China University of Petroleum

Oil and Gas Technology Research Institute, Petrochina Changqing Oilfield Company

Yuyang Li

Caili Dai

Guang Zhao

Qing You

Yahui Lv

Mingwei Zhao

Yining Wu

Yongpeng Sun

Chenglin Gu

Haien Yang

Ping Yi

Jiaping Tao

Xue Yao

The invention provides a modified graphite particle system for strengthening a polymer/binary/ternary composite oil displacement system. The modified graphite particle system comprises the following components: 1-5 parts by mass fraction dispersed graphite particles, 0.2-0.6 parts by mass fraction dispersant, 0.1-0.5 parts by mass fraction wettability modifier, and deionized water that accounts for the remaining content, based on 100 parts by total mass fraction of the components. In addition, the present invention also provides a preparation and a use of the modified graphite particle system for strengthening the polymer/binary/ternary composite oil displacement system. The modified graphite particle system for strengthening the polymer/binary/ternary composite oil displacement system can be used to improve mobility regulation ability and oil displacement efficiency in an injection stage, enhance injection pressure in a follow-up water displacement stage, and increase the oil displacement effect of the composite oil displacement system to the greatest extent.

Modified graphite particle system for strengthening polymer/binary/ternary composite oil displacement system and preparation and application thereof

The present invention provides a modified nano-graphite particle three-phase foam profile control and flooding system, which comprises a liquid phase and a gas phase, wherein the liquid phase comprises 0.15%-0.35% foaming agent, 0.04-0.1% foam stabilizer, and water that accounts for the remaining content, the sum of weight percentages of above components is 100%; a gas-liquid ratio of the gas phase to the liquid phase is (1-3):1. The foaming agent is selected from one of alkylsulfopropyl betaine and alkylamidopropyl betaine or a combination of them. The foam stabilizer is modified nano-graphite particles in 80-150 nm particle diameter. The present invention further provides a preparation method of the modified nano-graphite particle and a preparation method of the three-phase foam profile control and flooding system. The nano-graphite particle three-phase foam profile control and flooding system provided in the present invention can greatly improve the stability of generated foams, has excellent fluidity control capability, is low in cost, simple to prepare, and convenient for large-scale field construction.

Modified nano-graphite particle three-phase foam profile control and flooding system and preparation method thereof

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Qingdao, China

Yuyang Li