Chemical intervention in-situ emulsification system

An emulsification system and in-situ technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of complex removal of water components, large energy consumption, and low dehydration efficiency, so as to reduce development contradictions, The effect of reducing the dosage and improving the efficiency of oil washing

Pending Publication Date: 2021-10-01
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If gravity sedimentation is used, the dehydration efficiency is low, and the dehydration rate is also low; if other methods are used, it needs to consume a lot of energy or add some chemicals
Especially in the case of adding chemicals, it makes the removal of water components more complicated, which affects the subsequent treatment

Method used

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  • Chemical intervention in-situ emulsification system
  • Chemical intervention in-situ emulsification system
  • Chemical intervention in-situ emulsification system

Examples

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Effect test

Embodiment 1

[0035] The composition of the chemical intervention in-situ emulsification system: 0.1% oleic acid amidopropyl dimethyl tertiary amine, 0.3% nonyl alcohol polyoxyethylene ether sodium sulfate (the degree of polymerization of polyoxyethylene ether is 7), 0.05% graphene oxide , and the rest is injected water (10×10 4 mg / L NaCl), after adding each component into the injection water, configure a system with a total volume of 100mL, and feed CO into the system at a rate of 300mL / min 2 After 30 minutes, a worm-like micellar system was obtained, which was prepared into chemical intervention emulsification system 1, which is used to adjust the viscosity of the mixture of heavy oil and clear water, so that the viscosity of heavy oil will not change too much during the production process, making it easier to produce.

Embodiment 2

[0037] The composition of chemical intervention emulsification system: 0.3% oleic acid amidopropyl dimethyl tertiary amine, 0.15% sodium nonylphenol polyoxyethylene ether carboxylate (the degree of polymerization of polyoxyethylene ether is 7), 0.05% silane coupling agent KH550 modified silica, the rest is injection water. After adding each component into the injection water, configure a system with a total volume of 100mL, and inject CO into the system at a rate of 300mL / min. 2 After 30 minutes, a worm-like micellar system was obtained, which was prepared into chemical intervention emulsification system 2. This system is used to adjust the viscosity of thin oil reservoirs during water flooding, so that the viscosity of the mixture of thin oil and injected water increases, which is convenient for production.

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Abstract

The invention discloses a chemical intervention in-situ emulsification system, which comprises the following raw materials by weight: 0.1-0.3% of a CO2 responsive monomer, 0.1-0.3% of a surfactant, 0.01-0.1% of a hydrophilic nano-material, and the balance of water, the surfactant is an anionic surfactant or an anionic-nonionic surfactant, The nano material is one or a mixture of more of crystalline flake graphite powder, graphene oxide, hydrophilic silicon dioxide and hydrophilic carbon nanotubes. The chemical intervention emulsification system can be suitable for heavy oil reservoirs and thin oil reservoirs, meanwhile, the viscosity of the chemical intervention emulsification system is adjusted to a moderate degree, the viscosity of the chemical intervention emulsification system is not too small or too large, and the chemical intervention emulsification system can be used for heterogeneous reservoirs. Meanwhile, after the crude oil forms the emulsion, other demulsifiers do not need to be added, and rapid demulsification and dehydration can be realized only by introducing N2 gas.

Description

technical field [0001] The invention relates to the technical field of oil field chemistry, in particular to a chemical intervention in-situ emulsification system. Background technique [0002] At present, most oilfields have entered the stage of high water cut after long-term water flooding development, and it has become more and more difficult to stabilize the production of oilfields, but most of the crude oil (60%-70%) still exists in the reservoir, so it is necessary to use enhanced oil recovery technology Enhanced oil recovery, and chemical flooding is the most widely used in enhanced oil recovery technology. At present, chemical flooding mainly has the following three research directions: 1) By reducing the viscosity of crude oil or increasing the viscosity of displacement fluid to improve the mobility ratio, polymer flooding, foam flooding and other oil displacement methods have been formed; 2) based on improving wettability and improving The method of capillary numb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/584C09K8/58C09K8/60C09K8/66
CPCC09K8/665C09K8/68C09K8/584C09K8/58C09K8/602C09K8/604C09K2208/10
Inventor 杜代军蒲万芬邹滨阳鹿嘉悦刘锐
Owner SOUTHWEST PETROLEUM UNIV
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