Calculation Analysis on Force Deformation of Packer String with Free Movement;

A string-supporting centralizer used in water plugging and water injection operation;

l production technology of zone replacement by downhole immobile string.;

Research on pipe string distortion and hardness check in water injection well with high pressure;

Discuss on pipe strings for fracture operation of heavy-deviated and much deeper well;

Research and application on the separated layer polymer-injection pipe string;

When the whole layered water injection strings have been run into the hole,the pressure test for the tubing strings often can not meet the requirement of the standards,and when the next packer-check operation is conducted,the whole tubing strings can not be pulled out of the hole while we try our best to do it.

Integrated and back-off tubing string for the separate zone production in the reducing well is designed.

A mathematical model was proposed for describing the longitudinal and transverse vibrations of sucker-rod string,longitudinal vibration of tubing string coupled with fluid columns vibration in the directional and horizontal well bore with plane curve.