The Time Factor Effects of the Drilling Cement Pastes on its Working Characteristics by Increasing Temperature

摘要

By drills realization in order to obtain petroleum and natural gas, the isolation of the individual layers along the height of drilling activity is the most important factor for judging the serviceability and follow-existence of the finished work. The special cements for drilling are used as plugging material suited according to API Spec. 10A (American Petroleum Institute). Recently, in the institute we have dealt with the impact of the time factor on the pressure characteristics and stress-strain diagrams of samples from the drilling mud additives, due to the time factor for composites containing drilled and subsequently in practice applied aggregates and also the characteristics of a drilling cement made for lower and laboratory increased temperature. In the article we deal with a similar topic. Results for tension and pressure characteristics gathered in time up to 120 hours were used to generate the stress-strain diagrams, static and dynamic modules in compression. Heat background of tests answers the real terms of drilling activities up to 1200 m. In conclusion, we will compare the results with available foreign results.