SYSTEM FOR THE OPERATIONAL AND PERFORMANCE EFFICIENCY IMPROVEMENT OF WIRELINE TRACTORS
First Claim
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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.
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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
8 Citations
35 Claims
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1. A system for the removal of heat generated by one or more electrical motors in a downhole tool comprising:
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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. - View Dependent Claims (2, 3, 4, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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5. (canceled)
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6. (canceled)
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7. (canceled)
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8. (canceled)
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9. (canceled)
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23. (canceled)
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24. A downhole tractor mechanism comprising:
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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. - View Dependent Claims (25, 27, 28, 29, 30, 31)
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26. (canceled)
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32. A downhole tool actuation system comprising:
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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. - View Dependent Claims (33, 34)
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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:
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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.
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Specification