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Endogenous microbial single-well throughput oil recovery method

A technology for endogenous microorganisms and oil wells, which is applied in chemical instruments and methods, production fluids, earthwork drilling and production, etc. It can solve the problems that affect the single-well huff and puff of endogenous microorganisms, and cannot effectively activate endogenous microorganisms. Cost-saving, targeted effect

Inactive Publication Date: 2020-03-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming of this method is: the screening of the activator in the screening step of activator is the screening carried out under the condition of reservoir temperature (average temperature of oil layer), and actual oil reservoir is made up of multi-layer oil layer, and the oil layer temperature of each layer Therefore, the activator screened by this method cannot effectively activate the endogenous microorganisms in each oil layer in the reservoir, thus affecting the effect of single well huff and puff of endogenous microorganisms to a certain extent

Method used

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  • Endogenous microbial single-well throughput oil recovery method
  • Endogenous microbial single-well throughput oil recovery method
  • Endogenous microbial single-well throughput oil recovery method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Test well F 2 Overview: Reservoir temperature is 62°C, formation water salinity is 8562mg / L, permeability is 750×10 -3 μm 2 , crude oil viscosity 2536mPa.s, water content 95.5%, test oil well has 3 oil layers, respectively F 2 1 , F 2 2 , F 2 3 , the temperature of the oil layer is 55°C, 60°C, and 70°C respectively, the total thickness of the oil layer is 8.2m, and the daily oil production of the oil well before the test is 1.2t. Implement the concrete steps of the present invention in this well as follows:

[0032] (1) Screening of test wells

[0033] Test well F 2 The reservoir temperature is 62°C, the formation water salinity is 8562mg / L, and the permeability is 750×10 -3 μm 2 , Crude oil viscosity 2536mPa.s, water content 95.5%, oil layer layer position is 3 layers, meets the screening standard of the present invention, can implement the present invention.

[0034] (2) Screening of activators

[0035] The specific steps of the screening of activators ar...

Embodiment 2

[0053]Test well F 5 Overview: Reservoir temperature is 65°C, formation water salinity is 12536mg / L, permeability is 900×10 -3 μm 2 , crude oil viscosity 3250mPa.s, water content 95.0%, test oil well has 3 oil layers, respectively F 5 1 , F 5 2 , F 5 3 , the temperature of the oil layer is 58°C, 63°C, and 72°C respectively, the total thickness of the oil layer is 12.5m, and the daily oil production of the oil well before the test is 2.1t. Implement the present invention in this well, concrete steps are as follows:

[0054] (1) Screening of test wells

[0055] Test well F 5 The reservoir temperature is 65°C, the formation water salinity is 12536mg / L, and the permeability is 900×10 -3 μm 2 , Crude oil viscosity 3250mPa.s, water content 95.0%, oil layer layer is 3 layers, meets the screening standard of the present invention, can implement the present invention.

[0056] (2) Screening of activators

[0057] The specific steps of the screening of activators are as foll...

Embodiment 3

[0075] Test well F 12 Overview: Reservoir temperature is 70°C, formation water salinity is 4562mg / L, permeability is 1100×10 -3 μm 2 , crude oil viscosity 1856mPa.s, water content 94.8%, the test oil well has 3 oil layers, respectively F 12 1 , F 12 2 , F 12 3 , the oil layer temperature is 67°C, 72°C, 78°C respectively, the total thickness of the oil layer is 10.0m, and the daily oil production of the oil well before the test is 1.8t. Implement the concrete steps of the present invention in this well as follows:

[0076] (1) Screening of test wells

[0077] Test well F 12 The reservoir temperature is 70°C, the formation water salinity is 4562mg / L, and the permeability is 1100×10 -3 μm 2 , Crude oil viscosity 1856mPa.s, water content 94.8%, oil layer layer position is 3 layers, meets the screening standard of the present invention, can implement the present invention.

[0078] (2) Screening of activators

[0079] The specific steps of the screening of activators a...

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Abstract

The invention belongs to the technical field of microbial oil recovery, and particularly relates to an endogenous microbial single-well throughput oil recovery method. The method comprises the following steps of screening a test oil well; screening an activator; determining the injection amount of the activator; determining well closing time; and carrying out field test and evaluating test results. The pertinence is strong, and screening of endogenous activators is respectively carried out for different oil layer temperatures, so that the screened activator formula can effectively activate theendogenous microorganisms in different oil layers of the test oil well; and meanwhile, the method has the characteristics of simple operation, strong operability and good field test effect, the effective period of the oil well is more than 24 months, the water content is reduced by 10 percent points or more, the average daily oil increase of a single well is more than 10t, and the input-output ratio is more than 1:8. Therefore, the method can be widely applied to field tests for improving oil well output.

Description

technical field [0001] The invention relates to a microbial oil recovery method, in particular to a method for endogenous microbial single well huff and puff oil recovery. Background technique [0002] Endogenous microbial single well huff and puff refers to the activator that is injected into the production well (oil well). The injected activator activates the endogenous microorganisms in the reservoir, and uses the effects of the endogenous microorganisms themselves and their metabolites to treat the near wellbore of the oil well. It can improve the physical properties of crude oil, reduce the flow resistance of crude oil, and increase the production of oil wells. Endogenous microbial single-well huff and puff has the characteristics of less ground investment, simple operation, and quick results. It can especially improve the physical properties of crude oil, reduce the flow resistance of crude oil, and improve the efficiency of crude oil production in the wellbore of oil ...

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/582
CPCC09K8/582E21B43/16
Inventor 孙刚正杨元亮胡婧吴晓玲汪刚跃孙立柱高光军赵凤敏宋永亭曹功泽
Owner CHINA PETROLEUM & CHEM CORP
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