Coal mine goaf pitching self-fixing type sleeve and screen pipe combination
By designing a combination of ball-pitched self-solid casing screening pipes in the coal mine goaf, using balls and round holes of different diameters, combined with claw-type straighteners, the problem of cement leakage when the goaf or coal seam is covered with cracks, and the convenience and stability of cementing operations are achieved.
Patent Information
- Application Number
- CN202420404260.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-04
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-03-04
AI Technical Summary
When cracked zones or coal seams are covered with cracks, cement will leak, resulting in the inability to perform cementing operations.
A combination of ball-throwing self-solid casing screen pipes in coal mine goaf is designed, including casing body, connecting ring and screen pipe body. By setting balls and round holes of different diameters and combining claw-type straighteners, the cementing effect is achieved.
This device can easily and quickly realize cementing operations when the goaf or coal seam is covered with cracks, improving the stability and service life of the device.
Smart Images
Figure CN222558517U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of well cementing, in particular to a ball-throwing self-fixing casing and screen pipe combination in a coal mine goaf area. Background Art
[0002] Cement ring is a term used in the oil drilling industry for drilling engineering. Cement ring refers to the cement stone formed by cement slurry in the annular space. Its function is to wrap the casing hoop into a ring. After the cementing operation, the casing and the formation are bonded together by the cement ring (i.e. cement stone).
[0003] A Chinese patent with a publication number of , which has been searched, discloses a casing pre-set cement ring cementing auxiliary equipment, comprising a cement ring and a calibration block, wherein the outer wall of the cement ring is sleeved with an outer shell, a block is fixedly installed on the top of the outer shell, a pull ring is fixedly installed on the top of the block, a conversion interface is fixedly installed on the bottom of the cement ring, a metal injection head is fixedly installed on the bottom end of the conversion interface, and a discharge port is fixedly installed on the bottom end of the metal injection head. The casing pre-set cement ring cementing auxiliary equipment, by means of a universal wheel, places the calibration block at the oil port, pulls the handle piece, the spring will stretch, the calibration block moves, finds the oil well port, lowers the stabilizing nail into the ground, and inserts the cement ring into the inner wall of the calibration block, and then continues to lower it, so that the cement ring is evenly spaced from the left and right sides of the inner wall of the oil well, thereby achieving the effect of aligning with the oil port and not rubbing the oil well wall.
[0004] However, when the target stratum is a goaf or a fractured zone overlying a coal seam, cementing cannot be performed through a cement ring because there are too many cracks and cavities in the goaf or the fractured zone overlying a coal seam, and cement will be lost, resulting in failure of cementing operations. Utility Model Content
[0005] 1. Technical issues to be resolved
[0006] In view of the shortcomings of the prior art, the utility model provides a coal mine goaf area ball-casting self-fixing casing screen combination. Its advantage is that when the target layer is a goaf area or a fracture zone overlying a coal seam, cementing operations can also be conveniently and quickly achieved.
[0007] (II) Technical solution
[0008] To achieve the above purpose, the utility model provides the following technical solution: a coal mine goaf area ball-throwing self-fixing casing screen combination, comprising a casing body, a connecting ring fixedly connected to the bottom of the casing body, and a screen body fixedly connected to the bottom of the connecting ring.
[0009] Preferably, the screen tube body is provided with through holes, and 10 through holes are arranged per 100 square centimeters.
[0010] This setting can improve the stability of the device during use.
[0011] Preferably, a circular hole A is formed in the casing body, a circular hole B is formed on the connecting ring, and a circular hole C is formed on the screen tube body.
[0012] Preferably, the cross-sectional diameter of the circular hole A is larger than that of the circular hole B, and the cross-sectional diameter of the circular hole B is larger than that of the circular hole C.
[0013] This arrangement makes it easy to fix the device by throwing the ball.
[0014] Preferably, the thickness of the connecting ring is 10 centimeters, the length of the casing body is 3 meters, and the thickness of the screen tube body is 5 meters.
[0015] Such an arrangement can improve the rigidity of the device, thereby increasing the service life of the device.
[0016] Preferably, claw-type centralizers are connected inside the casing body, the connecting ring and the screen tube body.
[0017] This arrangement makes it easy to fix the device.
[0018] (III) Beneficial effects
[0019] Compared with the prior art, the utility model provides a coal mine goaf area ball-throwing self-fixing casing screen combination, which has the following beneficial effects:
[0020] 1. The coal mine goaf area ball-throwing self-fixing casing screen combination connects the casing body and the screen body through a connecting ring to form a casing screen combination, and then three balls C, B and A with different diameters are sequentially thrown into the casing screen combination, the diameter of ball C is larger than that of ball B, and the diameter of ball B is larger than that of ball A. Since the cross-sectional diameter of circular hole A is larger than that of circular hole B, and the cross-sectional diameter of circular hole B is larger than that of circular hole C, claw-type centralizers are connected to the casing body, the connecting ring and the screen body, so that after the ball is thrown, the claw-type centralizer will sequentially extend to the outside of the casing screen combination, thereby achieving a cementing effect. Therefore, when the target stratum is a goaf area or a fracture zone overlying a coal seam, cementing operations can also be conveniently and quickly achieved.
[0021] 2. The coal mine goaf area ball-throwing self-fixing casing screen combination has a through hole on the screen body, with a through hole per square centimeter, which can improve the stability of the device during use. The cross-sectional diameter of circular hole A is larger than that of circular hole B, and the cross-sectional diameter of circular hole B is larger than that of circular hole C, which makes it easy to fix the device by throwing balls. The thickness of the connecting ring is 10 cm, the length of the casing body is 3 meters, and the thickness of the screen body is 5 meters, which can improve the rigidity of the device and thus increase the service life of the device. Claw-type stabilizers are connected to the casing body, the connecting ring and the screen body, which makes it easy to fix the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0023] Figure 1 This is the front view of the utility model;
[0024] Figure 2 It is a top view of the utility model;
[0025] Figure 3 It is a cross-sectional view of the utility model.
[0026] In the figure: 1. casing body; 2. connecting ring; 3. screen tube body; 4. through hole; 5. circular hole A; 6. circular hole B; 7. circular hole C. DETAILED DESCRIPTION
[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0028] like Figure 1-3 As shown, the utility model provides a self-fixing casing screen combination for ball throwing in coal mine goaf, including a casing body 1, a connecting ring 2 is fixedly connected to the bottom of the casing body 1, and a screen body 3 is fixedly connected to the bottom of the connecting ring 2. By setting the thickness of the connecting ring 2 to 10 cm, the length of the casing body 1 to 3 meters, and the thickness of the screen body 3 to 5 meters, such a setting can improve the rigidity of the device, thereby improving the service life of the device, by setting a through hole 4 on the screen body 3, 10 through holes 4 are set for every 100 square centimeters, such a setting can improve the stability of the device during use, a circular hole A5 is opened in the casing body 1, by setting the cross-sectional diameter of the circular hole A5 to be larger than the circular hole B6, and the cross-sectional diameter of the circular hole B6 to be larger than the circular hole C7, such a setting is convenient for fixing the device by throwing a ball, a circular hole B6 is opened on the connecting ring 2, and a circular hole C7 is opened on the screen body 3, and a claw-type stabilizer is connected to the casing body 1, the connecting ring 2 and the screen body 3, so that the device is convenient for fixing.
[0029] In this embodiment, through holes 4 are provided on the screen tube body 3, and 10 through holes 4 are provided for every 100 square centimeters. Such an arrangement can improve the stability of the device during use. By setting the cross-sectional diameter of the circular hole A5 to be larger than that of the circular hole B6, and the cross-sectional diameter of the circular hole B6 to be larger than that of the circular hole C7, such an arrangement makes it easy to fix the device by throwing a ball. By setting the thickness of the connecting ring 2 to 10 centimeters, the length of the casing body 1 to 3 meters, and the thickness of the sieve tube body 3 to 5 meters, such an arrangement can improve the rigidity of the device, thereby improving the service life of the device. By setting the casing body 1, the connecting ring 2 and the sieve tube body 3 to be connected with a claw-type stabilizer, such an arrangement makes it easy to fix the device.
[0030] The working principle of the self-fixing casing and screen combination in the goaf of the coal mine will be described in detail below.
[0031] like Figure 1-3 As shown, when in use, the casing body 1 and the screen body 3 are connected by the connecting ring 2 to form a casing-screen combination, and then three balls C, B and A with different diameters are sequentially put into the casing-screen combination, the diameter of ball C is larger than that of ball B, and the diameter of ball B is larger than that of ball A. Since the cross-sectional diameter of circular hole A5 is larger than that of circular hole B6, and the cross-sectional diameter of circular hole B6 is larger than that of circular hole C7, claw-type centralizers are connected inside the casing body 1, the connecting ring 2 and the screen body 3, so that after the balls are put in, the claw-type centralizers will sequentially extend to the outside of the casing-screen combination, thereby achieving a cementing effect. Therefore, when the target stratum is a goaf or a fracture zone overlying a coal seam, cementing operations can also be conveniently and quickly achieved.
Claims
1. A self-fixing casing and screen assembly for coal mine goaf, comprising a casing body (1), characterized in that: The bottom of the casing body (1) is fixedly connected to a connecting ring (2), and the bottom of the connecting ring (2) is fixedly connected to a screen tube body (3).
2. The coal mine goaf area ball-throwing self-fixing casing and screen assembly according to claim 1 is characterized in that: The screen tube body (3) is provided with through holes (4), and 10 through holes (4) are arranged per 100 square centimeters.
3. The coal mine goaf area ball-throwing self-fixing casing and screen assembly according to claim 1 is characterized in that: A circular hole A (5) is provided in the casing body (1), a circular hole B (6) is provided on the connecting ring (2), and a circular hole C (7) is provided on the screen tube body (3).
4. The coal mine goaf area ball-throwing self-fixing casing and screen assembly according to claim 3 is characterized in that: The cross-sectional diameter of the circular hole A (5) is larger than that of the circular hole B (6), and the cross-sectional diameter of the circular hole B (6) is larger than that of the circular hole C (7).
5. The coal mine goaf area ball-throwing self-fixing casing and screen assembly according to claim 1 is characterized in that: The thickness of the connecting ring (2) is 10 centimeters, the length of the casing body (1) is 3 meters, and the thickness of the screen tube body (3) is 5 meters.
6. The coal mine goaf area ball-throwing self-fixing casing and screen assembly according to claim 1 is characterized in that: The casing body (1), the connecting ring (2) and the screen tube body (3) are internally connected with a claw-type centralizer.