A rotary head for loading and pressurizing in shallow coalbed methane wells

Abstract

This utility model relates to a loading rotary head, specifically a loading and pressurizing rotary head for shallow coalbed methane wells. It includes a hydraulic pressure head and a fixed base. A support plate is rotatably mounted on the top of the fixed base, and the pressure head of the hydraulic pressure head abuts against the top of the support plate. A tubing string connector is located at the bottom of the fixed base, and the cross-section of the tubing string connector is an inverted trapezoid. An external thread adapted to the internal thread of the tubing string is provided on the outer wall of the tubing string connector. This utility model can simultaneously meet the pressure-driven rotation requirements of well workover operations in shallow coalbed methane wells, such as thread making and cement plug drilling, reducing manual labor intensity while improving work efficiency.

Description

Technical Field

[0001] This utility model relates to a loading rotary head, specifically a loading and pressurizing rotary head for shallow coalbed methane wells. Background Technology

[0002] In the production and maintenance of coalbed methane wells, wellbore deformation and twisting in shallow sections leading to tubing string blockage is a common and complex problem.

[0003] When a shallow section of the tubing string gets stuck, a workover rig is usually used to lift the tubing string to free it. However, if lifting with the workover rig is ineffective, drilling pressure needs to be applied downwards to free it. In this case, the tubing string is light and the drilling pressure is low, which makes it impossible to achieve the desired result. Utility Model Content

[0004] The purpose of this invention is to solve the technical problem that when using a workover rig to lift the stuck material in the current shallow well unblocking process is ineffective, applying drilling pressure downwards to unblock the stuck material is also ineffective. Therefore, this invention provides a rotary head for loading and pressurizing coalbed methane shallow wells.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A rotary head for loading and pressurizing in shallow coalbed methane wells includes a hydraulic pressure head and a fixed base;

[0007] A load-bearing plate is rotatably mounted on the top of the fixed base, and the pressure head of the hydraulic pressure head abuts against the top of the load-bearing plate.

[0008] The bottom of the fixing base is provided with an oil pipe column connector, the cross-section of which is an inverted trapezoid; the outer wall of the oil pipe column connector is provided with an external thread that matches the internal thread of the oil pipe column.

[0009] Furthermore, the top of the fixed base is provided with a mounting groove, and a thrust bearing is provided in the mounting groove;

[0010] The upper and lower washers of the thrust bearing are connected to the bearing plate and the mounting groove, respectively.

[0011] Furthermore, the bottom of the load-bearing plate is provided with a load-bearing plate flange;

[0012] The top of the fixing seat is provided with a fixing seat flange;

[0013] The fixing seat flange extends into the interior of the bearing plate flange, and there is a gap between the outer wall of the fixing seat flange and the inner wall of the bearing plate flange.

[0014] Furthermore, the tubing string connector is a hollow tube.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] The rotary head for loading and pressurizing coalbed methane shallow wells provided by this utility model replaces the traditional drilling pressure loading method by setting up a bearing plate and a thrust bearing and using the hydraulic cylinder of an excavator to apply axial pressure to the bearing plate. The thrust generated by the hydraulic cylinder of the excavator first acts on the bearing plate, the bearing plate transmits the axial pressure to the thrust bearing, and the thrust bearing transmits the axial pressure to the tubing string. At the same time, a hydraulic tubing wrench or a power turntable can be used to provide circumferential rotation power for the tubing string, so that the tubing string can rotate circumferentially while bearing axial drilling pressure. It can simultaneously meet the working conditions of pressurized rotation in coalbed methane shallow well workover operations such as threading and drilling cement plugs, reducing the intensity of manual labor and improving work efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the internal structure.

[0019] Explanation of reference numerals in the attached drawings: 1-fixed seat, 2-support plate, 3-oil pipe string connector, 4-external thread, 5-thrust bearing, 6-support plate flange, 7-fixed seat flange, 8-clearance. Detailed Implementation

[0020] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figure 1 As shown, a rotary head for loading and pressurizing in a shallow coalbed methane well includes a hydraulic pressure head and a fixed base 1; a support plate 2 is rotatably mounted on the top of the fixed base 1, and the pressure head of the hydraulic pressure head abuts against the top of the support plate 2; a tubing string connector 3 is provided at the bottom of the fixed base 1, and the cross-section of the tubing string connector 3 is an inverted trapezoid; an external thread 4 adapted to the internal thread of the tubing string is provided on the outer wall of the tubing string connector 3.

[0022] like Figure 2 As shown, the top of the fixed base 1 is provided with an installation groove, and a thrust bearing 5 is provided in the installation groove; the upper washer and the lower washer of the thrust bearing 5 are connected to the bearing plate 2 and the installation groove, respectively.

[0023] like Figure 1 and Figure 2As shown, the bottom of the load-bearing plate 2 is provided with a load-bearing plate flange 6; the top of the fixing seat 1 is provided with a fixing seat flange 7; the fixing seat flange 7 extends into the interior of the load-bearing plate flange 6, and a gap 8 is provided between the outer wall of the fixing seat flange 7 and the inner wall of the load-bearing plate flange 6.

[0024] like Figure 1 and Figure 2 As shown, tubing string connector 3 is a hollow tube.

[0025] The coalbed methane shallow well loading and pressure applying rotary head provided in this embodiment connects the external thread 4 of the tubing string connector 3 to the internal thread of the tubing string during use. Pressure is applied to the bearing plate 2 by the hydraulic cylinder of the excavator to replace the drilling pressure. The drilling pressure is transmitted to the tubing string through the thrust bearing 5, the fixed seat 1, and the tubing string connector 3. At the same time, a hydraulic tubing wrench or a power turntable can be used to provide circumferential rotation power for the tubing string, so that the tubing string can both transmit drilling pressure and rotate to meet the well workover process requirements.

[0026] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A rotating head for loading and pressurizing a shallow coal bed methane well, characterized by, Includes a hydraulic pressure head and a fixed base (1); The top of the fixed base (1) is rotatably mounted with a bearing plate (2), and the pressure head of the hydraulic pressure head abuts against the top of the bearing plate (2). The bottom of the fixed base (1) is provided with an oil pipe column connector (3), the cross-section of which is an inverted trapezoid; the outer wall of the oil pipe column connector (3) is provided with an external thread (4) that is compatible with the internal thread of the oil pipe column.

2. The rotary head for loading and pressurizing coalbed methane shallow wells according to claim 1, characterized in that, The top of the fixed base (1) is provided with an installation groove, and a thrust bearing (5) is provided in the installation groove; The upper and lower washers of the thrust bearing (5) are connected to the bearing plate (2) and the mounting groove, respectively.

3. The rotary head for loading and pressurizing coalbed methane shallow wells according to claim 1, characterized in that, The bottom of the load-bearing plate (2) is provided with a load-bearing plate flange (6); The top of the fixing seat (1) is provided with a fixing seat flange (7); The fixed seat flange (7) extends into the interior of the bearing plate flange (6), and a gap (8) is provided between the outer wall of the fixed seat flange (7) and the inner wall of the bearing plate flange (6).

4. The rotary head for loading and pressurizing coalbed methane shallow wells according to claim 1, characterized in that, The tubing string connector (3) is a hollow tube.

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