SU1444518A1 - Method of sinking a technological well in mine working influence zone - Google Patents

Abstract

The invention relates to the mining industry and m. used in drilling with a hydraulic system for removing rock from the bottom of a well located in the zone of influence of mine workings. The goal is to reduce the cost of conducting a well. increasing the efficiency of her hunter, 1980, p. All-Union wounds and reduction of mineral reserves loss in safety pillars. For this, the width of the zone of the maximum stress state of the massif is preliminarily determined around the mountain ridge. Outside this zone, a well is drilled (C). During the drilling process, the barrel is maintained with the flushing solution, a jig, intermediate casing strings, main casing string are installed, and the annulus is plugged. After the fastening solution hardens in the cracks, they are drilled to the depth of penetration of the fastening solution. Drilling C is carried out in steps. On the first i; steps dr C to the border of the zone of intense fracturing (ZIT). Then the consistency of the washing solution is changed and a fastening solution is injected in face C to plug the cracks. At the second stage, the drill is drilled to the depth of penetration of the bonding solution. Sequential drilling and plugging are carried out until the ZIT zone is crossed. At the same time, the intermediate columns are installed in the zone zone ZIT The main column y: set to overlap overlapped or the lower part of the conductor, or the lower part of the intermediate column. (L SL 00

Description

The invention relates to the mining industry and can be used in drilling with a hydraulic system for removing rock from a well located in the zone of influence of mine workings, such as a coal mine, at a distance from the mine working that is smaller than the width of the design barrier pillar.

The aim of the invention is to reduce the cost of conducting a well, increasing the efficiency of its protection and reducing the loss of mineral reserves in safety pillars.

The method is carried out as follows.

They study the mining and geological, mining and technical conditions and surface conditions in the area of development of mining operations, determine the place where the technical well is being laid. Prior to drilling a well, the number and width of the fracture zone at the contours of occurring flows, the permeability of the washing solution into the wellbore array, taking into account its composition, thickness, depth, lithological composition of the lateral rocks and the state of mine workings and the effectiveness of measures that protect walls wells from blockages, safe mining in the mine and preventing the breakthrough of drilling fluid into existing production.

The width of the maximum stress zone at the encountered mine workings is determined, the axis of the projected technical well, taking into account its curvature, is placed from the mine workings beyond the zone of the maximum stress state - the 1st array. The shear resistance of the rock formations along the breakthrough contour between the mine workings and the technical well is tested against the flow pressure of the flooded well at the depth of the mine workings. The transition diameters of the trunk parts of the designed technical well are determined by the number of predicted areas of intense fracturing , lining construction and dimensions of casing in each part of the barrel. The wellhead is laid, a well is drilled with a calculated diameter under the conductor, it is secured and plugged. . Further, the wellbore continues to be drilled with a smaller diameter until the re-drilling

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Neither the zone of rocks from the influence of the first mine workings. At the same time, drilling is stopped at the upper boundary of the zone of intensive fracturing of rocks (10 m to the level of the roof of the occurrence of high-pressure work), change the consistency of the washing solution in the direction of decreasing filtration into the massif and pumping the bonding solution into the bottom hole of the massif, and after solidification of the solution in the cracks of the massif, drilling continues by steps to the depth of the hardened rocks, i.e. to the depth of penetration of the fastening solution (as indicated by the leakage of the washing solution). The cycle of operations on plugging the rock mass from the bottom of the well and drilling in steps is repeated in the interval of the zone of influence of the mine workings (in the zone of intense fracturing). The barrel is then secured in the zone of influence of the mine workings. An intermediate casing string is produced in the zone of influence of the mine workings or on the entire length of the drilled part of the barrel before the overlap enters the conductor and plugs the annulus with cement mortar.

Further drilling of the well is continued with a smaller diameter until the meeting of the next mountain run or project mark. Over-drilling, fixing and tamping of the zone of influence of the next mine working is carried out in the same way; When the well has reached the design elevation, the main casing string is raised to the level of the last intermediate column with overlap, if the upper part of the barrel is already fixed, or with overlap of the lower part of the conductor, if only the intervals of the well are fixed in the zones of influence of mine workings. The annular space of the main column of pipes is tamped at the level of the aquifers with a cementitious mortar, and between them and in the lining interval, the influence of pliable material, for example, sandy-clayey mortar.

Claims (1)

Invention Formula The method of conducting technical wells in the zones of influence of mine workings, including step drilling of the strata, rocks, maintenance of the wellbore the solution during drilling, installing the conductor and intermediate casing strings after drilling the corresponding steps, installing the main casing string after drilling the well bore to the design elevation and plugging the annulus after installing the casing strings at each step, characterized in that well, improving the efficiency of its protection and reducing the loss of mineral reserves in safety pillars, preliminarily determine the width of the zone individually stressed state of the array around the mine, the well is drilled outside extensive fracturing, then change the consistency of the industrial solution in the direction of reducing its filtration into the massif, forcing the bonding solution into the bottom of the well and plugging the cracks and, after solidifying the bonding solution in the cracks, drill to the depth penetration of the fastening solution, with sequential drilling and plugging of cracks with fastening. the solution is produced before the intersection of the zone of intense fracturing, the intermediate Columns are installed in the interval of zones of intense fracture, and the main casing string is installed to overlap the overlap of the lower part of the conductor or the lower part the specified zone to the border of the zone of the last 20 intermediate column.