Method of bottom hole pressure,temperature and drilling fluid density measurement while drilling;

By combining with formatting density logging,we calculated parameters of rock elasticity and intensi- ty using multi-pole array acoustic logging,and performed for- rnation stress analysis to determine breakdown pressure and drilling fluid density.

Then breakdown pressure,caving pressure and drilling fluid density can be obtained,which will act as references for drilling design to guide safe drilling.

Well drilling in a salt formation is a problem in drilling,while accurately establishing the mud density and undersaturation is the key for solving the problem.

This principle is different from the traditional one described on most textbooks in China and abroad that the mud density is designed according to the highest pore pressure of a section to be drilled.

On the base of core experiment,the basic parameters that influence the collapse are calculated,and mud density for the stability of wellbore wall is determined.

Application and development of deep well high-density drilling fluids;

On the basis of the existing solid control system,a process for recovering weighting materials out of the high-density drilling fluid is developed.

Quantitative evaluation of factors influencing filtrate loss of high density mud;

Faults are also developed in this area, which leads to abnormally high formation pressures, necessitating high density muds to balance the formation pressure.