A method for enhancing oil recovery by regulating the diversity of endogenous microorganisms in oil reservoirs

A technology of endogenous microorganisms and diversity, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of lack of effective control methods, reduce the diversity of endogenous microorganisms in oil reservoirs, etc., and achieve clear control ideas , Conducive to on-site promotion and application, easy to operate

Active Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention utilizes the negative correlation between the diversity of endogenous microorganisms in the oil reservoir and the oil displacement effect, and when the diversity of microorganisms in the oil reservoir shows an upward trend, by adjusting the formula of the activator, the concentration of endogenous microorganisms in the oil reservoir can be further reduced. Diversity, thereby improving the oil displacement effect of endogenous microorganisms, and at the same time, solving the problem of lack of effective control methods for the endogenous microbial oil displacement process

Method used

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  • A method for enhancing oil recovery by regulating the diversity of endogenous microorganisms in oil reservoirs
  • A method for enhancing oil recovery by regulating the diversity of endogenous microorganisms in oil reservoirs
  • A method for enhancing oil recovery by regulating the diversity of endogenous microorganisms in oil reservoirs

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Effect test

Embodiment 1

[0039] A block G in Shengli Oilfield is a medium permeability, heavy oil reservoir with a reservoir temperature of 70°C and a permeability of 500×10 -3 μm 2 , crude oil viscosity 1256mPa.s, geological reserves 124.8×10 4 t. The block includes 3 water wells and 12 oil wells. Since January, 2014, endogenous microbial oil flooding has been implemented in this block, and the method of the present invention is used to regulate and control the block. The specific steps are as follows:

[0040] (1) On-site sampling of oil reservoirs

[0041] The requirements for on-site sampling are as follows: 8 months after the on-site implementation, that is, in September 2014, the oil reservoir sampling was started to analyze the diversity of endogenous microorganisms, and the sampling was done once every two months, with a sampling volume of 10L each time; the specific steps of on-site sampling were as follows : Use a sterilized glass bottle with a rubber stopper and a screw cap to take a sa...

Embodiment 2

[0066] A block M in Shengli Oilfield is a medium permeability, heavy oil reservoir with a reservoir temperature of 63°C and a permeability of 980×10 -3 μm 2 , crude oil viscosity 2768mPa.s, geological reserves 56.3×10 4 t. The block includes 5 water wells and 18 oil wells. Since January, 2013, endogenous microbial oil flooding has been implemented in this block, and the method of the present invention is used to implement regulation and control of this block. The specific steps are as follows:

[0067] (1) On-site sampling of oil reservoirs

[0068] The requirements for on-site sampling are as follows: 9 months after the on-site implementation, that is, in October 2013, the oil reservoir sampling was started to analyze the diversity of endogenous microorganisms, and the sampling was done once every two months, with a sampling volume of 15L each time; the specific steps of on-site sampling were as follows : Use a sterilized glass bottle with a rubber stopper and a screw cap...

Embodiment 3

[0097] A block N in Shengli Oilfield is a medium permeability, heavy oil reservoir with a reservoir temperature of 75°C and a permeability of 1150×10 -3 μm 2 , crude oil viscosity 1985mPa.s, geological reserves 85.2×10 4 t. The block includes 6 water wells and 21 oil wells. Since July 2013, endogenous microbial oil displacement has been implemented in this block, and the method of the present invention has been used to regulate and control the block. The specific steps are as follows:

[0098] (1) On-site sampling of oil reservoirs

[0099]The requirements for on-site sampling are as follows: 12 months after the on-site implementation, that is, in July 2014, the oil reservoir sampling was started to analyze the diversity of endogenous microorganisms, and the sampling was done once every three months, with a sampling volume of 20L each time; the specific steps of on-site sampling were as follows : Use a sterilized glass bottle with a rubber stopper and a screw cap to take a...

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Abstract

The invention discloses a method for regulating and controlling a field implementation effect of indigenous microbial oil displacing. The method comprises the following steps that field sampling of anoil reservoir is conducted; pretreatment of samples is conducted; an indigenous microbial community structure is analyzed; indigenous microbial diversity is calculated; a preliminary regulating and controlling scheme is determined; a final regulating and controlling scheme is determined; and field implementation is conducted. The method for regulating and controlling the field implementation effect of indigenous microbial oil displacing has the characteristics of being reasonable in method, simple in technology, simple in operation, safe and reliable, low in input and low in cost, meanwhile,production performance can be regulated and controlled during the field implementation process in a targeted mode, the responding period of a field test of indigenous microbial oil displacing is effectively prolonged, and the field test effect is improved; and therefore, the method for regulating and controlling the field implementation effect of indigenous microbial oil displacing can be widely applied to the field test of improving the recovery efficiency of indigenous microbial oil displacing.

Description

technical field [0001] The invention belongs to the technical field of microbial oil recovery, and in particular relates to a method for regulating the diversity of endogenous microorganisms in oil reservoirs and improving oil recovery. Background technique [0002] Endogenous microbial flooding is to inject activators into reservoir water injection wells, and use the growth and metabolic activities and metabolites of endogenous microorganisms in the reservoir after activation to change the physical and chemical properties of crude oil and improve the fluidity of crude oil, thereby enhancing oil recovery. A comprehensive enhanced oil recovery technology. Compared with other enhanced oil recovery technologies, this technology has the advantages of wide application range, simple operation, and no pollution to the formation and the environment. [0003] At present, during the on-site implementation of endogenous microbial flooding, the composition of the activator formulation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 宋永亭胡婧刘涛高光军郭辽原李彩风宋欣冯云徐闯吴晓玲曹嫣镔
Owner CHINA PETROLEUM & CHEM CORP
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