SU1439264A1 - Method of by-interval hydraulic treatment of coal-rock mass - Google Patents

Description

The invention relates to the mining industry and can be used in the hydrotreatment of coal mass through wells drilled from the surface to create safe and comfortable working conditions for miners.

The purpose of the invention is to increase the efficiency of interval processing of the coal-bearing massif by reducing the labor intensity of creating a hydraulic connection between the processing intervals.

Figure 1 shows the injection period 15 of the working fluid through a well with a horizontal end of the barrel in the coal and rock mass in a known manner; figure 2 - pumping the working fluid and extracting gas from the coal-rock mass of it through a well with a horizontal end of the barrel in a known manner; FIG. 3 shows the process of injection of working fluid through a well with horizontal completion of the barrel in the proposed method, i.e. followed by additional perforation of the casing and without removing the decoupling isolation bridges; Fig. 4 illustrates the process of pumping out a working fluid and extracting gas through the same squaline, as well as the paths of their movement along the proposed method.

The method is carried out as follows.

The well J is drilled from the surface to the last processing interval of the coal / rock massif. A well is installed in the well 1 from casing 2, it is cemented and the casing is perforated (the formation of perforations 3) in the first hydrotreatment interval of the coal mass from the bottom of the well 1 and the calculated volume of working fluid is injected. After injection of the working fluid. In the coal and rock massif they isolate the processed interval with an uncoupling bridge 4, an opening (the formation of perforations 3) is carried out in the second hydroprocessing interval and the calculated volume of working fluid is pumped into it. An uncoupling bridge 4 is installed at a section of a well 3-5 m from the perforations 3, through which the working fluid is pumped, since according to known data under hydrodynamic effects

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The zone of maximum destruction of the coal-bearing gas is up to 10 m or more from the place of introduction of the working fluid. After injection into the second interval of the calculated volume of the working fluid, additional perforations are carried out, in the interval of maximum destruction of the near-well zone before installed separating bridge 4 from the side of the wellhead 1 on the site of the well up to 10 m from the perforations 3 ,. through which the working fluid is pumped into the previous interval of the coal and rock mass. Then, the second processing interval is insulated with the separation bridge 4 and the above operations are carried out in the described order in the next interval.

Thus, all intervals are hydrotreated.

After complete hydrotreatment, a hydraulic connection is created between all intervals and pumping of the working fluid and gas from the treated coal and rock mass. Since pumping of the working fluid and gas is possible only if there is a hydroconductive channel, in a known method (Figures 1 and 2) the wellbore is completely free from separation of bridges 4 due to drilling and acid treatment of the latter, which is associated with high labor intensity.

In the proposed method, the separating bridges 4 installed in the well are not removed. The working fluid and gas flows into the chambers A, B and C inside the tube space (FIGS. 4) through the wellbore space and perforations 5. The working fluid and gas are pumped out of chamber B of the last interval. Since the pumped working fluid and gas in the coal-mass massif are under pressure, they, when pumped out, tend to fill the released volume of chamber B with the flow from chambers B and A.

All operations for performing the method are carried out by well-known technical means.

Example. In the field of a mine, a well is drilled with a horizontal end of the barrel, through which it is necessary to conduct interval hydrotreatment of the coal and rock mass in order to reduce

gas and emissions. A borehole with a length of 1800 m is drilled with a diameter of 215 mm and fixed with steel pipes with a diameter of 146 mm (internal diameter 124 mm). The hydrotreatment interval should be carried out in a horizontal section of the well, the length of which is 480 m. In total, eight intervals should be processed every 60 m in length, starting from the bottom of the well. Initially, in the first interval, cumulative perforation of the casing is carried out using a perforator and 10,000 m of water are pumped into the coal and rock mass using pumping units at a bottom-hole pressure of 35 MPa and a rate of m / s. as a separating bridge, an explosive packer with a dpinoi of about 1 m. The packer is designed to separate the treated interval from the untreated one. Then, the casing is perforated in the second hydroprocessing interval at a distance of 60 m from the perforation of the first interval, and the working fluid is injected with the above parameters. After hydroprocessing is completed, in the second interval, the casing is perforated 1-2 m ahead of the packer installed in the first interval. Next, a packer is installed in the second interval. Ae hydrotreatment and an autopsy is performed, the working fluid is injected into the third hydrotreating interval and the processes described further. According to this technology, hydrotreatment is carried out in all intervals. After its completion, the submersible pump is lowered to the depth at which the last packer is installed, and the working fluid is pumped out and the pelvis is removed.

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Claims (1)

METHOD FOR INTERVAL HYDRO-TREATMENT OF CARBON-OIL MASS, including drilling a well from the surface, securing it with casing pipes, perforating the casing pipes in each interval of the hydroprocessing, pumping the working fluid in each interval from the bottom of the well, isolating each previously processed interval from the unprocessed bridge treated intervals and pumping from the treated carbonaceous massif of the working fluid and gas, characterized in that, in order to increase ugleporodnogo hydroprocessing efficiency-wise array by reducing the complexity of creating a hydraulic connection between the treated intervals, before installing each subsequent uncoupling bridge slot hydrotreatment in each preceding interval "shaft casing 55 is further perforated bridge before its uncoupling from the wellhead. SU „„ 1439264