Hydraulic Wellhead Cap Lifting Apparatus with Rotating Arm
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for lifting and lowering caps on wellheads, such as night caps and lift caps, lack efficient and versatile solutions for rotating and positioning these caps, which is essential for protecting the well and facilitating drill tool operations.
Innovation Solution
A cap lifting apparatus utilizing a hydraulic pump and cylinder, combined with a frame assembly including a base member, vertical support member, and horizontal support member, allows for the raising and lowering of caps while enabling rotation to position the cap above or away from the wellhead, ensuring secure attachment and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual methods are used for lifting and lowering caps on wellheads, then the device complexity is reduced, but the productivity and operational efficiency deteriorate
Solution Approach 1:
The patent employs a hydraulic cylinder connected to the cap sub to automate the lifting and lowering of caps. The hydraulic system provides controlled mechanical force to raise the cap from the wellhead and lower it back into position, significantly improving operational efficiency while managing device complexity through standardized hydraulic components
Solution Approach 2:
The apparatus is divided into distinct functional modules: a frame assembly for structural support, a hydraulic cylinder for actuation, a cap sub for engagement, and a locking mechanism for positioning. This segmentation allows each component to be optimized independently and facilitates ease of maintenance and operation
2Adaptability or versatility
If fixed positioning methods are used for caps, then the device complexity is reduced, but the adaptability deteriorates
Solution Approach 1:
The patent incorporates a rotatable arm assembly that can dynamically adjust the position of the cap sub relative to the wellhead. The arm rotates to accommodate different cap positions and orientations, providing adaptability for various operational requirements while using simple rotational joints to manage complexity
Solution Approach 2:
The apparatus is designed to handle multiple cap types and positions through its universal rotating arm mechanism. The same basic structure can lift, lower, and position caps in various orientations, making the system versatile for different wellhead configurations and drill tool operations without requiring multiple specialized devices
3Productivity
If rapid cap operations are performed, then the productivity is improved, but the reliability deteriorates
Solution Approach 1:
The locking mechanism is designed to engage and secure the cap sub to the wellhead before rapid operations begin. The preliminary locking action ensures that the cap is firmly attached prior to any high-speed lifting or lowering, preventing accidental detachment while maintaining operational speed through pre-positioned locking components
Solution Approach 2:
The hydraulic cylinder provides controlled, cushioned movement during cap attachment and detachment operations. The hydraulic system's inherent fluid compression allows for smooth deceleration and controlled stopping, preventing impact-related failures while maintaining overall operational speed through efficient hydraulic actuation
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 apparatus efficiently raises and lowers caps, ensuring wellhead protection and facilitating drill tool operations by providing a secure and versatile mechanism for cap management, enhancing operational safety and efficiency.
Implementation Method 1
actuation of the hydraulic piston causes the cap to raise or lower about the cap sub
Implementation Method 2
The lifting apparatus may be rotated so that the load is positioned above the wellhead before lowering
Data Source
AI summary
A hydraulic lifting apparatus and a method is described that raises and lowers caps, such as night caps, lift caps, and other similar items, about a cap sub engaged to a wellhead. The apparatus includes a cap sub, vertical support member, a horizontal support member, a base member, and a hydraulic cylinder. The lifting device is attached to a wellhead assembly through a cap sub. The base member is attached to the cap sub through an enlarged ring. The base member also includes an elongated projected portion. The vertical support member is rotatably retained within a bore in the elongated projected portion. The proximal end of horizontal support member is connected to the upper end of the vertical support member. The hydraulic cylinder, which includes a hydraulic head and a hydraulic piston, is connected to the distal end of the horizontal support member. The vertical support member is capable of being rotated about the base member. The hydraulic cylinder is actuated to raise or lower a cap onto a cap sub, which is removably attached to a wellhead assembly. The vertical support member may be locked into place in a cap-engagement position or a non-cap engagement position through use of a spring-loaded locking pin which is inserted into a locking bracket on the vertical support member and into a recess on the base member.