This paper considers downhole directional drilling systems in the presence of unexpected variations in steering force, input delays, measurement noise and measurement delays, and explores the application of L1 adaptive controller for the trajectory control problem. The Explicit Force, Finitely Sharp, Zero Mass (EFFSZM) model is used for the steering system, in which spatial delays, modeling ina...

Both shipboard and shore-based magnetic studies of Ocean Drilling Program (ODP) Leg 208 sediments produced poor-quality irectional data. A noisy inclination signal and a pervasive declination bias demonstrate that the sediments had been remagnetized nd/or deformed. In an attempt to characterize any deformation, we carried out anisotropy of magnetic susceptibility (AMS) experments on a suite of ...

Electric discharge drill machine (EDDM) is a spark erosion process to produce micro-holes in conductive materials. This process is widely used in aerospace, medical, dental and automobile industries. As for the performance evaluation of the electric discharge drilling machine, it is very necessary to study the process parameters of machine tool. In this research paper, a brass rod 2 mm diameter...

Abstract Wellbore instability is frequently encountered in the process of shale oil drilling. Due to anisotropic strength characteristics shale, most conventional models are not suitable for wellbore stability analysis layered formation. In this paper, taking continental north Songliao Basin as research object, elasticity and parameters measured experimentally. Based on pore elastic mechanics, ...

vibratory drilling (vd)process is a new modern technology where longitudinal wave with high frequency (more than 16 khz) and low amplitude (usually between 2 up to 30 µm) is superimposed on the movement of cutting tool, resulting in connection and disconnection of cutting tool engagement with workpiece. in this study, in order to perform vibratory drilling process, two vibration tools are desig...

With the rapid growth of oil and gas storage, transportation, pipeline industries, it is necessary to improve construction process pipelines. By combining technical advantages horizontal directional drilling pipe jacking construction, direct laying method suitable for crossing in different strata gas, water conservancy hydropower, municipal industries due its less land, high speed, reversibilit...