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Method of microorganism wax removing and preventing of high-temperature and high-salinity high-wax-bearing oil well

A high-temperature, high-salt, microbial technology, used in cleaning appliances, earth-moving drilling, wellbore/well components, etc., can solve problems such as large differences in microbial metabolic activity and quantity, difficult to form competitive dominant bacteria, and discounted application effects. , to achieve the effect of low cost, wide application range and long effect period

Inactive Publication Date: 2018-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming and deficiency of this invention are: what is used is a single bacterial agent, and the problem that it exists is that there are many kinds of miscellaneous bacteria surviving in the oil reservoir, which is affected by the environment of the oil reservoir, especially temperature, dissolved oxygen, redox potential and nutrition. Due to the limitation of various microorganisms, the metabolic activity and quantity of various microorganisms are quite different, making it difficult for a single microbial agent to form competitive dominant bacteria in the oil reservoir, so its application effect will be greatly reduced
The disadvantages and shortcomings of this invention are: the temperature resistance of the composite bacterial agent is poor, especially the salt resistance, therefore, the invention is not suitable for high temperature, high salt, waxy oil wells; different oil wells should select different bacteria in a targeted and differential manner. agent, as well as the injection amount and dosing cycle of different bacterial agents, on the one hand, it can improve the utilization rate of the bacterial agent and reduce the cost, and on the other hand, it can improve the wax-removing and anti-wax effect of the bacterial agent

Method used

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  • Method of microorganism wax removing and preventing of high-temperature and high-salinity high-wax-bearing oil well
  • Method of microorganism wax removing and preventing of high-temperature and high-salinity high-wax-bearing oil well
  • Method of microorganism wax removing and preventing of high-temperature and high-salinity high-wax-bearing oil well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Oil well A in an oil field 3 , reservoir temperature 75℃, permeability 750×10 -3 μm 2 , the wax content of the crude oil is 23.2%, the thickness of the oil layer is 3.4m, the salinity of the formation water is 89563mg / L, and the daily fluid of the well is 80m before the test 3 , the daily oil production is 3.5t, the water content is 95.6%, and the method of the present invention is used in the oil well A 3 The implementation of the field test, the specific implementation steps are as follows:

[0041] (1) Screening of oil wells

[0042] Well A 3 Reservoir temperature≤95℃, permeability≥50×10 -3 μm 2 , the salinity of formation water is less than or equal to 150000mg / L, and the wax content of crude oil is less than or equal to 30%, which meet the screening standards of the present invention.

[0043] (2) Screening of microbial wax remover and inhibitor

[0044] The screening method of microbial wax remover and inhibitor is as follows: ① Field sampling of test oil ...

Embodiment 2

[0057] Oil well B in an oil field 12 , reservoir temperature 87℃, permeability 980×10 -3 μm 2 , the wax content of the crude oil is 26.8%, the thickness of the oil layer is 8.5m, the salinity of the formation water is 125600mg / L, and the daily liquid of the well before the test is 95m 3 , the daily oil production is 4.3t, the water content is 95.5%, and the method of the present invention is used in the oil well B 12 The implementation of the field test, the specific implementation steps are as follows:

[0058] (1) Screening of oil wells

[0059] Well B 12 Reservoir temperature≤95℃, permeability≥50×10 -3 μm 2 , the salinity of formation water is less than or equal to 150000mg / L, and the wax content of crude oil is less than or equal to 30%, which meet the screening standards of the present invention.

[0060] (2) Screening of microbial wax remover and inhibitor

[0061] The screening method for microbial wax remover and inhibitor is as follows: ① Field sampling of tes...

Embodiment 3

[0074] Oil well F in an oil field 21 , reservoir temperature 82℃, permeability 630×10 -3 μm 2 , the wax content of the crude oil is 18.3%, the thickness of the oil layer is 6.3m, the salinity of the formation water is 114560mg / L, and the daily fluid of the well before the test is 63m 3 , the daily oil production is 4.0t, the water content is 93.7%, and the method of the present invention is used in the oil well F 21 The implementation of the field test, the specific implementation steps are as follows:

[0075] (1) Screening of oil wells

[0076] Well F 21 Reservoir temperature≤95℃, permeability≥50×10 -3 μm 2 , the salinity of formation water is less than or equal to 150000mg / L, and the wax content of crude oil is less than or equal to 30%, which meet the screening standards of the present invention.

[0077] (2) Screening of microbial wax remover and inhibitor

[0078] The screening method of microbial wax remover and inhibitor is as follows: ① Field sampling of test ...

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Abstract

The invention relates to a microorganism oil recovery method, in particular to a method of microorganism wax removing and preventing of a high-temperature and high-salinity high-wax-bearing oil well.The method comprises the following steps that (1) a test oil well is screened; (2) a microorganism wax removing and preventing agent is screened; (3) a field construction technology is selected; (4) afield test is conducted; and (5) the effect is evaluated. According to the method of microorganism wax removing and preventing of the high-temperature and high-salinity high-wax-bearing oil well, theproblems that the using amount is high, the cost is high, and the safety and environmental protection performance is poor due to the fact that a traditional chemical wax removing and preventing agentis used can be solved, the method has the advantages that the reliability is high, the application range is wide, and no environmental pollution is generated, and meanwhile the method further has theadvantages that the cost is low, the action period is long, and the economic benefit is high. Thus, the method can be widely applied to microorganism wax removing and preventing of the wax-bearing oil well.

Description

technical field [0001] The invention belongs to a method for removing and preventing wax in the field of petroleum exploitation, in particular to a method for removing and preventing wax by microorganisms in a high-temperature, high-salt, and high-wax oil well. Background technique [0002] In the process of oil exploitation, with the decrease of wellbore temperature and pressure, the waxy components in crude oil often precipitate, grow and deposit in the tubing, thus forming oil well paraffin, which seriously affects the normal production of oil wells. Therefore, effective measures must be taken to control the wax deposition in oil wells. [0003] At present, the methods of controlling oil well wax precipitation mainly include physical method, chemical method and microbial method. However, the physical method has disadvantages such as high cost and great damage to the formation. [0004] Microbial method is a technology that uses microbial wax remover to remove wax from o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/06
Inventor 吴晓玲徐登霆王静林军章胡婧孙刚正高光军汪刚跃冯云谭晓明曹功泽
Owner CHINA PETROLEUM & CHEM CORP
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