SU59477A1 - The method of underground gasification of solid fuels - Google Patents

Description

The invention relates to the method of gasification of combustible gas by means of the method of flow with the opening of the reservoir by boreholes arranged in parallel rows or; in a staggered manner and with the assembly of bottom holes in the formation.

In accordance with the present invention, it is proposed, during the gasification of inclined formations, to ignite the panel through the lower row of downhole wells located along the strike of the formation, and the wells of the overlying rows to enter into the gasification as the firing hole approaches them.

During gasification of horizontal and gently dipping layers, it is proposed to blow and discharge gasification products: to produce through wells located at opposite corners of a square or polygon with gasification of the rear sight, circumcised well, along a convex or concave contour.

The proposed method requires a minimum of preparatory work, since a significant part of the latter is produced during the technological process of gasification itself and makes it possible to avoid the use of inclined casing in coal

reservoir, the use of which causes great difficulties in the implementation of the flow method.

FIG. 1 shows a plan of the gasified area, near to the deposit, by inclined strata; in fig. 2 shows a section along AB of FIG. one; in fig. 3 - site plan for the field with horizontal or gently dipping layers.

In the section intended for underground gasification, vertical wells 1, 2, 3, 4, 5 are drilled from the surface of the earth into the coal bed, along the strike of the coal seam at a distance (a) from each other. This distance is determined from the conditions for producing gas of the desired quality. At some distance from the first row of wells, upward along the reservoir uprising is located in a staggered pore: the second row of vertical wells b, 7, 8, 9, 10, then the third row of wells M, 12, 13, 14, 15 and t . e. All wells to the reservoir level are cased from the inside with pipes (of metal, ceramic or other material). The vertical wells of the first row, 1, 2, 3, 4, 5, are knocked together along the strike of the coal seam by hydraulic or other means. In case the distance (a) exceeds the distance that can be traveled from the surface with a hydraulic interruption or some other well-killing method (oxygen or electric ignition, etc.), IB will drill the first row of intermediate wells that can to be used for the ignition of the coal seam.

Ignition of the formation is performed by IB horizontal workings, obtained by joining the wells of the first row in order to extend the formation. If blast is supplied to wells 2, 4, then gasification products are diverted through wells 1, 3, 5; when reversing wells 1, 3, 5 serve to supply a blow, and wells 2, 4 - to divert gasification products. As the reservoir evacuates and reaches the firing domes between the wells of the first row of wellheads, lying higher up the second row uprising, the wells of the first row are turned off, and the wells of the second row are turned into for the supply of blowing and exhaust gas. The inclusion of one or another borehole can be made gradually, depending on the course of formation of the reservoir between the individual wells.

The number of wells in the horizontal row can be as large as desired depending on the length of the section of the coal seam intended for gasification along its strike. In order to enable the same number of wells in each row to be used, an additional failure of the two extreme wells between adjacent rows (for example, 1st and 6th, 10th and 15th, etc.) is required.

At the same time, exhausting the coal bed between wells will be entirely due to the absence of the need to leave the interpanel pillars of coal, as is the case with the continuous method.

During the gasification of horizontal formations in the section intended for underground gasification, a number of vertical wells are drilled from the surface of the earth into the coal formation on the sides of the square.

(Fig. 2). All wells are knocked together by hydraulic or some other method. When vygazovyvaniya rectangular section 1, 5, 7, 3 blast is fed into the well 6, and ignition is performed through wells 2, 5, 7. The selection of gasification products is done through wells 1, 3. When vygazovyvaniya section 5, 9, 11, 7 selection gasification products are produced, respectively, through wells 9 and 11, and ignition through wells 5, 7, 10. It is possible to simultaneously gasify the entire section 1, 9, and 3. The gas flow is directed from well 6 to the gas outlet,, to them by wells broken lines formed by the sides of the squares. As coal is exhausted, gases will tend to strand their way, washing the surface of the hot end of its angle, located inside the square (the character of coal exhausting is shown in Fig. 2 by dotted lines).

When the gasification of the coal pillar in one square or another is completed, the gas flow will take in the limit the direction along the diagonal of the square (for example, from well 6 to well 1 or 3).

The progress of the gasification process can be controlled by the amount of gasification products taken from one or another well and reversing. As heat treatment of the coal seam occurs, at the row with the washing of the coal by gas flow, the gas will penetrate through the cracks formed in the pillars of the coal, as well as through the pores of the coal as its volatiles are stripped off.

The subject matter of the invention.

Claims (2)

1. The method of underground gasification of solid combustible minerals, with formation opening located in parallel rows or in staggered boreholes and application of the bottom faces of the latter along the formation, characterized in that for gasification of inclined formations the panel ignition is conducted through the lower row located along the formation downed wells 1-5, and the wells of the overlying rows are introduced into gasification as you approach the fire slag. 2. Acceptance of the method according to claim 1, characterized in that, for gasification of horizontal and gently dipping formations, the flow is blown and the outlet of gasification products is produced through wells located at opposite corners of a square or polygon. Fig1 / . "-" / 4 15 о о о о л at 7 b 9 10 // Fng.Z