Petrochina Company Limited

Zhenfeng Zhao

Lijun Mu

Jin Liu

Kai Lin Li

Jiang Wu

Hongjun Lu

Gang Guo

Zhongxing Li

Xiaojia Xue

Jianhui Li

Xiaoqun Zhou

Cheng Xian

Yin Qi

Jun Bu

Kuangsheng Zhang

Xiangping Li

Huabo Fan

Xiangqian Bu

Li'an Yang

Baoqiang Lv

Jianshan Li

Boping Zhao

A low density, high-strength, degradable temporary plugging agent which includes 60% by weight to 85% by weight of polylactic acid, 5% by weight to 20% by weight of a starch, 5% by weight to 10% by weight of polycaprolactone, 2% by weight to 5% by weight of a solubilizing agent, and 2% by weight to 5% by weight of a toughening agent, based on 100% by weight of the total weight of the agent. The rigid agent can result in bridge plugging in existing cracks, with a significant increase in pressure. The preparation method is simple, the process requirements are low, and industrial production can be realized. When applied to temporary plugging fracturing, under formation conditions, it can be completely degraded within a certain period of time and will not cause secondary damage to the reservoir, while preventing the agent from polluting the formation and the occurrence of pump accidents.

Low-density, high-strength degradable temporary pugging agent and the preparation method and use thereof

A surfactant that changes the wettability of tight sandstone and its preparation method and application. By adding the aqueous phase solution into the oil phase solution, and under the action of the emulsifier, a uniformly dispersed phase is achieved. Then adding initiator, stirring and raising the temperature, reacting the reaction at the temperature to obtain a colorless and transparent liquid, i.e., high polymer. At room temperature, adding fluorocarbon surfactant and biosurfactant and stirring was continued for 4 hours to obtain a surfactant that changes the surface wettability of tight sandstone. The surfactant of the present invention can reduce the oil-water interfacial tension, transform the oil-wet surface into water-wet surface, which reduces the adhesion of oil droplets to rock surface and improves the flowability of crude oil in the original stratum, and improves the recovery of low-permeability reservoir.

Surfactant that changes the wettability of tight sandstone and its preparation method and application

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Beijing, China

Zhenfeng Zhao