Double-Acting Shock Damper for a Downhole Assembly
First Claim
1. A downhole assembly, including:
- a downhole tool;
a downhole force-creating device;
a shock damper for the force generated from the force-creating device, the shock damper including;
a hollow housing including an annular shoulder near each end and extending radially inward from the housing;
a mandrel located at least partially inside the housing to form an annulus between the mandrel and the housing, the mandrel including an annular shoulder near each end and extending radially outward from the mandrel;
a spring located in an annular cavity formed by the annulus and between both the housing shoulders and the mandrel shoulders;
the mandrel being movable relative to the housing to an expanded position in one direction and to a compressed position in the other direction; and
the spring being compressible by a housing shoulder on one end and a mandrel shoulder on the opposite end as the mandrel moves between the expanded and compressed positions, the compression of the spring resisting relative movement between the mandrel and the housing and absorb the force moving the mandrel.
1 Assignment
0 Petitions
Accused Products
Abstract
A downhole assembly, including a downhole tool, a downhole force-creating device, and a shock damper. The shock damper includes a hollow housing including an annular shoulder near each end and extending radially inward from the housing. The damper also includes a mandrel located at least partially inside the housing to form an annulus between the mandrel and the housing, the mandrel including an annular shoulder near each end and extending radially outward from the mandrel. A spring is located in an annular cavity formed by the annulus and between both the housing shoulders and the mandrel shoulders. The mandrel is movable relative to the housing to an expanded position in one direction and to a compressed position in the other direction.
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Citations
20 Claims
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1. A downhole assembly, including:
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a downhole tool; a downhole force-creating device; a shock damper for the force generated from the force-creating device, the shock damper including; a hollow housing including an annular shoulder near each end and extending radially inward from the housing; a mandrel located at least partially inside the housing to form an annulus between the mandrel and the housing, the mandrel including an annular shoulder near each end and extending radially outward from the mandrel; a spring located in an annular cavity formed by the annulus and between both the housing shoulders and the mandrel shoulders; the mandrel being movable relative to the housing to an expanded position in one direction and to a compressed position in the other direction; and the spring being compressible by a housing shoulder on one end and a mandrel shoulder on the opposite end as the mandrel moves between the expanded and compressed positions, the compression of the spring resisting relative movement between the mandrel and the housing and absorb the force moving the mandrel. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of dampening the shock transferred to a downhole assembly, including:
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transferring the force from the shock to a mandrel located at least partially inside a hollow housing to move the mandrel relative to the housing between an expanded position in one direction and to a compressed position in the other direction; and resisting the movement of the mandrel between both the expanded position and the compressed position by compressing a spring to dampen the shock transferred to the downhole assembly. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A shock damper for a downhole force-creating device, the shock damper including
a hollow housing including an annular shoulder near each end and extending radially inward from the housing; -
a mandrel located at least partially inside the housing to form an annulus between the mandrel and the housing, the mandrel including an annular shoulder near each end and extending radially outward from the mandrel; a spring located in an annular cavity formed by the annulus and between both the housing shoulders and the mandrel shoulders; the mandrel being movable relative to the housing to an expanded position in one direction and to a compressed position in the other direction; and the spring being compressible by a housing shoulder on one end and a mandrel shoulder on the opposite end as the mandrel moves between the expanded and compressed positions, the compression of the spring resisting relative movement between the mandrel and the housing and absorb the force moving the mandrel. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification