Controllable gas injection point gas injection device, gas injection technology and gasification method

Abstract

The invention relates to a controllable gas injection point gas injection device, a gas injection technology and a gasification method. The gas injection device comprises a directional well channel. A continuous oil pipe is arranged in the directional well channel and is communicated with an oxygen / oxygen-enriched gas pipeline; an annular space between the continuous oil pipe and the directional well channel is communicated with an auxiliary gasification agent pipeline and a steam pipeline; and a gas injection well head is arranged at the starting end of the continuous oil pipe, and a nozzle is arranged at the tail end of the continuous oil pipe. On the basis of the directional drilling and continuous oil pipe technology, the directional drilling and continuous oil pipe matched mode is utilized for achieving moving of a gas injection point, and on the principle of adjusting gasification agent injection parameters and controlling reverse combustion at the same time, the aims of adjusting and controlling the position movement and combustion speed of a flame working face and carrying out reverse combustion ignition and gasification of an underground coal seam can be achieved.

Description

technical field [0001] The invention relates to the technical field of coal resource development, in particular to a gas injection device with a controllable gas injection point, a gas injection process and a gasification method. Background technique [0002] Well-less underground coal gasification technology mainly uses directional drilling and reverse combustion technology to build a gasification channel, and then injects gasification agents such as air and oxygen / steam for underground gasification to produce coal gas. Its advantage is that the output of a single furnace is large; the disadvantage is that the position of the gasification combustion zone is unstable, the leakage rate of the gasification agent is high, and the channel is too long to increase the auxiliary air inlet. [0003] In response to the above problems, the Lawrence Livermore National Laboratory of the United States has researched and developed the Controlled Injection Point Retreat Gasification Proces...

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Problems solved by technology

[0005] The purpose of the present invention is to solve a series of problems such as multiple ignitions and complex devices, discontinuous movement of the gas injection point and poor stability of the gasification process in the conventional well-less underground gasification controlled injection point retreat process, and provide a well-free The reverse combustion ignition and gasification method of the controllable gas injection point movement of conventional underground gasification, in order to achieve the purpose of improving the stability control and safety performance of the gasification process, and at the same time reduce the production cost

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