SU1346797A1 - Method of hydraulic excavation of materials from underground formations - Google Patents

Abstract

The invention relates to mining and geology and m. used in downhole hydraulic mining and in the testing of productive horizons. The purpose of the invention is to increase the extraction efficiency by protecting the chamber from the collapse of rocks. The method of hydraulic extraction of materials from subterranean formations is carried out as follows. The subterranean formation is opened by a well and a hydrojetting unit with a hydraulic-lift lift is placed in it. Under the roof by circular erosion of rocks work the top layer. Foaming plastics (foam, etc.) are injected into the space. After the strength of the latter is cut, the plastic block is cut off from the array of the underlying layer by cutting through the disc-shaped slit in the specified block with filling the slit with liquid. Then, the formation rocks are eroded in layers in descending order with pulp discharged to the surface. The liquid level in the chamber formed during the washout process is constantly maintained above the lower boundary of the block. A block of foam has a high buoyancy and, at the indicated water level, floats in the chamber, which dramatically increases its supporting capacity. 2 Il. (L SAE. 4 Oi WITH

Description

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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 aim of the invention is to improve the extraction efficiency by protecting the chamber from rock caving.

Figure 1 presents the scheme of trimming the block; figure 2 - scheme of testing the camera under the protection of the unit.

The formation is opened by a well 1, in which a well-boring jetting unit 2 is placed with a hydro-elevator lift; Under the roof, the upper layer is processed by circular erosion of the rocks. At the same time, after the upper layer of the roof rock has been developed, temporary resistance is maintained due to the short erosion time. Immediately after dispensing, the rock mass is pumped onto the surface with known injectors into the developed space of the upper layer of expandable plastic, which can be used as polyurethane foam, foam plastic, etc. After the plastic has hardened, block 3 is formed last. Following this, the downhole jetting unit 2 is buried in block 3 and the latter is cut off from the underlying array by slotting a disk-shaped slit 4 in the specified block with filling the slit 4 with liquid. The slotting slit 4 in block 3 is necessary for the following reasons. Foaming plastic is destroyed by the jet much faster and more efficiently and more evenly than the rock. When this slot is washed out in the block with its filling with liquid, there is no abrupt redistribution of pressure in block 3 under the effect of the roof rocks, since the cutting time is very short.

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After the block 3 is cut off, the formation rocks are eroded in a descending order of layers 5 with pulp discharged to the surface. In this case, the level of liquid in the chamber is constantly maintained during the washout process above the lower boundary of block 3. The block is a porous structure with positive buoyancy, and with the indicated maintenance of the level of fluid in the chamber, block 3 floats in the chamber, which is sharply increases its supporting capacity. By virtue of the same porous structure, the blows from roofing pieces falling onto the block of roofs are quenched, which reduces the likelihood of its critical deformation.

Claims (1)

Invention Formula A method of hydraulic extraction of materials from subterranean formations, including opening the formation with a well, placing a downhole jetting assembly therein, washing the reservoir from top to bottom to form a extraction chamber, dispensing pulp to the surface and injecting a hardening mixture into the developed space, characterized in that the purpose of increasing the efficiency of extraction due to the protection of the chamber from the collapse of rocks, initially erode the upper layer of the reservoir, is injected into the developed space After expanding the last plastic, the plastic block is cut off from the array of the underlying layer by cutting a disc-shaped slit in the specified block with filling the slit with liquid, and the underlying layers are protected by the plastic block, while the liquid level in the chamber is constantly supported above the lower boundary of the block . -G Phys .2