SU1456585A1 - Method of plugging rock with nonuniform jointing - Google Patents

Abstract

The invention relates to making workings in watered rocks with non-uniform fracture by the method of preliminary cementation of rocks. In order to increase the efficiency of the process, cement is produced through two series of wells. The second series of wells is drilled between the wells of the first series after injection of the cement slurry into them. Before injecting the cement slurry into the second series of wells, thin cracks in the rock are expanded through them by injecting water under a pressure of 18-25 MPa. After that, without decreasing the pressure, they switch to the injection of cement mortar. and C /)

Description

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The invention relates to the mining industry, in particular, the carrying out of workings in watered rocks with heterogeneous fracture, i, and in particular to methods of their preliminary cementation for the purpose of water sub-haul.

The aim of the invention is to increase the efficiency of the method by injecting cement mortar into the fractures.

The method is carried out as follows.

From the bottom, for example, a vertical wellbore, the wells of the first series are alternately drilled and cemented using conventional technology. The number of wells, the distance between them, the final pressure or injection, the concentration of the cement slurry and other parameters of the cementing are determined on the basis of known techniques, depending on the hydrogeological characteristics of the rock mass and the required size of the cement curtain. After the cementation of rocks is completed, alternate drilling and cementation of additional wells is carried out alternately between the wells of the first series for the plugging of thin webs with their prior expansion. To this end, before injecting cement mortar into the well, water is injected until a pressure of 18–25 MLa (for example, 22 MPa) is reached and, in a continuous injection, the injection pressure is maintained constant (equal to 22 MPa). At the moment when water is

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the supply tank will begin to run out (water from the supply tank can be partially slitstied), low-concentrated cement solution with high permeability is poured into it (for example, with a cement mass ratio of 1: 6), and, without decreasing pressure, will switch from water injection for the injection of cement mortar, the injection is carried out with a constant pressure of 22 MPa until a solution is lost in absorption of the solution by the well F o.

Spamping of rocks with non-uniform fracturing, including

drilling wells and injecting cement mortar in them, drilling additional wells and injecting in them a solution for filling thin TpenuiH, different Tev- that, in order to increase the efficiency of the method, thin cracks are expanded by supplying water to them to increase the efficiency of the method | D pressure 18-25 Mlla, and the cement slurry is injected into the expanded cracks immediately after the water supply under pressure equal to the water supply pressure.

Claims (1)

The claims "1,> · ---- A method of plugging rocks with 15 heterogeneous fractures, including 10 drilling wells and injecting cement in them, drilling additional wells and injecting a solution into them to fill thin cracks, characterized in that, with In order to increase the efficiency of the method, before the injection of the cement mortar, thin cracks are expanded by supplying water to them under a pressure of 18-25 MPa, and the cement mortar is injected into the expanded cracks immediately after the water supply under the pressure equal to The pressure of water supply.