Method for improving crude oil recovery by indigenous microorganism oil flooding

A technology of endogenous microorganisms and recovery factor, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc. It can solve the complicated and cumbersome implementation process of the screening activator process, does not consider the effect of migration and separation, and is unfavorable for on-site implementation. and other problems, to achieve the effect of saving injection volume, low mining cost, and improving activation efficiency

Inactive Publication Date: 2017-11-28
CHINA PETROLEUM & CHEM CORP +1
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this method are: (1) only the activator components were screened, without considering the migration and separation effects of different components in the core; Compared with separate injection, the activation effect is weakened; (3) The process of screening activators and implementation is complicated and cumbersome, which is not conducive to on-site implementation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for improving crude oil recovery by indigenous microorganism oil flooding
  • Method for improving crude oil recovery by indigenous microorganism oil flooding
  • Method for improving crude oil recovery by indigenous microorganism oil flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Overview of test block A of an oil production plant in Shengli Oilfield: Reservoir temperature is 60°C, reservoir pressure is 10MPa, reservoir thickness is 4m, pore volume is 5×10 4 m 3 , permeability 500×10 -3 μm 2 , the formation water salinity is 8000mg / L, the porosity is 23%, the crude oil viscosity is 300mPa·s, the comprehensive water cut is 91.2%, the recovery degree is 37%, and the well pattern is 1 injection well and 2 production wells. Utilize the method of the present invention to improve the recovery factor of this oil reservoir, concrete steps are as follows:

[0038] (1) Screening of test blocks

[0039] In test block A, the reservoir temperature is 60°C, the reservoir pressure is 10MPa, and the reservoir permeability is 500×10 -3 μm 2 , The thickness of the oil layer is 4m, the salinity of formation water is 8000mg / L, and the viscosity of crude oil is 300mPa·s. The screening criteria of the test reservoirs of the present invention are met, so the pre...

Embodiment 2

[0055] Overview of test block B of an oil production plant in Shengli Oilfield: reservoir temperature is 65°C, reservoir pressure is 10.5MPa, reservoir thickness is 4.5m, and pore volume is 7.5×10 4 m 3 , permeability 800×10 -3 μm 2 , formation water salinity is 12563mg / L, porosity is 25.0%, crude oil viscosity is 786mPa·s, comprehensive water cut is 88.0%, recovery degree is 34%, well pattern is 1 injection well and 3 production wells. Utilize the method of the present invention to improve the recovery factor of this oil reservoir, concrete steps are as follows:

[0056] (1) Screening of test blocks

[0057] In test block B, the reservoir temperature is 65°C, the reservoir pressure is 10.5MPa, and the reservoir permeability is 800×10 -3 μm 2 , The thickness of the oil layer is 4.5m, the salinity of formation water is 12563mg / L, and the viscosity of crude oil is 786mPa·s. The screening criteria of the test reservoirs of the present invention are met, so the present inven...

Embodiment 3

[0073] General situation of test block C of an oil production plant in Shengli Oilfield: Reservoir temperature is 67°C, reservoir pressure is 12.3MPa, reservoir thickness is 7m, permeability is 1200×10 -3 μm 2 , pore volume 8.2×10 4 m 3 , formation water salinity is 7658mg / L, porosity is 32.5%, crude oil viscosity is 1256mPa·s, comprehensive water cut is 95.3%, recovery degree is 36.5%, well pattern is 1 injection well and 4 production wells. Utilize the method of the present invention to improve the recovery factor of this oil reservoir, concrete steps are as follows:

[0074] (1) Screening of test blocks

[0075] In test block C, the reservoir temperature is 67°C, the reservoir pressure is 12.3MPa, and the reservoir permeability is 1200×10 -3 μm 2 , The thickness of the oil layer is 7m, the salinity of formation water is 7658mg / L, and the viscosity of crude oil is 1256mPa·s. The screening criteria of the test reservoirs of the present invention are met, so the present ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the technical field of tertiary oil recovery and concretely relates to a method for improving crude oil recovery by indigenous microorganism oil flooding. The method comprises the following steps of sieving a test oil reservoir, sieving an activator, determining an activator chromatogram separating effect, determining on-site injection technology, testing on-site and conducting statistic and analysis to the on-site test effect. A way of separate injection due to different activator components is applied, so a traditional way of mixed injection of the activators can be broken and chromatogram effect of migration and absorption of different components of the activator in the oil reservoir can be eliminated; an injection amount of the activator can be reduced and cost can be therefore lowered; indigenous microorganism functional bacteria of different types can be activated and activation effect of the activator can be improved, so microorganism oil flooding effect can be further enhanced; and therefore, the method for improving crude oil recovery by indigenous microorganism oil flooding can be widely applied to microorganism improving recovery on-site tests.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a method for increasing oil recovery by endogenous microbial flooding. Background technique [0002] Endogenous microbial flooding refers to the use of microorganisms in the oil reservoir to activate the microorganisms by injecting activators into the water injection well, and to use the surface active substances and biogas produced by the microorganisms themselves and their metabolism to increase crude oil production and recovery. It is an environmentally friendly and low-cost mining technology. [0003] The activator of endogenous microbial flooding is mainly composed of three parts: carbon source, nitrogen source and phosphorus source. In the process of field implementation, the activator is mixed and then injected into the reservoir. Due to the adsorption and retention of the activator when it migrates in the reservoir Moreover, studies have shown t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityApplications(China)
IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor李希明刘涛姜亦栋胡婧李彩风巴燕汪刚跃赵凤敏吴晓玲宋永亭
OwnerCHINA PETROLEUM & CHEM CORP