阅读说明：本技术 一种煤层气射孔工艺及其装置 (Coal bed gas perforation process and device thereof ) 是由 尹祖龙 于 2020-04-23 设计创作，主要内容包括：本发明公开了一种煤层气射孔工艺及其装置,包括调节杆,所述调节杆的侧壁焊接有水平杆,且水平杆的侧壁焊接有螺纹筒,螺纹筒内壁拧有气射枪,气射枪的末端开有安装槽,且安装槽内通过螺钉固定有气压机,气压机的输出轴通过联轴器连接有气管,调节杆的底端滑动连接有轨道,气管的下端一侧设置有放置弧,放置弧的侧壁焊接有端板,且两个端板中间焊接有连接杆,端板的侧壁焊接有减震杆,减震杆的侧壁设置有固定杆,固定杆的内腔放置有减震装置,减震装置的底端抵在固定杆的内部底端侧壁上,本发明,利用气射枪带动气管的上下移动,可以实现对管道的气射孔,将气管在调节杆的带动下在轨道内移动,实现不同位置的气射孔,气射孔效率高。(The invention discloses a coal bed gas jet hole process and a device thereof, which comprises an adjusting rod, wherein a horizontal rod is welded on the side wall of the adjusting rod, a threaded cylinder is welded on the side wall of the horizontal rod, a gas jet gun is screwed on the inner wall of the threaded cylinder, the tail end of the gas jet gun is provided with a mounting groove, a gas compressor is fixed in the mounting groove through a screw, the output shaft of the gas compressor is connected with a gas pipe through a coupling, the bottom end of the adjusting rod is connected with a track in a sliding manner, a placing arc is arranged on one side of the lower end of the gas pipe, an end plate is welded on the side wall of the placing arc, a connecting rod is welded between the two end plates, a shock-absorbing rod is welded on the side wall of the end plate, a fixed rod is arranged on the side wall of the shock-absorbing rod, a shock-absorbing device is arranged in the inner cavity of the fixed rod, and the bottom end of the shock-absorbing device is propped against the side wall of the inner bottom end of the fixed rod. The air pipe is driven by the adjusting rod to move in the track, so that air injection holes in different positions are realized, and the air injection hole efficiency is high.)

1. A coal bed gas jet hole process and a device thereof comprise an adjusting rod (1) and are characterized in that a horizontal rod is welded on the side wall of the adjusting rod (1), a threaded cylinder (3) is welded on the side wall of the horizontal rod, a gas jet gun (2) is screwed on the inner wall of the threaded cylinder (3), a mounting groove is formed in the tail end of the gas jet gun (2), a gas compressor (4) is fixed in the mounting groove through screws, an air pipe (5) is connected to an output shaft of the gas compressor (4) through a coupler, a track (6) is slidably connected to the bottom end of the adjusting rod (1), a sliding groove is riveted to the upper end of the track (6) and is slidably connected with the sliding groove riveted to the bottom end of the adjusting rod (1), a placing arc (7) is arranged on one side of the lower end of the gas pipe (5), an end plate (8) is welded on the side wall of the placing arc (7), and a connecting rod (12) is welded between the two end plates (8), the side wall of the end plate (8) is welded with a shock-absorbing rod (9) through a connecting plate in sliding connection, the side wall of the shock-absorbing rod (9) is provided with a fixed rod (10), the fixed rod (10) is of a cavity structure, a shock-absorbing device (11) is placed in an inner cavity of the fixed rod (10), the bottom end of the shock-absorbing device (11) abuts against the side wall of the inner bottom end of the fixed rod (10), and the gas jet gun is sequentially provided with a shock absorber, a voltage sensing switch downhole tool, a power rotating downhole tool, an instrument dynamic controller, an addressable release downhole tool and magnetic positioning from top to bottom;

the method comprises the following steps:

s1, conveying the oriented perforating instrument string to a target layer by a cable, carrying out depth correction by a magnetic positioning CCL or a shockproof GR to enable a perforating gun to be aligned with a reservoir layer to be perforated, S2, operating a dynamic controller IDC through a multifunctional panel MPP to open a supporting arm and fix the supporting arm in a casing, controlling a power rotating downhole instrument PSJ to rotate a gun body to a preset angle, operating the IDC to retract the supporting arm to complete oriented perforation, S3, adopting two oriented perforations to shoot the casing with an included angle of 180 degrees respectively, and designing the hole density to be 8 holes per meter according to perforation optimization.

2. The coal bed gas perforation process and the device thereof according to claim 1, wherein the placing arcs (7) are arranged in two opposite directions, and the placing arcs (7) are arranged at the two ends of the adjusting rod (1) in the shape of circular arcs.

3. The coal bed gas perforation process and the device thereof according to claim 1, wherein telescopic rods are arranged inside the connecting rod (12) and the shock absorption rod (9), and two ends of each telescopic rod are connected with inner walls of two ends of the connecting rod (12) and the shock absorption rod (9) in a welding manner.

4. The coal bed gas perforation process and the device thereof according to claim 1, wherein the side wall of the end plate (8) is riveted with a sliding groove, and the side wall of the connecting plate arranged at one side of the end plate (8) is riveted with a sliding groove, and the two sliding grooves are connected in a sliding way.

5. The coal bed gas perforating process and device thereof as claimed in claim 1, characterized in that the top end of the gas perforating gun (2) is welded with a disc, and the upper end side wall of the disc is welded with a vertically arranged handle.

6. The coal bed gas perforation process and the device thereof as claimed in claim 1, wherein the inner wall of the fixing rod (10) close to the damping rod (9) is provided with a clamping block on both inner walls, and wherein one end of the damping rod (9) extends into the cavity of the fixing rod (10) through the gap between the clamping blocks, the damping rod (9) is connected with the clamping blocks in a sliding manner, and the vertical rod body width of the damping rod (9) is larger than the gap width between the two clamping blocks.

Technical Field

The invention relates to the technical field of coal bed gas injection using equipment, in particular to a coal bed gas injection hole process and a device thereof.

Background

When the existing coal bed gas exploitation is completed by using a casing, professional perforation construction needs to be carried out so as to achieve the purpose of communicating a shaft and a coal bed, and the special casing is a crucial ring in coal bed gas ground extraction engineering and directly determines the yield of the coal bed gas of a single well.

The method is limited by the existing process concept and technology, the included angle between the coal bed gas production well and the coal bed has to be ignored, the included angle between the perforation hole site and the shaft is 90 degrees, so that most of the formed holes penetrate through the coal bed and are communicated with the upper interlayer and the lower interlayer, the interlayer is synchronously fractured when fracturing is implemented in the later period, the interlayer is transformed, even more, the upper interlayer and the lower interlayer are communicated, the water content of the coal bed is increased, the gradual slowing of the pressure of the coal bed is reduced, the analytic gas quantity is reduced, and the yield of a single well is low.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a coal bed gas perforating process and a device thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

a coal bed gas perforation process and a device thereof comprise an adjusting rod, wherein a horizontal rod is welded on the side wall of the adjusting rod, a thread cylinder is welded on the side wall of the horizontal rod, a gas injection gun is screwed on the inner wall of the thread cylinder, the tail end of the gas injection gun is provided with a mounting groove, a gas compressor is fixed in the mounting groove through a screw, the output shaft of the gas compressor is connected with a gas pipe through a coupler, the bottom end of the adjusting rod is connected with a track in a sliding manner, the upper end of the track is riveted with a sliding groove, the sliding groove is connected with the sliding groove riveted with the bottom end of the adjusting rod in a sliding manner, a placing arc is arranged on one side of the lower end of the gas pipe, an end plate is welded on the side wall of the placing arc through a through hole, a connecting rod is welded between the two end plates, a damping rod is welded on the side wall of the end plate through the connecting plate in a sliding manner, a fixing rod is provided with a fixing rod, the inner cavity structure is placed in the inner cavity of the fixing rod, and the bottom end of the damping device is abutted against the inner bottom side wall of the fixing rod, the gas jet gun is sequentially provided with a shock absorber, a voltage sensing switch well descending instrument, a power rotating well descending instrument, an instrument dynamic controller, an addressable release well descending instrument and magnetic positioning from top to bottom;

the method comprises the following steps:

s1, the orientation perforating instrument string is conveyed to a target layer through a cable, and depth correction is carried out through a CCL (shock-proof GR) so that a perforating gun is aligned with a reservoir layer to be perforated.

S2, operating the dynamic controller IDC through the multifunctional panel MPP to open the supporting arm and fix the supporting arm in the casing, then controlling the power to rotate the downhole tool PSJ to rotate the gun body to a preset angle, operating the IDC to retract the supporting arm, and completing the oriented perforation.

S3 the included angles of the casing shooting and opening by adopting two-azimuth directional perforation are respectively 180 degrees, and the hole density can be designed to be 8 holes per meter according to the perforation optimization. The directional perforation process is structurally divided into an outer directional perforation process and an inner directional perforation process.

Preferably, the placing arcs are arranged oppositely, and the placing arcs are arranged at two ends of the adjusting rod in an arc shape.

Preferably, the inside of connecting rod and shock absorber pole all sets up the telescopic link, and the both ends of telescopic link and the both ends inner wall welded connection of connecting rod and shock absorber pole.

Preferably, the side wall of the end plate is riveted with a sliding groove, and the side wall of the connecting plate arranged on one side of the end plate is riveted with a sliding groove which is connected with the two sliding grooves in a sliding manner.

Preferably, the top welding of air shot rifle has the disc, and the upper end lateral wall welding of disc has the handle of vertical setting.

Preferably, the inner wall of the fixed rod is close to the inner walls of the two sides of the shock absorption rod, the clamping blocks are arranged on the inner walls of the two sides of the fixed rod, one end of the shock absorption rod extends into the cavity of the fixed rod through a gap between the clamping blocks, the shock absorption rod is connected with the clamping blocks in a sliding mode, and the width of the vertical rod body of the shock absorption rod is larger than the width of the gap between the two clamping blocks.

The invention has the beneficial effects that:

1. according to the invention, the air injection gun is arranged in the threaded barrel in a threaded manner, the air injection gun can move up and down in the threaded barrel by rotating the disc, the air injection gun drives the air pipe to move up and down, the air pipe is directly moved down after the position of the fixed air injection hole is conveniently fixed, the pipeline is subjected to air injection under the driving rotation of the air compressor, the air injection gun drives the air pipe to move up after the air injection hole is finished, the air injection hole is convenient, fast and safe, the efficiency is high, the working strength of workers is reduced, the air pipe can be protected in the threaded barrel when the air injection hole of the pipeline is stopped, and the outer wall of the pipeline can be prevented from being scratched by the air pipe in the moving process.

2. According to the invention, the coal bed blocks are placed in the placing arcs, the distance between the two placing arcs can be adjusted by the extension and retraction of the telescopic rods according to the diameters of the coal bed blocks, so that the pipeline is stably clamped in the placing arcs, the shock absorption rod at the outer end of the placing arc can play a shock absorption role due to the shock brought by the drill bit in the gas jet hole process, the pipeline can also be protected, the pipeline cracking caused by the shock in the gas jet hole process can also be prevented, the quality after the gas jet hole is ensured, and the gas jet hole efficiency is improved.

3. The method overcomes the defect that the original perforation process perforates the stratums including the upper and lower top plates of the coal bed together, increases the breaking degree of the coal bed, improves the porosity and the permeability of the coal bed, relieves the binding pressure of the coal bed, improves the breaking degree of the coal bed, and realizes the maximization of the coal bed gas analysis.

Drawings

FIG. 1 is a schematic structural view of a coalbed methane perforation process and a device thereof according to the present invention;

fig. 2 is a schematic side view of a coalbed methane perforation process and a device thereof according to the present invention.

In the figure: 1 adjusting rod, 2 air-jet guns, 3 threaded cylinders, 4 air presses, 5 air pipes, 6 tracks, 7 placing arcs, 8 end plates, 9 shock-absorbing rods, 10 fixing rods, 11 shock-absorbing devices and 12 connecting rods.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

1. Referring to fig. 1-2, a coal bed gas perforation process and a device thereof, comprising an adjusting rod 1, wherein a horizontal rod is welded on the side wall of the adjusting rod 1, a thread cylinder 3 is welded on the side wall of the horizontal rod, a gas injection gun 2 is screwed on the inner wall of the thread cylinder 3, a disc is welded on the top end of the gas injection gun 2, a vertically arranged handle is welded on the side wall of the upper end of the disc, the gas injection gun 2 can move up and down in the thread cylinder 3 by rotating the disc, the gas injection gun 2 drives a gas pipe 5 to move up and down, the gas pipe 5 is directly moved down after the position of the gas injection hole is fixed conveniently, the gas pipe 5 is driven to rotate by a gas compressor 4, the gas pipe 5 is protected in the thread cylinder 3 after the gas injection hole is finished, the gas injection gun 2 drives the gas pipe 5 to move up, the gas injection hole is convenient, fast and safe, the efficiency is high, the working strength of workers is reduced, when the gas injection hole of the pipe is stopped, the outer wall of the pipeline can be prevented from being scratched in the moving process of the air pipe 5, the tail end of the air injection gun 2 is provided with a mounting groove, the air compressor 4 is fixed in the mounting groove through a screw, the output shaft of the air compressor 4 is connected with the air pipe 5 through a coupler, the bottom end of the adjusting rod 1 is slidably connected with a rail 6, the upper end of the rail 6 is riveted with a sliding groove, the sliding groove is slidably connected with the sliding groove riveted at the bottom end of the adjusting rod 1, one side of the lower end of the air pipe 5 is provided with two placing arcs 7, the two placing arcs 7 are opposite, the placing arcs 7 are arranged at the two ends of the adjusting rod 1 in an arc shape, the coal seam blocks are placed in the placing arcs 7, the telescopic rod can be stretched and stretched to adjust the distance between the two placing arcs 7 according to the diameter of the coal seam blocks, so that the pipeline is stably clamped in the placing arcs 7, and the drill bit vibrates in the air injection hole process, the shock-absorbing rod 9 arranged at the outer end of the arc 7 can play a shock-absorbing role, can also protect a pipeline, and can also prevent the pipeline from cracking caused by vibration in the process of gas jet hole, so that the quality after the gas jet hole is ensured, and the efficiency of the gas jet hole is improved, the side wall of the arc 7 is provided with a through hole and welded with the end plate 8, the connecting rod 12 is welded between the two end plates 8, the telescopic rods are arranged in the connecting rod 12 and the shock-absorbing rod 9, the two ends of the telescopic rods are welded with the inner walls of the two ends of the connecting rod 12 and the shock-absorbing rod 9, the side wall of the end plate 8 is riveted with a sliding groove, the side wall of the connecting plate arranged at one side of the end plate 8 is riveted with a sliding groove, the two sliding grooves are connected in a sliding manner, the shock-absorbing rod 9 is welded on the side wall of the end plate 8 through the connecting plate in a sliding manner, the side wall of the shock-absorbing rod 9 is provided with a fixed rod 10, the fixed rod 10 is of a cavity structure, and the shock-absorbing device 11 is arranged in the inner cavity of the fixed rod 10, the bottom end of the damping device 11 is abutted against the side wall of the bottom end inside the fixed rod 10, the inner walls of the fixed rod 10 close to the inner walls of the two sides of the damping rod 9 are provided with clamping blocks, one end of the damping rod 9 extends into a cavity of the fixed rod 10 through a gap between the clamping blocks, the damping rod 9 is connected with the clamping blocks in a sliding mode, the vertical rod body width of the damping rod 9 is larger than the gap width between the two clamping blocks, in the air jet hole process, the rail 6 can be connected with the adjusting rod 1 in a sliding mode, the adjusting rod 1 drives the air pipe 5 to move along the rail 6 and linearly move on one side of the pipeline, a plurality of holes can be formed in the same coal layer block channel according to the requirement of an air jet hole, the positioning time for the position of the air jet hole is saved, the quality and the efficiency of air jet hole are improved, a damper, a voltage sensing switch well descending instrument and a power rotating well descending instrument are sequentially arranged from top to bottom in the air jet hole, The device comprises an instrument dynamic controller, an addressable release downhole instrument and magnetic positioning;

the method comprises the following steps:

s1, the orientation perforating instrument string is conveyed to a target layer through a cable, and depth correction is carried out through a CCL (shock-proof GR) so that a perforating gun is aligned with a reservoir layer to be perforated.

S2, operating the dynamic controller IDC through the multifunctional panel MPP to open the supporting arm and fix the supporting arm in the casing, then controlling the power to rotate the downhole tool PSJ to rotate the gun body to a preset angle, operating the IDC to retract the supporting arm, and completing the oriented perforation.

S3 the included angles of the casing shooting and opening by adopting two-azimuth directional perforation are respectively 180 degrees, and the hole density can be designed to be 8 holes per meter according to the perforation optimization. The directional perforating process is structurally divided into an external directional perforating process and an internal directional perforating process

The working principle is as follows: firstly, according to the diameter size of a coal seam block needing gas perforation, the distance between two ends of two placing arcs 7 is adjusted by using a telescopic rod, then the coal seam block is horizontally placed in the middle of the placing arcs 7, then the adjusting rod 1 is made to slide in the track 6 by using sliding connection, the gas pipe 5 is accurately adjusted to the position needing gas perforation, then the gas pipe 5 is driven by the gas injection gun 2 to rotate to the outer side of the threaded barrel 3 from the inner cavity of the threaded barrel 3, the gas compressor 4 is started to enable the gas pipe 5 to rotate, a disc is slowly rotated by using a handle, the gas pipe 5 is enabled to approach the coal seam block, and gas perforation is conducted.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.