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Method for underground in-situ extraction of hydrocarbon compound in oil shale

A technology for extracting oil and compounds, which is applied in the direction of earthwork drilling, wellbore/well components, and production fluids, etc. It can solve the problems of large heat loss, difficult fluid control, and high energy consumption, so as to improve the utilization rate of heat, Save energy and time, shorten the effect of the process

Active Publication Date: 2010-10-27
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Due to the small thermal conductivity of oil shale, the current ICP technology still has a large heat loss, and the heating time of underground carbonization is relatively long. According to the patent CN 1875168A, it takes 4-5 years to crack 20% of kerogen, and 60-70% cracking needs For 10 years, the energy consumption is high, the cost is high, and there are still problems such as the fluid is not easy to control during heating

Method used

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  • Method for underground in-situ extraction of hydrocarbon compound in oil shale
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  • Method for underground in-situ extraction of hydrocarbon compound in oil shale

Examples

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Effect test

Embodiment 1

[0045]a. Arrange three working wells 2 and one production well 1 in the delineated working area for extracting hydrocarbons in oil shale. The plane distribution of working wells 2 is triangular. The distance between them is 18m, and the distance between production well 1 and working well 2 is 10.39m;

[0046] b. After the well enters the oil shale deposit, the bottom between the connected working wells is drilled through directional drilling;

[0047] c. The oil shale is deposited downward by directional blasting, producing regular and irregular fissures; the resulting fissures are filled with sand to support the fissures, so as to facilitate the penetration and flow of near-critical water;

[0048] d. Inject water into the working well 2, and stop injecting when the water surface reaches the top plate of the oil shale layer;

[0049] e. Inject nitrogen gas into the working well 2 to make the pressure in the well reach 2MPa, close the working well 2 and the production well 1,...

Embodiment 2

[0054] a. Arrange four working wells 2 and one production well 1 in the delineated working area for extracting hydrocarbons in oil shale. The distance between them is 20m, and the distance between production well 1 and working well 2 is 14.14m;

[0055] b. After the well enters the oil shale deposit, the bottom between the connected working wells is drilled through directional drilling;

[0056] c. The oil shale is deposited downward by directional blasting, producing regular and irregular fissures; the resulting fissures are filled with sand to support the fissures, so as to facilitate the penetration and flow of near-critical water;

[0057] d. Inject water vapor at a temperature of 400°C into the working well 2, and stop the injection when the water surface reaches the roof of the oil shale layer;

[0058] e. Close working well 2 and production well 1, heat to form a microenvironment of 330°C and 9MPa near-critical water in the oil shale layer, and keep the temperature and...

Embodiment 3

[0063] a. Arrange six working wells 2 and one production well 1 in the delineated working area for extracting hydrocarbons in oil shale. The plane distribution of the working wells 2 is hexagonal. The distance from the working well 2 is 19m, and the distance between the production well 1 and the working well 2 is 19m;

[0064] b. After the well enters the oil shale deposit, the bottom between the connected working wells is drilled through directional drilling;

[0065] c. The oil shale is deposited downward by directional blasting, producing regular and irregular fissures; the resulting fissures are filled with sand to support the fissures, so as to facilitate the penetration and flow of near-critical water;

[0066] d. Inject water into the working well 2, and stop injecting when the water surface reaches the top plate of the oil shale layer;

[0067] e. Inject carbon dioxide gas into the working well 2 to make the pressure in the well reach 3MPa, close the working well 2 an...

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Abstract

The invention relates to a method for the underground in-situ extraction of a hydrocarbon compound in an oil shale, which comprises the following steps: arranging at least one working well and one production well in an enclosed working region where the hydrocarbon compound in the oil shale is extracted, communicating the bottoms among the working wells by directional drilling after a drilling well enters an oil shale ore layer, injecting water and inert gas water vapor into the working well to form a near-critical water microenvironment, cracking the oil shale into organic compounds with different chain lengths to form an oil-water mixture, lifting the oil-water mixture to the ground through the production well, and obtaining the hydrocarbon compound through an oil-water separating system. The heat utilization ratio is improved through a multi-well integrated heat circulating system, the extraction ratio of hydrocarbon substances is greatly improved through repeated oil-water separating and circulating processes, and the technical process is shortened. A water micro-pool is formed after an oil shale layer is overflowed by water, the cracking of the oil shale can be realized within3 to 5 hours after a near-critical state is reached, and more energy sources and time are saved than an underground dry distillation method.

Description

Technical field: [0001] The invention relates to an extraction of organic compounds in oil shale, specifically a technique for extracting organic compounds in low-permeability oil shale by using near-critical water as a medium for underground in-situ cracking of shale oil. technical background: [0002] Oil shale, also known as kerogen shale, is a sedimentary rock containing organic matter, generally belonging to sapropel peat with high mineral content, and is a solid fossil fuel with low calorific value. As an unconventional energy source, oil shale has huge reserves and broad prospects for development. With the rapid development of the world economy, oil resources are decreasing day by day. As an important oil supplement and alternative energy, oil shale has attracted the attention of the whole world. Organic matter in oil shale is divided into two categories: kerogen and bitumen. Kerogen is insoluble in common organic solvents, but bitumen is soluble in organic solvents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B43/24E21B43/241E21B43/248E21B43/30
Inventor 王洪艳邓孙华李俊锋顾强王志军陈晨
Owner JILIN UNIV
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