Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent
1997-07-29
1999-05-04
Tsay, Frank
Boring or penetrating the earth
With tool shaft detail
Axially telescoping shaft section
1753252, E21B 1707
Patent
active
058992820
ABSTRACT:
A deep-drilling system has a vertical tubular drill string having an upper section and a lower section, a rotatable bit at a lower end of the lower section so that when the string and bit are lowered into the ground longitudinally they form therein a bore. A drill mud is pumped at a working pressure longitudinally through the string to emerge at the lower end of the string and flow upward in the bore around the string. A hydrostatic compensator joint in the string between the sections is centered on an upright axis and has a tubular upper part, a threaded joint rigidly connecting the upper part to a lower end of the upper section, a tubular lower part, and a threaded joint rigidly connecting the lower part to an upper end of the lower part. Each part has surfaces directed radially and axially at generally complementary surfaces of the other part. The axially directed surfaces of the upper part are spaced axially from the respective surfaces of the lower part by at most 5 mm. Inter-engaging formations on the parts rotationally couple same together, and a first seal between the surfaces of the parts prevents the drilling mud inside the string and outside the string apart.
REFERENCES:
patent: 4081043 (1978-03-01), Juergens
patent: 4281726 (1981-08-01), Garrett
patent: 4336943 (1982-06-01), Chaplin
patent: 4790572 (1988-12-01), Slyker
patent: 4792000 (1988-12-01), Perkin et al.
patent: 5263682 (1993-11-01), Covert et al.
Carl Gatlin, "Petroleum Engineering", Prentice-Hall Inc., 1960. pp. 52,53,60 and 142-165.
Bourgoyne Jr., et al. "Applied Drilling Engineering", SPE, 1986. pp. 122-126.
"Enzyklopadie Naturwissenschaft and Tecknik", Moderne Industrie 1980, pp. 1233-1234. Dr.Frieder Schuh.
Gatlin "Petroleum Engineering", Prentice Hall, 1960. pp. 94,95,288 and 289.
Dubno Herbert
Tsay Frank
Wilford Andrew
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