Submersible Reciprocating Pump Torque Reversing Device
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Solution Overview
Problem
Existing oil well pump units are inefficient in rotary to linear force transmission, bulky, and not suitable for well conditions with multiple inflection points, large slopes, and high lift, requiring frequent maintenance and having a short service life.
Innovation Solution
A submersible reciprocating oil well pump unit with a borehole torque reversing device that converts rotary force from a submersible motor into linear reciprocating force, eliminating the need for a long pumping rod, using a screw pair and compression springs for balanced loading and automatic commutation, and featuring a reliable sealing system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a land-type driving device with long pumping rod is used to transmit rotary force to linear reciprocating force, then the pump can operate in conventional well conditions, but the transmission process becomes complex and inefficient
Solution Approach 1:
The patent merges the motor, torque reversing device, and pump into a single integrated submersible assembly. The motor is positioned directly above the pump with the torque reversing device connecting them, eliminating the need for separate land-type driving equipment and long pumping rods. This integration simplifies the overall system while maintaining efficient force transmission from rotary to linear motion.
Solution Approach 2:
The patent replaces the complex land-type mechanical transmission system with a compact borehole torque reversing device that directly converts rotary motion to linear reciprocating motion within the wellbore. This substitution eliminates long pumping rods and complex ground-based machinery, reducing mechanical complexity while improving transmission efficiency.
2Reliability
If a land-type pump assembly is used, then the pump can handle conventional well conditions, but it occupies large ground area and requires frequent maintenance
Solution Approach 1:
The submersible pump assembly is designed to operate independently within the wellbore, with all necessary components (motor, torque reversing device, pump) integrated into a single self-contained unit. This eliminates the need for complex ground-based support equipment and reduces maintenance requirements by minimizing external connection points and mechanical interfaces that would require servicing.
3Length of moving object
If a long pumping rod is used to transmit force, then the pump can reach deep wells, but the system becomes bulky and inefficient
Solution Approach 1:
The patent extracts and eliminates the long pumping rod from the system by implementing a direct-drive submersible configuration. The motor is positioned immediately above the pump, with only a short torque reversing device connecting them. This extraction of the lengthy transmission component removes the source of inefficiency while maintaining the ability to reach deep wells through the submersible design.
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 solution enables efficient and reliable operation in challenging well conditions, with improved power output, reduced maintenance needs, and extended service life, while maintaining pressure balance and ensuring high operational reliability.
Implementation Method 1
The borehole torque reversing device comprises: a driving rod and a screw pair comprising a screw rod and a guide nut
Implementation Method 2
An upstroke compression spring and a downstroke compression spring are disposed on two ends of the driving rod
Data Source
AI summary
A submersible reciprocating oil well pump unit, including: a control cabinet, a rotary type submersible motor, a borehole torque reversing device, a borehole reciprocating pump, a submersible cable, a first joint, a second joint, and an oil pipe. The control cabinet is disposed at wellhead and connected to the rotary type submersible motor submerged in a downhole sleeve via the submersible cable. The motor shaft is connected to one end of the screw rod of the screw pair of the borehole torque reversing device via the first joint. One end of the driving rod is connected to a push-pull rod of the borehole reciprocating pump via the second joint. The oil outlet is connected to the oil pipe. The borehole torque reversing device is adapted to drive the control cabinet to commutate automatically according to set loading values.