Axially Shiftable Pin for Whipstock Window Mill Connection
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Solution Overview
Problem
The existing systems for joining a window mill to a whipstock in the drilling and completion industry often result in premature shear bolt fracture, leading to improper placement and a time-consuming replacement process, necessitating a more efficient connection method.
Innovation Solution
A window cutting system featuring a whipstock with a recess and passage, and a window mill connected via a pin that is axially shiftable within a pressure compartment, allowing for secure connection and easy disconnection through hydraulic pressure and torsional force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a shear bolt is used to connect the window mill to the whipstock, then the connection can be made securely, but the shear bolt may fracture prematurely resulting in improper placement
Solution Approach 1:
The pin is designed to be axially shiftable relative to the window mill and whipstock when exposed to pressure in the pressure compartment. This dynamic capability allows the pin to move axially under hydraulic pressure, enabling controlled disconnection or repositioning while maintaining secure connection during normal operation, thus preventing premature fracture while preserving connection strength
Solution Approach 2:
The system changes the operational state of the pin by applying pressure through the pressure compartment and axial passage. This parameter change (from static to movable state under pressure) allows the pin to shift axially, providing a mechanism to prevent premature failure while maintaining reliable connection under normal conditions
2Reliability
If the whipstock needs to be re-oriented or the shear bolt replaced after premature fracture, then proper placement can be achieved, but the process becomes difficult and time-consuming
Solution Approach 1:
The axially shiftable pin design allows for quick disconnection and reconnection of the window mill to the whipstock. Instead of replacing the entire shear bolt and re-orienting the whipstock, the pin can be shifted axially under pressure to facilitate easy disassembly and reassembly, dramatically reducing the time and difficulty of corrections
Solution Approach 2:
The system enables self-service correction capabilities through the pressurizable pin mechanism. The hydraulic pressure system can be used to shift the pin axially, allowing operators to disconnect and reposition components without extensive manual intervention or specialized tools, thereby reducing corrective maintenance time
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
This solution enables efficient and reliable connection and disconnection of the window mill from the whipstock, reducing the risk of premature fracture and streamlining the process, thereby increasing operational efficiency in forming windows in casing tubulars.
Implementation Method 1
the pin being axially shiftable relative to the window mill and the whipstock when exposed to pressure in the pressure compartment
Data Source
AI summary
A window cutting system includes a whipstock having an outer surface, an inner surface, a recess, and a passage extending through the outer surface and the inner surface in the recess. A window mill is connected to the whipstock. The window mill includes a body having a tip portion, a pressure compartment formed in the tip portion, and an axial passage extending though the tip portion from the pressure compartment. A pin connects the window mill and the whipstock. The pin is arranged in the pressure compartment and extends through the axial passage and the passage into the recess. The pin is axially shiftable relative to the window mill and the whipstock when exposed to pressure in the pressure compartment.