Wellhead Valve Equalization Control for Fracturing Pressure Differentials
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Solution Overview
Problem
Existing fluid systems in oil and gas operations face challenges in efficiently managing pressure differentials and fluid flow control, leading to potential damage and inaccurate readings in wellhead components, which can impact the reliability and efficiency of hydraulic fracturing operations.
Innovation Solution
A system with intelligent pressure control and fluid management, utilizing a controller to regulate valves and equalization valves, pressure sensors, and actuators to ensure balanced pressure differentials and safe fluid flow, incorporating materials like Stellite and engineered ceramics for durability, and a grease system for lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional valve systems are used in hydraulic fracturing operations, then the system structure is simple, but the valves are susceptible to pressure differential damage and provide inaccurate readings
Solution Approach 1:
The valve system is divided into multiple containment areas (first containment area with process fluid, second containment area with equalization fluid) separated by a valve member. This segmentation allows independent pressure management in each area, protecting the valve from damaging pressure differentials while maintaining operational control.
Solution Approach 2:
An equalization valve and equalization fluid system are introduced as intermediary components between the process fluid and the valve. These components equalize pressures across the valve member, preventing direct exposure to damaging pressure differentials while allowing the valve to function properly.
2Productivity
If valves are exposed to high pressure differentials during hydraulic fracturing, then fluid flow control capability is improved, but the valves suffer from pressure damage and reduced lifespan
Solution Approach 1:
The equalization fluid system is pre-configured to equalize pressures before the valve member is actuated. This beforehand cushioning prevents sudden pressure shocks and damaging pressure differentials from reaching the valve, extending its operational lifespan while maintaining full fluid flow control capability.
3Measurement precision
If pressure sensors are placed directly in high-pressure fluid streams, then accurate pressure monitoring is achieved, but the sensors are damaged by pressure and fluid exposure
Solution Approach 1:
Pressure sensors are placed in the equalization fluid rather than directly in the high-pressure process fluid. The equalization fluid acts as an intermediary, transmitting pressure information to the sensors without exposing them to damaging pressure levels and harsh fluid conditions, while still enabling accurate pressure monitoring.
4Strength
If valve components are made from durable materials like Stellite and engineered ceramics, then resistance to pressure and wear is improved, but manufacturing complexity and cost increase
Solution Approach 1:
Durable materials such as Stellite and engineered ceramics are applied selectively to specific high-wear and high-stress components (valve member, seat, trim) rather than the entire valve assembly. This local quality approach provides enhanced durability where needed while keeping manufacturing complexity and cost manageable for the overall system.
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 the reliability and efficiency of hydraulic fracturing operations by preventing valve damage, ensuring accurate pressure readings, and optimizing fluid flow, thereby improving the overall performance and safety of oil and gas exploration and production processes.
Implementation Method 1
an equalization valve in fluid communication with the inlet side and the outlet side of the valve member. The equalization valve is controllable from the remote location and, when opened, equalizes fluid pressure between the inlet side and the outlet side
Implementation Method 2
the valve and the equalization valve are remotely actuable by a controller. In one embodiment, the controller is operably coupled to the valve and the equalization valve
Implementation Method 3
a first pressure sensor in fluid communication with the inlet side of the valve member and a second pressure sensor in fluid communication with the outlet side of the valve member
Implementation Method 4
a valve body and a valve member extending within the valve body and actuable between an open configuration and a closed configuration
Implementation Method 5
incorporating materials like Stellite and engineered ceramics for durability, and a grease system for lubrication
Data Source
AI summary
Oil and gas operations according to which a wellhead is operably associated with a wellbore, a valve is operably coupled to the wellhead, opposite the wellbore, a frac line is operably coupled to the wellhead, and a zipper module is operably coupled to the frac line, opposite the wellhead.