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Process for injecting endogenous microbial oil displacement activating agents on sites

A technology of endogenous microorganisms and activators, which is applied in the production of fluids, wellbore/well components, and earth-moving drilling, etc., can solve the problems of slow microbial metabolism, unsatisfactory oil displacement effect, and low proportion, etc. The effect of overall proliferation and metabolism, enhanced oil recovery, and enhanced oil displacement efficiency

Active Publication Date: 2017-12-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The conventional on-site injection process of endogenous microbial oil displacement activators usually uses the simultaneous injection of organic nutrients and inorganic nutrients. The selectivity of this process is poor. There are a large number of bacteria groups without oil displacement function in the endogenous microorganisms, and the microbial growth rate using hydrocarbons is relatively slow, and the proportion is relatively low. Therefore, the commonly used activator injection process leads to the activator efficiency of hydrocarbon oxidizing bacteria low, resulting in unsatisfactory overall oil displacement

Method used

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  • Process for injecting endogenous microbial oil displacement activating agents on sites
  • Process for injecting endogenous microbial oil displacement activating agents on sites
  • Process for injecting endogenous microbial oil displacement activating agents on sites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A block B of Shengli Oilfield 12 , the reservoir temperature is 65°C, the pressure is 11.2MPa, and the permeability is 950×10 -3 μm 2 , the geological reserves are 3.6×10 4 t. Water content 93.2%. After the screening of activators, the inorganic nutrient activator was KNO 3 0.3wt%, K 2 HPO 4 0.01wt%, and the organic nutrition activator is glucose 3.2wt%. Utilize activator field injection technique of the present invention to carry out field test, concrete steps are as follows:

[0024] (1) On-site injection stage of inorganic nutrient activator

[0025] First, use the injected water in the test block to configure the inorganic nutrient activator solution, KNO 3 0.3wt%, K 2 HPO 4 0.01wt%; secondly, use the high-pressure injection pump to continuously inject the inorganic nutrient activator solution from the water injection well in the test block, and the injection speed is 80m 3 / d; On the 15th day after the on-site injection of inorganic nutrient activator...

Embodiment 2

[0039] A block C of Shengli Oilfield 2 , the reservoir temperature is 70°C, the pressure is 10.5MPa, and the permeability is 880×10 -3 μm 2 , The geological reserves are 7.2×10 4t. Water content 90.3%. After the screening of activators, the inorganic nutrient activator was KNO 3 0.1wt%, KH 2 PO 4 0.04wt%, and the organic nutrition activator is 5.0wt% starch. Utilize activator field injection technique of the present invention to carry out field test, concrete steps are as follows:

[0040] (1) On-site injection stage of inorganic nutrient activator

[0041] First, use the injected water in the test block to configure the inorganic nutrient activator solution, KNO 3 0.1wt%, KH 2 PO 4 0.04wt%; secondly, use the high-pressure injection pump to continuously inject the inorganic nutrient activator solution from the water injection well in the test block, and the injection speed is 90m 3 / d; On the 25th day after the on-site injection of inorganic nutrient activators, ...

Embodiment 3

[0055] A block B of Shengli Oilfield 5 , the reservoir temperature is 60°C, the pressure is 12.0MPa, and the permeability is 1150×10 -3 μm 2 , the geological reserves are 5.0×10 4 t. Water content 91.5%. After screening the activator, the inorganic nutrient activator was NaNO 3 0.5wt%, K 2 HPO 4 0.05wt%, and the organic nutrition activator is molasses 1.0wt%. Utilize activator field injection technique of the present invention to carry out field test, concrete steps are as follows:

[0056] (1) On-site injection stage of inorganic nutrient activator

[0057] Firstly, use the injected water in the test block to configure the inorganic nutrient activator solution, NaNO 3 0.5wt%, K 2 HPO 4 0.05wt%; secondly, use the high-pressure injection pump to continuously inject the inorganic nutrient activator solution from the water injection well in the test block, and the injection speed is 100m 3 / d; On the 30th day after the on-site injection of inorganic nutrient activat...

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Abstract

The invention belongs to the technical field of microbial oil recovery, and particularly relates to a process for injecting endogenous microbial oil displacement activating agents on sites. The process for injecting the activating agents on the sites particularly includes steps of carrying out phases for injecting inorganic nutrition activating agents on the sites; carrying out phases for injecting organic nutrition activating agents on the sites; carrying out circulation injection phases. The process has the advantages that the process is high in operability, pertinence and reliability, includes simple site injection procedures and is low in site test investment cost, and the cost can be reduced by 30% at least as compared with existing processes; good site test effects can be realized, the process is high in input-output ratio, the recovery ratio is increased by more than 15% in site tests, the input-output ratio is higher than 1:5, and accordingly the process can be widely applied to endogenous microbial oil displacement site tests.

Description

technical field [0001] The invention belongs to the technical field of microbial oil recovery, and in particular relates to an activator site injection process for endogenous microbial oil displacement. Background technique [0002] Endogenous microbial flooding is an important process of microbial flooding. Endogenous microbial flooding is to change the ecological structure and abundance of endogenous microorganisms in the reservoir by injecting nutrients into the reservoir, and then act on the residual oil through microorganisms to improve the fluidity of crude oil and enhance the recovery of crude oil Rate. The dominant mechanism of endogenous microbial flooding includes two aspects. One is to emulsify crude oil through microorganisms, so that the residual oil that cannot flow in water flooding flows; the other is to generate biogas through microorganisms. The gas may be dissolved in crude oil to reduce the viscosity of crude oil. It can also increase reservoir pressure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 汪卫东林军章曹嫣镔宋永亭曹功泽冯云谭晓明宋欣段传慧王静吴晓玲刘涛
Owner CHINA PETROLEUM & CHEM CORP
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