SU1293350A1 - Method of hydraulic recovery of materials from underground formations - Google Patents

Abstract

The invention relates to the field of mining and geology, and can be used in downhole hydraulic mining. The goal is to increase the effectiveness of rock erosion by increasing the disintegrating effect of the gas-liquid jet, simplifying the pulping column and providing operational control over the volume of the eroded chamber. The subterranean formation is exposed to the production and production wells 1 and 2 in its production well 1. The well monitor 3 is placed in the production well 1. In the far borehole 2, at the level of the upper boundary of the productive horizon, a sand plug 5 is placed on which the pulp production column 4 is installed. Then, in the direction from erhu advanced down with sinking of the trench between the holes within each layer is carried out erosion of rocks. Simultaneous erosion of the sand plug 5 produces its lowering under the action of its own weight to the level of the soil of the trench. The scour is produced by a gas-liquid jet. Air accumulates in the volume of the formed chamber 6 of the first layer and gradually displaces the air-pulp section below the action of the jetting jet. By creating pressure in the chamber 6, the pulp enters the suction of the column 4 and is delivered to the surface. 1 il. c (O (LU SAD CO sd

Description

The invention relates to mining and geology and can be used in the well of hydro-mining of mineral resources, as well as in well testing of productive horizons.

The aim of the invention is to increase the effectiveness of erosion of rocks by increasing the disintegrating effect of the gas-liquid jet, simplifying the manipulation of the pulp-collecting column and ensuring operative control over the volume of the eroded chamber.

The invention is illustrated in the drawing, which is a diagram illustrating the steps of the method.

The method is illustrated by the example of testing the powerful underground fordin. The indicated formadiya, before its soil, opens the mining 1 and the discharging 2 wells. In the production well 1, a well jet generator 3 is placed, and the output well 2 is filled with sand to the upper boundary of the productive horizon and the pulp production tower 4 is installed on the sand plug 5) formed in the well 2.

After that, the formation rocks are eroded by layers in the direction from the roof of the formation to its soil. At. This is due to the fact that the wellhead is sealed and erosion is produced

the gas-liquid jet, in the volume of the chamber formed by the sixth-first layer, air accumulates and gradually pushes the air-pulp section back below the level of the action of the jetting jet. Excess air can be diverted to the mouth of any of the wells through the diverter channel preventer. By creating pressure in the chamber 6, the pulp enters the suction of the column 4 and is delivered to the surface.

After erosion of the upper layer with a slow descent of the jetting unit 3, a trench is eroded between wells 1 and 2 within the underlying layer. Simultaneously with the said trench, the sand plug under the pulping column 4 is washed away to ensure a new level of sump soil specified trench.

The need to preliminarily conduct well 2 and fill it with sand is due to the fact that if there are boulders in the rocks, there will be no

If a string 4 preliminarily traversed and filled with sand, the string 4 could rest on a boulder and its further downward movement would be possible.

As the layers are washed out and it is necessary to measure the volume of the chamber formed in the chamber, the air pressure is released, the well monitor 3 is removed from well 1 and a special downhole television installation is placed in the latter, which allows determining the distance to the chamber walls by the developed technique. When the pressure is released, the increase in the level of pulp in the chamber is insignificant, since pulp from chamber 4 only enters chamber 6,

According to the described sequence of operations, the formation is tested at full capacity, and the air-slurry section in chamber 6 is constantly maintained below the level of the action of the jetting jet. The nature of the jet operation is determined using a special acoustic sensor that makes it possible to detect: either the jet is working in the non-submerged bottom, or the erosion is produced by the submerged jet. In the event that the erosion is carried out by a submerged jet, the discharge of air from the preventer is stopped to a corresponding decrease in the level of the air-pulp section in chamber 6.

Claims (1)

Invention Formula The method of hydraulic extraction of materials from subterranean formations, including the opening of the formation to its soil from the production and output wells, with the placement of a downhole jetting machine and a lifting column, respectively, dumping of the formation rocks and hydraulic washing of the formation with layers of pulp onto the surface, o suspecting that The goal is to increase the erosion efficiency of rocks by increasing the disintegrating effect of the gas-liquid jet, simplify the manipulation of the pulp production column, and ensure operational control over the volume of the chamber to be diluted, before erosion of the rocks at the level of the upper boundary of the productive horizon in the discharging well, create a sand plug, the mouth 12933504 Pulping and simultaneous washing out of the dacha dacha column is poured with support on it, the rocks being washed out, the plugs under the sludge column are laid downwards downwards and the latter is lowered under the leading trench between. the action of its own weight to the level of the wells within each layer of the soil of the said trench.