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A method for microbial wax removal and control in waxy oil wells

A technology for removing wax and preventing microorganisms, which is used in earth-moving drilling, cleaning tools, wellbore/well components, etc. It can solve problems such as affecting the effect of wax removal and preventing and cannot adapt to temperature changes, and achieves good field test results and reservoirs. Wide range of applications and strong operability

Active Publication Date: 2022-04-12
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 wax removal and control system only has one kind of wax control bacteria, and the optimum growth temperature is 37°C, which cannot adapt to the temperature change from the wellhead to the bottom of the well, which affects the wax removal and control effect

Method used

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  • A method for microbial wax removal and control in waxy oil wells
  • A method for microbial wax removal and control in waxy oil wells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] High wax oil well C in a block of Shengli Oilfield 2 , the reservoir temperature is 72°C, the wax content is 35.0%, the formation water salinity is 25635mg / L, and the daily fluid production of the oil well is 60m 3 , before the test, the water cut was 93.5%, the well depth was 1500m, the bottom hole temperature was 85°C, the wellhead temperature was 25°C, the hot washing cycle was 20 days, and the average annual hot washing time of a single well was 18 wells. Utilize method of the present invention to implement field test in this high waxy oil well, concrete implementation steps are as follows:

[0041] (1) Screening of test wells

[0042] Test well C 2The reservoir temperature is 72°C, the formation water salinity is 25635mg / L, the water cut is 93.5%, and the wax content is 35.0%. The present invention can be practiced in the well that meets the screening criteria of the present invention.

[0043] (2) Determination of the temperature range of low, medium and high ...

Embodiment 2

[0066] High wax oil well C in a block of Shengli Oilfield 5 , the reservoir temperature is 82°C, the wax content is 37.3%, the formation water salinity is 21232mg / L, and the daily fluid production of the oil well is 100m 3 , before the test, the water cut was 94.2%, the well depth was 1650m, the bottom hole temperature was 91°C, the wellhead temperature was 25°C, the hot washing cycle was 30 days, and the single well was hot washed 12 times per year on average. Utilize method of the present invention to implement field test in this high waxy oil well, concrete implementation steps are as follows:

[0067] (1) Screening of test wells

[0068] Test well C 5 The reservoir temperature is 82°C, the formation water salinity is 21232mg / L, the water content is 94.2%, and the wax content is 37.3%. The present invention can be practiced in the well that meets the screening criteria of the present invention.

[0069] (2) Determination of the temperature range of low, medium and high ...

Embodiment 3

[0093] High wax oil well C in a block of Shengli Oilfield 8 , the reservoir temperature is 65°C, the wax content is 35.7%, the formation water salinity is 45268mg / L, and the daily fluid production of the oil well is 40m 3 , before the test, the water cut was 93.2%, the well depth was 1250m, the bottom hole temperature was 70°C, the wellhead temperature was 25°C, the hot washing cycle was 20 days, and the average annual hot washing time of a single well was 18 wells. Utilize method of the present invention to implement field test in this high waxy oil well, concrete implementation steps are as follows:

[0094] (1) Screening of test wells

[0095] Test well C 8 The reservoir temperature is 65°C, the formation water salinity is 45268mg / L, the water content is 93.2%, 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.

[0096] (2) Determination of the temperature range of low, medium and hi...

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Abstract

The invention belongs to the technical field of oilfield development, and in particular relates to a method for removing and preventing wax by microbes in waxy oil wells. The method specifically includes the following steps: screening of test oil wells; determination of the temperature range of low, medium and high temperature strains; screening of low, medium and high temperature strains; determination of compound performance of low, medium and high temperature strains; The determination of the on-site dosing ratio, the total dosage and the dosing cycle; the field test and the evaluation of the effect. The invention has the advantages of simple process, strong operability and good field test effect, effectively prolongs the hot cleaning cycle by more than 200 days, saves more than 5 hot cleaning times per year on average for a single well, and has an input-output ratio greater than 1:5. Therefore, the present invention can be widely used in the wax removal and prevention operations of high waxy oil wells.

Description

technical field [0001] The invention belongs to the technical field of oilfield development, and in particular relates to a method for removing and preventing wax by microbes in waxy oil wells. Background technique [0002] During oil production, as the wellbore temperature and pressure drop, the waxy components in crude oil will precipitate, grow and deposit in the tubing, which will lead to wax formation in the oil well and seriously affect the normal production of the oil well. Therefore, effective measures must be taken to control oil well wax deposition. [0003] At present, the methods for controlling wax deposition in oil wells mainly include physical methods, chemical methods, and microbial wax removal and prevention methods. However, the physical method has the disadvantages of high cost and great damage to the oil pipe; the chemical method (mainly including chemical wax remover and chemical wax inhibitor) has the disadvantages of large dosage, high cost, and poor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B37/06
CPCE21B37/06
Inventor 吴晓玲徐登霆冯云王静胡婧郭辽原徐闯李彩风王新林军章
Owner CHINA PETROLEUM & CHEM CORP
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