Boring or penetrating the earth – With signaling – indicating – testing or measuring – Signaling or indicating condition of cutting in cuttings...
Patent
1996-03-18
1998-07-28
Dang, Hoang C.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Signaling or indicating condition of cutting in cuttings...
175 59, 175 60, 175214, E21B 4900
Patent
active
057851310
ABSTRACT:
A borehole drilling apparatus has a jacket attachable to a well head and through which a drill rod passes and which carries pressurized drilling fluid to a working end of the drill rod and out into an annulus of the borehole. The jacket has a drill rod seal and an outlet port leading from the interior of the jacket to a pressure regulator. The pressure regulator comprises an annular space through which fluid can flow from an inlet to an outlet. The annular space is defined between an inner rod and a surrounding elastomer pipe. In use, the elastomer pipe is squeezed radially inwards toward the inner rod by fluid pressure maintained between the outside of the elastomer pipe and a surrounding housing. A sampling system is in communication with the outlet port at a location upstream of the regulator. The sampling system intercepts a proportion of the drilling fluid passing to the regulator for enabling sorption pressures, gas contents, bubble points or other characteristics of the return fluid and entrained contents to be determined.
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S. Rahman et al., "Drilling a Horizontal Well Through Coal Seams While Maintaining a Constant Wellbore Pressure", The Australian Coal Journal, No. 31, pp. 33-42; 1991.
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