Fluid-Separating Pistons for Abrasive Pressure Exchange
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Solution Overview
Problem
Industrial hydraulic systems face increased maintenance and repair costs due to wear from abrasive, caustic, or acidic fluids, particularly in high-pressure applications like hydraulic fracturing, where proppants in fracking fluids accelerate pump wear, leading to reduced equipment lifespan and downtime.
Innovation Solution
A pressure exchange device with a piston system that separates clean and dirty fluid streams, allowing pressure transfer from a high-pressure clean fluid to a low-pressure dirty fluid while preventing contamination and minimizing wear on equipment, using a combination of tanks, pistons, and valve devices to manage fluid flow and pressure exchange efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If high-pressure pumps are used to pressurize fracking fluid containing proppant, then the required pressure for hydraulic fracturing is achieved, but wear on pump components increases substantially
Solution Approach 1:
The system divides the fluid pressurization function into two separate stages: a first pump pressurizes clean fluid to high pressure, while a second pump handles the abrasive fracking fluid at lower pressure. This segmentation allows each pump to operate under optimized conditions, preventing proppant-laden fluid from damaging the first pump while still achieving the required high pressure for fracturing operations.
Solution Approach 2:
Clean fluid acts as an intermediary medium that transfers pressure to the fracking fluid through a pressure exchange mechanism. The clean fluid is pressurized by the first pump and then uses its pressure energy to pressurize the fracking fluid in the second pump, reducing the workload and wear on the second pump while maintaining system efficiency.
2Productivity
If pumps handle abrasive fracking fluid continuously, then productivity is maintained, but maintenance frequency increases
Solution Approach 1:
The pumping system is segmented into two independent pumping circuits: one handling clean pressurization fluid and another handling abrasive fracking fluid. This allows the clean fluid pump to operate continuously without wear from proppant, while the fracking fluid pump operates under reduced stress, thereby extending overall system productivity and reducing maintenance interruptions.
3Productivity
If proppant-laden fluid is pressurized directly, then fracturing function is achieved, but wear on internal components increases
Solution Approach 1:
The system separates the pressurization of clean fluid from the pressurization of proppant-laden fracking fluid by using two independent pumps. The first pump handles only clean fluid, avoiding abrasive wear entirely, while the second pump handles the abrasive fluid but at reduced pressure requirements, thereby minimizing wear on components exposed to proppant.
Solution Approach 2:
Clean fluid serves as a pressure intermediary that transfers energy to the fracking fluid system without being contaminated by proppant. This intermediary approach allows the fracking fluid to be pressurized indirectly, reducing the mechanical stress and abrasive wear on pump components that handle the proppant-laden fluid.
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 reduces wear on high-pressure pumps and valves by isolating abrasive fluids, extending equipment lifespan, minimizing downtime, and lowering maintenance costs, while also potentially eliminating the need for heating steps in fracking fluid preparation.
Implementation Method 1
The piston may be configured to separate the clean fluid from the downhole fluid to at least partially prohibit fluid the downhole fluid from traveling from the dirty side to the clean side
Implementation Method 2
The valve device may be configured to selectively place the clean fluid at the higher pressure in communication with the downhole fluid at the lower pressure through the piston to pressurize the downhole fluid to a second higher pressure
Data Source
AI summary
Pistons and related methods may be configured to separate fluids and to at least partially prohibit one fluid from traveling to one side of the piston from another side of the piston. Pressure exchange devices and systems may include such pistons.