Dr. Zhimiao Li Profile

Dr. Zhimiao Li

at Northeast Petroleum University

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Proceedings Article | 4 March 2015 Paper

The effect of elastic modulus and friction coefficient on rubber tube sealing performance

Zhimiao Li, Siyuan Xu, Fushen Ren, Jubao Liu

Proceedings Volume 9302, 93022F (2015) https://doi.org/10.1117/12.2081096

KEYWORDS: Sensors, Head, Lithium, Finite element methods, Numerical simulations, Connectors, Composites, Astatine, Liquids, Experimental mechanics

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The packer is the key element in separating geosphere layers of water injection, water plugging and fracturing operations in the oilfield. The sealing ability of the packer is depending on the contact pressure between rubber tube and the casing. The circumferential strain of casing wall was tested by the strain gauge to get the contact pressure distribution along axial direction of the tube. The friction force between the casing and the rubber tube was taken by the pressure sensor in compression process. Under the 20,60 and 100 degrees Celsius conditions, the friction forces and the contact pressure distribution were taken in work condition of single rubber tube, double rubber tubes and combination rubber tubes after oil immersion .The result shows that elastic modulus of rubber tube has little effect on the friction force and contact pressure. With elastic modulus decreasing, the friction forces has gradually decreasing trend; The friction coefficient has much impact on friction force: the friction forces under the condition of dry friction and wet friction are respectively equivalent to 48.27% and 5.38% axial compression forces. At wet friction condition, the contact pressure distribution is more uniform and the sealing effect is better.

Proceedings Article | 15 April 2010 Paper

Dynamics experimental study of column in the well

JuBao Liu, ZhiMiao Li

Proceedings Volume 7522, 75222F (2010) https://doi.org/10.1117/12.851542

KEYWORDS: Motion measurement, Sensors, Head, Liquids, Fluid dynamics, Analytical research, Transducers, Lithium, Vibration simulation, Signal generators

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Mechanical analysis of bottom hole assembly(BHA) is the basis of well trajectory control technology. Considering the displacement and force boundary conditions of drillstring and testing axial excitation force of bottom column, axial acceleration of head column, transverse displacement of columns and collision and contact forces between inner columns and outer pipe, dynamics experimental device of column-liquid interaction is built to do two kinds of test: the column vibrating test under the conditions of different vibrating frequency and different axial excitation force and the column rotating test under the conditions of different axial excitation force, different rotating speed and different flux. The experimental results show that the changes of vibrating frequency and the flow has little effect on axial vibrating force of bottom column and radial displacement of column, but the existence of the liquid will reduce the axial force amplitude of bottom column; With the speed increased, radial displacement of the column and the segments of the collision and contact column between the column and the pipe increase and the columns have the phenomenon of multi-segments swing. It is to provide the device and means to study dynamics movement rules of rotating column in the pipeline.

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