# US 2019/0316433 A1 · System for the operational and performance efficiency improvement of wireline tractors > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0316433 A1 - Document ID: US20190316433A1 - Status: Published application - Kind: A1 - Application number: 16/462,239 - Filed: 2017-11-20 - Published: 2019-10-17 - Earliest claimed: 2016-11-21 - Inventors: Sam Schroit; Jeffrey WENSRICH - Web page: https://patentgrep.com/patent/US20190316433A1 ## CPC - 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) - F04B 53/08: Cooling; Heating; Preventing freezing - E21B 23/14: for displacing a cable or a cable-operated tool, e.g. for logging or perforating operations in deviated wells - E21B 47/017: Protecting measuring instruments - F04B 47/06: having motor-pump units situated at great depth - F04B 53/00: Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00 - F15B 11/16: with two or more servomotors - F16H 1/22: with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts - F16H 48/20: Arrangements for suppressing or influencing the differential action, e.g. locking devices - H02K 5/132: Submersible electric motors (H02K5/128 takes precedence) - H02K 7/116: with gears - H02K 9/193: with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium - E21B 17/1021: {with articulated arms or arcuate springs} - E21B 23/001: {Self-propelling systems or apparatus, e.g. for moving tools within the horizontal portion of a borehole} - F15B 2211/465: Flow control with pressure compensation - F15B 2211/7053: Double-acting output members - F15B 2211/71: Multiple output members, e.g. multiple hydraulic motors or cylinders - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR - F16H: GEARING - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract The invention discloses systems for improving performance and operational efficiency of wireline tractors. A cooling system improves power capabilities of electrical motors mounted in wheels, which are mounted on a linkage pivotably connected to an arm extended from a tractor tool body, in an in-line arm configuration. The linkage and arm mechanism significantly improve the tractor's ability to traverse wellbore obstructions. The hydraulic system of the tractor ensures adequate wellbore centralization ## Claims ### Claim 1 A system for the removal of heat generated by one or more electrical motors in a downhole tool comprising: a hydraulic pump; an output hydraulic passageway routed from the pump outlet that provides hydraulic fluid through a section of the downhole tool containing the one or more electrical motors; a return hydraulic passageway routed from the pump inlet that receives hydraulic fluid through a section of the downhole tool containing the one or more electrical motors; one or more heat exchanging areas of the downhole tool, arranged to receive hydraulic fluid from the hydraulic pump by way of the output hydraulic passageway, transfer heat to the outside wellbore environment, and deliver hydraulic fluid to the pump by of way of the return hydraulic passageway. ### Claim 2 (depends on 1) The system of claim 1, wherein the output hydraulic passageway consists of multiple hydraulic channels. ### Claim 3 (depends on 1) The system of claim 1, wherein the return hydraulic passageway consists of multiple hydraulic channels. ### Claim 4 (depends on 1) The system of claim 1, wherein the return hydraulic passageway is the hydraulic sump of the downhole tool. ### Claim 5 (canceled) ### Claim 6 (canceled) ### Claim 7 (canceled) ### Claim 8 (canceled) ### Claim 9 (canceled) ### Claim 10 (depends on 1) The system of claim 1, wherein the electrical motor is mounted inside the wheel of downhole tractor. ### Claim 11 (depends on 1) The system of claim 1, wherein the electrical motor is mounted inside the arm of a downhole tractor. ### Claim 12 (depends on 1) The system of claim 1, wherein the return hydraulic passageway comprises a passageway through the rotor center axis of an electrical motor. ### Claim 13 (depends on 1) The system of claim 1, wherein the return hydraulic passageway comprises a passageway through the stator of an electrical motor. ### Claim 14 (depends on 1) The system of claim 1, wherein the return hydraulic passageway comprises a passageway through the annular space exterior to the outer diameter of a rotor and inside the inner diameter of a stator of an electrical motor. ### Claim 15 (depends on 1) The system of claim 1, wherein the return hydraulic passageway comprises a passageway passed the stator of an electrical motor. ### Claim 16 (depends on 1) The system of claim 1, wherein the return hydraulic passageway comprises a helical passageway around stator of an electrical motor. ### Claim 17 (depends on 1, 12, 13, 14, 15, 16) The system of claim 1 wherein the return hydraulic passageway comprises a passageway comprised of all passageways of claims 12 through 16, or a combination thereof. ### Claim 18 (depends on 1) The system of claim 1, wherein the output hydraulic passageway comprises a passageway through the rotor center axis of an electrical motor. ### Claim 19 (depends on 1) The system of claim 1, wherein the output hydraulic passageway comprises a passageway through the stator of an electrical motor. ### Claim 20 (depends on 1) The system of claim 1, wherein the output hydraulic passageway comprises a passageway through the annular space exterior to the outer diameter of a rotor and inside the inner diameter of a stator of an electrical motor. ### Claim 21 (depends on 1) The system of claim 1, wherein the output hydraulic passageway comprises a passageway passed the stator of an electrical motor. ### Claim 22 (depends on 1) The system of claim 1, wherein the output hydraulic passageway comprises a helical passageway around stator of an electrical motor. ### Claim 23 (canceled) ### Claim 24 A downhole tractor mechanism comprising: an arm radially extendable from the tractor tool body; a linkage pivotably mounted to the extendable end of the arm at a single pivot point; a first drive wheel mounted to the linkage at a first position from the pivot point and a second drive wheel mounted to the linkage at a second and opposing position from the pivot point. ### Claim 25 (depends on 24) The mechanism of claim 24, wherein the drive wheels comprise electrical motors. ### Claim 26 (canceled) ### Claim 27 (depends on 24) The mechanism of claim 24, wherein the distance of the first drive wheel from the pivot point differs from the distance of the second drive wheel from the pivot point. ### Claim 28 (depends on 24) The mechanism of claim 24, wherein the drive wheels comprise of motors. ### Claim 29 (depends on 24) The mechanism of claim 24, further comprising a gear train within radially extendable arm; gear train within radially extendable arm arranged to transmit power to a gear train within the linkage; gear train within the linkage arranged to transmit power to drive wheels. ### Claim 30 (depends on 29) The mechanism of claim 29, further comprising a gear differential within the linkage gear train. ### Claim 31 (depends on 30) The mechanism of claim 30, wherein the gear differential is a limited slip differential. ### Claim 32 A downhole tool actuation system comprising: first and second radially extendable arms on opposing sides of a downhole tool body; the first radially extendable arm actuated by a first actuator, including a piston and actuation cylinder; the second radially extendable arm actuated by a second actuator, including a piston and actuation cylinder; a hydraulic passageway routed from a single pump, to each actuation cylinder; a flow regulator on the inlet hydraulic passageway of each hydraulic actuation cylinder, disposed to regulate flow into the cylinder, such that the volume of fluid in the first actuation cylinder is within a desired range of the volume in the second actuation cylinder. ### Claim 33 (depends on 32) The system of claim 32 wherein the flow regulator comprises a variable orifice which adjusts based on a pressure differential of its inlet and outlet ports. ### Claim 34 (depends on 32) The system of claim 32, wherein the radially extendable arms are arms of a downhole tractor. ### Claim 35 A method of centralizing an in-line arm downhole tractor in a wellbore, the in-line arm downhole tractor including a first radially extendable arm disposed to actuate upon pressurization of a first actuation cylinder, a second radially extendable arm disposed to actuate upon pressurization of a second actuation cylinder, a first flow regulator disposed to regulate flow into the first actuation cylinder, a second flow regulator disposed to regulate flow into the second actuation cylinder and a pump, the method comprising: providing an in-line arm downhole tractor in a wellbore; powering the pump to provide fluid to the first and second actuation cylinders through the first and second flow regulators; regulating the fluid flowrate to each actuation cylinder such that fluid volume in the first actuation cylinder is similar in volume to the fluid in the second actuation cylinder; and positioning the in-line arm downhole tractor toward the wellbore central axis.