Development and application of easily drilled float collar or float shoe

Abstract：As an important indicator for the performance of the float collars and the float shoes, Drillability affects the cycle time and cost of drilling operations directly, as a result, impact on the rate of penetration of the drilling machine. In order to solve the drillability difficulties domestically, and to satisfy the urgent needs for the drilling speed improving, a set of novel easily drilled float collar and float shoe were developed. By developing the back-pressure valve with high molecular polymer material and the early-strength concrete with micro-expansion, the drillability and reliability of the float collar and float shoe were greatly improved. The easily drilled float collar and float shoe were applied in fields at home and abroad after ground performance testing, which fully verified the safety and reliability as well as the excellent drillablility performance.te