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A method for microbial wax removal and prevention in high waxy oil wells

A technology for removing wax and microorganisms, applied in earthwork drilling, cleaning tools, wellbore/well parts, etc., can solve the problems of poor pertinence and operability, and no design basis for the design of injection cycle, etc., to achieve Wide range of applications, saving hot cleaning times, and the effect of reducing wax content

Active Publication Date: 2019-10-18
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 waxy oil well B in a block of Shengli Oilfield 12 , reservoir temperature 75℃, wax content 37.2%, formation water salinity 32562mg / L, permeability 950×10 -3 μm 2 , 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 15d, the single well is hot washed 24 times per year, the well depth is 1250m, and the fluid level is 120m. Utilize the method of the present invention to implement field test in this high-wax oil well, and the specific implementation steps are as follows:

[0039] 1. Screening of test wells

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

[0041] 2. The selection of microorganisms to remove wax and prevent wax

[0042] The opt...

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 liquid surface 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 preventi...

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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 microbial wax removal and prevention of high wax-containing 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, accumulate and deposit on the pipe wall as crystals, that is, the phenomenon of wax precipitation occurs. Waxing of oil pipes, sucker rods and oil well pumps increases the load of oil pumping units, reduces pumping efficiency, decreases production, reduces productivity, and even causes oil wells to stop production. Due to severe wax deposition, the maintenance operations of oil wells account for a large proportion, and the workover costs increase. Mechanical wax removal, oil well hot cleaning and chemical wax removal are currently three traditional wax removal and prevention measures for waxy oil wells, but the...

Claims

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Application Information

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Patent Type & Authority Patents(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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