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A method for extracting oil and gas products from underground pyrolysis thick and extra-thick oil shale deposits

A technology for oil shale and subterranean heat, which is applied in the fields of mining fluids, earthwork drilling, wellbore/well components, etc. It can solve problems such as high cost of wellbore design and ineffective use of heat in ore layers, so as to save pyrolysis time and energy saving The effect of cementing cost and ensuring efficiency

Active Publication Date: 2022-03-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention overcomes the deficiencies of the prior art, and proposes a method for exploiting oil and gas products from underground pyrolysis thick and extra-thick oil shale deposits; it solves the problem of excessive wellbore design costs in the existing in-situ mining of thick and extra-thick oil shale deposits. High and the problem that the huge heat of the ore layer cannot be effectively used after pyrolysis

Method used

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  • A method for extracting oil and gas products from underground pyrolysis thick and extra-thick oil shale deposits
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  • A method for extracting oil and gas products from underground pyrolysis thick and extra-thick oil shale deposits

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Embodiment 1

[0040] When the thickness of the oil shale deposit is 25m and the buried depth is 300m, the specific steps of the method for exploiting oil and gas products from the underground pyrolysis thick oil shale deposit are as follows:

[0041] 1. Drill wells in the target area selected by the oil shale mine. The layout of the wells is "six-meridian-like spider web type". From the inside to the outside, the middle well 1, the middle circle well 2 and the peripheral well 3 are arranged in sequence. There are 13 wells, the well spacing between the middle well 1 and the middle well 2 is 50m, and the well spacing between the middle well 2 and the peripheral well 3 is 30m.

[0042] 2. Lower the well pipes in each drilling hole. The lowering position of the well pipes should be close to the bottom of the oil shale layer 9 to be pyrolyzed. Among them, the middle well 1 uses a double-layer well pipe structure, and heat insulation should be carried out between the double-layer well pipes. trea...

Embodiment 2

[0049] When the thickness of the oil shale deposit 9 is 40m and the buried depth is 400m, the concrete steps of the method for extracting oil and gas products from the underground pyrolysis extra-thick oil shale deposit are as follows:

[0050] 1. Drill wells in the target area selected by the oil shale mine. The layout of the wells is "six-meridian-like spider web type". From the inside to the outside, the middle well 1, the middle circle well 2 and the peripheral well 3 are arranged in sequence. There are 13 wells, the well spacing between the middle well 1 and the middle well 2 is 50m, and the well spacing between the middle well 2 and the peripheral well 3 is 30m.

[0051] 2. Lower well pipes in each drilling hole. The lowering position of the middle well should be close to the bottom of the oil shale layer 9 to be pyrolyzed. figure 2 The shown "double Y" arrangement is lowered to different positions of the oil shale mineral layer 9, wherein half of the number of middle r...

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Abstract

The invention relates to a method for extracting oil and gas products from underground pyrolysis thick and extra-thick oil shale deposits, which belongs to the field of unconventional oil and gas resources exploitation and utilization; the well type is arranged in a "six-meridian-like spider web" manner within the thickness range of the deposit, Hydraulic fracturing is performed on the ore layer through each wellbore, and proppant is injected into high-pressure water to ensure the opening and connectivity of the fractures inside the ore layer. In different wellbores, only the middle well is subjected to thermal insulation treatment as a heat injection well, and the middle circle well and the peripheral wells are both used as production wells. Oil and gas production in different layers, oxygen injection in layers or whole layers in middle circle wells, condensed water injection in middle wells, layered or whole layer oil and gas recovery in peripheral wells, etc., so as to carry out pyrolysis and oil and gas exploitation of large-scale ore layers; solve the existing problems In the technology of in-situ mining of thick and extra-thick oil shale layers, the cost of wellbore design is too high and the huge heat of the ore layer after pyrolysis cannot be effectively utilized.

Description

technical field [0001] The invention belongs to the field of exploitation and utilization of unconventional oil and gas resources, and in particular relates to a method for exploiting oil and gas products by underground pyrolysis of thick and extra-thick oil shale deposits. Background technique [0002] Oil shale is a fine-grained sedimentary rock containing solid combustible organic matter (kerogen) that is insoluble in basic petroleum solvents. Kerogen can be cracked into gas products and oil shale oil through dry distillation, and oil shale oil can be processed to produce qualified oil products. Oil shale is an unconventional oil and gas resource, and its efficient development and utilization has an important impact and practical significance on alleviating the oil-poor and gas-poor situation in my country. [0003] At present, there are two main ways to develop oil shale resources in the world: underground mining or open-pit mining + surface retort mining and undergroun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/241E21B43/30E21B43/267
CPCE21B43/241E21B43/30E21B43/267
Inventor 王磊康志勤杨栋何继来赵静黄旭东张超王国营张驰
Owner TAIYUAN UNIV OF TECH
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