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A method for improving recovery of deep ultra-heavy oil reservoirs

A technology for ultra-heavy oil and recovery factor, which is applied in the field of oil recovery technology and deep-seated ultra-heavy oil recovery to achieve the effects of increasing oil recovery rate, reducing steam injection pressure, and reducing oil-water mobility ratio

Active Publication Date: 2017-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the method of water-soluble nano-catalysts to improve the recovery of deep ultra-heavy oil reservoirs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The method proceeds as follows:

[0037] a. Reservoir condition selection: carry out rough screening according to the geological characteristics and development status of the oilfield. The reservoir meets the following conditions: the depth of the oil layer is less than 3000m, the thickness of the oil layer is greater than 5 meters, the net-to-gross ratio is greater than 0.3, the remaining oil saturation is greater than 0.3, the average porosity of the oil layer is greater than 0.25, and the viscosity of the surface degassed crude oil is less than 1000000mPa.s;

[0038] b. During the process of steam stimulation or steam flooding, when the viscosity of surface degassed crude oil is greater than 100,000mPa.s, and the steam injection pressure is less than 18Mpa, the concentration of water-soluble nano-nickel catalyst in the accompanying steam injection is 620g / m 3 Injection of water-soluble nano-nickel catalyst;

[0039] c. After the construction is completed, soak the w...

Embodiment 2

[0041] The method proceeds as follows:

[0042] a. Reservoir condition selection: carry out rough screening according to the geological characteristics and development status of the oilfield. The reservoir meets the following conditions: the depth of the oil layer is less than 3000m, the thickness of the oil layer is greater than 5 meters, the net-to-gross ratio is greater than 0.3, the remaining oil saturation is greater than 0.3, the average porosity of the oil layer is greater than 0.25, and the viscosity of the surface degassed crude oil is less than 1000000mPa.s;

[0043] b. During the process of steam stimulation or steam flooding, when the viscosity of surface degassed crude oil is greater than 100,000mPa.s, and the steam injection pressure is less than 18Mpa, the concentration of water-soluble nano-nickel catalyst in the accompanying steam injection is 580g / m 3 Injection of water-soluble nano-nickel catalyst;

[0044] c. After the construction is completed, soak the wel...

Embodiment 3

[0046] The method proceeds as follows:

[0047] a. Reservoir condition selection: carry out rough screening according to the geological characteristics and development status of the oilfield. The reservoir meets the following conditions: the depth of the oil layer is less than 3000m, the thickness of the oil layer is greater than 5 meters, the net-to-gross ratio is greater than 0.3, the remaining oil saturation is greater than 0.3, the average porosity of the oil layer is greater than 0.25, and the viscosity of the surface degassed crude oil is less than 1000000mPa.s;

[0048] b. In the process of heavy oil steam huff and puff or steam flooding, when the viscosity of ground degassed crude oil is less than 500000mPa.s, and the steam injection pressure is greater than 18MPa, according to the formation parameters and production conditions of the oil layer, the injection steam volume is determined to be 1000m 3 , after preheating the oil layer, the concentration of the water-solub...

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Abstract

The invention relates to a new method for improving the recovery rate of deep ultra-heavy oil reservoirs. The method is to inject a water-soluble nano-catalyst in the process of steam stimulation and steam flooding, so that the viscosity of ultra-ultra-heavy oil under reservoir conditions is increased. It can be greatly reduced, improve the fluidity of ultra-heavy oil under reservoir conditions, effectively make up for the shortcomings of high steam injection pressure and low bottom-hole steam dryness in deep ultra-heavy oil reservoirs, and can also reduce the amount of steam injected, thereby To achieve the purpose of economical and efficient development of deep ultra-heavy oil reservoirs. On the basis of steam huff and puff or steam flooding, this method can reduce the viscosity of crude oil by more than 80%, increase the recovery degree by about 15%, and increase the oil-steam ratio of the huff and puff well cycle by 0.15.

Description

technical field [0001] The invention relates to a new method for improving the recovery rate of deep super-heavy oil reservoirs, in particular to a new method for deep super-heavy oil production by injecting water-soluble nano-catalysts into formations, which belongs to the category of oil recovery technology. Background technique [0002] At present, ultra-heavy oil production mainly uses steam injection to improve the fluidity of ultra-heavy oil and realize the effective production of ultra-heavy oil. However, for deep ultra-heavy oil, due to the high viscosity of the crude oil, it is like a thick thick oil wall in the formation, making it difficult for steam to penetrate in. The thermal sweep volume of steam injection is very limited, that is, it can only heat Heavy oil with small underground volume; the reservoir is buried deep (greater than 1800m), the steam injection pressure is high, the steam injection quality is basically 0, the cycle oil-steam ratio is low, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/22
Inventor 盖平原谢志勤林吉生武继辉何绍群贺文媛翟勇赵晓红白艳丽郝婷婷
Owner CHINA PETROLEUM & CHEM CORP
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