salvage target coiled tubing (10).
7. A slider-type overshot for coiled tubing as claimed in claim 6, characterized in that: Saw-shaped teeth are provided on the front arc-shaped cylindrical surface of the slider (5).