SU60291A1 - The method of underground gasification of combustible with the opening of the gasified reservoir boreholes - Google Patents

Description

The described method of underground gasification consists in the fact that gasification is carried out between two vertical wells passed from the surface to the extent that this is possible, and at this time, due to filtration, the next pair of wells is being prepared.

A number of wells located in parallel rows are drilled from the surface to the base of the gasifying reservoir. A pair of wells 1, 1 is knocked down in coal by any mine or shaftless method (Fig. 1).

The wells are lined with pipes and provided with communication, providing supply of blowing and discharge, gas through any of them, supply of steam or nitrogen for reversing and, if necessary, supply of water for cooling gas in the well.

After a couple of downhole wells 1, 1, the panel is ignited and the gasification process begins. As the coal burns out, the fire face is becoming more and more lengthened and, crooked, approaches the second pair of wells (Figs. 2 and 3). To accelerate the introduction of the latter into the gasification process, with the start of operation of the first pair of wells, it is reported first with the atmosphere, and then with the gas outlet line. At the same time, due to the filtration, the gas begins to gradually flow through the coal into these open wells. The pillars between the borehole and the fire face become more and more gas-permeable, small cracks in the coal begin to grow, and at the KOHrie ends there is a squeeze of these squalls: fire holes (Fig. 3).

When this happens, the wells 2, 2 are closed and kept in reserve until the work through the first pair of wells becomes unprofitable. Then the squall 2, 2 is introduced into gasification, and the wells 3, 3 communicate with the atmosphere (4) cg. 4-g). In this way, including the succession of new and new wells, it is possible to vygazovat any coal field.

The well switching time is determined based on calculations. to(); vygazovannogo coal or according to the determination of the position of the firing slab any method.

The distance between the two wells of each pair, which determines the length of the firing slab, will be the same as in the normal flow method, i.e., on the order of 00 g.

The distance between each pair of wells depends on the permeability of the reservoir and the flow conditions to blow and in each case must be determined by an experienced order.

Thus, the proposed method uses the positive aspects of the filtering method, i.e., the possibility of maintenance-free process, and the positive aspects of the in-line method, the ordering of the formation gas.

Subject invention

The method of underground gasification of combustible with the opening of a gasified reservoir by boreholes, consistently used to supply blowing or venting gas after sinking their bottoms, characterized in that, in order to implement the latter by filtering blow through the formation during the gasification process, the next wells before switching on The process is reported first with the atmosphere, and then with the venting line.

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