Screening method of indigenous microbe activator with profile control function

A technology of endogenous microorganisms and screening methods, which is applied in the field of screening of endogenous microorganism activators, can solve problems such as limited sweep volume and influence on field test results of endogenous microorganism flooding, and achieve simple methods, enhanced oil recovery, Actionable and targeted effects

Inactive Publication Date: 2015-04-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the main oilfields in China have entered the stage of high water cut after long-term water injection development. In microbial flooding, the injected activator is a soluble source of carbon, nitrogen, and phosphorus. Although it can effectively activate the growth and metabolism of endogenous microorganisms in the reservoir and improve the recovery of crude oil, due to the strong solubility of this type of activator, it is difficult to The above oil reservoirs mainly migrate along the dominant large pores, resulting in limited swept volume. Therefore,
[0004] To a certain extent, the range of enhanced oil recovery is limited, which affects the field test effect of endogenous microbial flooding

Method used

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  • Screening method of indigenous microbe activator with profile control function
  • Screening method of indigenous microbe activator with profile control function
  • Screening method of indigenous microbe activator with profile control function

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Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: Take Shengli Oilfield G 3 Reservoir as an example

[0033] G 3 Reservoir, plane heterogeneity is serious, coefficient of variation of permeability is 0.54, reservoir permeability is 2500×10 -3 μm 2 , with a porosity of 35%, is a high-porosity and high-permeability reservoir with a reservoir temperature of 70°C and a pressure of 10.3MPa. This reservoir has been developed for 30 years with water flooding and polymer flooding, with a recovery rate of 53% and a water cut of the produced fluid reaching 96%. Implement the concrete steps of the present invention as follows:

[0034] 1. Screening of endogenous microbial activator carbon source

[0035] The carbon source screening of endogenous microbial activators includes viscosity evaluation, blockage adjustment ability evaluation and activation ability evaluation. The specific evaluation methods are as follows:

[0036] ① Viscosity evaluation

[0037] Select the activator carbon source cassava flour, car...

Embodiment 2

[0083] Example 2: Taking a certain oil reservoir Z in Shengli Oilfield 2 as an example

[0084] Reservoir Z 2 , reservoir permeability 1200×10 -3 μm 2 , porosity 35%, reservoir temperature 60°C, pressure 9.2MPa, this reservoir has been developed by water flooding for 25 years, the recovery degree is 41%, and the water content of the produced fluid reaches 95%. Implement the steps of the present invention as follows:

[0085] 1. Screening of endogenous microbial activator carbon source

[0086] The carbon source screening of endogenous microbial activators includes viscosity evaluation, blockage adjustment ability evaluation and activation ability evaluation. The specific evaluation methods are as follows:

[0087] ① Viscosity evaluation

[0088] Select the activator carbon source hydroxypropyl guar gum, cellulose polysaccharide and sphingosine gum, fully dissolve to Z at a concentration of 0.3%. 2 Viscosity test was carried out in the reservoir produced fluid, and the t...

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Abstract

The invention belongs to the technical field of microbe oil extraction and relates to a screening method of an indigenous microbe activator with a profile control function. The screening method comprises the following steps of 1, screening an indigenous activator carbon source according to specific oil reservoir, 2, carrying out activator phosphor source and nitrogen source screening, activator injection capability evaluation, activator concentration and injection amount optimization, and activator oil displacement effect evaluation, and screening an activator, and 3, carrying out on-site test and effect tracking according to the screened activator. The screening method has strong pertinency and is suitable for water-flooding development of heterogeneous reservoir. The screened activator has a low cost, is environmentally friendly and has no follow-up water treatment problems. The screening method has good on-site test effects and improves an extraction ratio by more than 10%. Therefore, the screening method can be widely used in the on-site test of improving an extraction ratio of reservoir water-flooding development.

Description

1. Technical field [0001] The invention belongs to the technical field of microbial oil recovery, and in particular relates to a screening method for an endogenous microbial activator with a profile control function. 2. Background technology [0002] Endogenous microbial flooding technology can significantly improve oil recovery, and has the characteristics of low cost and easy operation, and has broad application prospects. [0003] At present, most of the main oilfields in China have entered the stage of high water cut after long-term water injection development. In microbial flooding, the injected activator is a soluble source of carbon, nitrogen, and phosphorus. Although it can effectively activate the growth and metabolism of endogenous microorganisms in the reservoir and improve the recovery of crude oil, due to the strong solubility of this type of activator, it is difficult to The above oil reservoirs mainly migrate along the dominant large pores, resulting in limit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N11/00
Inventor 曹嫣镔李彩风胡婧冯云杜春安徐鹏王刚徐闯潘永强王静宋永亭
Owner CHINA PETROLEUM & CHEM CORP
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