Bibliography: p. 18.
|Statement||by John E. Pahlman ... [et al.].|
|Series||Report of investigations ;, 9227, Report of investigations (United States. Bureau of Mines) ;, 9227.|
|Contributions||Pahlman, J. E.|
|LC Classifications||TN23 .U43 no. 9227, TN279 .U43 no. 9227|
|The Physical Object|
|Pagination||18 p. :|
|Number of Pages||18|
|LC Control Number||88600073|
Penetration and bit life improvements obtained with zsc concentration solutions ranged from 88 and 56 pct, respectively, to over pct and over pct, respectively, for the additives tested. Polyethylene oxide (peo) was found to be the best additive for zsc-controlled drilling because a continuous range of peo solution concentrations. Zero-surface-charge-controlled drilling for enhanced penetration and extended bit life / By Pamela J. Watson, Patrick A. Tuzinski, William H. Engelmann and J. E. (John E.) Pahlman Abstract. USA1 US13/, USA USA1 US A1 US A1 US A1 US A US A US A US ACited by: 5. The equations for penetration rate and bit life are incorporated into a drilling cost equation and the cost function is minimized over the control variables. Al-Betairi et al. () introduced a model using multiple regression analysis to predict the effects of various drilling parameters on ROP. They used the model to estimate optimum.
The book is ordered according to applications, just in the way how the jobs are emerging in practice. Zero-Surface-Charge-Controlled Drilling for Enhanced Penetration and Extended Bit Life. PDC drill bit developments have been made to achieve higher penetration rates and longer life, involving a compromise between open, light set, bits for speed, and heavy set ones for durability. Developments are described which provided the benefits of both in a revolutionary hydraulic and mechanical design. Zero-Surface-Charge-Controlled Drilling for Enhanced Penetration and Extended Bit Life. Article. Jan ; The book covers the technical and scientific areas not dealt with in other texts and. The LS has excellent penetration abilities, drilling through deep, dense and difficult overburden formations to pre-collar boreholes. Pre-collaring also provides a detailed continuous overburden sample. Once bedrock is reached, diamond drills can drill deeper for mineral exploration purposes, saving bit life and increasing efficiency.
Typical penetration rates vary anywhere from 2 ipm to 12 ipm depending on bit formula and formation. As formations become harder, the penetration rate should be reduced to achieve good bit life. In extremely broken, hard ground, drill at half RPM and weight on bit sufficient to reach 1 to 2 ipm (3 to 5 cpm). Pantera™ DPi is a hydraulic, diesel-powered, self-propelled top-hammer drill rig, and is the ideal choice for production or pre-split drilling in large quarries or open pit mines and construction sites. It offers the highest power in its class for improved penetration rates, and produces a range of drilling information, including the condition of the drill and work performed. How % Increased bit life was achieved drilling for iron ore. CASE STUDY. How these deep-hole drillers extended bit life and reduced tripping with a highly versatile drill bit. CASE STUDY. How semi-autonomous drilling during crib breaks and shift change overs increased productivity by %. Sandvik roller cone bits are optimized for service life at the maximum possible penetration rate for the drilling conditions. Carbide grade, shape & size, and cutting structure density are selected to achieve the balance between productivity and bit life. There is never a com - promise on quality. To achieve long life.