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Method for exploiting oil and gas products in underground thin and medium-thickness oil shale ore bed through pyrolysis

An oil shale and underground heat technology, which is applied in the fields of fluid extraction, earthwork drilling, wellbore/well components, etc., can solve the problems of ineffective utilization of heat in the ore seam and high design cost of the middle wellbore, so as to reduce the production cost and save solids. The effect of high well cost and energy utilization

Active Publication Date: 2021-04-30
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 of thin and medium-thick oil shale deposits; it solves the problem of excessive wellbore design costs in the existing in-situ mining of thin and medium-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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  • Method for exploiting oil and gas products in underground thin and medium-thickness oil shale ore bed through pyrolysis
  • Method for exploiting oil and gas products in underground thin and medium-thickness oil shale ore bed through pyrolysis
  • Method for exploiting oil and gas products in underground thin and medium-thickness oil shale ore bed through pyrolysis

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Embodiment 1

[0038] When the thickness of the oil shale deposit is 5m and the buried depth is 100m, the concrete steps of the method for exploiting oil and gas products from the underground pyrolysis thin oil shale deposit are as follows:

[0039] 1. Drill wells in the target area selected by the oil shale mine. The well layout is "Y-shaped", and the middle well 1, the middle circle well 2 and the peripheral well 3 are formed in sequence from the inside to the outside, and a total of 7 wells are arranged. , the well spacing between the middle well 1 and the middle well 2 is 70m, and the well spacing between the middle well 2 and the peripheral well 3 is 50m;

[0040] 2. Lower the well pipes in each drilling hole. The lowering position of the well pipes should be close to the bottom of the shale layer 5 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. treatment, so as to red...

Embodiment 2

[0047] When the thickness of the oil shale deposit is 15m and the buried depth is 200m, the specific steps of the method for exploiting oil and gas products from the underground pyrolysis medium-thick oil shale deposit are as follows:

[0048] 1. Drill wells in the selected target area of ​​the oil shale mine. The layout of the wells is "cross-line", and the middle well 1, the middle well 2 and the peripheral well 3 are formed in sequence from the inside to the outside, and a total of 9 wells are arranged. 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;

[0049] 2. Lower the well pipes in each drilling hole. The lowering position of the well pipes should be close to the bottom of the shale layer 5 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...

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Abstract

The invention relates to a method for exploiting oil and gas products in an underground thin and medium-thickness oil shale ore bed through pyrolysis, and belongs to the field of unconventional oil and gas resource exploitation and utilization. Well type arrangement is conducted in a Y-shaped or cross-line-shaped mode within the thickness range of the ore bed, hydraulic fracturing is conducted on the ore bed through all shafts, and a propping agent is injected into high-pressure water, so that the opening degree and connectivity of cracks in the ore bed are ensured; in the different shafts, only the middle shaft is subjected to heat preservation treatment to serve as a heat injection well, and the middle ring well and the peripheral well serve as production wells; in the heat injection process, the processes of injecting high-temperature water vapor into the middle well, exploiting oil and gas through the middle ring well, taking the middle ring well as an oxygen injection gas well, injecting condensate water into the middle well, exploiting oil and gas through the peripheral well and the like are sequentially conducted, and thus large-range pyrolysis and oil and gas exploitation work of the ore bed is conducted; and the problems that in an existing in-situ thin and medium-thickness oil shale ore bed exploitation technology, the shaft design cost is too high, and huge heat of the ore bed after pyrolysis cannot be effectively utilized are solved.

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 thin and medium-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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IPC IPC(8): E21B43/241E21B43/30E21B43/267
CPCE21B43/241E21B43/30E21B43/267
Inventor 王磊康志勤杨栋何继来赵静王国营黄旭东张驰张超
Owner TAIYUAN UNIV OF TECH
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