Modular force multiplier for downhole tools
First Claim
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1. A force multiplier module, comprising a small piston sub connected to a work string, the small piston sub having a small piston that reciprocates, in response to movement of the work string, on a large piston mandrel within a small piston sleeve, and a large piston on an end of the large piston mandrel that reciprocates within a large piston sleeve in response to contained fluid urged by corresponding reciprocation of the small piston.
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Abstract
A modular force multiplier converts a push-down force applied to a work string from the surface into a multiplied linear force that can be used to operate downhole tools to perform tasks requiring the application of linear force.
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Citations
20 Claims
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1. A force multiplier module, comprising a small piston sub connected to a work string, the small piston sub having a small piston that reciprocates, in response to movement of the work string, on a large piston mandrel within a small piston sleeve, and a large piston on an end of the large piston mandrel that reciprocates within a large piston sleeve in response to contained fluid urged by corresponding reciprocation of the small piston.
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2. A force multiplier module, comprising:
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a small piston sub connected on one end to a debris management sleeve, the small piston sub including a small piston surrounding, a central passage therethrough; a small cylinder sleeve having small cylinder sleeve anchors that pass through small cylinder sleeve anchor slots in the small piston sub, the small cylinder sleeve surrounding the small piston; a sleeve connector to which the small cylinder sleeve anchors are connected; a large cylinder sleeve connected to a downhole end of the small cylinder sleeve, the large cylinder sleeve having at least one fluid port adjacent a central passage therethrough; a large piston mandrel that extends through the central passage in the large cylinder sleeve, a central passage in the sleeve connector and the central passage in the small piston sub; and a large piston on an end of the large piston mandrel, the large piston being received in the large piston sleeve. - View Dependent Claims (3, 4, 5, 6)
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7. A modular force multiplier, comprising:
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a work string connection sub; and at least one force multiplier module connected to the work string connection sub, the at least one force multiplier module comprising; a small piston sub connected on one end to a debris management sleeve, the small piston sub including a small piston surrounding a central passage therethrough; a small cylinder sleeve having small cylinder sleeve anchors that pass through small cylinder sleeve anchor slots in the small piston sub, the small cylinder sleeve surrounding the small piston; a sleeve connector to which the small cylinder sleeve anchors are connected; a large cylinder sleeve connected to a downhole end of the small cylinder sleeve, the large cylinder sleeve having at least one fluid port adjacent a central passage therethrough; a large piston mandrel that extends through the central passage in the large cylinder sleeve, a central passage in the sleeve connector and the central passage in the small piston sub; and a large piston on an end of the large piston mandrel, the large piston being received in the large piston sleeve; whereby urging the small piston sub to slide over the large piston mandrel forces contained fluid through ports in the large cylinder sleeve to urge corresponding movement of the large piston. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A modular force multiplier, comprising:
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a work string connection sub; a bumper mandrel connected to the work string connection sub, the bumper mandrel having a bumper mandrel socket end; a bumper mandrel stop sub that reciprocates on the bumper mandrel between the work string connection sub and the bumper mandrel socket end; a bumper mandrel sleeve connected to a downhole end of the bumper mandrel stop sub, the bumper mandrel sleeve defining a bumper mandrel chamber in which the bumper mandrel socket end reciprocates; a sleeve connector connected to a lower end of the bumper mandrel sleeve; a small cylinder sleeve connected on one end to the sleeve connector; a large cylinder sleeve connected to an opposite end of the small cylinder sleeve; a large piston adapted to reciprocate in a large piston chamber of the large cylinder sleeve, the large piston having a large piston mandrel that extends through central passages in the large cylinder sleeve and the sleeve connector; a small piston sub having a small piston surrounding a central passage therethrough, the small piston being adapted to reciprocate on the large piston mandrel within the small cylinder sleeve; and a debris management sleeve connecting the small piston sub to the work string connection sub; whereby manipulating the work string to urge movement of the small piston sub moves the small piston to force contained fluid in the small piston sleeve through ports in the large cylinder sleeve, to urge corresponding movement of the large piston. - View Dependent Claims (18, 19, 20)
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Specification