In-situ oil extraction method for oil shale

An oil shale, oil and gas technology, applied in the field of oil shale in-situ exploitation of oil or natural gas, can solve the problems of low utilization rate of heating energy and energy waste, and achieve the effects of shortening heating time, improving utilization efficiency and saving energy

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, when the oil shale in the formation is heated, a large amount of heat is dissipated into unrelated

Method used

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  • In-situ oil extraction method for oil shale
  • In-situ oil extraction method for oil shale
  • In-situ oil extraction method for oil shale

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[0021] The present invention will be further described below in conjunction with accompanying drawing.

[0022] figure 1 It schematically shows the way of arranging heater wells, gas injection wells and production wells according to the method of the present invention. like figure 1 As shown, heater wells 4, 5, and 6 are arranged in the middle, while gas injection wells 1, 2, and 3 are arranged on one side of heater wells 4, 5, and 6, and production wells 7, 8, and 9 are arranged at heater wells 4, 5. , the other side of 6. In this way, when the formation is heated through the heater wells 4, 5, and 6 in the later stage, the heat will spread around the heater well as the center of the circle, and when the heat reaches the gas injection well, it will also reach the production well, thereby greatly improving the heat utilization rate And improve the construction efficiency.

[0023] The method according to the present invention will be described in detail below by taking the...

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Abstract

The invention relates to an in-situ oil extraction method for oil shale. The in-situ oil extraction method comprises the following steps that firstly, at least three wells are drilled side by side in the area of the oil shale, wherein the well in the middle is a heating well, and the wells located at the two sides of the heating well are a gas injection well and an extraction well correspondingly; secondly, fracturing is conducted on the top area of the oil shale through the heating well, so that a first horizontal fracture area covering the gas injection well and the extraction well is formed in the top of the oil shale; and thirdly, the oil shale is heated to the pyrolysis temperature by means of the heating well, so that oil gas is generated, and the oil gas is extracted out through the extraction well. By adoption of the method provided by the invention, efficient heating of the oil shale can be achieved, and thus in-situ oil extraction efficiency for the oil shale is improved.

Description

technical field [0001] The invention relates to the field of petroleum engineering, in particular to a method for in-situ exploitation of oil or natural gas from oil shale. Background technique [0002] Oil shale is an unconventional oil and gas resource, which is considered as an important alternative energy source due to its rich organic matter content and the feasibility of development and utilization. [0003] Currently, in-situ oil recovery from oil shale refers to heating oil shale in the formation to decompose the oil shale to produce oil and gas. The oil and gas are then extracted through production wells. This method avoids the extraction of oil shale rock from deep in the formation to retort crude oil, significantly simplifying production. However, when the oil shale in the formation is heated, a large amount of heat is dissipated into irrelevant formations, resulting in a very low utilization rate of heating energy and a large waste of energy. Contents of the ...

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Application Information

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IPC IPC(8): E21B43/241E21B43/26E21B43/30E21B43/16
Inventor 王益维苏建政龙秋莲孟祥龙汪友平高媛萍
Owner CHINA PETROLEUM & CHEM CORP
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