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Method for extracting oil in steam stimulation in single well by combining microorganisms and CO2 in heavy oil well

A microbial and CO2 technology, applied in the direction of chemical instruments and methods, wellbore/well components, drilling compositions, etc., can solve the problems of rising water content near the wellbore, high water treatment costs, high steam costs, etc., to reduce oil and water The effect of interfacial tension, reducing the viscosity of heavy oil, and simple process implementation

Active Publication Date: 2015-02-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steam huff and puff technology has the following problems: (1) The cost of generating steam is high, especially in areas where water resources are scarce and expensive, and water treatment costs are high; (2) Due to steam injection, oil well heat loss, sand production , Casing damage, etc. are more serious, affecting the utilization rate of oil wells and the implementation of technological measures; (3) With the increase of steam huff and puff cycles, the water content in the near wellbore area rises, consuming most of the steam heat, and the degree of effective utilization of heat energy becomes smaller. (4) Some heavy oil wells completed without thermal recovery cannot perform steam injection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: Taking the heavy oil well G1 of a certain oil field as an example

[0035] In a G1 heavy oil well in an oilfield, the viscosity of crude oil is 1663mPa.s, the temperature of the reservoir is 66°C, the pressure of the reservoir is 12.07Mpa, the effective thickness of the reservoir is 6.9m, the porosity is 0.28, and the permeability is 735×10 -3 μm 2 , the formation water salinity is 14327mg / L, and the well was shut down in June 2013 due to no oil production. Implement the steps of the present invention as follows:

[0036] (1) Screening of test wells

[0037] The temperature of test oil well G1 is 50×10 -3 μm 2 , which meet the well screening criteria, therefore, the well is suitable for microbial and CO 2 Composite single well throughput test.

[0038] (2) Screening of microorganisms and nutrients

[0039] After indoor experiments, the microorganisms screened out are Geobacillus, and the nutrient composition is sucrose, corn steep liquor dry powder ...

Embodiment 2

[0054] Embodiment 2: Taking the heavy oil well F2 of a certain oil field as an example

[0055] F2 heavy oil well in an oilfield, the viscosity of crude oil is 1819mPa.s, the reservoir temperature is 56℃, the reservoir pressure is 12.93Mpa, the effective thickness of the reservoir is 2.6m, the porosity is 0.3, and the permeability is 1130×10 -3 μm 2 , the formation water salinity is 12378mg / L. Implement the steps of the present invention as follows:

[0056] (1) Screening of test wells

[0057] The temperature of test oil well F2 is less than 100℃, the viscosity of crude oil is less than 5000mPa.s, the degree of salinity is less than 50000mg / L and the permeability is more than 50×10 -3 μm 2 , which meet the well screening criteria, therefore, the well is suitable for microbial and CO 2 Composite single well throughput test.

[0058] (2) Screening of microorganisms and nutrients

[0059] After indoor experiments, the microorganisms screened out are Pseudomonas, and their...

Embodiment 3

[0075] Embodiment 3: Taking the heavy oil well K3 of a certain oil field as an example

[0076] K3 heavy oil well in an oilfield, the viscosity of crude oil is 2312mPa.s, the reservoir temperature is 72℃, the reservoir pressure is 10.1Mpa, the effective thickness of the reservoir is 8.2m, the porosity is 0.35, and the permeability is 1860×10 -3 μm 2 , the formation water salinity is 9876mg / L. Implement the steps of the present invention as follows:

[0077] (1) Screening of test wells

[0078] The temperature of test oil well K3 is 50×10 -3 μm 2 , which meet the well screening criteria, therefore, the well is suitable for microbial and CO 2 Composite single well throughput test.

[0079] (2) Screening of microorganisms and nutrients

[0080] After indoor experiments, the microorganisms screened out are Bacillus subtilis, and its nutrients consist of glucose, ammonium chloride and K 2 HPO 4 , glucose, ammonium chloride and K 2 HPO 4 The mass ratio is 1:0.5:0.1.

[0...

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Abstract

The invention belongs to the technical field of tertiary oil recovery and particularly relates to a method for extracting oil in single well steam stimulation by combining microorganisms and CO2 in the heavy oil well. The method comprises the following steps: (1) screening test oil wells; (2) screening microorganisms and nutrients thereof; (3) injecting the microorganisms and the nutrients thereof into the stratum of the test oil well; (4) injecting liquid CO2; (5) shutting the test oil well down; (6) opening the test oil well for production. The method disclosed by the invention has the advantage of wide application range and is simple in process implementation; oil well sand production and sleeve damage situations are avoided and the oil well utilization rate is high; the thickened oil viscosity can be greatly reduced, the oil-water interfacial tension is reduced, the stratum energy can be effectively replenished, the characteristics of long action period, remarkable enhanced production effect of oil, and the like are achieved, and therefore, the method is an economic and effective method for increasing the yield of the heavy oil well and can be widely applied to a single well steam stimulation technology of the heavy oil well.

Description

1. Technical field [0001] The invention relates to a method for tertiary oil recovery, in particular to a microbial and CO 2 Composite throughput method. 2. Background technology [0002] my country's onshore heavy oil resources account for more than 20% of the total petroleum resources. The national heavy oil resources are about 19.87 billion tons, and the proven heavy oil geological reserves are about 2.06 billion tons. The crude oil production of heavy oil reservoirs has reached 7% of the total crude oil production, and the development of heavy oil has become an important part of crude oil production in my country. And with the reduction of light oil production reserves, the proportion of heavy oil production will continue to increase. [0003] Due to the high content of asphalt colloid and low wax content, heavy oil has high viscosity, difficult flow, and great difficulty in mining. At present, steam stimulation technology is the main method of heavy oil production in ...

Claims

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Application Information

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IPC IPC(8): E21B43/22
CPCC09K8/582C09K8/594E21B43/16E21B43/164E21B43/20
Inventor 宋永亭李彩风王刚徐鹏潘永强徐登霆刘涛巴燕段传慧吴晓玲张守献
Owner CHINA PETROLEUM & CHEM CORP
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