Under the environment in which diffusing exists,an accessory of pressure testing system with capillary,being difficult to test and needing frequent blowing,we developed a pressure-testing and diffusing cartridge.

Using orthogonality testing method and single factor analysis,activator,additive,water ratio and technological conditions effect on non-sintered ceramsite cylindrical compress strength were discussed.

Study of distribution of wellbore pressure and temperature of CO_2 injection well;

these problems have some ralationship with wellbore pressure.

The technology of micro flow control for drilling fluid has been developed recently in accordance with the problem of wellbore pressure control during drilling process.

Comparison of stresses in the flat extrusion container under two different boundary conditions;

In the design of structural sizes for a flat extrusion container,the concept of multi-objective optimization was developed in order to make full use of the potential of die material and greatly reducing the deformation of inner layer cavity.

An analysis was made on the equivalent stress, contact pressure and deformation of the multi_layer shrink_fitting flat extrusion container by using the finite element analysis software ANSYS.

Coupling analysis of multi-layer flat container by the finite element analysis;

With great thickness transition of inner layer from major axis to minor axis, the inner cavity of shrink-fitting flat container would deform unevenly beyond the prescriptive dimension precision, which would put re-sinking of die into trouble.

A mathematic model for eveluation of single-layer flat container stress under uniform internal pressure is established.