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Method for improving gasification rate of residual oil by using biological enzyme

A biological enzyme and residual oil technology, applied in the direction of microbial-based methods, biochemical equipment and methods, microbial measurement/inspection, etc., can solve the problems of slow conversion of crude oil into methane gas and low degradation efficiency, and achieve the expansion of oil Effects of storage adaptability, improvement of degradation rate, and improvement of uptake efficiency

Active Publication Date: 2019-12-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on the above knowledge, combined with the low efficiency of microbial anaerobic hydrocarbon degradation in the oil reservoir, the problem that the conversion of crude oil into methane gas is slow, the present invention is proposed.

Method used

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  • Method for improving gasification rate of residual oil by using biological enzyme
  • Method for improving gasification rate of residual oil by using biological enzyme

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Overview of the test reservoir: The thickness of the oil layer in Block A of Shengli Oilfield is 5.5m, the reservoir temperature is 50°C, the reservoir pressure is 11.8MPa, the salinity is 80500mg / L, and the permeability is 260×10 -3 μm 2 , porosity 35.5%, crude oil viscosity 1285mPa.s, water content 98.2%. After sampling and analysis, Thermotoga and Pseudomonas existed in Block A. Utilize the method of the present invention to implement the present invention in this oil well, concrete steps are as follows:

[0036] (1) Target reservoir screening

[0037] The reservoir temperature of Block A of Shengli Oilfield in the test block is 50°C, and the permeability is 260×10 -3 μm 2 , the viscosity of crude oil is 1285mPa.s, and the water content is 98.2%. Thermotoga and Pseudomonas exist in block A. Meet the screening criteria of the present invention.

[0038] (2) Analysis of the structure of the endogenous microbial community in the target oil reservoir

[0039] The ...

Embodiment 2

[0058] General situation of the test reservoir: Shengli Oilfield block F reservoir thickness 12m, reservoir temperature 65℃, reservoir pressure 13MPa, salinity 75000mg / L, permeability 550×10 -3 μm 2 , porosity 28.8%, crude oil viscosity 3548mPa.s, oil well water cut 98.5%. Desulfurization bacteria and Pseudomonas bacteria existed in the oil reservoir after sampling analysis. Utilize the method of the present invention to implement the present invention in this oil well, concrete steps are as follows:

[0059] (1) Target reservoir screening

[0060] The temperature of the reservoir in the test block F is 65°C, and the permeability is 550×10 -3 μm 2 , the viscosity of crude oil is 3548mPa.s, and the water content is 98.5%. There are desulfurization bacteria and pseudomonas in block F. Meet the screening criteria of the present invention.

[0061] (2) Analysis of the structure of the endogenous microbial community in the target oil reservoir

[0062] The analysis method of...

Embodiment 3

[0081] Overview of the test reservoir: The thickness of the oil layer in Block G of Shengli Oilfield is 13.5m, the reservoir temperature is 70°C, the reservoir pressure is 14.6MPa, the salinity is 45000mg / L, and the permeability is 1050×10 -3 μm 2 , porosity 32.8%, crude oil viscosity 5513mPa.s, oil well water cut 99.2%. Sampling and analysis showed that Thermotoga and Pseudomonas existed in the oil reservoir. Utilize method of the present invention to implement wooden invention in this oil well, concrete steps are as follows:

[0082] (1) Target reservoir screening

[0083] The reservoir temperature of the test block G is 70°C, and the permeability is 1050×10 -3 μm 2 , the viscosity of crude oil is 5513mPa.s, and the water content is 99.2%. There are Thermotoga and Pseudomonas in block G. Meet the screening criteria of the present invention.

[0084] (2) Analysis of the structure of the endogenous microbial community in the target oil reservoir

[0085] The analysis me...

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Abstract

The invention belongs to the technical field of oil and gas field development, and particularly relates to a method for improving gasification rate of residual oil by using biological enzyme. The method comprises the following steps of (1) screening a target oil reservoir; (2) analyzing the structure of the target oil reservoir endogenous microbial community; (3) analyzing target oil deposit methanogens; (4) carrying out enrichment of methanogens; (5) optimizing the concentration of the biological enzyme; and (6) injecting a composite system in situ. The method realizes the degradation and transformation of crude oil difficult to use in a oil reservoir into methane gas, and the residual oil can be extracted for use, and can also be used as energy strategic storage, thereby further expanding the oil reservoir adaptability of a residual oil biological gasification technology. Meanwhile, the method can remarkably improve the biological gasification rate of the residual oil by over 80 percent; and meanwhile, the method has the advantages of simple process, economy, environmental protection and high input-output ratio, wherein the input-output ratio is more than 1:20.

Description

technical field [0001] The invention relates to a method for increasing the gasification rate of residual oil by using biological enzymes, belonging to the technical field of oil and gas field development. Background technique [0002] After long-term injection development, especially after tertiary oil recovery, most oil fields have generally entered the stage of high water cut development, with production decreasing year by year and development difficulty gradually increasing. At present, there are still more than 40% of the geological reserves of crude oil stranded underground, facing the outstanding problem that the existing development technology cannot be exploited economically and effectively. The reserves of low-grade oil and gas resources represented by high water cut and high recovery degree are huge, and the efficient exploitation of these resources is of great significance. [0003] Under the background of increasing difficulty in production and low oil price, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C12Q1/689C12Q1/04C12R1/01C12R1/38
CPCC12P5/023C12Q1/689Y02E50/30
Inventor 林军章冯云宋永亭郭辽原吴晓玲王新耿雪丽谭晓明陈琼瑶高光军
Owner CHINA PETROLEUM & CHEM CORP
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