Based on the concept of the effective well-radius,in Laplace space,a mathematical model is established which has a well with skin effect and wellbore storage in the center of a homogeneous, isotropic circular reservoir with a constant-pressure outer boundary.

The methods to determine reservoir boundary for reserves researches;

Based on selecting circular reservoir having analytic solution and adopting one of the no-girding methods-no-unit Galerkin method, pressure distribution can be gotten the solution.

One of the most important parameters of trap effect was studied based on the analysis of the importance of uniform scratch and its effect on the polishing time,contact models between circle abrasive grain,line boundary and circle boundary were deduced to investigate the relations between engagement depth and the ratio of normal force to normal elastic stiffness.

Rapid identification and analysis of outer reservoir boundary using template curves of dimensionless pressure derivative;