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Effect evaluation method for microbial paraffin removing and inhibiting of oil well

A microbial treatment and evaluation method technology, which is applied in the field of effect evaluation of oil well microbial wax removal and prevention treatment, can solve the problems that restrict the large-scale promotion and application of microbial wax removal and prevention technology, small adaptable range, and low accuracy, and achieve the scale of promotion The effect of popularization, application and development, wide application range and high accuracy

Inactive Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although microbial paraffin removal and anti-paraffin technology has many advantages in technology, economy, safety and environmental protection, there is no clear and effective method for on-site monitoring and operation effect evaluation in the specific oil well microbial paraffin removal and anti-paraffin treatment process. The application of wax control technology is difficult to obtain scientific and accurate evaluation, which seriously affects and restricts the large-scale promotion and application of microbial wax removal and control technology
After literature search, the patent number is "ZL201210078176.x", and the patent name is "a monitoring method for oil well microbial wax removal and control", (1) collection of oil well output fluid samples; (2) oil well output fluid sample collection Pretreatment; (3) Determination of the number of petroleum hydrocarbon-degrading bacteria in the water samples of the oil well output fluid; (4) Data analysis and effect evaluation: the determination of the petroleum hydrocarbon-degrading bacteria in the output fluid water samples at different times was obtained through the step (3) By comparing the bacterial counts of petroleum hydrocarbon degrading bacteria in the output liquid water sample before and after the microbial wax removal and control operation of the oil well, the effect of its microbial wax removal and control operation can be judged, but this method has the following shortcomings and deficiencies: ( 1) The accuracy is not high. Even if the number of petroleum hydrocarbon-degrading bacteria in different waxy oil wells changes to the condition of B-A≥3 in this invention, it can only indicate that the petroleum hydrocarbon-degrading bacteria have grown and reproduced in the oil well, and because the oil wells contain different waxes There is a big difference in the effect of wax removal and control caused by the amount of oil and reservoir temperature. Therefore, it is not accurate to judge the effect of wax removal and control in oil wells only with the change of the number of petroleum hydrocarbon degrading bacteria as the only indicator; (2) This method has a small scope of application. This method is only suitable for evaluating the effect of microbial wax removal, but not suitable for the evaluation of microbial wax control effect.

Method used

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Experimental program
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Effect test

Embodiment 1

[0026] Oil well 7-12 in a certain block of Xianhe Oil Production Plant of Shengli Oilfield had severe wax deposition. Before adopting microbial wax removal and anti-wax technology, the well was washed with hot water to remove wax. The average hot washing cycle was 14 days and the average load was 25.6kN.

[0027] It is planned to use microbial wax removal and control for this well and evaluate the effect of microbial wax removal and control treatment. The specific steps are as follows:

[0028] (1) Hot washing of waxy oil wells

[0029] The oil wells are hot-washed 8 days before the microbial treatment, and the hot water consumption of each oil well is 15m 3 , the temperature of the hot water is 92°C.

[0030] (2) On-site sampling, pretreatment and wax content determination before and after oil well microbial treatment

[0031] On-site sampling was carried out within 6 months before the microbiological treatment of the oil well, and on-site sampling was carried out in the 6t...

Embodiment 2

[0043] Oil well 3-11 in a block of Hekou Oil Production Plant of Shengli Oilfield had severe wax deposition. Before adopting microbial wax removal and anti-wax technology, the well was washed with hot water to remove wax. The average hot washing cycle was 18 days and the average load was 32.8kN.

[0044] It is planned to use microbial wax removal and control for this well and evaluate the effect of microbial wax removal and control treatment. The specific steps are as follows:

[0045] (1) Hot washing of waxy oil wells

[0046] The oil wells are hot-washed 10 days before the microbial treatment, and the hot water consumption of each oil well is 20m 3 , the temperature of the hot water is greater than 95°C.

[0047] (2) On-site sampling, pretreatment and wax content determination before and after oil well microbial treatment

[0048] On-site sampling was carried out within 6 months before the microbial treatment of the oil well, and on-site sampling was carried out at the fif...

Embodiment 3

[0060] Well 9-08 in a certain block of Chunliang Oil Production Plant of Shengli Oilfield had severe wax deposition. Before adopting microbial wax removal and prevention technology, the well was washed with hot water to remove wax. The average hot washing cycle was 25 days and the average load was 27.8kN.

[0061] It is planned to use microbial wax removal and control for this well and evaluate the effect of microbial wax removal and control treatment. The specific steps are as follows:

[0062] (1) Hot washing of waxy oil wells

[0063] The oil wells are hot-washed 9 days before the microbial treatment, and the hot water consumption of each oil well is 18m 3 , the temperature of the hot water is 98°C.

[0064] (2) On-site sampling, pretreatment and wax content determination before and after oil well microbial treatment

[0065] On-site sampling was carried out within 6 months before the microbial treatment of the oil well, and the on-site sampling was carried out in the 6th...

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Abstract

The invention discloses an effect evaluation method for microbial paraffin removing and inhibiting of an oil well, and belongs to the technical field of tertiary oil recovery. The effect evaluation method is characterized by comprising the following steps: (1) hot washing the paraffin-containing oil well; (2) field sampling, pretreating and measuring the paraffin content before and after oil well microbial treatment; (3) analyzing and counting the hot washing cycle before and after the oil well microbial treatment; (4) determining the load before and after the oil well microbial treatment; (5) carrying out data analysis and effect evaluation. The effect evaluation method is to determine the crude oil paraffin content, the hot washing cycle and load of the oil well before and after the microbial paraffin removing and inhibiting of the oil well and judge the microbial paraffin removing and inhibiting effect, so as to enable the treatment effect of the microbial paraffin removing and inhibiting technology of the oil well to be evaluated scientifically, reliably and accurately and facilitate development and field application of the microbial paraffin removing and inhibiting technology.

Description

1. Technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to an effect evaluation method of oil well microbial wax removal and prevention treatment. 2. Background technology [0002] Waxing in oil wells is a prominent problem that seriously affects oil well production, and wax prevention and removal are important tasks in oil well production management. Microbial wax removal and anti-wax technology adopts the method of adding high-efficiency bacteria agent. Oil well microbial wax removal and anti-wax agent is a mixture of petroleum hydrocarbon-degrading bacteria composed of various aerobic and facultative anaerobic bacteria. These mixed bacteria are isolated from the production fluid of high waxy oil wells, and they can use the waxy components in crude oil as the only carbon source for growth and reproduction. When the bacterial agent is injected into the oil well, the mixed bacteria will metabolize the waxy c...

Claims

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Application Information

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IPC IPC(8): C12Q1/02
Inventor 曹嫣镔刘涛胡婧徐登霆段传慧徐鹏郭辽原王静宋欣巴燕曹功泽张守献
Owner CHINA PETROLEUM & CHEM CORP