# US 2019/0376356 A1 · Modular force multiplier for downhole tools > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0376356 A1 - Document ID: US20190376356A1 - Status: Published application - Kind: A1 - Application number: 16/004,771 - Filed: 2018-06-11 - Published: 2019-12-12 - Earliest claimed: 2018-06-11 - Assignees: Exacta-Frac Energy Services, Inc. - Inventors: JOZE JOHN HRUPP; Lloyd Murray Dallas - Web page: https://patentgrep.com/patent/US20190376356A1 ## CPC - E21B 4/00: Drives for drilling, used in the borehole - E21B 23/00: Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells (setting of casings, screens or liners E21B43/10) - E21B 43/086: {Screens with preformed openings, e.g. slotted liners (comprising porous materials E21B43/082)} - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## 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. ## Claims ### Claim 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. ### Claim 2 A 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 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. ### Claim 3 (depends on 2) The force multiplier module as claimed in claim 2 further comprising a debris management sleeve connecting the small piston sub to a work string connection sub use to connect a work string to the force multiplier module. ### Claim 4 (depends on 2) The force multiplier module as claimed in claim 2 further comprising small cylinder fill bores in the small cylinder sleeve through which contained fluid is introduced into the small cylinder sleeve. ### Claim 5 (depends on 3) The force multiplier module as claimed in claim 3 further comprising: a bumper mandrel sleeve connected to an uphole end of the sleeve connector; a bumper mandrel stop sub connected, to an uphole end of the bumper mandrel sleeve, the bumper mandrel stop sub having a central passage; and a bumper mandrel having a bumper mandrel socket end, the bumper mandrel being received in a central passage of the bumper mandrel stop sub with the bumper mandrel socket end on a downhole side of the bumper mandrel stop sub and an uphole end of the bumper mandrel being connected to the work string connection sub. ### Claim 6 (depends on 4) The force multiplier module as claimed in claim 4 further comprising a compression spring surrounding the bumper mandrel between the bumper mandrel stop sub and the work string connection sub. ### Claim 7 A modular force multiplier, comprising: 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. ### Claim 8 (depends on 7) The modular force multiplier as claimed in claim 7 further comprising a bumper mandrel connected to the work string connection sub, the bumper mandrel having a bumper mandrel socket end. ### Claim 9 (depends on 7) The modular force multiplier as claimed in claim 7 further comprising a bumper mandrel stop sub that reciprocates on the bumper mandrel between the work string connection sub and the bumper mandrel socket end. ### Claim 10 (depends on 9) The modular force multiplier as claimed in claim 9 further comprising a bumper mandrel sleeve connected to the bumper mandrel stop sub, the bumper mandrel sleeve defining a bumper mandrel chamber in which the bumper mandrel socket end reciprocates. ### Claim 11 (depends on 7) The modular force multiplier as claimed in claim 7 wherein a downhole end of the bumper mandrel sleeve is connected to an upper sleeve connector thread of the sleeve connector. ### Claim 12 (depends on 7) The modular force multiplier as claimed in claim 7 further comprising a debris management sleeve connected to a downhole end of the work string connection sub and an uphole end of the sleeve connector. ### Claim 13 (depends on 7) The modular force multiplier as claimed in claim 7 wherein the small piston comprises a small piston inner seal that provides a fluid seal between the small piston and the large piston mandrel, and a small piston outer seal that provides a fluid seal between the small piston and the small cylinder sleeve. ### Claim 14 (depends on 13) The modular force multiplier as claimed in claim 13, wherein the small piston further comprises small cylinder fill bores and small cylinder fill plugs. ### Claim 15 (depends on 7) The modular force multiplier as claimed in claim 7, wherein the large piston comprises a large piston seal that provides a fluid seal between the large piston and an inner surface of the large cylinder sleeve. ### Claim 16 (depends on 15) The modular force multiplier as claimed in claim 15 wherein the large piston sleeve further comprises pressure equalization bores. ### Claim 17 A modular force multiplier, comprising: 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. ### Claim 18 (depends on 17) The modular force multiplier as claimed in claim 17 further comprising a compression spring between the work string connection sub and the bumper mandrel stop sub, the compression spring continuously urging the modular force multiplier to a run-in condition. ### Claim 19 (depends on 17) The modular force multiplier as claimed in claim 17 further comprising fill ports in the small cylinder sleeve for filling the small cylinder sleeve with contained fluid. ### Claim 20 (depends on 17) The modular force multiplier as claimed in claim 17 further comprising a multipart mandrel central passage through the work string connection sub, the bumper mandrel, and the large piston mandrel to permit fluid to be pumped through the modular force multiplier.