Ways to further improvement of well drilling by downhole drilling motors

Abstract

Recently, the study of elements of on the fly operation of well technology is carried out in design direction. Famous systems of foreign and domestic computer programs (including practice of offshore drilling) are based on application equations (as a rule, power) when describing process of bottom hole break by drilling bit. That cannot be adapted to frequent changes of physical and mechanical rock properties and less in isotropic rocks. Therefore, to increase speed of well construction it requires an integrated method to operate process of well drilling based on proposed new technologies (change of pressure and rate of drilling equipment lowering) with accounted automation of well construction process. As a result of practical and theoretical studies of application of downhole drilling motors the model of on the fly operation of well drilling is presented in form of set containing most important elements that influence construction processes. Paper presents characteristic elements of the system to control efficiency of downhole drilling motors comparing to existing practice of control well construction. Proposed model drilling control takes into account system and analytical approach with a clear allocation of subsystems and systems that are effectively and fully implemented with provided hydraulic energy. The issue of control efficient well drilling by elements of on the fly operations is still controversial. The authors formulated problems of search of optimal drilling regimes under conditions of unlimited change of physical and mechanical rock properties during well drilling. Practical implementation of efficient well construction technology could overcome several challenges.

Keywords

• downhole drilling motor
• test bench parameters of downhole drilling motor
• technology for downhole drilling motor operating
• control of hydraulic energy
• differential pressure drawdown
• drilling rate