Progressive shielding type gas depressurizing extraction method
A gas and drainage technology, which is applied in the field of progressive shielding gas pressure relief drainage, can solve the problems of increasing the influence range and pressure relief effect of drilling through layers, and the poor applicability of drilling pressure relief and anti-reflection technology, and achieves good results. The effect of pressure relief and anti-reflection, avoiding the disappearing blank zone, and increasing the effect of the influence range
Active Publication Date: 2017-06-27
CHINA UNIV OF MINING & TECH
View PDF6 Cites 10 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] Technical problem: The purpose of the present invention is to overcome the deficiencies in the prior art and provide a safe, efficient and economical solution that can effectively solve the problem of poor applicability of the existing drilling pressure relief and anti-reflection technology, combined with hydraulic punching With the technical advantages of hydraulic slotting, the coupling mode of ordinary drilling and "drilling-punching-cutting" drilling under the condition of floor penetration is established, and the drilling is divided into partition holes, cover holes and pressure relief holes. The sequence of hole construction and its spatial location increase the impact range and pressure relief effect of drilling through layers, thereby realizing efficient regional gas drainage
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0020] The progressive cover gas pressure relief drainage method of the present invention comprises the following steps:
[0021] a. From the floor lane 1 to the coal seam 2 on both sides of the upper coal lane 3, the upper partition hole and the lower partition hole are constructed through the layer; the upper partition hole and the lower partition hole are at least 2 each, and the holes between the upper partition holes The spacing and the hole spacing a between the upper partition holes are 2.5-3.5m respectively.
[0022] b. Perform gas pre-drainage on the upper partition hole and the lower partition hole, the upper partition hole drains the gas to block the gas from the upper side of the coal roadway from migrating to the coal roadway 3, and the lower partition hole drains the gas to block the gas from the lower side of the coal roadway to the coal roadway 3 transport;
[0023] c. Between the upper cut-off hole and the lower cut-off hole, construct a plurality of interlay...
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
| Property | Measurement | Unit |
|---|---|---|
| Hole spacing | aaaaa | aaaaa |
Login to View More
Abstract
The invention provides a progressive shielding type gas depressurizing extraction method which is particularly suitable for depressurizing outburst elimination extraction of coal roadway strip gas in a soft high-outburst coal seam through seam-penetration drilling holes. The seam-penetration drilling holes are constructed in the portions, on the two sides of an upper coal roadway, of the coal seam from a base plate roadway. Since the high-gas-outburst coal seam has high outburst tendency, the depressurizing permeation increasing measure of direct drilling hole construction can cause severe disturbance to an original coal body to induce a hole jetting phenomenon, the coupling mode of common drilling holes and punching and cutting drilling holes under the condition of base plate seam penetration is built, and the drilling holes are divided into the partition holes, the shielding holes and the depressurizing holes. Through reasonable arrangement of the common seam-penetration drilling holes and the drilling, punching and cutting drilling coupled depressurizing drilling holes, the gas extraction effect of the area coal body is improved, the phenomena of an outburst elimination blanking zone and hole jetting are voided, the drilling construction speed in remarkably increased, and the gas extraction effect is remarkably improved, and the technology has good adaptability to all coal seams of different occurrence states.
Description
technical field [0001] The invention relates to a progressive shielding gas pressure relief extraction method, which is especially suitable for the coal seam area where the gas pressure reaches 2.0 MPa or a dynamic phenomenon occurs during drilling, and belongs to the technical field of coal seam mining with high gas outburst. Background technique [0002] The coal seams with high gas outbursts in my country have the characteristics of microporosity, low permeability and high adsorption, which makes pre-mining gas pre-extraction difficult and the effect of gas pre-extraction poor. Therefore, special measures must be taken to increase the gas permeability of coal seams and improve the gas drainage rate. Hydraulic measures such as hydraulic slotting and hydraulic punching are currently the main methods for pressure relief and permeability enhancement. By destroying the coal body in the borehole, a pressure relief space is formed to increase the permeability of the surrounding c...
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
Login to View More IPC IPC(8): E21F7/00E21B43/26
CPCE21B43/26E21F7/00
Inventor 林柏泉刘统王一涵李贺杨威刘厅高亚斌胡欣然
Owner CHINA UNIV OF MINING & TECH