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Combustible ice mining method

An ice layer, one-hole technology, applied in the fields of fluid extraction, drilling equipment and methods, earthwork drilling, etc., can solve the problems of high cost, low extraction efficiency, and great influence of geological structure, so as to reduce drilling cost and achieve high extraction efficiency. , the effect of little influence of geological structure

Pending Publication Date: 2021-12-10
伍丕济
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. There are many difficulties in mining combustible ice. Research in this area has been carried out all over the world, but there has been no good method. The existing mining methods are relatively complicated, costly, lack of controllability and operability, and cannot be put into commercial use. operation;
[0006] 2. When mining the combustible ice layer with a large thickness, there are many problems such as low mining efficiency, high cost, and great impact on the geological structure using conventional mining methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] What this embodiment describes is a method for mining combustible ice, which is characterized in that it includes the following steps:

[0035] Step 1, selecting wells, surveying the thickness of the combustible ice layer, selecting a region where the thickness of the combustible ice layer is greater than 5m as the mining area;

[0036]Step 2, drilling, drilling a first vertical well vertically downward above the mining area to lead to the combustible ice layer, and drilling a first horizontal well in the front, back, left, and right directions of the first vertical well, and drilling a first horizontal well in each first vertical well. Drill a second vertical well downward on the horizontal well, and then drill a second horizontal well in four directions, front, back, left, and right of each second vertical well, and drill wells in sequence according to this rule. Drill an nth horizontal well in the front, back, left, and right directions of the well, and drill a downw...

Embodiment 2

[0040] What this embodiment describes is a method for mining combustible ice, which is characterized in that it includes the following steps:

[0041] Step 1, selecting wells, surveying the thickness of the combustible ice layer, selecting a region where the thickness of the combustible ice layer is greater than 5m as the mining area;

[0042] Step 2, drilling, drilling a first vertical well vertically downward above the mining area to lead to the combustible ice layer, and drilling a first horizontal well in the front, back, left, and right directions of the first vertical well, and drilling a first horizontal well in each first vertical well. Drill a second vertical well downward on the horizontal well, and then drill a second horizontal well in four directions, front, back, left, and right of each second vertical well, and drill wells in sequence according to this rule. Drill an nth horizontal well in the front, back, left, and right directions of the well, and drill a down...

Embodiment 3

[0046] What this embodiment describes is a method for mining combustible ice, which is characterized in that it includes the following steps:

[0047] Step 1, selecting wells, surveying the thickness of the combustible ice layer, selecting a region where the thickness of the combustible ice layer is greater than 5m as the mining area;

[0048] Step 2, drilling, drilling a first vertical well vertically downward above the mining area to lead to the combustible ice layer, and drilling a first horizontal well in the front, back, left, and right directions of the first vertical well, and drilling a first horizontal well in each first vertical well. Drill a second vertical well downward on the horizontal well, and then drill a second horizontal well in four directions, front, back, left, and right of each second vertical well, and drill wells in sequence according to this rule. Drill an nth horizontal well in the front, back, left, and right directions of the well, and drill a down...

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Abstract

The invention discloses a combustible ice mining method, and belongs to the technical field of combustible ice mining. The invention aims to provide a method for exploiting natural gas in a combustible ice layer with larger thickness, and the method is high in exploiting efficiency, low in cost and small in influence on a geologic structure. According to the technical scheme, the combustible ice mining method comprises the following steps of 1, a well selection, specifically, the thickness of the combustible ice layer is surveyed, and an area with the combustible ice layer thickness larger than 5 m is selected as a mining area; 2, well drilling; 3, well cementation; and 4, mining.

Description

technical field [0001] The invention belongs to the technical field of combustible ice mining, and relates to a method for mining combustible ice. Background technique [0002] Combustible ice, also known as "natural gas hydrate", is an ice-like crystalline substance formed by natural gas and water under high-pressure and low-temperature conditions. ” and “Air Ice.” Natural gas hydrates are distributed in deep sea or land permafrost. After burning, only a small amount of carbon dioxide and water are produced. The pollution is far less than coal, oil, etc., and its reserves are huge. Therefore, it is internationally recognized as an alternative energy source for oil. [0003] Natural gas hydrates are widely distributed in the slopes of continents, islands, uplifts of active and passive continental margins, polar continental shelves, and deep-water environments in oceans and some inland lakes. The reserves are hundreds of times larger than the total reserves of oil on the ea...

Claims

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Application Information

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IPC IPC(8): E21B43/30E21B43/295E21B43/24E21B7/04E21B7/20E21B33/13
CPCE21B43/305E21B43/295E21B43/24E21B7/04E21B7/046E21B7/20E21B33/13E21B41/0099
Inventor 伍丕济
Owner 伍丕济
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