Calculation algorithm of the functional dependence of the lateral profile shape of tool-joint tapered thread for drill string elements on the cutting tool geometry

Abstract

The modern technologies of oil and gas production under conditions of the increasing role of lateral and directional wells require enhancement of the drill string reliability. It is primarily aimed at enhancement of the tooljoint thread strength. At present, the manufacturing technology of screw thread involves, mainly, the tools having one common disadvantage: all leading companies offer cutting blades with the zero value of the static front angle in the apex point. So, thread cutting technology does not involve usage of such a considerable impact on the technological process as adjustment of the front angle value, thus, failing to comply with the oil and gas production requirements. Thus, it is urgent to use the precise analytical approach to design of cutting tools with non-zero values of the front angle and the cutting edge slope angle. In this article it was proposed to use the calculation algorithm of the lateral profile shape of tool-joint tapered thread depending on the specified cutting tool geometry.