SU1352061A1 - Method of recovering materials from underground formations - Google Patents

Abstract

The invention relates to the field of mining and geology and m. used in downhole hydraulic mining and in the testing of productive horizons. The goal is to increase the extraction efficiency by improving the conditions for the erosion and hydraulic lift of the rocks while ensuring a stable roof condition. For exercise. According to the method, the subterranean formation is opened by at least two wells (c), which are drilled into hard rock to a depth equal to the height of the extraction interval. In C 1 place the casing (OK) 4, and in the heat bar place OK 3 with cementation of the annulus. In С 2, OK 5 is placed from the wall to the surface and cement the annular space. Then the cement plugs are drilled, buried, for example, at 1 m C 1. and 2, and they fail (L

Description

OK 3, 5 is installed at the ends. After fitting, a hydraulic assembly is installed in С 1, which is a slurry tower 6 with a hydraulic elevator 7, a hydraulic monitor 8 and a shank 9 located in OK 3. Then, water is supplied to OK 5 OK 5 in connection, further in OK 3, tail 1

The invention relates to mining and geology and can be used in downhole hydraulic mining of minerals, as well as in testing productive horizons.

The purpose of the invention is to increase the efficiency of extraction due to improved conditions for hydraulic erosion and hydraulic lift of rocks while ensuring a stable condition of roofing.

The drawing shows a diagram explaining the method.

The method is as follows.

The subterranean formation is opened by at least two wells 1 and 2, and the wells are drilled into hard rock to a depth equal to the height of the extraction interval. In the production well 1, the overproduction is placed. casing 3 with cementation of the burial space. In well 1, a casing 4 is placed in the roof of the formation, also with cementation of the tubular space. In production well 2, a column 5 is placed from the indent to the surface and the annulus is cemented to the surface.

Then cement plugs are drilled, buried, for example, on 1 m of borehole 1 and 2, and squeezed them out. Combining can be performed using hydraulic perforators or using cumulative charges of explosive.

After the wells are connected in the first well 1, a hydromonitor unit is installed, which is a piston lift column 6 with hydraulic elevator 7 and hydraulic monitor 8, as well as with a shank 9, which is connected to hydraulic elevator nozzles 7 and hydraulic hydraulic valve 1352061

and the residual valve 9 and the nozzles of the hydraulic elevator 7 and the jetting unit 8. The jetting jets erode chamber 11. Water 10 escapes into the chamber from OK 3. Blurred highland mass enters the hydraulic elevator 7 and further along the pulp-lifting column 6 to the surface. 1 il.

nitro 8, while in the lower end of the shank 9 there is an opening for introducing fluid into the shank and further into the indicated nozzles. The tail 9 times 5 is placed in the column not 3 in such a way that the packer 10 interacts with the walls of the column and is located at its upper end, i.e. at the lower end of the extraction interval. With this

In position the nozzle of the monitor 8 should be under the upper limit of the extraction.

Then through the column 5 in the well 2, water is fed under pressure

 passes through this column, goes into the collation, then into column 3 and into the shank 9 ,. and from the shank, water is directed to the nozzles of the hydraulic elevator 7 and the hydraulic monitor 8. When the aggregate 2Q is rotated with the help of the hydraulic jet, the chamber 11 is washed out, while the packer 10 prevents the water from entering the chamber from the column 3. The fumed mass passes through the receiving chamber into the hydraulic elevator 7 and further along the pulp-raising column 6 to the surface. As the chamber is washed out, the shank 9 together with the whole aggregate is buried in column 3, and the level of action of the jetting jet is lowered. To ensure erosion of rocks over the entire height of the extraction interval, the length of the column 3 must be equal to the height of the extraction interval.

 35 When the rocks are washed out, column 5, cemented with Bbmie and below the extraction interval, functions as an element supporting the roof of the excavation chamber. With very unstable

40 formations can be run through several production wells, which also serve to supply pressure 25

thirty

working agent. Due to this, it is possible to develop underground formations with unstable roofs with a high height

Claims (1)

The Invention Formulation Method subterranean formations, including open-jq inclusions; drilling down the wells formations of at least two wells with overburden in resistant soil rocks, installation of a jetting unit in a production well, and a casing string with cementation of the annulus space in the production well, formation formation erosion with formation of a excavation chamber and pulp molding to the surface, characterized in that, in order to increase the efficiency of extraction, and at the expense of improved The conditions of hydraulic erosion and hydraulic elevation of rocks while ensuring a stable condition of the roof, re-drilling of wells make the extraction interval equal in length, casing strings are installed in the production well in the over-run and the roof of the formation. by cementation of their annulus just over the bore under the ends of the columns, the rocks become thicker with the formation of a cylindrical chamber and its bottom inclined to the suction of the jetting unit by forcing a pressurized working agent on its nozzle through the production well, coupling, column in the rebar of the production well and shank, The cavities of the excavation chamber and the casing string are split apart by installing a packer on the shank within this column.