SU1448078A1 - Method of degassing a coal-rock mass portion - Google Patents

Abstract

This invention relates to the mining industry. The goal is to increase the efficiency of extraction of the working oil and gas from the coal-coal massif. A well directed from the surface of the drill hole. Its horizontal or sloping section passes through the seam. The well casing and perforation of the horizontal or inclined casing is produced. Next, the working fluid is injected at intervals with a rate exceeding the natural pickup of the array and the formation of a gas-conducting reservoir. Then, a vertical well is drilled from the bottom of the FTO to the dip of the hydrotreatment interval. The vertical wellbore located from the perforated holes of the gas-conductor col- lector at a distance of no more than 2/3 of the radius of this interval. Extracting the working fluid and gas from the treated carbon massif ocyiitecT- is through a vertical well. This allows the pumping of liquid and gas from the entire zone of the processed. Ma-. Siwa. 2 Il. S (l

Description

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The invention is applicable to the mining industry and is intended for the degassing of the coal and rock mass through wells drilled from the surface.

The purpose of the invention is to increase the efficiency | (

processing all Intervals by hydr. - leaching bridges or blocks, thus the horizontal section is a hydraulic manifold providing hydraulic connection between the intervals

The lower boundary of the pumped working fluid is at a depth of 1,400 m. Thus, the height of the column of continuously pumped water will be 450 m, which prevents gas from draining from the well: Water will enter the well only through excessive

the ability to extract the working fluid hydrotreatment. The vertical part of the well and gas from the coal massif array, where it is possible to install water-discharge plants. In FIG. I depicts an ex- isting device that is 250 m. Of degassing a section of the coal and rock massif; in fig. 2 - the same, top view.

The method is carried out by the following procedure.

A drilled directional block I is drilled, the end of which is horizontal or inclined 2 and passes through the treated formation of coal mass array 3. By forming perforations - 5 pressure. For a more complete removal of Tium 4, each inter- rupt is opened and the shaft is extracted at a higher speed and the calculation is compressed at intervals lower by the fall of the intercom volume of the working fluid at a rate. The hydrotreatment shaft was drilled to exceed the described surface injectivity of the vertical well. The trunk of the processed array. During the period of the turn of the axis, it was detached from the perforated-interval hydroprocessing to isolate each orifice of the gas-hydraulic conductive arc processed interval. After the hydro-collector at a distance of 50 m. The diameter of the drilling of all intervals is the insulating well 190 mm, the diameter of the casing material is removed from the inclined or horizontal column 146 mm. The well of the perforated area, forming a treated reservoir hydropro- duced over the whole power, providing the connection of all 25 coal-bearing massifs. Water pumping

processed intervals. A vertical well 5 is drilled from the surface into the zone of the lower-dip formation hydrotreatment interval 5. The wellbore of this well is positioned from the gas-conducting reservoir on

produced by a deep well pump installed in a vertical well. In this way, water was pumped out / From the entire zone of the treated array / the flow of which into the well at an interval of no more than 2/3 of the radius of the interval; This is due only to the excess pressure of the hydrotreatment of R. By the formation of nerve, but also due to the action of the gravitational forces of the water. This allowed to produce high-quality development of the well after

Holes 6 are used to open the coal seam in a vertical well. Then, the working fluid and gas are extracted by pump 7, oiiynieH-tion into the well on the shanks 8.

Example. For processing the coal and rock massif, a well was constructed with a horizontal end of the barrel. The horizontal trunk runs in the direction of the fall

Claims (1)

hydrotreatment array. Invention Formula The method of degassing a section of the coal-bearing massif, which includes drilling from the surface of a well-directional well, has a total of outburst-friendly and gas-bearing sand-40 horizontal or inclined participant, above which is the sweep passing through the formation, its casing, casing perforation, interval pumping of working fluid at a rate exceeding the natural acceleration  - .. array, the formation of gas-conductive 1.2–1.5 m. Depth of sandstone, reservoir and extraction of working fluid in the treatment zone (300 m. Length; drilled; and gas from treated coal and “ array, characterized in that, in order to increase the efficiency of extracting the working fluid and gas from the coal Ierai, the vertical well is additionally drilled from the surface into the zone of the lower formation bed, through which the working fluid and gas are removed from the treated carbon breed, and the trunk is vertical 12,000 m of water at a pace of 40-iOO / 0. 55 wells are positioned from the airborne Isolation intervals; nprf gas-conductive reservoir orifices are made at a distance of no more than 2/3 of the radius of the lower hydrotreating interval. batty unprotected outburst coal seam. Both coal seam and sandstone have a dip angle of 11 °. Sandstone thickness 40-60 m, coal seam Noah wells 1865 m, drilling diameter 216 mm. The well is fastened with steel casing pipes with a diameter of 146 mm and a wall thickness of 10.7 mm. Hydroprocessing of the coal-bearing massif was carried out in No. 7, cutting the horizontal part of the well in seven intervals. Estimated radius of Hydrobreating of one interval of 120 m. Into each hydrotreating interval pumped nti Helps to install a cement bridge and a dispersed material. After processing all Intervals by hydr. - leaching bridges or blocks, thus the horizontal section is a hydraulic manifold providing hydraulic connection between the intervals hydrotreatment. The vertical part of the well, where it is possible to install water pumps. The lower boundary of the pumped working fluid is at a depth of 1,400 m. Thus, the height of the column of permanently non-pumped water will be 450 m, which prevents the gas from flowing out of the well: excess account The devices are 250 m. pressure. For a more complete removal of water and an increase in the rate of extraction of the lower inter-dip over the entire power of the treated coal and rock mass. Water pumping produced by a deep well pump installed in a vertical well. In this way, water was pumped out / From the entire zone of the treated array / the flow of which into the well occurs not only due to excessive pressure, but also due to the action of gravitational forces of water. This allowed to produce high-quality development of the well after hydrotreatment array. Invention Formula V / 5N vV4VvvCNX xNV Phie.1