Research and application of tubing pump swabbing out-flow technology.;

Research and application of the combined operation technology of straddle test,perforation and swabbing

The swabbing operation should be done in clean tube and decrease the cost of up and down strings combined with test and perforation.

A hydraulic self-sealed swabbing wellhead assembly with anticollision crown;

An economical and safe casing swabbing tool;

If sand is not sunk, by operation of swab to build a different pressure between up and down of sunk sand to form a de- terminate pressure stir makes the sand to sink to reach the objective of unstuck.

Forecasting methods of swabbing well productivity at constant flowing pressure;

Numerical well-test analysis on testing data of swabbing well;

In the double porous media reservoir, flow mathematic model of swabbing well in circular sealed strat um is built up under considering the well bore effect and skin factor.

Tech of setting cement plug by infilling Cement is to send tube, cement filling sleeve and its tools to the predictive depth by swabbing rope.

Optimization of suction parameter of pumping well in low permeability reservoir from grey analytic hierarchy process;

By using the improved suction parameters containing polished rod stroke, pump plunger diameter and pump depth changed, the mathematical models of simulating system efficiency were developed according to .

Efficiency analysis of sucker-rod pumping system and optimal design of swabbing parameter;

A method for systematical engineering analysis is used to describe the procedures for its1parameter design, and the method for optimum design of swabbing parameters is established for rod pumpi.

To achieve the purpose of raising the system efficiency of mechanical recovery in pumping wells and saving electrical energy, efforts should be made to strengthen the work of routine management, technical management, and optimization discussion of swabbing parameters.