Hydraulic motion compensating apparatus

Details Hydraulic motion compensating apparatus Hydraulic motion compensating apparatus

1975-09-02

1978-03-07

Saifer, Robert W.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

92 26, 175 5, 188 67, B66D 148

Patent

active

RE0295647

ABSTRACT:
A compensating apparatus is suspended from a divided crown block mounted on a derrick of a floating drilling barge, the compensating apparatus including a single cylinder extending vertically between and carrying divided travelling block sheaves on opposite sides thereof, with drawwork lines passing over the divided crown block sheaves and divided travelling block sheaves, and with the upper portion of the cylinder extending between such lines and adapted to move upwardly between the crown block sheaves without interference. A piston structure, forming part of the compensating apparatus, is slidable in the cylinder, being connected to a hook, or the like, from which a running string, such as a drilling string, is suspended extends into an underlying well bore, liquid under pressure in the cylinder acting on the piston structure to support part or all of the weight of the running string. The piston structure and cylinder can be locked together mechanically when in a fully contracted condition to render the compensating apparatus ineffective.

REFERENCES:
patent: 215985 (1879-05-01), Snowden
patent: 2565730 (1951-08-01), Johnston et al.
patent: 2851995 (1958-09-01), Westcott
patent: 3100630 (1963-08-01), Kummel
patent: 3146680 (1964-09-01), Hutter et al.
patent: 3399603 (1968-09-01), Cagle
patent: 3678805 (1972-07-01), Weyman
patent: 3687205 (1972-08-01), Mori

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