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Shock mounted Stratapax oil well drilling bits. Final technical report

Published
United States : [publisher not identified], 1984
Springfield, Va.: National Technical Information Service, [approximately 1984]
Physical Description
microfiche : negative ; 11 x 15 cm

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Summary
Preliminary to beginning design and drafting work, an exhausting study of the literature having to do with the subjects of Stratapax bit design, construction, and application was made. These bits being relatively new in the drilling industry are in an early state of development and there is much research work being done and many results are being published. New patents issue frequently. Advertisements of the many producers are also a source of information. All of these sources were included in the study. Two principles of bit design were adopted from the study: (1) Stratapax cutting surfaces would be positioned to provide a negative rake angle in two directions; (2) each Stratapax cutter would be located so that it was required to cut the same volume of formation as every other cutter. Of course there was no precedent for the shock mounting design principle. Spring design technology was used to guide the design of the spring elements. In this preliminary study two attractive field testing areas were discovered. Since the total funds made available were limited and discussions with drilling laboratory personnel had shown that laboratory testing would leave no funds for field testing, the decision was made to forego the laboratory tests and pursue two field test situations. The first is a bit for drilling oil shale in an underground mine in Western Colorado. They drill 4 1/4 inch diameter holes about 24 feet horizontally into the face. Minimum cost per foot is the goal. The second field test opportunity is in the oil fields of central Oklahoma where drilling is expensive because of dipping, varying hardness beds which cause bits to deviate from vertical in their course. These holes are mostly 7 7/8 inch in diameter and frequently exceed 10,000 feet in depth. 6 figures.
Report Numbers
DE84011726; DOE/CE/15149-T1
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: FG01-82CE15149
OSTI Identifier 6820476
Research organization: Evans (Robert F.), Dallas, TX (USA).
View MARC record | catkey: 47341259