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...

In oilfield equipment, a significant place is occupied by clamping mechanisms used to grip pipes during tripping operations. They are mainly divided into 2 groups. The first includes with forced of the part. second group self-clamping devices wedge mechanism. Here, force increases in proportion axial shear force. these devices, jaws serve as common element. addition smooth jaws, there may be no...

Drill pipe angle is one of the key parameters for adjusting drilling technology, which needs real-time measurement. In this paper, an sensor based on triboelectric nanogenerator proposed. The can be set to different resolutions by designing EVA sheets. Taking 12 sensors as example, test results indicated sensitivity 0.08∘/V, linearity 5.2%, and maximum relative error 6%. terms self-supply capab...

Characteristic types of operational defects which formed on the inner or outer surface drill pipes strength group G-105 are described. The results technical diagnostics were used when drilling wells in territory Dnipro-Donetsk gas-oil-bearing region. In 2018-2019, Ukrburgaz Drilling Department rejected 89 at a depth 4,000 to 6,000 meters. 
 A statistical evaluation discovered during deep (...