Method for raising recovery efficiency of heavy oil deposit through chemical steam flooding

A heavy oil reservoir, chemical steam technology, applied in the field of chemical steam flooding, can solve the problems affecting steam flooding effect and recovery, small steam sweep volume, uneven steam displacement, etc.

Inactive Publication Date: 2015-09-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong heterogeneity of the reservoir, and large water-flooded channels have been formed in some areas in the middle and late stages of huff and puff, conventional steam flooding is likely to cause uneven displacement of steam, large heat loss, and small steam sweep volume , which greatly affects the steam flooding effect and recovery factor

Method used

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  • Method for raising recovery efficiency of heavy oil deposit through chemical steam flooding
  • Method for raising recovery efficiency of heavy oil deposit through chemical steam flooding
  • Method for raising recovery efficiency of heavy oil deposit through chemical steam flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method proceeds as follows:

[0024] ①. Select oil reservoirs with burial depth of 900m, effective oil layer thickness ≥ 8m, and crude oil viscosity > 100 mPa.s under oil layer conditions, and inject 0.25 times the formation pore volume of steam first, and the steam injection rate is 1.6 tons per day. per hectare. thickness per meter;

[0025] ②. Mix sulfonate containing benzene ring with straight chain structure on benzene ring, nitrogen with purity ≥ 95% and steam into the steam injection well for 30 days. The mass concentration of the structural sulfonate is 200000mg / L, the injection amount of the sulfonate containing benzene ring and the linear structure on the benzene ring: steam injection amount = 1.2: 100 parts by mass ratio, nitrogen injection amount: steam injection Volume = 0.5:100 underground volume ratio, steam injection rate is 2.0 tons / day. per hectare. per meter of thickness;

[0026] ③. Mix and inject the sulfonate containing aromatic groups and st...

Embodiment 2

[0030] The method proceeds as follows:

[0031] ①. Select oil reservoirs with burial depth of 1600m, effective oil layer thickness ≥ 8m, and crude oil viscosity > 100 mPa.s under oil layer conditions, and inject 0.2 times the formation pore volume of steam first, and the steam injection rate is 2.0 tons per day. per hectare. thickness per meter;

[0032] ②. Mix sulfonate containing benzene ring with straight chain structure on benzene ring, nitrogen with purity ≥ 95% and steam into the steam injection well for 10 days. The mass concentration of the structural sulfonate is 300000mg / L, the injection amount of the sulfonate containing benzene ring and the linear structure on the benzene ring: steam injection amount = 0.4: 100 parts by mass ratio, nitrogen injection amount: steam injection Volume = 1.5:100 underground volume ratio, steam injection rate is 1.6 tons / day. per hectare. per meter of thickness;

[0033] ③. Inject the aromatic group-containing sulfonate and steam into ...

Embodiment 3

[0037] The method proceeds as follows:

[0038] ①. Select oil reservoirs with burial depth of 1250m, effective oil layer thickness ≥ 8m, and crude oil viscosity > 100 mPa.s under oil layer conditions, and inject 0.22 times the formation pore volume of steam first, and the steam injection rate is 1.8 tons per day. per hectare. thickness per meter;

[0039] ②. Mix sulfonate containing benzene ring with straight chain structure on benzene ring, nitrogen with purity ≥ 95% and steam into the steam injection well for 20 days. The mass concentration of the sulfonate of the structure is 250000mg / L, the injection amount of the sulfonate containing benzene ring and the linear structure on the benzene ring: steam injection amount = 0.8: 100 parts by mass ratio, nitrogen injection amount: steam injection Quantity=1.0:100 volume ratio, steam injection rate is 1.8 tons / day. per hectare. per meter of thickness;

[0040] ③. Inject the aromatic group-containing sulfonate and steam into the s...

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Abstract

The invention provides a method for raising the recovery efficiency of a heavy oil deposit through chemical steam flooding. The method comprises steps of: 1. selecting an oil deposit and injecting steam, wherein the burial depth of an oil layer of the selected oil deposit is 900 to 1600 m, the effective thickness of the oil layer is greater than or equal to 8 m, the viscosity of crude in the oil layer is greater than 100 mPa.s, and the volume of the injected steam is 0.2 to 0.25 times of that of pores in the stratum; 2. injecting a foaming agent, nitrogen and steam in a steam injection well in a mixed mode for 10 to 30 days, wherein the ratio of the injected foaming agent to the injected steam, by mass, is equal to (0.4 to 1.2) to 100, and the ratio of the injected nitrogen to the injected steam, by volume underground, is equal to (0.5 to 1.5) to 100; 3. injecting an oil displacement agent and steam in the steam injection well in a mixed mode for 5 to 10 days, wherein the ratio of the oil displacement agent to the injected steam, by mass, is equal to (0.2 to 0.8) to 100; 4. only injecting steam for 80 to 120 days; and 5. repeating steps 2, 3 and 4. The speed of steam injection is 1.6 to 2.0 ton/day, hectare, thickness per meter.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oilfields, in particular to a chemical steam flooding method using foaming agent, nitrogen and oil displacement agent to assist steam flooding to enhance oil recovery. Background technique [0002] With the massive consumption of oil and gas resources and the rising demand, heavy oil resources have become the main position for the next step of oil and gas resources replacement development due to their characteristics of wide distribution, huge reserves, and low production rate of reserves. [0003] Domestic heavy oil resources are very rich, and the predicted proven reserves are 80×10 8 t, the current proven reserves are 20.6×10 8 t. However, due to the high viscosity and poor flow of heavy oil, it is difficult to exploit. At present, in the mining of heavy oil reservoirs, steam injection is the most important development method. More than 90% of the production of heavy oil comes from st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/22
Inventor 毕义泉吴光焕李伟孙建芳孙业恒李伟忠赵红雨唐亮邓宏伟李洪毅赵衍彬路言秋王传飞隋永婷王一平陈明铭
Owner CHINA PETROLEUM & CHEM CORP
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