Self-Propelled Plunger With Energy Storage Spring
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Solution Overview
Problem
Conventional plunger lift systems face difficulties in oil wells with high gas-liquid ratios, requiring shut-in periods for downhole pressure buildup, and struggle to operate effectively in environments with insufficient reservoir energy to lift fluids to the surface.
Innovation Solution
A self-propelled plunger system with a housing and a spring that stores energy during downhole travel and releases it to assist in fluid displacement uphole, utilizing a propeller and clutch mechanism to change rotation direction and enhance lifting efficiency, allowing operation at reduced downhole pressures and shorter shut-in times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional plunger lift systems are used in oil wells with high gas-liquid ratios, then fluid can be transported to the surface, but shut-in periods are required for downhole pressure buildup and the system cannot operate effectively with insufficient reservoir energy
Solution Approach 1:
The spring is pre-compressed during the downhole travel phase to store potential energy before the uphole trip. This preliminary energy storage eliminates the need for shut-in periods, as the spring is already charged and ready to assist fluid displacement immediately upon reaching the production zone
Solution Approach 2:
The system uses the kinetic energy from the plunger's own downhole travel to compress the spring and store energy, which then assists the same plunger during its uphole travel. The system serves itself by converting the energy from descent into the lifting assistance needed for ascent, eliminating external energy requirements
2Reliability
If conventional plunger lift systems operate in environments with insufficient reservoir energy, then the system cannot lift fluids to the surface, but adding energy storage mechanisms increases device complexity
Solution Approach 1:
The spring energy storage mechanism is integrated within the plunger housing itself, merging the energy storage function with the existing plunger structure. The spring, shaft, and propeller are combined into a single compact assembly that fits within the plunger, avoiding additional external components and minimizing structural complexity
Solution Approach 2:
The system uses fluid dynamics principles where the propeller interacts with the surrounding fluid to rotate the shaft and compress the spring during downhole travel. This passive hydraulic interaction converts fluid kinetic energy into spring potential energy without requiring mechanical actuators or complex control systems
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
Enables efficient fluid lifting with reduced shut-in time or no shut-in time, operating in environments where conventional systems fail due to insufficient reservoir energy, by converting stored potential energy into kinetic energy to assist in fluid displacement.
Implementation Method 1
a spring positioned within the cavity. The spring may be configured to transition from a compressed state to an expanded state during uphole travel of the housing to displace the volume of fluid uphole of the housing
Implementation Method 2
storing energy within the spring while lowering the plunger from the surface to the downhole position and releasing energy stored within the spring when the plunger travels uphole
Implementation Method 3
A propeller may be configured to rotate in a first direction during downhole travel of the housing and in a second direction, opposite the first direction, during uphole travel of the housing
Data Source
AI summary
Artificial lift systems, methods, and apparatuses are described. An example artificial lift system may include a plunger have an energy-storing component to store energy as the plunger descends through a wellbore and release the stored energy as the plunger ascends through the wellbore. The energy-storage component may be a spring. The spring may be compressed in response to rotation of a propeller coupled to the spring. The propeller may rotate in a first direction in response to interaction of the propeller and a liquid in the wellbore as the plunger descends. The spring may expand during uphole movement of the plunger to rotate the propeller in a second direction, opposite the first direction, and assist in lifting the plunger to the surface.