GAS INJECTION APPARATUS WITH CONTROLLABLE GAS INJECTION POINT GAS INJECTION PROCESS AND GASIFICATION METHOD

摘要

A gas injection apparatus with a controllable gas injection point a gas injection process and a gasification method. The gas injection apparatus comprises a directional well channel (6) where a continuous oil pipe (3) is provided in the directional well channel (6). The continuous oil pipe (3) is connected to an oxygen/oxygen rich gas pipeline. An annular gap between the continuous oil pipe (3) and the directional well channel (6) is connected to an auxiliary gasification agent pipeline and a vapor pipeline. A gas injection wellhead (2) is provided at the start end of the continuous oil pipe (3) and a nozzle (4) is provided at the tail end. In the present invention based on directional drilling and continuous oil pipe technologies the movement of a gas injection point is implemented by using a manner of combining directional drilling and a continuous oil pipe; meanwhile by using a principle of controlling reverse combustion by adjusting a gasification agent injection parameter the movement of a working surface position and a combustion speed of a flame are regulated so as to achieve the objectives of ignition and gasification for reverse combustion of an underground coal layer.