Microbial paraffin removing and preventing method for high wax content oil well

A technology for removing wax and preventing microorganisms, which can be used in cleaning tools, earth-moving drilling, wellbore/well components, etc. It can solve problems such as poor pertinence and operability, and no design basis for the design of injection cycle. Wide range of applications, saving hot flushing times, and strong operability

Active Publication Date: 2017-10-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the optimization of the injection volume of the microbial wax remover and preventive agent is not involved, and the design of the injection cycle does not provide a design basis. Therefore, the invention is not very pertinent and operable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] High wax oil well B in a block of Shengli Oilfield 12 , the reservoir temperature is 75°C, the wax content is 37.2%, the formation water salinity is 32562mg / L, and the permeability is 950×10 -3 μm 2 1. The thickness of the oil layer is 12.0m, the porosity is 0.325, the water content of the well is 93.2% before the test, the hot washing cycle is 15 days, the hot washing time of a single well is 24 wells per year, the well depth is 1250m, and the dynamic liquid surface is 120m. Utilize method of the present invention to implement field test in this high waxy oil well, concrete implementation steps are as follows:

[0039] 1. Screening of test wells

[0040] The oil layer temperature of the test oil well is 75°C, the formation water salinity is 32562mg / L, the water content is 93.2%, and the wax content is 37.2%. The present invention can be practiced in the well that meets the screening criteria of the present invention.

[0041] 2. Selection of microorganisms for clea...

Embodiment 2

[0067] High wax oil well B in a block of Shengli Oilfield 23 , the reservoir temperature is 72°C, the wax content is 35.7%, the formation water salinity is 12560mg / L, and the permeability is 800×10 -3 μm 2 1. The thickness of the oil layer is 11.5m, the porosity is 0.323, the water content of the well is 93.8% before the test, the hot washing cycle is 20 days, the hot washing time of a single well is 18 wells per year, the well depth is 2856m, and the dynamic fluid surface is 245m. Utilize method of the present invention to implement field test in this high waxy oil well, concrete implementation steps are as follows:

[0068] 1. Screening of test wells

[0069] The oil layer temperature of the test oil well is 72°C, the formation water salinity is 12560mg / L, the water content is 93.8%, and the wax content is 35.7%. The present invention can be practiced in the well that meets the screening criteria of the present invention.

[0070] 2. Selection of microorganisms for clear...

Embodiment 3

[0096] High wax oil well B in a block of Shengli Oilfield 32 , the reservoir temperature is 68°C, the wax content is 32.8%, the formation water salinity is 17856mg / L, and the permeability is 1000×10 -3 μm 2 , The thickness of the oil layer is 25.3m, the porosity is 0.318, the water content of the well is 91.7% before the test, the hot washing cycle is 10 days, the hot washing time is 36 wells per year, the well depth is 1980m, and the dynamic fluid level is 150m. Utilize method of the present invention to implement field test in this high waxy oil well, concrete implementation steps are as follows:

[0097] 1. Screening of test wells

[0098] The oil layer temperature of the test oil well is 68°C, the formation water salinity is 17856mg / L, the water content is 91.7%, and the wax content is 32.8%. The present invention can be practiced in the well that meets the screening criteria of the present invention.

[0099] 2. Selection of microorganisms for clearing and preventing ...

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PUM

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Abstract

The invention belongs to the technical field of oilfield chemistry, and particularly relates to a microbial paraffin removing and preventing method for a high wax content oil well. The microbial paraffin removing and preventing method comprises the following steps that screening of a test oil well is conducted; optimization of microbial paraffin removing and preventing bacteria is conducted; the dilution capacity of the microbial paraffin removing and preventing bacteria is evaluated; field dosage is determined; the dosing timing is determined; and the field test and the effect are evaluated. According to the microbial paraffin removing and preventing method for the high wax content oil well, scientific basis is provided for determination of the bacteria adding amount and the bacteria adding timing of the test oil well; and meanwhile the method has the characteristics that the application range of an oil deposit is wide, the technology is simple, the operability is high, and the field testing effect is good, the hot washing period is effectively prolonged by over 200 d, and over five times of well hot washing of a single well are saved every year. In this way, the method can be widely applied to paraffin removing and preventing operation for the high wax content oil well.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a method for removing and preventing wax by microorganisms in high-wax oil wells. Background technique [0002] In the process of crude oil extraction, with the decrease of temperature and the precipitation of gas, paraffin will precipitate, grow up, gather and deposit on the pipe wall in the form of crystals, that is, wax deposition occurs. Wax deposits on tubing, sucker rods and pumps increase the load of pumping units, reduce pump efficiency, reduce production, reduce productivity, and even cause oil wells to stop production. The oil well maintenance operations caused by severe waxing account for a large proportion, and the workover costs increase. At the same time, the waxing of the sucker rod causes the long-term overload operation of the sucker rod, which also affects the effective service life of the sucker rod. Mechanical wax removal, oil well ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/06
Inventor 吴晓玲王志坚杨斌徐登霆王静冯云王新刘涛段传慧曹功泽
Owner CHINA PETROLEUM & CHEM CORP
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