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Low-permeability oil reservoir bio-based microemulsion plug removal and augmented injection system and injection process thereof

A bio-based, microemulsion technology, applied in drilling compositions, wellbore/well components, chemical instruments and methods, etc., can solve the problems of poor salt resistance of anions, use restrictions, environmental pollution, etc., and achieve economical Considerable, reduce injection pressure, improve the effect of dissolution rate

Pending Publication Date: 2022-08-05
DAQING HUALI ENERGY BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Many scholars at home and abroad have studied the development of low-permeability oilfields, but there are few studies on microemulsion flooding in low-permeability reservoirs. At present, the surfactants used in oilfields at home and abroad are mainly anionic surfactants based on sodium salts and non-ionic surfactants. Ionic surfactants, however, have poor anionic salt resistance, and some nonionic surfactants are sensitive to temperature and have certain pollution to the environment, so there are some restrictions on their use

Method used

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  • Low-permeability oil reservoir bio-based microemulsion plug removal and augmented injection system and injection process thereof
  • Low-permeability oil reservoir bio-based microemulsion plug removal and augmented injection system and injection process thereof
  • Low-permeability oil reservoir bio-based microemulsion plug removal and augmented injection system and injection process thereof

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Experimental program
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Effect test

Embodiment 1

[0016] The present invention has a low-permeability oil reservoir bio-based microemulsion plug-removing and increasing injection system, which is made of the following components: bio-based surfactant is 0.5%, NaCl is 0.8%; kerosene is 1%; butanol is 0.5% %; the balance is water. Among them, the bio-based surfactant is made of a bio-based surfactant and a lipopeptide surfactant in a ratio of 2:1, and the bio-based surfactant is N,N-diacetic acid-N'-phenyl ten Octacyl-ethylenediamine.

[0017] According to the above bio-based microemulsion system, the oil washing efficiency was experimentally determined. The blank sample was the injected water of an oil production plant. Three groups of parallel samples were used in the experiment. The same concentration of bio-based microemulsion water wells were selected to remove plugging and increase injection water, and take 20 g of heavy oil crude oil. Samples (at 60 °C, viscosity 10700 mPa·s) were tested. The crude oil in this low-perme...

Embodiment 2

[0032] The present invention has a low-permeability oil reservoir bio-based microemulsion plug-removing and increasing injection system, which is made of the following components: bio-based surfactant is 2%, NaCl is 1%; kerosene is 1.5%; butanol is 2% %; the balance is water. Among them, the bio-based surfactant is made of a bio-based surfactant and a lipopeptide surfactant in a ratio of 2:1, and the bio-based surfactant is N,N-diacetic acid-N'-phenyl ten Octacyl-ethylenediamine.

[0033] The device used in the flooding experiment is a conventional core flooding experimental device. The purpose of the experiment is to study the flow characteristics of the injected water in the core before and after treatment with the depressurization and boosting agent. The change of water phase permeability of core samples was analyzed to analyze the effect of depressurization and injection system. Table 2 shows the test results of the depressurization rate after the core was injected into ...

Embodiment 3

[0043] This embodiment provides a microemulsion plug removal and injection enhancement system suitable for low permeability oil reservoirs, which is composed of the following weight percentages:

[0044] The bio-based surfactant is 3%, the ratio of bio-based surfactant and lipopeptide surfactant is 2:1, and the bio-based surfactant is N,N-diacetic acid-N'-phenyloctadecane Acid acyl-ethylenediamine;

[0045] NaCl is 1.0%;

[0046] 2% for kerosene;

[0047] Butanol 2%;

[0048] The remainder is water.

[0049] Basic conditions of the test area:

[0050] A low permeability water well 10C94-FS104 in Daqing, the water phase permeability is 10-50mD, the reservoir temperature is 54℃, and the injection volume is 25m 3 ; Before injection, the pump pressure is 15.7Mpa, the oil pressure is 14.2Mpa, the casing pressure is 14.2Mpa, and the actual daily water injection is 2m 3 ;

[0051] Table 3 Feedback of field data from water injection wells

[0052]

[0053] The 10C94-FS104 w...

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Abstract

The invention belongs to the field of oilfield development, and particularly relates to a low-permeability oil reservoir bio-based microemulsion plug removal and augmented injection system and an injection process thereof.The low-permeability oil reservoir bio-based microemulsion plug removal and augmented injection system comprises 0.5%-5% of bio-based surfactants, 0.8%-1.2% of inorganic salt, 1%-2% of light component oil, 1%-3% of small molecule alcohol and the balance water, the PH value of the finally formed solution system is 7-7.5, the HLB solubilizing value is 13-16, and the injection process is simple. The dissolving capacity of substances such as colloid asphaltene and paraffin in the thickened oil is improved, and the fluidity of the thickened oil is improved; by adding the lipopeptide surfactant, the wetting capacity of the system and crude oil action is changed, an emulsification phenomenon is formed, the microemulsion plug removal and injection augmentation system and production injection water are injected at the same time, stratum colloid, wax and residual organic blockages of a stratum can be effectively dissolved through the organic solvent, butanol is adopted as a solubilizer, and the system has the advantages that the system is simple in structure and low in cost; the dispersion rate of the organic solvent in the stratum can be effectively improved, the dissolution rate of the system to organic blockages is improved, and the stratum is not damaged due to the excellent environmental protection capability of the bio-based surfactant.

Description

technical field [0001] The invention belongs to the field of oilfield development, and in particular relates to a low-permeability oil reservoir bio-based microemulsion plug-removing and injection-increasing system and an injection process thereof. Background technique [0002] In the production of oil wells, solid particles, mechanical impurities, chemical precipitation, chemical scaling and blockage caused by oil pollution, bacteria or capillary phenomenon in the formation cause difficulty in water injection and decrease in water absorption capacity. the technical difficulty. Commonly used pressure reduction and injection methods include: high-energy gas fracturing, small-scale hydraulic fracturing, acidification and injection of surface-active substances, and more than a dozen methods, each of which has its own characteristics and scope of application. Although the existing technology has alleviated the problems existing in the field, there are still many technical defic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52E21B37/06
CPCC09K8/52E21B37/06
Inventor 王斐张佰宇黄硕刘长宇沈玉江李国军
Owner DAQING HUALI ENERGY BIOLOGICAL TECH
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