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Title: Improved high-power TSP bits

Four 3-in. (76.2-mm) diameter experimental bits utilizing large TSP cutters were manufactured in an attempt to develop improved hard rock drill bits. The bits were tested on a 2 3/8-in. (60.3-mm) downhole motor that operated at speeds up to 2,700 rpm and delivered up to 48 hp (36 kW). The TSP bits drilled Batesville marble at rates up to 550 ft/hr (168 m/hr) compared to 50 to 100 ft/hr (15 to 30 m/hr) for conventional roller cone bit drilling in this type of rock. The high penetration rates were achieved because the large cutters cut deep grooves in the rock and there was good clearance beneath the bits due to the large bit/rock standoff distance. None of the large cutters broke during the tests despite the severe drilling conditions and high power levels delivered to the bits, thus overcoming cutter breakage problems experienced with smaller TSP bits on earlier tests. The large cutter TSP bits were capable of operating at much higher power levels than the 48 hp (36 kW) delivered by the drilling motor, showing the need for improved high-power motors for use with these improved TSP bits.
Authors:
;  [1] ;  [2]
  1. Maurer Engineering Inc., Houston, TX (United States)
  2. Gas Research Inst., Chicago, IL (United States)
Publication Date:
OSTI Identifier:
93046
Report Number(s):
CONF-940113-
ISBN 0-7918-1182-4; TRN: IM9537%%89
Resource Type:
Conference
Resource Relation:
Conference: 17. American Society of Mechanical Engineers (ASME) energy-sources technology conference and exhibition (ETCE), New Orleans, LA (United States), 23-26 Jan 1994; Other Information: PBD: 1994; Related Information: Is Part Of Drilling technology -- 1994. PD-Volume 56; Vizniak, J.P. [ed.] [Maurer Engineering, Inc., Houston, TX (United States)]; PB: 280 p.
Publisher:
American Society of Mechanical Engineers, New York, NY (United States)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; BOREHOLES; WELL DRILLING; DRILL BITS; DESIGN; PERFORMANCE TESTING; PETROLEUM INDUSTRY