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Bio-based surfactant blocking removal and augmented injection agent and application system

A surfactant and biological surface technology, applied in drilling compositions, wellbore/well components, chemical instruments and methods, etc., can solve problems such as difficult water injection and low oil recovery efficiency, achieve high interface activity and reduce start-up Pressure, increased dispersion effect

Pending Publication Date: 2022-07-15
DAQING HUALI ENERGY BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at overcoming the deficiencies of the prior art, and provides a bio-based surfactant blockage-removing and injection-increasing agent and its application system, the bio-based amphoteric surfactant is the main agent, and other biosurfactants are auxiliary agents The complex system solves the problems of difficult water injection and low oil production efficiency caused by oil plugging in low-permeability, medium-high-temperature, and high-salinity reservoirs

Method used

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  • Bio-based surfactant blocking removal and augmented injection agent and application system
  • Bio-based surfactant blocking removal and augmented injection agent and application system
  • Bio-based surfactant blocking removal and augmented injection agent and application system

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Embodiment 1

[0020] The bio-based surfactant plug-removing and injection-increasing agent and the application system of the present invention are composed of the following substances by weight: the total system of the bio-based surfactant is 3%, and the bio-based surfactant is composed of the bio-based amphoteric The surfactant and the rhamnolipid surfactant were mixed in a ratio of 2:1, 3% butanol, 0.5% ethyl acetate, and the balance was water; after further dilution, the bio-based surfactant accounted for 0.5%, Add acetic acid solution to adjust pH to 5-6 before use.

[0021] Select the wells with different concentrations of bio-based surfactants to remove plugging and increase injection systems, and select crude oil from low-permeability reservoirs in different regions and under different temperature conditions for experiments.

[0022] Oil sample 1# has a density of 0.86mg / ml and a viscosity of 2430mPa·s at 60°C;

[0023] Oil sample 2# has a density of 0.87mg / ml and a viscosity of 310...

Embodiment 2

[0040] The present embodiment provides a bio-based surfactant plug-removing and injection-increasing agent and an application system, which is composed of the following weight percentages: the bio-based surfactant is 5%, and the bio-based surfactant is composed of biological The base amphoteric surfactant and the lipopeptide surfactant are mixed in a ratio of 2:1; ethyl acetate solvent is 1%; the balance is water. , add acetic acid solution to adjust pH to 5~6 before use.

[0041] The depressurization and injection effect of the bio-based surfactant-based water well plug removal and injection system was carried out with a high-pressure core flow tester and characterized by the depressurization rate. The gas permeability of cores is in the range of 10mD. Under the condition of 60℃, the gas permeability of 1#, 2#, 3# and 4# cores are 10.3mD, 10.5mD, 10.3mD and 10.4mD respectively; under the condition of 75℃ , 1'#, 2'#, 3'#, and 4'# cores have gas permeability of 10.5mD, 10.4mD,...

Embodiment 3

[0050] This embodiment provides a bio-based surfactant plug-removing and injection-increasing agent and an application system, which is composed of the following weight percentages: the bio-based surfactant is 1%, and the bio-based amphoteric surfactant is composed of biological The base amphoteric surfactant is mixed with rhamnolipid and sophorolipid in the ratio of 3:1:1, butanol is 1%; ethyl acetate is 1%, the balance is water, the system solution is diluted to 5% concentration, and acetic acid is added. The solution is used after adjusting the pH to 5-6.

[0051] The basic conditions of the test area: the water phase permeability of the block reservoir is 5-50mD, the reservoir temperature is 64℃, the salinity is 45100mg / L, and the well injection volume is 20m 3 ;Pump pressure 16.1Mpa before injection, oil pressure 15.8Mpa, casing pressure 15.5Mpa, actual daily water injection 1m 3 ;

[0052] For water well allocation in an oilfield block, the overall allocation is set to...

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Abstract

The invention relates to a bio-based surfactant plug removal and augmented injection agent and an application system, and belongs to the field of oilfield waterflooding development, the bio-based surfactant plug removal and augmented injection agent is prepared from the following components: 1-5% of bio-based surfactant, 1-5% of small molecular alcohol, 0.1-0.5% of ethyl acetate and the balance of water, water is added to dilute the plug removal and augmented injection agent, an acetic acid solvent is added, and stirring is performed to obtain the bio-based surfactant plug removal and augmented injection agent. The bio-based ampholytic surfactant is further mixed and dissolved with a bio-based surfactant, molecular alcohol and other substances to form a weak acid solvent, a weak acid solution corrodes rocks and inorganic scale substances, meanwhile, the bio-based ampholytic surfactant has the slow release capacity, the blockage removal period is prolonged, the bio-based ampholytic surfactant is matched with ethyl acetate for application, the oil washing and dissolving capacity is further improved, and the blockage removal efficiency is improved. The wettability of a rock pore throat is changed, an oil-in-water emulsification structure is formed, and blockage caused by underground flowback crude oil in a near wellbore area is effectively relieved.

Description

technical field [0001] The invention belongs to the field of oilfield water injection development, and in particular relates to a bio-based surfactant plug-removing and injection-increasing agent and an application system. Background technique [0002] At present, water injection and oil recovery from water wells in oilfields are still the main solution for the development of low-permeability reservoirs. However, due to their special properties such as low permeability and low porosity, low-permeability reservoirs have relatively low water absorption capacity. In addition, the swelling of clay and the incompatibility between the oil-soil layer and the injected water also greatly reduce the water absorption capacity, which increases the injection pressure, resulting in an increase in the pressure zone around the water injection well, which further reduces the effective injection pressure difference and makes the injection rate fast. decline. The pressure rise of the water in...

Claims

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Application Information

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IPC IPC(8): C09K8/524C09K8/528C09K8/575E21B37/06
CPCC09K8/524C09K8/528E21B37/06C09K8/575C09K2208/12
Inventor 张佰宇王斐吕志涛宋海艳
Owner DAQING HUALI ENERGY BIOLOGICAL TECH
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