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TitleStudy of hole deviation in diamond drilling
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AuthorMining Research Centre Mines Branch Department of Energy, Mines and Resources
SourceCanada Mines Branch, Publication 883, 1975, 122 pages, https://doi.org/10.4095/308018
Year1975
PublisherCanada Mines Branch
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Released1975 01 01; 2018 07 09
Abstract(Summary)
In this report the state of the art of controlling and predicting hole deviation in the diamond drilling industry is assessed. Theoretical work relating to hole deviation which has been carried out by the oil and gas industry is studied to determine its applicability to diamond drilling. In particular, Lubinski and Wood's equilibrium angle concept is examined. In core drilling, the presence of a reaming shell close behind the bit implies that an equilibrium angle cannot exist. A new mathematical model which takes into account the reaming shell and permits calculation of the hole profile for an isotropic bit penetrating isotropic ground is developed. It is shown that a continuously curving hole should be expected when core drilling with a reamer. Parametric studies have been carried out using the theoretical reamer model to demonstrate the relative importance of the various factors which could be used for directional control. Bit weight, hole clearance and corebarrel stiffness are the most important and potentially useful variables. Mechanisms of hole deviation in complex geological conditions are identified and the applicability of theories to various ground conditions is considered. Data obtained from surveyed drill holes are studied in the light of the theoretical concepts. Experimental and field work necessary to test these concepts are suggested, and recommendations for future research into the problem of hole deviation are made.
GEOSCAN ID308018