A method for endogenous microbial oil recovery in medium and high permeability reservoirs

An endogenous microorganism, medium and high permeability technology, applied in chemical instruments and methods, production fluids, earthwork drilling, etc. The effect of water flooding sweeping volume, improving utilization rate and improving effect

Active Publication Date: 2019-07-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following problems: the activators are all injected from the water well at the same time, and the injection of production differentiation is not realized according to the permeability of the oil layer, resulting in the waste of biosurfactant functional bacteria or activators injected into the high permeability layer, and at the same time Functional microorganisms or activators injected into low-permeability layers to produce biopolymers cause plugging of low-permeability layers, which further aggravates the heterogeneity of the reservoir, thus affecting the field test results to a certain extent

Method used

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  • A method for endogenous microbial oil recovery in medium and high permeability reservoirs
  • A method for endogenous microbial oil recovery in medium and high permeability reservoirs
  • A method for endogenous microbial oil recovery in medium and high permeability reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In block E of an oilfield, the reservoir temperature is 68°C and the permeability is 1200×10 -3 um 2 , porosity 34.4%, crude oil viscosity 1250mPa.s, geological reserves 3.60×10 4 t, the salinity of the formation water is 7852mg / L, the average water content of the block before the test is 97.2%, and the content of bifidobacteria in the formation water is 2.1×10 2 Individual / ml, Bacillus subtilis content 1.1×10 3 individuals / ml and the content of methanogens was 3.5×10 2 unit / ml, block oil layer parameters and corresponding water wells are shown in Table 1.

[0046] Table 1 Block E reservoir parameters and corresponding wells

[0047] serial number layers Permeability, 10 -3 um 2

Oil layer thickness, m Corresponding well 1 E 1

2100 3.2 E 11

2 E 2

500 2.3 E 21

3 E 3

1100 3.0 E 31

[0048] Utilize the method of the present invention to implement endogenous microorganism flooding oil in block E, concr...

Embodiment 2

[0079]In an oilfield block G, the reservoir temperature is 75°C, and the permeability is 1300×10 -3 um 2 , porosity 33.2%, crude oil viscosity 1560mPa.s, geological reserves 4.20×10 4 t, the salinity of the formation water is 2365mg / L, the average water content of the block before the test is 95.6%, and the content of bifidobacteria in the formation water is 3.5×10 2 Individual / ml, Bacillus licheniformis content 1.1×10 3 Individuals / ml, Pseudomonas content is 3.5×10 2 each / ml, the content of Lactobacillus is 2.1×10 3 individual / ml and the content of methanogens is 1.0×10 3 unit / ml, block oil layer parameters and corresponding water wells are shown in Table 3.

[0080] Table 3 Block G reservoir parameters and corresponding water wells

[0081]

[0082]

[0083] Utilize the method of the present invention to implement endogenous microorganism flooding oil in block G, concrete implementation steps are as follows:

[0084] (1) Reservoir screening

[0085] In block G,...

Embodiment 3

[0118] In an oilfield block H, the reservoir temperature is 80°C, and the permeability is 1300×10 -3 um 2 , porosity 34.0%, crude oil viscosity 986mPa.s, geological reserves 3.20×10 4 t, the salinity of the formation water is 9860mg / L, the average water content of the block before the test is 96.0%, and the content of Streptococcus thermophilus in the formation water is 1.1×10 3 Individual / ml, Bacillus subtilis content 2.1×10 2 Individual / ml, Lactobacillus 7.5×10 2 Individuals / ml and hydrocarbon oxidizing bacteria content is 3.0×10 2 unit / ml, block oil layer parameters and corresponding water wells are shown in Table 5.

[0119] Table 5 Block H reservoir parameters and corresponding water wells

[0120]

[0121]

[0122] Utilize the method of the present invention to implement endogenous microorganism flooding oil in block H, concrete implementation steps are as follows:

[0123] (1) Reservoir screening

[0124] In Block H, the reservoir temperature is less than 9...

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and particularly relates to an indigenous microorganism oil recovery method of a medium to high permeable oil reservoir. The indigenous microorganism oil recovery method specifically comprises the following steps that an oil reservoir is screened; indigenous microorganisms are analyzed; an activating agent is screened; a fieldinjection technology is optimized; and a field test is conducted and the effect is evaluated. The indigenous microorganism oil recovery method has the advantages that the technology is simple, the pertinence and the maneuverability are high, the mining cost is low, and subsequent treatment is not needed, and field application and promotion are facilitated; meanwhile, different injection technologies are adopted aiming at the difference of the oil layer penetration rates, the using amount of the injection agents can be effectively saved, meanwhile the use ratio of injected water is increased, the water driving wave and the volume are expanded, so that the development effect of water driving is improved, the field test enhanced oil recovery is larger than 15%, and the input-output ratio is larger than 1:5. Thus, the indigenous microorganism oil recovery method can be widely applied to the technical field of microorganism oil recovery.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a method for oil recovery by endogenous microorganisms in medium and high permeability oil reservoirs. Background technique [0002] Endogenous microbial oil recovery technology refers to the use of activators injected from water wells to activate functional microorganisms in oil reservoirs, such as biosurfactants, biopolymers, etc., and use functional microorganisms and their metabolites to improve crude oil production and recovery. Compared with other tertiary oil recovery technologies, endogenous microbial oil recovery technology has the characteristics of wide application range, simple process, good economic benefits, and no pollution, and has good application prospects, so it has received more and more attention. [0003] Due to the long-term water flooding development of medium and high permeability reservoirs, local large pores have been formed, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22C09K8/582
Inventor 曹嫣镔汪卫东孙刚正汤晓东胡婧宋欣段传慧冯云耿雪丽谭晓明吴晓玲徐闯高光军赵凤敏宋永亭
Owner CHINA PETROLEUM & CHEM CORP
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