Swivel Anchor Slip Joint Dynamics for Jamming Resolution
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Solution Overview
Problem
Existing swivel anchors in drill strings face challenges in efficiently transmitting rotational motion and managing jamming issues during casing cutting operations, leading to potential wellbore abandonment and increased operational costs.
Innovation Solution
A swivel anchor design featuring a slip arrangement with inclined slip elements, a rotatable slip joint, and a fixing arrangement that allows for relative longitudinal motion, enabling effective engagement and disengagement with the casing and resolving jamming by adjusting the slip joint's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the slip arrangement is made rotatable about the longitudinal axis with respect to the upper and lower connections, then the reliability of rotational motion transmission is improved, but the device complexity increases due to the addition of the slip joint mechanism
Solution Approach 1:
The slip joint is designed to dynamically transition between locked and unlocked states. During normal operation, the slip joint is locked to transmit rotational motion reliably. When jamming occurs, the slip joint can be unlocked to allow relative longitudinal motion between upper and lower components, enabling the slip elements to disengage from the casing and resolve the jamming condition.
2Ease of operation
If the slip elements are constrained to move along an axis inclined with respect to the longitudinal axis, then the ease of operation for engagement and disengagement is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The slip elements are designed with inclined movement axes that create a wedging action during engagement. This inclination allows the slip elements to automatically align and engage with the casing interior surfaces more easily, while the curved or tapered geometry of the slip elements accommodates the inclined motion path within manufacturing tolerances.
3Productivity
If the upper and lower components of the slip joint are designed to move relative to each other in the longitudinal direction, then the productivity for resolving jamming issues is improved, but the loss of time for position adjustment increases
Solution Approach 1:
The slip joint incorporates a self-adjusting mechanism where the upper and lower components automatically move relative to each other in response to jamming conditions. The design allows the components to shift longitudinally to accommodate the disengagement of slip elements from the casing, enabling quick resolution of jamming issues without requiring extensive manual intervention or complex control systems.
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 design ensures reliable engagement and disengagement of the swivel anchor with the casing, facilitating efficient cutting operations and quick resolution of jamming issues, thereby reducing operational complexities and costs.
Implementation Method 1
A swivel anchor includes slips or similar elements which dig into and engage with the interior of the casing, thus holding the swivel anchor in place at a desired depth within the wellbore
Implementation Method 2
the or each slip element is constrained to move, with respect to the slip body, along an axis which is inclined with respect to the longitudinal axis
Data Source
AI summary
A swivel anchor of a drill string comprises a slip arrangement, comprising a slip body and at least one slip element; upper and lower connections attachable to further components, wherein the slip arrangement is rotatable about a longitudinal axis with respect to the upper and lower connections and a slip joint, comprising upper and lower components, wherein the upper and lower components may move relative to each other parallel with a longitudinal axis, between an open and closed positions, wherein in the open position a longitudinal displacement between the upper and lower components is greater than when the slip joint is in the closed position, and wherein when the slip joint is in the closed position, the swivel anchor length is less than when in the open position.