Downhole Linear Pump Electromagnetic Drive
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Solution Overview
Problem
Sucker rod pumps face challenges such as large surface footprint, inefficiency in deep wells, rod and tubing wear, energy loss, and environmental concerns due to steel consumption and potential fluid leakage, especially in offshore and deviated wellbore applications.
Innovation Solution
A downhole linear pump system with a motor stator and rotor producing a rotating electromagnetic field, a traveling plug for linear motion, and valves for fluid management, integrated with a motor drive for variable speed control, reducing the need for long sucker rods and minimizing surface components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If long stroke rod pump systems are used to increase production rate, then stroke length increases and SPM decreases, but the surface footprint increases and rod and tubing wear increases
Solution Approach 1:
The patent replaces the mechanical sucker rod pump system with an electric motor-driven pump system. The motor is positioned in the wellbore and driven by electromagnetic fields generated by stator windings, eliminating the need for surface-mounted mechanical components like polished rods, beams, and sucker rods. This substitution dramatically reduces the surface footprint while maintaining pumping capability.
Solution Approach 2:
The patent extracts and removes the mechanical transmission components (polished rod, beam, crank, gear reducer) from the surface equipment. Only essential components remain at the surface: the motor drive system, control electronics, and wellhead equipment. The pumping mechanism itself is relocated to the downhole environment where it can be directly driven by electromagnetic fields.
2Productivity
If long sucker rods are used to increase stroke length, then production rate increases, but rod and tubing wear increases and reliability decreases
Solution Approach 1:
The patent eliminates the mechanical sucker rod entirely by using an electric motor driven pump system. The motor is positioned in the wellbore and driven by electromagnetic fields generated by stator windings, eliminating the need for surface-mounted mechanical components like polished rods, beams, and sucker rods. This substitution dramatically reduces the surface footprint while maintaining pumping capability.
Solution Approach 2:
The patent extracts and removes the mechanical transmission components (polished rod, beam, crank, gear reducer) from the surface equipment. Only essential components remain at the surface: the motor drive system, control electronics, and wellhead equipment. The pumping mechanism itself is relocated to the downhole environment where it can be directly driven by electromagnetic fields.
3Productivity
If long sucker rods are used to increase stroke length, then production rate increases, but energy loss increases and system efficiency decreases
Solution Approach 1:
The patent replaces the mechanical transmission system with direct electromagnetic driving. The motor is positioned in the wellbore and driven by electromagnetic fields generated by stator windings, eliminating the need for mechanical transmission components. This direct drive approach eliminates energy losses associated with mechanical friction, gear transmission, and rod friction against the wellbore.
Solution Approach 2:
The patent removes the mechanical transmission chain from the system. The motor drive system is positioned at the surface and connects directly to the pump mechanism in the wellbore through electromagnetic fields, eliminating intermediate mechanical transmission elements that cause energy losses through friction and mechanical inefficiency.
4Productivity
If long sucker rods are used to increase stroke length, then production rate increases, but steel consumption increases and environmental impact increases
Solution Approach 1:
The patent replaces heavy mechanical components (sucker rods, beams, cranks, gear reducers) with an electric motor-driven system. The motor is positioned in the wellbore and driven by electromagnetic fields, eliminating the need for extensive mechanical structures. This substitution dramatically reduces steel consumption while maintaining pumping capability.
Solution Approach 2:
The patent extracts and removes the heavy mechanical transmission components from the system. Only essential components remain: the motor drive system, control electronics, and wellhead equipment. The pumping mechanism is relocated to the downhole environment, eliminating the need for long sucker rods and associated mechanical structures that consume significant steel.
5Productivity
If long sucker rods are used to increase stroke length, then production rate increases, but the system becomes more complex and difficult to operate
Solution Approach 1:
The patent replaces complex mechanical transmission systems with electromagnetic driving. The motor is positioned in the wellbore and driven by electromagnetic fields generated by stator windings, eliminating the need for mechanical transmission components. This simplification reduces system complexity while maintaining pumping capability.
Solution Approach 2:
The patent removes the complex mechanical transmission chain (polished rod, beam, crank, gear reducer) from the system. The motor drive system is positioned at the surface and connects directly to the pump mechanism through electromagnetic fields, eliminating intermediate mechanical transmission elements that increase system complexity and operational difficulty.
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
Enhances efficiency, reduces wear and energy loss, and minimizes environmental impact by reducing steel usage and potential leakage, while being more suitable for offshore and deep well applications.
Implementation Method 1
The motor stator receives electrical power and produces a rotating electromagnetic field from the electrical power
Implementation Method 2
The traveling plug may have a second threaded surface in opposing relation to the first threaded surface and threadedly engaged with the first threaded surface
Data Source
AI summary
A pump system includes a pump barrel disposed within a housing. A standing valve is disposed at a first end of a pump chamber defined within the pump barrel. A traveling valve is disposed at a second end of the pump chamber. The traveling valve is movable relative to along an axial axis and relative to the housing. A motor stator is disposed inside the housing. produces a rotating electromagnetic field upon receiving electrical power. A motor rotor is rotatably supported within the motor stator and rotates about the axial axis in response to the rotating electromagnetic field. A traveling plug is coupled to the valve body of the traveling body and arranged to move linearly along the axial axis in response to rotation of the motor rotor. The pump system can be disposed in a wellbore to lift fluids up a tubing in the wellbore.