Method for modifying and exploiting oil shale in situ through fluid

An oil shale, first fluid technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of difficult fluid heating, high energy consumption, low electric heating efficiency, etc., to prevent rapid channeling flow, the effect of expanding the contact area

Inactive Publication Date: 2017-02-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the defects of low electric heating efficiency, high energy consumption, slow heat transfer, difficult injection of fluid heating or serious channeling, and low heating efficiency in the existing in-situ mining technology of oil shale, the present invention provides a method for using fluid to heat oil shale The method of in-situ reformation and exploitation enables the fluid not only to be injected into the formation, but also to have a larger contact area with the oil shale reservoir, to improve the heating efficiency of the fluid, and to further increase the conversion rate of kerogen and the recovery rate of oil shale oil and gas

Method used

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  • Method for modifying and exploiting oil shale in situ through fluid
  • Method for modifying and exploiting oil shale in situ through fluid
  • Method for modifying and exploiting oil shale in situ through fluid

Examples

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Embodiment 1

[0054] Such as figure 2 As shown, using the method of the present invention, in a near-horizontal single oil shale mineral layer with a thickness of 12m and an average burial depth of the oil shale top interface of 94m, arrange 2 wells (1 injection well+1 production well) . The specific steps are:

[0055] 1) An inclined horizontal well is drilled in parallel from the ground to the middle of the oil shale layer (depth 100m) as an injection well. The length of the horizontal section is 40m, and the horizontal section is completed with open holes. Drill a vertical well 5m from the toe of the horizontal well to the bottom of the oil shale layer (depth 104m) as a production well.

[0056] 2) if Figure 7 As shown in Fig. 1, the horizontal section of the injection well is subjected to segmented fixed-surface compound perforation. Every 10m section from the toe to the heel of the horizontal well is divided into four sections, and fixed-surface compound perforation is carried ou...

Embodiment 2

[0063] Such as figure 2 As shown, adopt the method of the present invention, in a thickness be 28m, the average burial depth of oil shale reservoir top surface is 786m in the nearly horizontal single oil shale mineral layer, arrange 2 wells (1 injection well+1 production well well). The specific steps are:

[0064] 1) An inclined horizontal well is drilled in parallel from the ground to the middle of the oil shale layer (800m deep) as an injection well. The length of the horizontal section is 60m, and the horizontal section is completed with open holes. Drill a vertical well 9m from the toe of the horizontal well to the bottom of the oil shale layer (810m deep) as a production well.

[0065] 2) if Figure 5 and Figure 6 As shown in Fig. 1, the horizontal section of the injection well is reconstructed by first perforating the surface and then deflagration fracturing. Every 20m section from the toe to the heel of the horizontal well is divided into three sections, and the...

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Abstract

The invention provides a method for modifying and exploiting oil shale in situ through fluid. The method comprises the steps that firstly, a plurality of wells are drilled to an oil shale stratum and serve as injection wells and / or producing wells; secondly, the oil shale stratum is modified, and cracks are generated accordingly; thirdly, treating agents are injected into the oil shale stratum; and fourthly, the fluid is injected into the oil shale stratum through the injection wells, the oil shale is heated to crack so as to generate oil gas, the oil gas and the injected fluid flow out of the producing wells, and oil-gas separation is conducted on the ground. According to the method for modifying and exploiting the oil shale in situ through the fluid, the fluid can be injected into the stratum and has a large contact area with the oil shale stratum, the fluid heating efficiency is improved, and the petrologen converting ratio and the oil shale oil and gas recovery rate are further increased.

Description

technical field [0001] The invention belongs to the field of in-situ mining of oil shale, and in particular relates to a method for in-situ transformation and mining of oil shale by using fluid. Background technique [0002] With the continuous deepening of oil and natural gas development and the increasing demand for energy in countries around the world, the situation of conventional energy supply is becoming increasingly severe. After entering the 21st century, the development speed of shale gas in the United States began to accelerate. Especially after 2003, with the advancement of horizontal well drilling and staged multi-stage fracturing technology, breakthroughs were made in shale gas exploration and development. Therefore, people have shifted more attention to unconventional oil and gas resources, and unconventional oil and gas resources will become a strategic supplementary energy source for conventional oil and gas resources in the post-petroleum era. [0003] Oil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/22E21B43/241E21B43/30E21B43/34
Inventor 龙秋莲高媛萍苏建政王益维孟祥龙汪友平黄志文
Owner CHINA PETROLEUM & CHEM CORP
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