Horizontal well coiled tubing extending device and method for increasing penetrating length of coiled tubing
By designing a horizontal well continuous oil pipe extension device, and using hydraulic pressing device and three-point bending principle to straighten the oil pipe, the problem of insufficient extension capacity of the ultra-long horizontal well is solved, and the safe and efficient downward and deep extension of the continuous oil pipe is achieved.
Patent Information
- Application Number
- CN202510784140.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-12
- Publication Date
- 2025-07-25
AI Technical Summary
The prior art is difficult to extend the depth of the continuous oil pipe of an ultra-long horizontal well substantially without damaging the continuous oil pipe, and the extension capacity is limited, resulting in a large friction resistance and affecting the depth of the downward depth.
A horizontal well continuous oil pipe extension device is designed, including a support frame, a lower fixed wheel, an upper fixed wheel, a press wheel and a hydraulic pressing device. The press wheel is pushed to the press wheel tightly against the continuous oil pipe through the hydraulic pressing device. The oil pipe is straightened by the three-point bending principle, and the bending state is adjusted in combination with the press wheel position adjuster to achieve a significant increase in the bending radius and reduce friction.
Effectively increase the depth of the continuous oil pipe in the horizontal well, reduce friction resistance, and avoid oil pipe damage. It has simple operation, high safety, good economy, and significant extension effect.
Smart Images
Figure CN120367528A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of well repair, and more particularly to a horizontal well coiled tubing extension device and a method for increasing the running length of the coiled tubing. Background Art
[0002] With the increasing maturity of domestic shale gas exploration and development, in order to effectively increase the single well production and improve the development effect of oil and gas reservoirs, and reduce the cost of gas production, the horizontal section of horizontal wells is getting longer and longer. The horizontal section of shale gas wells has been extended from the previous 1500m to the current 2000~3000m and above. Continuous tubing can play a greater advantage in the process of handling ultra-long horizontal well operations due to its own advantages such as convenience, speed, and pressure operation. However, ultra-long horizontal wells have higher requirements for continuous tubing equipment and continuous tubing length, and the wellbore trajectory is becoming more and more complex. There are horizontal wells such as upturned and wavy sections, which makes the running of continuous tubing a great challenge. It is urgent to improve the continuous tubing extension technology to provide technical support for the running and extension of continuous tubing in long horizontal wells. Currently, the commonly used extension technologies include the use of hydraulic oscillators and pumped metal friction reducers, but the extension capacity is limited. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a horizontal well coiled tubing extension device and a method for increasing the running length of the coiled tubing, which can increase the bending radius of the coiled tubing and reduce the friction resistance of the coiled tubing when it runs through the horizontal well, thereby increasing the running depth of the horizontal well coiled tubing while meeting the requirements of not damaging the coiled tubing and significantly extending the running depth of the horizontal well coiled tubing.
[0004] The technical solution adopted by the present invention to solve its technical problem is: constructing a horizontal well continuous oil pipe extension device, including a support frame and a lower fixed wheel, an upper fixed wheel, a pressure wheel and a hydraulic clamping device installed inside the support frame, the support frame is provided with a channel for the continuous oil pipe to pass through, the lower fixed wheel and the upper fixed wheel are located on one side of the channel, the pressure wheel is located on the other side of the channel, the pressure wheel is fixed on a rotating arm, the upper end of the rotating arm is hinged on the support frame, the lower end of the rotating arm is connected to the hydraulic clamping device, one side of the continuous oil pipe is in contact with the lower fixed wheel and the upper fixed wheel, and the other side of the continuous oil pipe is pressed and straightened by the pressure wheel.
[0005] According to the above solution, the pressure wheel is connected to the resetting device.
[0006] According to the above solution, the reset device is a spring, one end of the spring is connected to the pressure wheel, and the other end is fixed to the support frame.
[0007] According to the above scheme, a pressure wheel position regulator is provided between the hydraulic clamping device and the pressure wheel, and the pressure wheel position regulator includes multiple groups of gaskets, and the straightening state of the coiled tubing is adjusted by adding or removing gaskets.
[0008] According to the above solution, the hydraulic pressing device is connected to the oil inlet pipeline and the oil return pipeline. By pressurizing, the pressing wheel is pushed to closely adhere to the coiled tubing. After the pressure is relieved, the pressing wheel returns to the initial position through the reset device.
[0009] According to the above solution, the upper end of the support frame is connected to the gooseneck pipe, and the lower end of the support frame is connected to the outer frame of the injector head. The present invention also provides a method for increasing the running length of coiled tubing in horizontal wells. Using the coiled tubing extension device for horizontal wells described above, the method includes the following steps: S1. For a well with self-locking in a horizontal well, calculate the length of the coiled tubing that needs to be straightened. S2. Raise the injector head to an upright state, and use a crane to cooperate in disassembling the gooseneck pipe of the injector head. S3. Use a crane to lift the coiled tubing extension device for horizontal wells. The support frame and the outer frame of the injector head are connected by a pin, and the gooseneck pipe is installed on the upper part of the support frame. S4. Pass the coiled tubing matching the coiled tubing extension device for horizontal wells through the space between the lower fixed wheel, the upper fixed wheel and the pressing wheel. S5. By pressurizing the hydraulic pressing device, push the pressing wheel to closely adhere to the coiled tubing, and straighten the coiled tubing through the lower fixed wheel, the upper fixed wheel and the pressing wheel. S6. After the coiled tubing is connected to downhole tools and enters the well, keep the hydraulic pressing device in a pressurized state. After the straightening reaches the calculated length, relieve the pressure of the hydraulic pressing device, and make the pressing wheel return to the initial position through the reset device.
[0010] Implementing the coiled tubing extension device for horizontal wells and the method for increasing the running length of coiled tubing of the present invention has the following beneficial effects: 1. When the coiled tubing is self-locked and cannot reach the target well depth only by the metal friction reducer and the hydraulic oscillator, install this coiled tubing extension device between the injector head and the gooseneck pipe. Utilize the three-point bending principle to weaken the residual deformation of the coiled tubing, and greatly reduce the friction between the coiled tubing in the horizontal section and the wellbore wall, so as to realize the extension of the coiled tubing in the horizontal well.
[0011] 2. The device of the present invention is used on the ground. Use a hand pump to pressurize, push the pressing wheel to closely adhere to the coiled tubing, and forcibly straighten the coiled tubing by mechanical force. Since the pressing wheel is connected to the coiled tubing and has a hardness less than that of the coiled tubing, it will not cause damage to the outer surface of the coiled tubing, and the straightened section is the low-life section of the coiled tubing, without losing the economy of the whole coil of coiled tubing.
[0012] 3. The present invention does not need to lower other tools, and can also be used in combination with a hydraulic oscillator and a metal friction reducer to further improve the coiled tubing extension effect. It has simple operation, strong extension ability and good safety.
[0013] 4. Compared with other extension measures of the present invention, the number of tools used is small, and the construction operation is concentrated on the ground. It does not damage the coiled tubing, does not damage the wellbore environment, does not affect other construction measures, has good safety, and has good economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings: Figure 1 is a schematic structural diagram of the coiled tubing extension device of the present invention; Figure 2 is a three-dimensional structural diagram of the coiled tubing extension device of the present invention; Figure 3 is a comparison diagram of the bending shape change of the front-end coiled tubing after straightening with the coiled tubing extension device of the present invention during traversing in the horizontal section. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] In order to have a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the drawings.
[0016] As Figures 1-3 shown, the horizontal well coiled tubing extension device of the present invention includes a support frame 2 and a lower fixed wheel 1, an upper fixed wheel 3, a pressing wheel 5, and a hydraulic pressing device 7 installed inside the support frame 2.
[0017] The support frame 2 is provided with a channel for the coiled tubing 4 to pass through. The lower fixed wheel 1 and the upper fixed wheel 3 are located on one side of the channel, and the pressing wheel 5 is located on the other side of the channel. The pressing wheel 5 is fixed on the rotating arm 9. The upper end of the rotating arm 9 is hinged to the support frame 2, and the lower end of the rotating arm 9 is connected to the hydraulic pressing device 7. One side of the coiled tubing 4 contacts the lower fixed wheel 1 and the upper fixed wheel 3, and the other side of the coiled tubing 4 is pressed and straightened by the pressing wheel 5.
[0018] Preferably, the pressing wheel 5 is connected to a reset device 6. In this embodiment, the reset device 6 is a spring. One end of the spring is connected to the pressing wheel 5, and the other end is fixed to the support frame 2. The hydraulic pressing device 7 is connected to the oil inlet pipeline and the oil return pipeline. By pressurizing, the pressing wheel 5 is pushed to closely adhere to the coiled tubing 4, and after pressure relief, the pressing wheel 5 is returned to the initial position through the reset device 6.
[0019] Preferably, a pressing wheel position adjuster 8 is provided between the hydraulic pressing device 7 and the pressing wheel 5. The pressing wheel position adjuster 8 includes multiple groups of gaskets, and the straightening state of the coiled tubing is adjusted by increasing or decreasing the gaskets.
[0020] Preferably, the upper end of the support frame 2 is connected to a gooseneck tube, and the lower end of the support frame 2 is connected to the outer frame of the injector head.
[0021] As Figure 3As shown, after straightening the front coiled tubing using the coiled tubing extension device of the present invention, the bending shape of the coiled tubing changes when the coiled tubing travels through the horizontal section. The bending radius of the coiled tubing increases significantly, greatly reducing the contact between the coiled tubing and the inner wall of the casing / tubing, thereby reducing the running friction of the coiled tubing and achieving the extension effect.
[0022] The present invention also provides a coiled tubing extension process method for horizontal wells, including the following steps: S1. For wells with self-locking in horizontal wells, calculate the length of the coiled tubing that needs to be straightened through theoretical calculation. For 2-inch coiled tubing, straightening 1000 m can theoretically extend about 300 m. S2. Raise the injector head to the upright state and use a crane to cooperate in disassembling the gooseneck tube of the injector head. S3. Use a crane to lift the coiled tubing extension device for horizontal wells. The support frame 2 is connected to the outer frame of the injector head through a pin, and the gooseneck tube is installed on the upper part of the support frame 2. S4. Pass the coiled tubing 4 matching the coiled tubing extension device for horizontal wells through the space between the lower fixed wheel 1, the upper fixed wheel 3 and the pressure wheel 5. S5. By pressurizing the hydraulic pressing device 7, push the pressure wheel 5 to closely adhere to the coiled tubing 4, and straighten the coiled tubing through the lower fixed wheel 1, the upper fixed wheel 3 and the pressure wheel 5. The straightening state of the coiled tubing can be adjusted by adding or reducing gaskets through the pressure wheel position adjuster 8. S6. After the coiled tubing is connected to downhole tools and runs into the well, keep the hydraulic pressing device 7 pressurized according to the theoretical calculation. After straightening reaches the calculated length, release the pressure of the hydraulic pressing device 7, and make the pressure wheel 5 return to the initial position through the reset device 6. S7. In addition to using the coiled tubing extension device for horizontal wells, a metal friction reducer and a hydraulic oscillator can also be used in cooperation to further extend the running length of the coiled tubing in horizontal wells.
[0023] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims. These all belong to the protection scope of the present invention.
Claims
1. A coiled tubing extension device for horizontal wells, characterized in that, It includes a support frame (2) and a lower fixed wheel (1), an upper fixed wheel (3), a pressing wheel (5) and a hydraulic pressing device (7) installed inside the support frame (2). A channel for the coiled tubing (4) to pass through is provided on the support frame (2). The lower fixed wheel (1) and the upper fixed wheel (3) are located on one side of the channel, and the pressing wheel (5) is located on the other side of the channel. The pressing wheel (5) is fixed on a rotating arm (9). The upper end of the rotating arm (9) is hinged to the support frame (2), and the lower end of the rotating arm (9) is connected to the hydraulic pressing device (7). One side of the coiled tubing (4) contacts the lower fixed wheel (1) and the upper fixed wheel (3), and the other side of the coiled tubing (4) is pressed and straightened by the pressing wheel (5).
2. The coiled tubing extension device for horizontal wells according to claim 1, wherein The pressing wheel (5) is connected to a reset device (6).
3. The coiled tubing extension device for horizontal wells according to claim 2, characterized in that, The reset device (6) is a spring. One end of the spring is connected to the pressing wheel (5), and the other end is fixed on the support frame (2).
4. The coiled tubing extension device for horizontal wells according to claim 1, characterized in that, A pressing wheel position adjuster (8) is provided between the hydraulic pressing device (7) and the pressing wheel (5). The pressing wheel position adjuster (8) includes multiple groups of gaskets, and the straightening state of the coiled tubing is adjusted by adding or removing gaskets.
5. The horizontal well coiled tubing extension device according to claim 2, wherein The hydraulic pressing device (7) is connected to the oil inlet pipeline and the oil return pipeline. By pressurizing, the pressing wheel (5) is pushed to closely adhere to the coiled tubing (4), and after the pressure is relieved, the pressing wheel (5) returns to the initial position through the reset device (6).
6. The horizontal well coiled tubing extension device according to claim 1, characterized in that The upper end of the support frame (2) is connected to a gooseneck tube, and the lower end of the support frame (2) is connected to the outer frame of the injector head.
7. A method for increasing the running length of coiled tubing in horizontal wells, which uses the coiled tubing extension device for horizontal wells described in any one of claims 1-6, characterized in that, It includes the following steps: S1. For the well with self-locking in the horizontal well, calculate the length of the coiled tubing that needs to be straightened. S2. Raise the injector head to the upright state, and use a crane to cooperate in disassembling the gooseneck tube of the injector head. S3. Use a crane to lift the horizontal well coiled tubing extension device. The support frame (2) is connected to the outer frame of the injector head through a pin, and the gooseneck tube is installed on the upper part of the support frame (2). S4. Pass the coiled tubing (4) matching the horizontal well coiled tubing extension device through the space between the lower fixed wheel (1), the upper fixed wheel (3) and the pressing wheel (5). S5. By pressurizing the hydraulic pressing device (7), the pressing wheel (5) is pushed to closely adhere to the coiled tubing (4), and the coiled tubing is straightened by the lower fixed wheel (1), the upper fixed wheel (3) and the pressing wheel (5). S6. After the coiled tubing is connected to the downhole tool and enters the well, keep the hydraulic pressing device (7) in the pressurized state. After the straightening reaches the calculated length, relieve the pressure of the hydraulic pressing device (7), and the pressing wheel (5) returns to the initial position through the reset device (6).