Southwest Petroleum University

Dezhi Liu

Yang Bai

Pingya Luo

Jing Zhang

Gang Xie

Wenzhe Li

Daoxiong Li

Chunyan Liu

Hongbo Li

Hao Kai Zhang

Cheng Li

Feng Dai

Yan Cheng

Guojun Li

Lingfeng Wu

Haibo Liang

Wen Xu

Danchao Huang

Chaowei Hu

A preparation method of a fully adaptive modified nanographene plugging type anti-collapse drilling fluid is disclosed. A modified nanographene slurry anti-collapse agent and a water-based drilling fluid containing the modified nanographene slurry anti-collapse agent are disclosed. The preparation method includes subjecting a nanographene and a mixed acid to a first contact to obtain a mixed liquid, dropwise adding potassium chlorate into the mixed liquid under the condition of ice-bath pan to carry out a modification treatment, so as to obtain a modified nanographene, and subjecting the modified nanographene to a second contact with water to prepare a modified nanographene slurry.

Preparation method of fully adaptive modified nanographene plugging type anti-collapse drilling fluid and use thereof

An oil-based drilling fluid composition, includes a base fluid and a treating agent. The base fluid comprises a base oil and an inhibitor; the treating agent comprises an organic soil, a main emulsifier, an auxiliary emulsifier, a plugging agent, a weighting agent, a humectant, an alkaline regulator and a filtrate reducer. 5-25 parts by weight of the inhibitor, 5-12 parts by weight of the organic soil, 1-6 parts by weight of the main emulsifier, 2-8 parts by weight of the auxiliary emulsifier, 3-18 parts by weight of the plugging agent, 5-30 parts by weight of the weighting agent, 2-6 parts by weight of the humectant, 2-7 parts by weight of the alkaline regulator and 2-10 parts by weight of the filtrate reducer are used, based on 100 parts by weight of base oil.

Oil-based drilling fluid composition, oil-based drilling fluid and preparation method and use thereof

A method of preparing a modified polyvinyl acetate includes subjecting a mixed liquor Lcontaining a functional monomer to a first reaction with a first vinyl acetate monomer, followed by adding a first initiator to carry out a second reaction to obtain a mixed liquor L; subjecting an acrylate monomer, a second vinyl acetate monomer, a second initiator and the mixed liquor Lto carry out a third reaction to obtain a mixed liquor L; and subjecting a third initiator and the mixed liquor Lto carry out a fourth reaction under the air-tight and ultrasonic conditions. The functional monomer is selected from acrylic acid, oleic acid or butenedioic acid. Uses of modified polyvinyl acetate obtained by the method and oil-based drilling fluid containing the modified polyvinyl acetate are also disclosed.

Modified polyvinyl acetate and preparation method and use thereof and oil-based drilling fluid

The invention discloses a method and system for obtaining an evaluation model and an evaluation method and system for the plugging performance of drilling fluid. The method for obtaining the evaluation model comprises: applying a confining pressure to a holding device where a preset fracture model is located, wherein a displacement differential pressure of two ends of the holding device is a preset displacement differential pressure; measuring a flow of standard measuring fluid flowing through the preset fracture model under different confining pressures, wherein the different confining pressures gradually increase according to a first preset rule; and controlling to stop increasing the confining pressure when the flow of the standard measuring fluid flowing through the preset fracture model reaches a preset flow so as to compress the preset fracture model into the evaluation model at a micro-nano level.

Method and system for obtaining micro-nano level fracture model and evaluating plugging performance of drilling fluid

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Chengdu, China

Dezhi Liu