Downhole mechanism
First Claim
1. A downhole tool string component comprising:
- a first end and a second end spaced apart from the first end, and a central bore extending from the first end to the second end, the central bore for receiving and passing a fluid through the first end and the second end;
a valve mechanism disposed within the central bore, the valve mechanism operable to restrict a flow of the fluid through the central bore in a closed position and to allow the flow of the fluid through the central bore in an open position, the valve mechanism including;
a shaft;
a carrier coupled to the shaft;
a spring disposed around the shaft and configured to oppose a movement of the carrier generated by a fluid pressure of the fluid upon the carrier;
an insert having at least one port therein for the flow of fluid to pass through the insert; and
,a sidewall having at least a portion capable of expanding and contracting in a radial direction under the influence of the fluid pressure in the central bore.
3 Assignments
0 Petitions
Accused Products
Abstract
A tubular downhole tool string component having a sidewall with a fluid passageway formed therein between a first end and second end, and a valve mechanism disposed within the fluid passageway adapted to substantially cyclically build-up and release pressure within the fluid passageway such that a pressure build-up results in radial expansion of at least a portion of the sidewall and wherein a pressure release results in a radial contraction of the portion of the sidewall. The valve mechanism disposed within the fluid passageway comprises a spring. Radial expansion and contraction of the portion of the sidewall varies a weight loaded to a drill bit disposed at a drilling end of the drill string.
273 Citations
17 Claims
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1. A downhole tool string component comprising:
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a first end and a second end spaced apart from the first end, and a central bore extending from the first end to the second end, the central bore for receiving and passing a fluid through the first end and the second end; a valve mechanism disposed within the central bore, the valve mechanism operable to restrict a flow of the fluid through the central bore in a closed position and to allow the flow of the fluid through the central bore in an open position, the valve mechanism including; a shaft; a carrier coupled to the shaft; a spring disposed around the shaft and configured to oppose a movement of the carrier generated by a fluid pressure of the fluid upon the carrier; an insert having at least one port therein for the flow of fluid to pass through the insert; and
,a sidewall having at least a portion capable of expanding and contracting in a radial direction under the influence of the fluid pressure in the central bore. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A downhole tool string component comprising:
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a drill bit having a shank and a working face spaced apart from the shank; a first end and a second end spaced apart from the first end, and a central bore extending from the first end to the second end, the central bore, the central bore for receiving and passing a fluid through the first end and the second end; a valve mechanism disposed within the central bore and within the drill bit, the valve mechanism operable to restrict a flow of the fluid through the central bore in a closed position and to allow the flow of the fluid through the central bore in an open position; and a sidewall having at least a portion capable of expanding and contracting in a radial direction under the influence of a fluid pressure in the central bore. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification