Wellhead Valve Control With Pressure Equalization and Grease Metering
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Solution Overview
Problem
Current fluid systems in oil and gas operations, particularly in hydraulic fracturing, face challenges in efficiently managing pressure differentials and lubrication of valves, leading to potential valve damage and operational inefficiencies.
Innovation Solution
A system comprising a manifold assembly, zipper modules, fracturing lines, and a grease delivery and metering system, controlled by a controller with integrated pressure sensors and actuators, ensures precise pressure equalization and lubrication of valves, preventing damage and enhancing operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure equalization is implemented before valve operation, then valve damage is prevented, but system complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The system performs pressure equalization before valve operation by detecting pressure differentials across the valve and equalizing pressures through controlled fluid flow. This preliminary action prevents valve damage by ensuring safe operating conditions are established before the valve is actuated, thereby protecting the valve without requiring continuous complex monitoring during operation.
Solution Approach 2:
The system uses pressure sensors to continuously monitor pressure differentials across the valve and provides feedback to the control system. This feedback mechanism enables automatic adjustment of fluid flow to maintain safe pressure conditions, protecting the valve while using a relatively simple control logic that reacts to sensor inputs.
2Productivity
If continuous monitoring and control is implemented, then operational efficiency is improved, but energy consumption increases
Solution Approach 1:
The system implements periodic monitoring and control actions rather than continuous operation. The controller checks pressure differentials at intervals and activates equalization only when needed, maintaining operational efficiency through regular monitoring while reducing energy consumption by keeping the control system dormant during normal operating conditions.
Solution Approach 2:
The system uses the existing fluid flow in the hydraulic fracturing operation to perform pressure equalization without requiring separate powered pumps or actuators. The natural pressure differentials and fluid flow during fracturing operations are harnessed to equalize pressures, improving operational efficiency while minimizing additional energy consumption.
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 manages pressure differentials and lubricates valves, reducing the risk of damage and improving the efficiency of hydraulic fracturing operations by ensuring valves are properly aligned and maintained, thus enhancing overall operational reliability and safety.
Implementation Method 1
A first pressure sensor of the plurality of pressure sensors may be in fluid communication with the inlet side of the lower zipper valve and may detect a pressure of a fluid at the inlet side of the lower zipper valve
Implementation Method 2
The zipper modules may be interconnected with one another via a hydraulic fracturing system
Implementation Method 3
A system comprising a manifold assembly, zipper modules, fracturing lines, and a grease delivery and metering system, controlled by a controller with integrated pressure sensors and actuators, ensures precise pressure equalization and lubrication of valves
Data Source
AI summary
Methods and apparatus according to which a first valve is opened, or kept open, the first valve being part of a wellhead including a flow component above the first valve. The method may further include detecting a state of the first valve and, in response to detecting the state of the first valve, metering an amount of grease to the first valve. In addition, or instead, the method may further include opening, or keeping open, a second valve, the second valve being operably coupled to the wellhead and positioned above the flow component, and, after opening, or keeping open, each of the first and second valves, detecting whether the second valve is open or closed, in response to detecting that the second valve is open, preventing the first valve from being closed, and in response to detecting that the second valve is closed, allowing the first valve to be closed.