Rotating Piston Housing Downhole Hydraulic Pump
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Solution Overview
Problem
Downhole hydraulic pumps face limitations in spatial restrictions, power supply, efficiency, durability, and maintenance challenges due to spatial constraints and limited power, which hampers their ability to provide sufficient driving force and speed for downhole operations, leading to reduced operating times and increased costs.
Innovation Solution
A downhole hydraulic pump design featuring a cam shaft, radially arranged pistons, inlet and outlet valves, and piston springs, with a unique configuration of multiple pistons and housings arranged in an asterisk shape to maximize fluid power, rotational speed, and internal pressure, utilizing ceramic ball valves and a filter unit to enhance efficiency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional hydraulic pump with fixed piston housing is used, then the structure is simple, but the fluid power output is insufficient due to spatial restrictions in the borehole
Solution Approach 1:
The piston housing is made rotatable relative to the pump housing, allowing dynamic adjustment of the piston arrangement. This enables the pump to optimize its fluid power output by rotating the piston housing to different angular positions, thereby adapting to spatial constraints and maximizing power delivery within the limited borehole environment.
Solution Approach 2:
The invention introduces rotational freedom in the radial direction by allowing the piston housing to rotate around the cam shaft axis. This adds a rotational dimension to the previously fixed linear arrangement, enabling the pump to achieve higher fluid power output by optimizing the spatial configuration of pistons without increasing the axial length of the pump.
2Productivity
If the pump operates at higher speeds to increase productivity, then the operating time is extended, but wear on moving parts increases reducing durability
Solution Approach 1:
The clearance distance between the piston side wall and the inner wall of the piston housing is optimized to below ten micrometers. This precise parameter control reduces internal leakage and improves hydraulic efficiency, allowing the pump to operate at higher speeds with reduced wear on moving parts, thereby extending durability while maintaining high productivity.
3Power
If the clearance distance between piston and housing is reduced to improve efficiency, then fluid power increases, but manufacturing precision requirements increase
Solution Approach 1:
The clearance distance is precisely controlled to be below ten micrometers through optimized manufacturing processes. This parameter optimization achieves high fluid power efficiency by minimizing internal leakage while maintaining feasible manufacturing tolerances. The specific clearance value represents an optimal balance between hydraulic efficiency and manufacturability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The improved pump design achieves higher fluid power output, increased rotational speed, and enhanced durability, overcoming spatial and power limitations, thereby extending downhole operating times and reducing maintenance costs.
Implementation Method 1
a piston spring arranged in the pump housing for moving the piston away from the piston housing
Implementation Method 2
the displacement of fluid through the piston chambers is provided by a rotating cam lobe forcing the pistons to move in a cyclic manner
Implementation Method 3
pump housing, a cam shaft rotatably arranged in the pump housing... for providing fluid pressure during downhole operations
Data Source
AI summary
The present invention relates to a downhole hydraulic pump for providing fluid pressure during downhole operations, comprising a pump housing, a cam shaft rotatably arranged in the pump housing and having a longitudinal spin axis, the cam shaft comprising a shaft and a cam lobe arranged on the shaft, a radially arranged piston having a housing end and a cam end, a piston housing arranged in the pump housing, an inlet valve arranged in an inlet in the piston housing, an outlet valve arranged in an outlet in the piston housing, and a piston spring arranged in the pump housing for moving the piston away from the piston housing, wherein the piston housing is rotatably connected to the pump housing enabling rotation of the piston housing around a piston housing rotation axis parallel to the longitudinal spin axis of the cam shaft.