Coalbed methane mining method in horizontal open-hole diversion tank well and Tanghulu well

A horizontal open hole and diversion groove technology, which is applied in the fields of production fluids, wellbore/well components, and earth-moving drilling, etc., can solve the problems of easily polluted coal seams, clogging of fracture diversion channels, and easy clogging of coal seams.

Inactive Publication Date: 2011-12-28
王建生
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the low gas production of vertical wells, which is not conducive to the management of centralized drainage and gas recovery, and the production cost is high, especially the enhanced fracturing causes a large amount of pulverized coal to be produced in the process of drainage and gas recovery, which leads to the diversion of fractures in the coal seam Channel blockage will reduce gas and water production, and even bury the drainage pipe string, resulting in the shortcomings of frequent workover. In order to overcome the pollution of coal seams during drilling of horizontal wells, horizontal multi-branch wells and inverted umbrella well groups, and the coal seams during drainage Collapse is easy to block the wellbore, it is difficult to maintain the wellbore due to collapse and blockage, the coal seam in the large horizontal open hole section cannot be strengthened and reformed, and the original gas-liquid drainage and diversion channels (cracks, cracks) have limited capacity, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Coalbed methane mining method in horizontal open-hole diversion tank well and Tanghulu well
  • Coalbed methane mining method in horizontal open-hole diversion tank well and Tanghulu well
  • Coalbed methane mining method in horizontal open-hole diversion tank well and Tanghulu well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] Such as figure 1 As shown, the cutting of the high-pressure air-water mixed liquid fluid is carried out by the surface pump car group 2 and the air compression booster car group 3 with a certain displacement and a certain proportion of the air-water mixed liquid 5 under a certain high pressure condition. The surface manifold system 4 is injected into the downhole working string moving back and forth - the tubing 8 with the fluid cutting gun 11 or the coiled tubing 8 . Due to the throttling effect of the nozzle 12 of the cutting gun 11, a pressure difference of 15-20 MPa is formed inside and outside the cutting gun 11, and the high-pressure gas-water mixed flow 5 ejected by the spray gun 11 has a strong cutting effect on the coal seam 15 around the wellbore 10 , under the continuous action of this fluid cutting operation, diversion grooves 13 and fluid cutting caves 14 can be formed in the coal seam 15 around the wellbore 10 . At the same time, the coal chips cut from t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method of cutting a set of diversion grooves with a certain depth and phase angle in the coal seam near the wellbore by using a fluid cutting gun in a horizontal open-hole section of a coal seam, and using a high-pressure air-water mixed fluid to form the diversion grooves well, and in the horizontal well section of the coal seam, alternately cut diversion grooves and a series of caves with a certain spacing and a certain diameter to form a series of cave wells connected by the wellbore and the diversion groove - Tanghulu well, and the two types of wells. A method for exploiting coalbed methane by forming a well group.

Description

[0001] The invention relates to a coalbed methane mining method in the field of coalbed methane mining, in particular to a method of using a fluid cutting gun in the horizontal open hole section of the coal seam, and using a high-pressure air-water mixed fluid to cut a group of holes with a certain depth in the coal seam near the wellbore. Diversion grooves with phase angles form diversion groove wells, and alternately cut diversion grooves and a series of cutting caves with a certain spacing and a certain diameter in the horizontal well section of the coal seam to form caves connected by wellbore and diversion grooves The method of exploiting coalbed methane by stringing wells-tanghulu wells and the well group composed of the second type of wells. Background technique [0002] In the field of coalbed methane exploration and exploitation, the mining of coalbed methane is usually achieved by drilling coalbed methane wells and desorbing methane gas in the coal seam to produce it ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00
Inventor 王建生王星锦
Owner 王建生
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products