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Method for increasing shale oil recovery ratio by utilizing air oxidation thermal cracking

A technology of air oxidation and shale oil, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc.

Active Publication Date: 2018-07-06
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The initial temperature of the reservoir was only 30.6°C, and the underground viscosity of crude oil was 2700cP (Gates and Ramey, 1958). However, after 3 months of air injection, without any ignition measures, the well temperature of the observation well reached 538°C, which fully demonstrated that spontaneous combustion occurred up

Method used

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  • Method for increasing shale oil recovery ratio by utilizing air oxidation thermal cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]The air is injected into the shale oil reservoir through the injection well using an air compressor, and the shale oil reservoir includes shale oil and organic matter, and the organic matter includes kerogen; the shale oil in the air and shale, dry root When the organic matter regenerates, the air oxidation reaction generates heat or even burns, the temperature of the shale formation rises and the shale formation is thermally ruptured, the shale oil is diverted to the production well, and the shale oil is collected;

[0038] The injection amount of the air is equivalent to the formation pore volume between the injection well and the production well;

[0039] The pressure of air injection is the highest injection pressure allowed by the equipment;

[0040] The flowing pressure of the production well is the minimum production pressure allowed by the production well facility.

[0041] The results show that: the recovery rate of the shale oil in Example 1 is 80%.

Embodiment 2

[0043] The air and water are injected into the shale reservoir through the injection well in an alternating cycle, and the shale reservoir includes shale oil and organic matter, and the organic matter includes kerogen; the crude oil in the air and shale, the dry Roots and other organic matter regenerate air oxidation reaction to generate heat and even burn. The temperature of the shale formation rises and the shale formation is thermally ruptured. The shale oil is diverted to the production well, and the shale oil is recovered;

[0044] The injection amount of the air is 20% of the formation pore volume between the injection well and the production well; the injection amount of the water is 20% of the formation pore volume between the injection well and the production well;

[0045] The pressures of air and water injection are the highest injection pressure allowed by the equipment.

[0046] The result shows: the recovery rate of the shale oil of embodiment 2 is 85%;

[0047]...

Embodiment 3

[0049] The air and water are injected into the shale reservoir through the injection well in an alternating cycle, and the shale reservoir includes shale oil and organic matter, and the organic matter includes kerogen; the crude oil in the air and shale, the dry Inject linseed oil into the shale oil reservoir when the heat is generated by the air oxidation reaction of roots and other organic matter, but not enough to burn, so that the combustion reaction occurs, the temperature of the shale formation rises and the heat breaks the shale formation, and the shale oil is diverted to production wells, to collect shale oil;

[0050] The injection rate of the air is 20% of the formation pore volume between the injection well and the production well; the injection rate of the water is 20% of the formation pore volume between the injection well and the production well; the injection of the linseed oil 1% of the formation pore volume between injection and production wells;

[0051] The...

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Abstract

The invention provides a method for increasing the shale oil recovery ratio by utilizing air oxidation thermal cracking. The method comprises the following steps that air is injected into a shale oilreservoir through an injection well, thermal cracking occurs to the shale formation, shale oil is guided into a production well, and the shale oil is obtained through recovery; the shale oil reservoircomprises an organic-matter-enriching oil reservoir, and organic matter comprises kerogen; and the injection amount of air is equivalent to the formation pore volume between the injection well and the production well. The air is injected into the shale oil reservoir through the injection well, the air generates an air oxidation reaction with the organic matter such as the shale oil and the kerogen inside shale to generate heat and even burn, the temperature of the shale formation is increased and thus thermal cracking occurs, the flow guiding capacity of the shale is greatly improved, the shale oil is guided into the production well, and the shale oil is obtained through recovery. The result shows that the recovery ratio of the shale oil reaches 80% or above through the method provided bythe invention.

Description

technical field [0001] The invention relates to the technical field of collecting shale oil, in particular to a method for improving the recovery rate of shale oil by using air oxidation thermal fracturing. Background technique [0002] Shale oil refers to the petroleum resources contained in shale-based shale formations, including oil in pores and fractures of mud shale, as well as tight carbonatite or clastic rock adjacent layers in mud shale formations and oil resources in the interlayer. [0003] Air injection enhanced oil recovery technology started from the development of heavy oil reservoirs. Through spontaneous combustion or artificial ignition, the crude oil in the reservoir is burned, and the main fuel is the heavy components in crude oil. Then the temperature of the oil layer can be increased, the viscosity of crude oil can be reduced, and the purpose of enhancing the recovery of heavy oil can be realized. Later, air flooding technology was introduced into the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B43/247
CPCE21B43/168E21B43/247
Inventor 盛家平宋岩姜振学李根生
Owner CHINA UNIV OF PETROLEUM (BEIJING)