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Gas injection apparatus with controllable gas injection point, gas injection process, and gasification method

Inactive Publication Date: 2016-05-05
ENN COAL GASIFICATION MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a new method for igniting and gasifying coal underground using a shaftless system. This method improves gasification control and safety performance while reducing production costs. The invention also includes a gas injection apparatus and process that allow for controllable gas injection points.

Problems solved by technology

Its disadvantage lies in that position of burning zone is not stable, loss rate of the gas is high, and it is necessary to add auxiliary boreholes if the gasification channel is very long.
The advantage of CRIP technology is that the gasification process can be effectively controlled, while its disadvantage is that this technology requires multiple ignitions to ignite the coal seam at different distance location within a directional well before gasification.
Because the gas injection point movement is discontinuous, the gasification is unstable, and the apparatus for ignition and gas injection has complicated structure and is expensive, the ignition process is complicated, difficult to control and not safe enough.

Method used

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  • Gas injection apparatus with controllable gas injection point, gas injection process, and gasification method
  • Gas injection apparatus with controllable gas injection point, gas injection process, and gasification method
  • Gas injection apparatus with controllable gas injection point, gas injection process, and gasification method

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Experimental program
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Effect test

embodiment 1

[0063]Gas injection apparatus with controllable gas injection point comprises directional well channel 6, the directional well channel 6 is disposed with coiled tubing 3. The coiled tubing 3 is connected with oxygen / oxygen-enriched gas line. The annular space between the coiled tubing 3 and the directional well 6 has connection to the auxiliary gasification agent line and steam line. The start end of the coiled tubing 3 is disposed with gas injection well head 2 and the terminal end is disposed with nozzle 4.

[0064]Coiled tubing reel 1 is used for carrying the coiled tubing 3.

embodiment 2

[0065]A gas injection technology with controllable gas injection point, wherein oxygen / oxygen-enriched gas is delivered by the coiled tubing deposited within the directional well channel; the oxgen / oxygen-enriched gas and the auxiliary gasification agent delivered through the annular space between the coiled tubing and the directional well wall are uniformly mixed at the nozzle at the terminal end of coiled tubing; the mixed gasification agent enters the predetermined gasification position of the coal seam through the directional well channel or the pore channel within the coal seam.

[0066]The directional well channel is formed by the directional drilling method. The directional drilling method preferably employ any of directional well drilling technology, horizontal well drilling technology, lateral drilling technology, radial horizontal well technology, multilateral well technology, cluster wells technology and extended reach well technology in petroleum or coal seam gas drilling t...

embodiment 3

[0071]A controllable gas injection point gasification method, wherein reverse burning, gasification channel process and gasification production is conducted by segmentally moving the coiled tubing to make the gas injection point segmentally move to the predetermined gasification position, and then adjusting the gas injection technology parameters.

[0072]The gasification method comprises the following steps:

[0073]1) according to the parameters such as thickness and reserves of gasifiable coal seam in gasification area, segmentally moving coiled tubing according to the gas injection process to make the gas injection point position segmentally move to the predetermined gasification position;

[0074]2) adjusting the pressure and flow rate of a single gas and controlling the parameters such as flow rate, pressure and oxygen concentration of the injected gasification agent; segmentally moving the flame working face to the predetermined gasification position in the manner of reverse burning a...

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Abstract

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, where a continuous oil pipe is provided in the directional well channel. The continuous oil pipe is connected to an oxygen / oxygen-rich gas pipeline. An annular gap between the continuous oil pipe and the directional well channel is connected to an auxiliary gasification agent pipeline and a vapor pipeline. A gas injection wellhead is provided at the start end of the continuous oil pipe, and a nozzle 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 objective of ignition and gasification for reverse combustion of an underground coal layer.

Description

TECHNICAL FIELD[0001]The present invention relates to the technical field of coal resource development, particularly relates to a gas injection apparatus with controllable gas injection point, gas injection process and gasification method.BACKGROUND ART[0002]Shaftless underground gasification technologies mainly employ the directional drilling and reverse burning to construct gasification channel, and inject gasification agents such as air and oxygen / steam to conduct underground gasification to produce coal gas. Its advantage lies in that gas production of single gasifier is large. Its disadvantage lies in that position of burning zone is not stable, loss rate of the gas is high, and it is necessary to add auxiliary boreholes if the gasification channel is very long.[0003]To solve the problems above, Lawrence Livermore national laboratory in USA has developed controlled retraction injection point (CRIP), which makes the injection point retract to form new burning zone by burning a s...

Claims

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Application Information

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IPC IPC(8): E21B43/295E21B7/04E21B7/06
CPCE21B43/295E21B7/046E21B7/06E21B43/243E21B43/305
Inventor LIU, GANGCHEN, FENG
Owner ENN COAL GASIFICATION MINING