China University of Petroleum

China Shi Da Education Development Co., Ltd.

Binglin Li

Binfei Li

Qichao Lv

Yuliang Su

Zhaomin Li

Chao Zhang

Teng Lu

Qian Sun

Songyan Li

Lei Li

Wendong Wang

Shouya Wu

Yajie Xu

Yongmao Hao

Dongxia Li

A dual-purpose sacrificial anti-swelling agent, and a preparation method and application thereof are provided and relate to the technical field of oil reservoir exploitation. The dual-purpose sacrificial anti-swelling agent is quaternized lignin, a phenolic hydroxyl group of quaternized lignin is linked with two quaternary ammonium nitrogen atoms that are located at para positions of the same six-membered ring. Raw materials used in the present disclosure are prepared from papermaking waste liquid and a by-product of flue gas desulfurization and denitrification, which not only reduces the cost, but also transforms waste materials into valuable resources. The present disclosure increases the adsorption capacity of quaternized lignin in the formation by quaternizing lignin, and enables quaternized lignin to acts as both a sacrificial agent and an anti-swelling agent through competitive adsorption, achieving multiple purposes by using one agent.

Dual-purpose sacrificial anti-swelling agent, preparation method and application thereof

The last sentence of the abstract has been deleted because it refers to purported merits of the invention. The abstract should not refer to purported merits or speculative applications of the invention and should not compare the invention with the prior art, therefore the abstract has been amended to delete the last sentence by Examiner's amendment.

Method for increasing production and injection of reservoir coupled with flue gas desulfurization and denitrification

A novel inorganic fine particle reinforced foam system for an oil-gas field and preparation method thereof. The reinforced foam system comprises a gas phase and a liquid phase; the gas phase is nitrogen, carbon dioxide or the air; the liquid phase is prepared from, by mass: 0.2-0.8 wt % of a foaming agent, 0.5-2.0 wt % of novel inorganic fine particles and balance of water; the novel inorganic fine particles are fine particulate matter with diameters being smaller than or equal to 2.5 microns captured and screened from the atmosphere.

Inorganic fine particle reinforced foam system for oil-gas field and preparation method thereof

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Qingdao, China

Binglin Li