DefinePK

Abstract

We need to know the magnitude of the forces acting on rolling drilling bit to assess reliability and durability of cutting structure of rolling drilling bits and datum mode of roller bit. There is a brand new measuring device that allows measuring the amount of force on each tooth of each roller bit in cooperation with nondestructive bottom hole, consisting of concentric steel rings, divided into two sectors. There was made a skid for realization of this method, which was intended for rolling drilling bit under pressure in bottom hole of measuring device. There is a method for measurement of forces, which effects on elements of rolling drilling bit. There is a substantiation about choice of object of research and results of made experiments and its statistical processing minimum required length of one test was determined and number of repeats of each test to obtain reliable results at a given confidence level and permissible measurement error. There was made an analysis, which showed cooperation schemes of one crown to bottom hole, and on the basis of which it was concluded that axial components of forces have a greater impact on the durability of drilling bit cutting structure than tangential. Therefore, only axial components were evaluated in selection of test mode. Optimal ranges of axial loads on bit and bit speeds were determined, and that allowed getting an objective picture of distribution of forces on drilling bit cutting structure. Developed method with using a computer allows getting a large amount of reliable information very quickly about how to download all elements of equipment of rolling drilling bits of various sizes in order to optimize the design of their cutting structure and gauntries.