Bypass Sleeve Isolating Wellhead From Fracing Pressure
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Solution Overview
Problem
Well fracing operations often exceed the pressure rating of well components, leading to the need for protection from high fluid pressures that can damage equipment during hydraulic fracturing processes.
Innovation Solution
A bypass sleeve system is introduced that includes a tubular body with seal assemblies and a lock ring mechanism to isolate wellhead components from excessive pressures, allowing for the installation and removal of the bypass sleeve in a single trip, thereby protecting the wellhead from pressures exceeding 5,000 psi during fracing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bypass sleeve is installed to protect wellhead components from high pressures during fracing, then the reliability of wellhead components is improved, but the device complexity increases
Solution Approach 1:
The bypass sleeve system divides the wellhead assembly into isolated pressure zones using seal assemblies positioned at different locations (upper seal, lower seal, intermediate seal). This segmentation allows the bypass sleeve to protect specific components from high fracing pressures while maintaining operational access to other areas.
Solution Approach 2:
The bypass sleeve acts as an intermediary protective barrier between the high-pressure fracing environment and the wellhead components. It provides a pressure isolation boundary that protects vulnerable components while allowing the fracing operation to proceed at full pressure.
2Reliability
If a bypass sleeve with multiple seal assemblies is used to ensure pressure isolation, then the pressure isolation effectiveness is improved, but the ease of operation deteriorates
Solution Approach 1:
The bypass sleeve is pre-configured with all necessary seal assemblies (upper seal, lower seal, intermediate seal) and locking mechanisms before installation. The lock ring mechanism is pre-positioned to engage with the bypass sleeve body, allowing for streamlined installation and removal operations without requiring complex assembly procedures on-site.
Solution Approach 2:
The lock ring mechanism provides dynamic locking and unlocking capability, allowing the bypass sleeve to be securely installed and easily removed as needed. The mechanism transitions between locked and unlocked states to facilitate operational flexibility while maintaining pressure isolation integrity.
3Productivity
If the bypass sleeve maintains a full-bore path for fluid flow, then the productivity of fluid flow is improved, but the object-affected harmful factors worsen
Solution Approach 1:
The bypass sleeve creates a dimensional separation between the high-pressure fracing zone and the protected wellhead zone while maintaining a full-bore flow path. The tubular structure with its hollow interior provides a three-dimensional pressure barrier that isolates components without restricting fluid flow capacity.
Solution Approach 2:
The bypass sleeve is nested within the wellhead assembly, with the tubular body positioned inside the wellhead structure. This nesting arrangement allows the bypass sleeve to provide pressure protection while maintaining the full-bore flow path, as the fluid can flow through the hollow interior of the bypass sleeve without obstruction.
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 bypass sleeve effectively protects wellhead components from high pressures during fracing, facilitating efficient and safe operations by maintaining a full-bore path for fluid flow and enabling rapid installation and removal, thus enhancing the well's production capacity and reducing the risk of equipment damage.
Implementation Method 1
a first seal assembly and a second seal assembly spaced apart from one another along the central axis and configured to prevent fluid pressure from passing through the bypass sleeve
Implementation Method 2
a lock ring mechanism including a lock ring positioned within the bypass sleeve and configured to engage the wellhead assembly to restrain the bypass sleeve axially and radially
Data Source
AI summary
A wellhead system is provided. In one embodiment, the wellhead system includes a bypass sleeve for temporarily isolating portions of a wellhead assembly from pressurized fracing fluid. The bypass sleeve may include a generally tubular body having a tool interface, a lock ring disposed at least partially around the body, and an anti-rotation device coupled to the body. In some embodiments, the anti-rotation device includes a resilient member disposed in a cavity in the body, and an anti-rotation member biased away from the body by the resilient member. The anti-rotation member of some embodiments extends radially outward from the body.