Abstract Subsurface pressure quantification is the main goal for all drilling engineers due to its vital importance minimizing costs and preventing various excavating dilemmas such as stuck pipe, pipe collapsing, lost circulation, well kick. Formation measured directly in producing hydrocarbon zones using special equipment; however, it difficult obtain pore measurements other intervals; therefo...

When using light-alloy drill pipes (LAIDP) with steel tool joints, the development of contact corrosion is observed under certain operating conditions. The value mainly depends on difference in electrochemical potential (ECP) contacting metals. One effective methods for increasing resistance aluminum alloys micro-arc oxidation (MAO) method. This an process combination micro-arc-discharges pheno...

As the core accoutrement of directional drilling construction, measurement while (MWD) device can be divided into three types due to different data transmission methods: wired, mud pulse and electromagnetic wave. This paper used method develop a MWD for mines, working principle signal transmission, encoding structure were described. Experimental research showed that wireless had advantages long...

Beside the twist drill, the effects of various drill geometries were rarely discussed in analytical fashion. This study presents a comprehensive analysis of delamination in use of various drill types, such as saw drill, candle stick drill, core drill and step drill. In this analysis, the critical thrust force at the onset of delamination is predicted and compared with the twist drill. © 2003 El...

Abstract Micro pile hole is a kind of bored with diameter 100~400mm, which has been widely used in the field transmission line engineering recent years, and its formation usually uses DTH (Down-the-Hole) drilling rig. When rigs operate, slag discharge method to use compressed air provided by compressor blow muck directly from bottom ground. However, during process, it difficult out due large cr...

Among the power drills ( Electrical/ Pneumatic/Battery ) used in Orthopedic surgery, battery drill has got several advantages. Surgeons in low resource settings could not routinely use Orthopedic battery drills (OBD) due to the prohibitive cost of good drills or poor quality of other drills. “Hardware” or Engineering battery drill (HBD) is a viable alternative to OBD. HBD is easy to procure, ru...