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Method and processor for in-situ conversion between same well sections of coal seam horizontal well

A technology for horizontal wells and coal seams, which is applied in coal gasification, wellbore/well components, earth-moving drilling, etc., can solve the problems of low development efficiency and large number of development wells, save development costs, prolong heating time, and increase the number of Effect

Pending Publication Date: 2021-11-19
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing underground coal gasification mining technology, the number of development wells involved is large, and the development efficiency is low

Method used

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  • Method and processor for in-situ conversion between same well sections of coal seam horizontal well
  • Method and processor for in-situ conversion between same well sections of coal seam horizontal well
  • Method and processor for in-situ conversion between same well sections of coal seam horizontal well

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Embodiment Construction

[0056] The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the embodiments of the present invention, and are not intended to limit the embodiments of the present invention.

[0057] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the implementation of the present application, the directional indications are only used to explain the position in a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0058] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second" and so on are only for descriptive p...

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Abstract

The invention relates to a coal mining technology, and discloses a method and a processor for in-situ conversion between same well sections of a coal seam horizontal well. An oil pipe is arranged in the horizontal well. The method comprises the following steps of: performing staged fracturing on a horizontal well shaft to form a plurality of fracturing cracks perpendicular to the horizontal well shaft, and perforating at each corresponding crack on the oil pipe, wherein the cracks comprise production cracks and injection cracks, the distance between each production crack and a well mouth is smaller than the distance between each injection crack and the well mouth, and the length of each production crack is greater than the length of each injection crack; mounting separation devices at two corresponding production cracks on the oil pipe; heating coal seams corresponding to the production cracks through thermal resistors and / or electromagnetic induction coils; injecting biological liquid into the injection cracks through flow guide pipes in the separation devices; moving the dissolution direction of the biological liquid from the injection cracks to the production cracks, and decomposing a non-pyrolyzed coal seam area by the biological liquid; and enabling gas to enter the oil pipe from perforations at the production cracks and then be produced. Therefore, the number of development wells is reduced, and the development efficiency is improved.

Description

technical field [0001] The invention relates to coal mining technology, in particular to a method and a processor for in-situ transformation between the same well section of a coal seam horizontal well. Background technique [0002] Underground coal gasification (Underground Coal Gasification, referred to as UCG) technology is a coal mining method that controls the chemical reaction of the coal seam and then extracts the chemical composition of the raw coal, that is, the controlled combustion of coal underground, through the thermal and chemical effects of coal A process that produces flammable gases. Its essence is to extract the energy-containing components in the coal seam, and leave pollutants such as ash and slag underground. The in-situ coal gasification technology is carried out in the gasification channel in the coal seam. According to the different gasification channels, the in-situ coal gasification technology can be divided into well-type gasification and well-fr...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/11E21B43/295E21B43/285
CPCE21B43/26E21B43/11E21B43/295E21B43/285
Inventor 于海洋许永彬韩晓冰汪洋程时清
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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