Boring or penetrating the earth – With signaling – indicating – testing or measuring – Measuring or indicating drilling fluid rate of flow
Patent
1990-03-12
1991-06-04
Dang, Hoang C.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Measuring or indicating drilling fluid rate of flow
175 57, 175320, E21B 700
Patent
active
050206095
ABSTRACT:
In the preferred application, an acceleration compensation mass is supported in a downhole drilling related housing for independent movement along an axis in response to acceleration of the housing. A control member that moves relative to the housing in a direction parallel the axis to carry out the function of the housed apparatus is connected to a piston in a cooperating bore in the housing to displace fluid when the member moves. A second piston and cooperating bore in the housing is arranged to displace fluid when the mass moves. Fluid plumbing is arranged to connect the two hydraulic cylinders such that the mass and the member, if they move, must move in unison in opposite directions. When the housing is accelerated in the direction along the axis, both member and mass tend to move in the opposite direction relative to the housing but each piston opposes the other and no movement occurs if the pistons have effective areas proportional to the weights of the related member and mass. The member, however, can move irrespective of acceleration reaction forces in response to force applied to it relative to the housing, with the mass moving a proportional amount in the opposite direction.
Alternate embodiments include linear compensators with the mass and member connected by racks and pinions to compel the opposite direction movements and a rotary compensator includes a rotating compenator mass rotationally connected to the member by gearing to compel rotation in opposite directions relative to the housing.
REFERENCES:
patent: 2964116 (1960-12-01), Peterson
patent: 3294170 (1966-12-01), Warren et al.
patent: 3964555 (1976-06-01), Franklin
patent: 4531579 (1985-07-01), Larronde
patent: 4678045 (1987-07-01), Lyons
patent: 4802150 (1989-01-01), Russell et al.
Dang Hoang C.
Jeter John D.
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