CN-117345171-B - Method for mining thick reservoir gas mine

CN117345171BCN 117345171 BCN117345171 BCN 117345171BCN-117345171-B

Abstract

The invention discloses a thick reservoir gas mine exploitation method, which comprises the steps of excavating a three-dimensional borehole and a plurality of horizontal boreholes perpendicular to the three-dimensional borehole, cutting a plurality of cracks on a gas storage layer perpendicular to the direction of the horizontal boreholes by using perforating equipment in the horizontal boreholes to form a plurality of crack areas, coupling the cracks among the horizontal boreholes to form a crack through area, arranging a plurality of groups of preset perforators in the horizontal boreholes to conduct segmented fracturing and permeability-increasing surrounding rock, and conducting air extraction by combining an electromagnetic recyclable gas extraction borehole plugging device. The invention strengthens the exploitation of the thick reservoir gas mine by adopting a multi-level layering-segmented fracturing and permeability increasing mode, prolongs the gas mine extraction time and the service life of drilling holes, and improves the air permeability of the gas storage mine and the gas mine extraction efficiency. The electromagnetic plugging bag is arranged, so that the problems of the traditional bag that the hole sealing is not tight and the extraction device is not recoverable are solved, and a new thought is provided for the exploitation of the thick reservoir gas mine.

Inventors

JING MAO
XUE TIANXI
REN JI
WU TAO
SHI HAISHENG
PENG KANG
LUO SONG
JIANG WANFEI
HUANG YANLI
ZUO YUJUN
WEN ZHIJIE
Chang Yangkai
ZHANG YUANSHENG

Assignees

中南大学

Dates

Publication Date: 20260508
Application Date: 20231017

Claims (2)

1. A method for mining a thick reservoir gas mine, comprising the steps of: a. drilling a drilling group in the gas storage layer by using drilling equipment, wherein the three-dimensional drilling penetrates through the covering layer and the gas storage layer, the first horizontal drilling, the second horizontal drilling and the third horizontal drilling follow the trend of the gas storage layer and are perpendicular to the three-dimensional drilling for drilling, and the space between the horizontal drilling is 5-7 meters; b. Cutting a plurality of cracks on an air storage layer perpendicular to the horizontal drilling direction by using perforating equipment in the three horizontal drilling holes to form a plurality of crack areas, coupling the cracks between the horizontal drilling holes to form a crack through area, and arranging a plurality of groups of preset perforators at intervals of 5-6 meters in the deep part of the horizontal drilling holes; c. Assembling an electromagnetic recoverable gas extraction drilling plugging device, namely enabling a thread surface of an exhaust pipe to be matched with a thread surface of a magnetic ring body III and a clamping position body when the exhaust pipe passes through an electromagnetic plugging bag, so that the magnetic ring body III and the clamping position body are fixedly sleeved with the exhaust pipe, further enabling the electromagnetic plugging bag to be fixedly sleeved on the exhaust pipe, enabling a filling pipe to pass through a first shielding bag, then sending a spring clamping body into the first shielding bag, and fastening the filling pipe with the first shielding bag through the spring clamping body; The grouting isolation protection device with the spring clamp body and the injection pipe is sleeved on an electromagnetic plugging bag, and the concrete operation is that two semicircular pipes are combined together, a part between two magnetic ring bodies of a long thin bag and a part between three magnetic ring bodies of the long thin bag are sleeved in the middle to form an isolation protection pipe, the isolation protection bag I with the spring clamp body and the injection pipe and the isolation protection bag II with the injection pipe respectively penetrate through a short thick bag, the closing-in rubber band I is sleeved on an exhaust pipe, the closing-in rubber band II is sleeved on the pipe orifice of the isolation protection pipe, and meanwhile, the inner ends of the isolation protection bag I and the isolation protection bag II are reinforced on the isolation protection pipe by using the semicircular clamp pipe I and the semicircular clamp pipe II; The electromagnetic plugging bag comprises an outer bag and an inner magnetic ring body structure, wherein the outer bag comprises a long and thin bag positioned in the middle part and short and thick bags positioned at two sides, the inner magnetic ring body comprises a first magnetic body positioned in the middle part and a second magnetic body positioned at two sides, the first magnetic body comprises a second magnetic ring body positioned at two ends of the long and thin bag and two third magnetic ring bodies symmetrically arranged at a certain distance from the second magnetic ring body, the second magnetic body comprises a second magnetic ring body and a first magnetic ring body positioned at two sides of the short and thick bag respectively, and a clamping body positioned in the middle part of the second magnetic ring body and the first magnetic ring body, and the magnetism of the second magnetic ring body is opposite to that of the first magnetic ring body and the third magnetic ring body after the second magnetic ring body is electrified; d. The two side bags of the electromagnetic plugging bag are changed into round drums from long strips and are clung to the hole wall, a plugging closed area is formed in the middle of the bag, the pump tank is started, and plugging materials are conveyed to the plugging closed area through the material injection pipe; e. after the plugging material permeates the surrounding rock wall and is solidified and shaped, gas mine extraction is carried out; f. when the gas mine extraction concentration is found to be obviously reduced, controlling the super-wireless control console, remotely starting the preset perforators in the same row in the three horizontal drilling holes, generating new cracks in the horizontal drilling holes, and then carrying out gas mine extraction; g. Repeating the step f, thereby strengthening the exploitation of the thick reservoir gas mine.
2. The method for mining thick reservoir gas mine according to claim 1, wherein the pre-perforating gun is provided with a spring device in the middle, and needle point structures are arranged at two ends, so that the pre-perforating gun can be deeply inserted into the upper and lower rock walls of the horizontal drilling hole under the action of elastic force, and the ultra-wireless control console can remotely start the pre-perforating gun.

Description

Method for mining thick reservoir gas mine Technical Field The invention belongs to the field of gas mine (coal bed gas, shale gas and natural gas) extraction with low permeability, compact rock stratum and thick storage, and particularly relates to a method for extracting gas mine with a thick storage layer. Background With the rapid development of society, the demand for various mineral energy sources is increasing. Therefore, there is an urgent need to develop a new method for facilitating the exploitation of gas ores in reservoirs, ensuring efficient exploitation and utilization of the gas ores. Disclosure of Invention The invention aims to provide a thick reservoir gas mine mining method aiming at the problems of difficult gas mine mining and low mining efficiency of a thick reservoir gas mine. In order to solve the problems, the invention adopts the following technical scheme: The invention provides an electromagnetic recyclable gas extraction drilling plugging device, which is characterized by comprising the following components: the electromagnetic type sealing bag comprises an outer bag and an inner magnetic ring body structure, the outer bag comprises a long and thin bag positioned in the middle and short and thick bags positioned at two sides, the inner magnetic ring body is formed by connecting a first magnetic ring body, a second magnetic ring body, a third magnetic ring body, a clamping body and an elastic cloth bag, the structure of the inner magnetic ring body is matched with that of the outer bag, the electromagnetic type sealing bag comprises a first magnetic ring body positioned in the middle and a second magnetic ring body positioned at two sides, the first magnetic ring body comprises a second magnetic ring body positioned at two ends of the long and thin bag and a third magnetic ring body positioned at a certain distance from the second magnetic ring body, the second magnetic ring body comprises a second magnetic ring body positioned at two sides of the short and thick bag and a clamping body positioned at the middle of the second magnetic ring body, the second magnetic ring body at two ends of the long and thin bag are respectively integrally arranged with the second magnetic ring body positioned at two sides of the short and thick bag, the third magnetic ring body and the clamping body are connected through the elastic cloth bag, the magnetism of the second magnetic ring body is matched with the structure of the outer bag, the second magnetic ring body is opposite to the third magnetic ring body positioned at the two sides of the magnetic ring body, the second magnetic ring body is positioned at the two sides of the second magnetic ring body, the second magnetic ring body is positioned at a certain distance from the second magnetic ring body and the second magnetic ring body is positioned at the middle of the middle, the second magnetic ring body is positioned at the second magnetic ring body and the second magnetic ring body is positioned at the second magnetic ring body and the second magnetic ring body. Further, the first magnetic ring body and the second magnetic ring body are respectively provided with a circular ring clamping device for respectively connecting and clamping the ports of the long thin bag and the short thick bag. Further, threads are arranged on the inner sides of the magnetic ring body III and the clamping position body, threads are also arranged on corresponding positions on the outer side of the extraction pipe, and the magnetic ring body III and the clamping position body are fixed on the extraction pipe through thread matching. Further, the inner sides of the magnetic ring body III and the clamping body are divided into four areas which are vertically and laterally symmetrical, wherein one group of opposite areas are smooth surfaces, one group of opposite areas are threaded surfaces, and threads are arranged at corresponding positions on the outer side of the extraction pipe in the same mode. Further, the wireless intelligent valve is arranged on the short and thick bag, remote control on-off can be realized through the wireless control device, high-pressure energy in the short and thick bag is discharged, and the device is convenient to take out. Further, the grouting separation protection device structure is matched with the electromagnetic type sealing bag structure, the grouting separation protection device comprises a separation protection pipe, a separation protection bag I, a separation protection bag II, a separation protection bag I, a separation protection bag cover and a long magnetic plate, the separation protection pipe is composed of two semicircular pipes which are positioned in the middle area of the grouting separation protection device, the two ends of the separation protection pipe are respectively connected with the separation protection bag I and the separation protection bag II, the separation protection bag I and the separation protect