Overpressure Mitigation via Real-Time Pressure Rate Monitoring
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Solution Overview
Problem
During hydraulic fracturing operations, fluid hammer effects can occur due to downhole flow stoppages, causing damage to wellbore and surface equipment, as conventional systems lack real-time downhole pressure sensing and rate-of-change threshold detection to prevent overpressure.
Innovation Solution
A system with a downhole pressure sensor providing measurements to overpressure mitigation circuitry, which processes the data to control fluid pumps and stop operation when a rate of change threshold is exceeded, preventing fluid hammer effects by identifying flow stoppages early and reducing peak pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time downhole pressure monitoring and rate-of-change detection systems are implemented, then fluid hammer effects are mitigated and equipment damage is prevented, but device complexity and cost increase
Solution Approach 1:
The system performs preliminary action by continuously monitoring downhole pressure and calculating rate of change before fluid hammer damage can occur. The overpressure mitigation system detects potential flow stoppages early by tracking pressure changes, allowing the pump controller to reduce pump rate or shut down the pump before dangerous pressure spikes develop, thereby preventing equipment damage proactively rather than reactively
Solution Approach 2:
The system implements feedback by using downhole pressure sensor measurements to continuously update pump control decisions. The pressure sensor data feeds back to the pump controller, which adjusts pump operation based on real-time downhole conditions, creating a closed-loop control system that adapts to changing wellbore conditions and prevents overpressure events
2Object-affected harmful factors
If downhole pressure sensors and control systems are added, then flow stoppages are detected early and peak pressures are reduced, but manufacturing cost and installation complexity increase
Solution Approach 1:
The system uses an intermediary approach by placing a downhole pressure sensor in the wellbore fluid to indirectly detect flow stoppages. Rather than directly detecting the flow stoppage event, the sensor measures pressure changes caused by the stoppage, which are then processed by surface equipment to trigger pump control actions, allowing detection without complex downhole electronics
3Productivity
If continuous fluid pumping is maintained without interruption, then productivity is maximized, but risk of fluid hammer damage increases during flow stoppages
Solution Approach 1:
The system applies dynamics by making pump operation adaptive rather than static. The pump controller dynamically adjusts pump rate based on real-time downhole pressure conditions, maintaining high productivity during normal operation but automatically reducing or stopping pump rate when flow stoppages are detected, thereby balancing productivity maximization with damage prevention
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 system effectively mitigates fluid hammer effects by stopping fluid flow at the time of downhole flow stoppage, reducing damage to wellhead and equipment, and minimizing peak pressures through real-time monitoring and control.
Implementation Method 1
a downhole pressure sensor providing measurements to overpressure mitigation circuitry
Data Source
AI summary
A system for mitigating or preventing overpressure in a well system includes a controller and one or more sensors. The overpressure mitigation system controller obtains downhole pressure measurements using a downhole pressure sensor. A rate of change of the downhole pressure is determined based on the downhole pressure measurements, and the rate of change is compared with a rate-of-change threshold. The rate-of-change threshold is determined uniquely for each well system in real time based on a flow rate of the fluid, a volume of the fluid, a proppant concentration in the fluid, a speed of sound in the fluid, and/or other features of the fluid, the proppant, the wellbore, a casing, or other components of the well system.