Novel special water tail for coal bed gas exploitation

Abstract

The utility model relates to the field of drill column water pipe adapters, in particular to a novel special water tail for coal bed gas exploitation. Comprising a center shaft, a head pipe is installed at the front end of the center shaft in a threaded mode, one side of the head pipe is in threaded connection with a coal bed gas drill rod, a shell is rotationally installed on the outer side of the center shaft through a tapered roller bearing, and one side of the shell is in threaded connection with a tail pipe. The water tail is mainly used for conveying drilling fluid and can rotate together with a coal drill rod, the tail portion of the water tail is mainly connected with a slurry pump water outlet pipe, and input and conversion work of power media is guaranteed. The water tail is simple in structure, convenient to maintain, reasonable and applicable, can be suitable for drilling operation of various types of coal drill rods, and meets the requirement for site construction of a kilometer directional drilling machine.

Description

Technical Field

[0001] The utility model relates to the field of drill column water pipe adapters, in particular to a new special water tail for coal bed gas mining. Background Art

[0002] The tail of coalbed methane mining is mainly used to connect the drill string and the water pipe. The internal structure of the tail is designed to offset the torque transmitted by the drill string, so as to achieve the functional requirement that the drill string rotates while the water pipe is relatively static. In the prior art, the tail is a whole, which is not very versatile, has a single structure for connecting with the water pipe, and has a narrow scope of application. In addition, the tail of a large size is heavy and is not suitable for drilling tool operation. Utility Model Content

[0003] The purpose of the utility model is to provide a new type of special water tail for coalbed methane mining to solve the above problems. To solve the above problems, the utility model adopts the following technical solutions:

[0004] A new type of special water tail for coalbed methane mining includes a central shaft, a head pipe is threadedly installed at the front end of the central shaft, a coalbed methane drill pipe is threadedly connected to one side of the head pipe, an outer shell is rotatably installed on the outer side of the central shaft through a tapered roller bearing, and a tail pipe is threadedly connected to one side of the outer shell.

[0005] As a further improvement of the utility model, both the inner and outer ends of the head pipe are provided with threads, and a bolt nut is installed at the inner threaded end of the head pipe.

[0006] As a further improvement of the utility model, an O-shaped sealing ring is installed between the central shaft and the head pipe, a stopper is installed on the right side of the central shaft, and an elastic retaining ring for the shaft is arranged on the right side of the stopper.

[0007] As a further improvement of the utility model, a top cylinder is installed on one side of the tapered roller bearing, the tapered roller bearing is installed between the top cylinder and the block and fixed to the outside of the central axis through an elastic retaining ring of the shaft, a sealing seat is installed on the outside of the tapered roller bearing, a first shaft rotating seal and a second shaft rotating seal are respectively installed on both sides of the tapered roller bearing, and a sealing ring is installed between the sealing seat and the outer shell.

[0008] As a further improvement of the utility model, the shell and the tail pipe are reinforced by a hexagonal cone-end set screw, a first O-ring is installed between the tail pipe and the shell, and one side of the tail pipe is connected to a quick-connect conversion head by a thread.

[0009] As a further improvement of the present invention, the central axis, the head pipe and the tail pipe are all hollow tubes.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] The utility model adopts a split structure, which is lighter, smaller and easier to carry. Drill pipes of different specifications can be connected by replacing the tail pipe, which is more versatile. The tail pipe connection water pipe structure has two connection forms: threaded connection and U-pin quick connection, which can be adjusted by adding or removing the quick-connect conversion head according to the on-site conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] In the figure - 1, head pipe; 2, O-ring; 3, bolt nut; 4, rotary seal for the first shaft; 5, tapered roller bearing; 6, housing; 7, top tube; 8, stopper; 9, elastic retaining ring for the shaft; 10, sealing seat; 11, rotary seal for the second shaft; 12, first O-ring; 13, center shaft; 14, hexagonal tapered end set screw; 15, tail pipe; 16, quick-connect conversion head. DETAILED DESCRIPTION

[0015] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0016] In order to enable those skilled in the art to better understand the present application, the following will be combined with the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application. Figure 1 As shown, a new type of special water tail for coalbed methane extraction includes a central shaft 13, a head pipe 1 is threadedly installed at the front end of the central shaft 13, a coalbed methane drill pipe is threadedly connected to one side of the head pipe 1, and a tail pipe 15 is threadedly connected to the other side of the central shaft 13. The outer side of the central shaft 13 is rotatably installed with a shell 6 through a tapered roller bearing 5.

[0017] The inner and outer ends of the head pipe 1 are both provided with threads, and a bolt nut 3 is installed at the inner threaded end of the head pipe 1 .

[0018] This design can prevent the threaded connection of the head pipe 1 joint from loosening. The head pipe 1 of different specifications and sizes can be replaced according to different construction well conditions to connect coal drill pipes of corresponding specifications. The head pipe 1 and the tail pipe 15 are flattened to meet the needs of rapid disassembly and assembly using standard tools. The tail pipe connection water pipe structure has two connection forms: threaded connection and U-pin quick connection. The quick-connect conversion head can be installed or removed for adjustment according to the on-site conditions.

[0019] An O-type sealing ring 2 is installed between the central shaft 13 and the head pipe 1. Such a design can ensure the sealing performance of the joint between the central shaft 13 and the head pipe 1.

[0020] A top cylinder 7 is installed on one side of the tapered roller bearing 5. The tapered roller bearing 5 is installed between the top cylinder 7 and the stopper 8 and fixed to the outside of the central shaft 13 through the shaft elastic retaining ring 9. A sealing seat 10 is installed on the outside of the tapered roller bearing 5. A housing 6 is installed on the outside of the tapered roller bearing 5. The first shaft rotary seal 4 and the second shaft rotary seal 11 are installed on both sides of the tapered roller bearing 5, respectively. A sealing ring is installed between the sealing seat 10 and the housing 6. Such a design limits the axial displacement of the tapered roller bearing 5 through the threaded connection between the stopper 8 and the central shaft 13, and prevents the stopper 8 from being loosened through the shaft elastic retaining ring 9. The tapered roller bearing 5 is fixed with a sealing seat 10, and the outer ring of the tapered roller bearing 5 is sealed between the housing 6 and the central shaft 13. A sealing ring is installed on the housing 6 and the sealing seat 10 to ensure that the tapered roller bearing 5 operates in a dust-free environment.

[0021] The housing 6 and the tail pipe 15 are reinforced by the hexagonal cone-end set screw 14, and the first O-ring 12 is installed between the tail pipe 15 and the housing 6. One side of the tail pipe 15 is connected to the quick-connect conversion head 16 through a thread. This design further ensures that the tapered roller bearing 5 is fixed in position, and after the thread is tightened, the housing 6 and the tail pipe 15 are equipped with a processing positioning threaded hole and the hexagonal cone-end set screw 14 is installed to ensure that the thread does not loosen. The right end of the tail pipe 15 is connected to the quick-connect conversion head 16 through a thread.

[0022] The central axis 13 , the head pipe 1 , and the tail pipe 15 are all hollow tubes.

[0023] The working principle of the utility model is that the head pipe 1 and the quick-connect conversion head 16 of the new water tail need to be selectively installed according to the downhole conditions, and the central shaft 13 part does not need to be adjusted. The corresponding head pipe 1 joint is selected according to the thread type of the drill string, and the head pipe 1 is connected to the drill pipe. At the same time, the connection form of the tail pipe 15 is determined according to the connection type of the faucet to select whether to install the quick-connect conversion head 16. After the installation, the central shaft 13 is threadedly connected to the head pipe 1, and the connection thread is locked by the bolt nut 3. When the drill pipe is rotating and drilling, the rotation torque can be offset by the rotation of the tapered roller bearing 5, ensuring that the tail pipe 15 connected to the water pipe is relatively stationary, thereby ensuring the use requirements.

[0024] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A new type of special tailings for coalbed methane mining, characterized in that: It comprises a central shaft, a head pipe is threadedly installed at the front end of the central shaft, a coal-bed methane drill pipe is threadedly connected to one side of the head pipe, a shell is rotatably installed on the outer side of the central shaft through a tapered roller bearing, and a tail pipe is threadedly connected to one side of the shell; threads are arranged at the inner and outer ends of the head pipe, and a bolt nut is installed at the inner threaded end of the head pipe; an O-ring is installed between the central shaft and the head pipe, a block is installed on the right side of the central shaft, and an elastic retaining ring for shaft is arranged on the right side of the block; a top cylinder is installed on one side of the tapered roller bearing, the tapered roller bearing is installed between the top cylinder and the block and is fixed to the outer side of the central shaft through an elastic retaining ring for shaft, a sealing seat is installed on the outer side of the tapered roller bearing, a first shaft rotating seal and a second shaft rotating seal are respectively installed on both sides of the tapered roller bearing, and a sealing ring is installed between the sealing seat and the shell; the shell and the tail pipe are reinforced by internal hexagonal cone end set screws, a first O-ring is installed between the tail pipe and the shell, and one side of the tail pipe is connected to a quick-connect conversion head through threads.

2. A new type of special water tail for coalbed methane mining according to claim 1, characterized in that: The central axis, the head pipe and the tail pipe are all hollow tubes.

Images