China University of Petroleum

Chengdu Omax Petroleum Technology Co., Ltd

Ruihe Wang

Chengwen Wang

Zizhen Wang

Yucheng Xue

Weidong Zhou

Huan Wang

Jinsheng Sun

Baojiang Sun

Rui Zhang

Wei Zhou

Xian Shi

Xin Chen

Xianbo Lei

Luopeng Li

Wenfei Li

Yong Li

Changqiang Tang

Hongjian Ni

A method for evaluating rock drillability by a nano-indentation test on a rock cutting includes: conducting a nano-indentation test on a rock cutting sample, acquiring a displacement-load curve of an indenter, and calculating a micro-hardness under the nano-indentation test; calculating mineral composition of the rock cutting sample based on a statistical distribution characteristic of the micro-hardness, and transforming the micro-hardness under the nano-indentation test on the rock cutting sample into a macro-hardness; and calculating a rock drillability grade characterized by the micro-hardness under the nano-indentation test on the rock cutting sample based on a correlation between the macro-hardness of the rock cutting sample and the rock drillability grade. In the context of few downhole rock samples and high cost, the method overcomes the limitation of sample size and shape on conventional testing and solves the difficult problem of mechanical parameter testing of deep rocks.

Method for evaluating rock drillability by nano-indentation test on rock cutting

The present disclosure relates to a high-temperature retarder suitable for oil and gas well cementation, a preparation method thereof and a cementing slurry.

High-temperature retarder suitable for oil and gas well cementation, preparation method thereof and cementing slurry

An oil well cement settlement stabilizer is ternary cement settlement stabilizer or quaternary cement settlement stabilizer; wherein the quaternary cement settlement stabilizer containing structural units A represented by formula (I), structural units B represented by formula (II), structural units C represented by formula (III), and structural units D represented by formula (IV); Wherein the ternary cement settlement stabilizer containing structural units A represented by formula (I), structural units B represented by formula (II), and structural units D represented by formula (IV); 

Oil well cement settlement stabilizer for high-temperature cementing of oil and gas wells and preparation method thereof, and cement slurry

The present invention relates to the field of oil and natural gas well cementation engineering, in particular to a foam stabilizer composition, foamed cement slurry and an additive composition thereof. The foam stabilizer composition comprises C6-C20 alkyl amido alkyl amine oxide, C6-C20 alkyl amido alkyl betaine, and triterpenoid saponin compound. The foam stabilizer composition provided in the present invention is helpful for forming foamed cement slurry that has high foam stability, and the foam stabilizer composition can work with other active components in the foamed slurry additive composition provided in the present invention to enable the foamed cement slurry that contains the additive composition to obtain low density, high foam stability, low permeability, and high compressive strength, which is especially applicable to well cementing operation in an oil and natural gas exploration and development process.

Foam stabilizer composition, foamed cement slurry and additive composition thereof

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Shandong, China

Ruihe Wang