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Stratum catalytic oxidation thick oil thermal recovery method

A technology for catalytic oxidation and thermal recovery of heavy oil, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., to achieve the effects of reducing steam consumption, cost, and oil-water interfacial tension

Inactive Publication Date: 2009-09-23
LIAOHE GASOLINEEUM EXPLORATION BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on catalytic oxidation recovery of heavy oil formation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: It is planned to inject 2,400 tons of steam into a heavy oil steam huff and puff well with a viscosity of 8.088 Pa·S and an acid value of 4.04 mgKOH / g. Before injecting steam, first inject 30 tons of catalyst aqueous solution with a concentration of 10%, and then use an air compressor to inject air 12x10 4 m 3 (The quality is 6.25% of steam), and then inject 2400 tons of steam. After soaking for 7 days, the viscosity dropped to 4.94Pa·S, the acid value rose to 17.11mgKOH / g, and a good mining effect was obtained.

Embodiment 2

[0012] Example 2: It is planned to inject 2,000 tons of steam into a heavy oil steam huff and puff well with a viscosity of 3.826Pa·S and an acid value of 2.89mgKOH / g. Before injecting steam, first inject 30 tons of catalyst aqueous solution with a concentration of 10%, and then use an air compressor to inject air 12x10 4 m 3 (The quality is 7.8% of steam), and then inject 2000 tons of steam. After 7 days of soaking reaction, the well was put into production, the viscosity dropped to 2.24Pa·S, and the acid value rose to 22.53mgKOH / g, achieving a good production effect.

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PUM

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Abstract

The invention relates to a stratum catalytic oxidation thick oil thermal recovery method which is as follows: a catalyst with a catalytic oxidation function and a cracking function is injected during a thick oil steam gorge and disgorge or steam drive process, and a certain amount of air is injected in an auxiliary way; catalytic oxidation and cracking reaction is generated inside a stratum during soaking and the steam drive to enable crude oil to lightly reduce viscosity, and a surface active agent which can improve the liquidity of the crude oil is also generated, thus the purpose of enhancing the thick oil recovery effect of thick oil is achieved. The invention is integrated with multiple modes such as the thick oil steam gorge and disgorge or the steam oil drive, stack gas oil drive, surface active agent oil drive and thin oil dilution method oil recovery and is a compound high-efficiency oil recovery technique; the thick oil inside an oil layer generates stack gas, hydrocracks, reduces the viscosity, generates the surface active agent and reduces the tension of an oil-water boundary on the spot under the action of the catalytic oxidation; and in addition, the stratum catalytic oxidation thick oil thermal recovery method can reduce the steam usage amount, the heating temperature of the oil layer and the thick oil recovery cost.

Description

Technical field: [0001] The invention relates to a method for heavy crude oil exploitation, especially a method for thermal recovery of heavy oil by injecting catalyst into an oil layer, which belongs to the category of oil recovery technology. Background technique: [0002] At present, steam thermal extraction is mostly used in the production of heavy oil, and its core technology is to improve the fluidity of crude oil by heating the oil layer or wellbore to achieve the purpose of smooth production. However, heavy oil production by steam injection will cause certain pollution to the environment while burning a large amount of fuel. With the increase of steam injection rounds, the degree of damage to oil well casing will also increase, resulting in deformation of oil well casing and affecting production. At the same time, due to the continuous increase of condensed water in the formation, it is not conducive to the development of heavy oil reservoirs and the improvement of r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/241
Inventor 宋启辉刘付臣唐晓东张瑞伏刘杰徐志马丽辉苏启龙钟宏
Owner LIAOHE GASOLINEEUM EXPLORATION BUREAU
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