China University of Petroleum

Shikun Tong

Baojiang Sun

Zhiyuan Wang

Jianbo Zhang

Xiaohui Sun

Hui Liu

Peng Liu

Jihao Pei

Qingwen Kong

Wenqiang Lou

Zhengfeng Shan

Zheng Liu

Longqiao Chen

A microscopic and macroscopic evaluation method for a dual-effect hydrate inhibitor is provided. The method is applicable to the performance evaluation of traditional thermodynamic inhibitors and kinetic inhibitors. The present invention comprehensively evaluates the dual-effect hydrate inhibitor microscopically and macroscopically through a microscopic evaluation device and a macroscopic evaluation device, thereby more intuitively and efficiently screening out the dual-effect inhibitor with excellent performance. The present invention explains the action mechanism of the dual-effect inhibitor microscopically, accurately evaluate the effects of the inhibitor in two aspects of particle aggregation and particle adhesion, and provide a theoretical basis for screening the dual-effect inhibitor. Moreover, the present invention can verify the screened inhibitor macroscopically by using a flow evaluation device close to a field working condition to obtain the action effects of the dual-effect inhibitor under different production parameters, so that the comprehensive and multi-angle performance evaluation of the dual-effect inhibitor is achieved.

Microscopic and macroscopic evaluation method for dual-effect hydrate inhibitor

An apparatus for preventing and controlling secondary generation of hydrates in a wellbore during depressurization exploitation of offshore natural gas hydrates includes a gas recovery pipe column, a water recovery pipe column, a gas-liquid mixed transportation pipe section, a data collecting and processing unit, and a reaction control apparatus; according to characteristics of different exploitation pipe columns, three injection pipelines and three monitoring points are arranged to predict dynamic changes in a secondary generation risk of the hydrates throughout the wellbore; measures for preventing and controlling the secondary generation of the hydrates are taken at different pipe column positions by the integrated utilization of inhibitor injection, heating for pipe columns, the additional arrangement of electric submersible pumps, and other methods.

Apparatus for preventing and controlling secondary generation of hydrates in wellbore during depressurization exploitation of offshore natural gas hydrates and prevention and control method

An active control method and system for wellbore pressure in open-cycle drilling in marine natural gas hydrates. The system comprises a drilling system, a drilling fluid injection system, and a data processing system for conducting the drilling operation.

Active control method and control device for wellbore pressure in the open-cycle drilling of marine natural gas hydrates

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Qingdao, China

Shikun Tong