SU432295A1 - METHOD OF STRUGGLE AGAINST EMISSIONS - Google Patents

Description

The invention relates to the field of the mining industry and is intended for use in the development of gas-bearing and outburst-dangerous steeply dipping coal seams.

A known method of preliminary degassing and combating sudden emissions of coal and gas by drilling degassing wells to the height of the floor from the vent or haulage drift followed by nm connect the well to the vacuum line and suction the gas. Its disadvantage is low productivity in underground drilling and water injection works compared to surface drilling due to the impossibility of using gas mines, dust and sudden outliers in mines, powerful drilling and pumping equipment, and large tools used for drilling and drilling. pumping water.

The purpose of the invention is to improve the efficiency of the hydraulic dissection of the suite of steeply dipping ninx formations. For this, the formation formations are crossed by a directional well across the strike in one horizon.

The proposed method is illustrated in the drawing.

The essence of the invention lies in the fact that svptu layers intersect the directional

well across the horizon. In the overlap of rocks, the vertical part of the squared squire is drilled. At a certain depth, using the existing methods of changing the direction of the P1 well bore, the curvature and the curvilinear part 2 of the wellbore are extended to the reservoir 3. The horizontal suit 4 of the wellbore, horizontal or close to horizontal those / logological slope, which intersects across the strike successively layers 3, 5, 6 and 7 on the subject to work: in the future horizon 8. After intersecting, lay: and the entire well casing 1); oh oi1; e are cemented in CKB; i; -Ki 4c from the bottom to the ground.

With the help of one of the famous known physical metolosis, for example, gamma ray logging, the position of the formation 7 is refined from the bore holes P1Y and the casing is punched holes in the casing against the reservoir; m 1 with sand-perforator compressed tubes. Then, through the image in the casing, the holes erode the HPD method using the same hydraulic perforator ;; flat-status ;; coal seam which

positioned radially with respect to the casing.

After removing the sand residues from the casing, they proceed to hydrotherement of coal silt. To this end, a working fluid, such as water, heavy hydrocarbons and others, with various additions, such as surfactants and others, are pumped into the wellbore through the casing into the wellbore, with or without various additives. Razdvpga natural per unit in the reservoir but cleavage and stratification, the working fluid spreads radially from the well in the reservoir, i.e. there is a separation of the elast. The radius of influence of hydraulic dissection depends on the amount of injected working fluid, its pressure and other parameters and physical and mechanical, metamorphic and other properties of coal.

After termination of hydrodislocated part of the liquid must be pumped out for unloading of coal seam in the zone of hydrodissection. Part of the liquid remains in the ilast, increasing the moisture content of the coal and blocking partially methane in the holes. The released methane, moving through the formation of cracks to the well, is pumped out of it to the surface or iodine is released by its own excess pressure. Due to the violation of the structure of the elast, its unloading and wetting, and the eradication of the formation is eliminated.

After the hydrodissection of the reservoir is carried out in an insituted orchestration, the hydraulic fracturing of the plates 6, then 5 and 3, is activated.

Subject invention

A method of combating sudden emissions of hydraulic dissection through a well drilled on the surface, characterized in that, in order to increase the efficiency of hydraulic dissection of the croutonayushi suite, their formations, the formation suite intersects with a directed well across the same horizontal plane.