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Supercritical CO2 oil displacement system and oil displacement method

An oil displacement method and supercritical technology, applied in chemical instruments and methods, production fluids, earth drilling and production, etc., can solve problems such as easy gas channeling and unsatisfactory recovery in high-permeability strips

Active Publication Date: 2020-10-30
CHINA UNIV OF PETROLEUM (BEIJING) +1
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AI Technical Summary

Problems solved by technology

In recent years, my country has carried out a second census and evaluation of tertiary oil recovery potential. The reserves of oil reservoirs suitable for gas injection flooding to enhance oil recovery exceed 10%. Research on the application of gas injection flooding technology is carried out to stabilize the eastern part, develop the western part, and maintain the main oil fields. High yield is of great significance, carbon dioxide (CO 2 ) has the advantages of improving the mobility ratio between oil and water, reducing the viscosity of crude oil, extracting light hydrocarbon components in vaporized crude oil, reducing the interfacial tension between oil and water, expanding the volume of crude oil, and increasing the permeability of the reservoir. It is a gas injection flooding technology common reservoir displacement media, however, conventional CO 2 During the flooding process, there are defects such as gas channeling in the high-permeability zone in the oil layer, and the recovery factor is not ideal

Method used

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  • Supercritical CO2 oil displacement system and oil displacement method
  • Supercritical CO2 oil displacement system and oil displacement method
  • Supercritical CO2 oil displacement system and oil displacement method

Examples

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Embodiment 1

[0031] In this example, the rock core used was a cuboid homogeneous rock core with electrodes of 9×9×30 cm, and its air permeability was measured to be 547 mD; the simulated oil used was prepared from Daqing crude oil and kerosene at a volume ratio of 1:3. Under the condition of 50°C, the viscosity is 12.4mPa·s; the oily sewage produced from the oil layer of Daqing Oilfield was taken, and the simulated water used was obtained after filtration; the hydrophobic polypropylene Amide (from Sinopharm Chemical Reagent Co., Ltd.) was prepared into a polymer solution with a concentration of 1000 mg / L for polymer flooding; the erucamide propyl dimethylamine surfactant used was purchased from Sinopharm Chemical Reagent Co., Ltd. In this example, the silica star-shaped acrylamide copolymer (AM-co-AANa-co-VTS-SiO 2 ) was prepared according to the method in the following literature: "Preparation of star-shaped acrylamide copolymer containing nano-silica by living controllable free radical p...

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Abstract

The present invention provides a supercritical CO2 oil displacement system and an oil displacement method. The supercritical CO2 oil displacement system comprises supercritical CO2 and a base solutiondissolved in the supercritical CO2, and the base solution comprises a polymer, a surfactant, an alkali and water. The supercritical CO2 oil displacement system provided by the invention has a largerswept volume in an oil layer, and the recovery ratio can be greatly improved.

Description

technical field [0001] The present invention relates to a kind of supercritical CO 2 An oil displacement system and an oil displacement method belong to the field of petroleum exploitation. Background technique [0002] my country's oil and gas fields are mainly distributed in continental sedimentary basins, which are characterized by high viscosity and high wax content. The sandstone oil fields in the east have gradually entered an ultra-high water cut period after continuous water injection development, but the remaining recoverable reserves are still nearly 50%, which still has a large potential. Tap the potential space. At present, with the deepening of water flooding development, the intralayer contradictions in the lower part of the structure have gradually become the main contradiction limiting the development level of the oilfield. When the oil layer thickness and permeability are relatively large, the oil-water gravity differentiation is obvious, and the positive rh...

Claims

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Application Information

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IPC IPC(8): C09K8/594C09K8/584C09K8/588E21B43/16E21B43/22
CPCC09K8/584C09K8/588C09K8/594E21B43/16E21B43/164Y02P20/54
Inventor 宋考平付洪涛宋庆甲杨二龙蒋声东王付勇郭春萍杨克娜
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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