Downhole Location Indication Device with Slidable Collet
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Solution Overview
Problem
In subterranean well construction, accurately determining the depth or position of downhole components is challenging due to the depth of wells and offshore operational conditions, making it difficult to precisely place casing segments relative to installed casing strings.
Innovation Solution
The use of downhole location indication devices with a slidable collet and protrusions that change snap force requirements based on position, allowing for precise engagement and location determination by varying the snap force needed to depress protrusions, enabling accurate positioning of casing strings within the wellbore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If downhole location indication devices are used to determine depth or position of downhole components, then measurement precision is improved, but device complexity increases due to the need for slidable collet mechanisms with multiple protrusions and snap force variations
Solution Approach 1:
The indicating device is segmented into multiple functional components: a body, a slidable collet with multiple protrusions at different positions, and reference elements. Each protrusion corresponds to a specific depth reference point, allowing the device to provide precise depth determination through discrete, segmented measurement points rather than a continuous complex mechanism.
Solution Approach 2:
The slidable collet acts as an intermediary mechanism between the indicating device body and the depth reference elements. It translates the physical interaction with reference elements into measurable snap force variations, serving as a mediator that converts mechanical engagement into position information without requiring complex sensing systems.
2Measurement precision
If distinct snap forces are used to indicate different positions, then measurement precision is improved, but ease of operation deteriorates due to the need to distinguish between different force levels
Solution Approach 1:
The patent employs analogous 'color changes' in the mechanical domain by creating distinct, recognizable snap force characteristics for different positions. Each protrusion is designed to engage with reference elements at specific depths, producing unique snap force patterns that can be easily distinguished by operators, similar to how color changes provide immediate visual feedback in other systems.
Solution Approach 2:
The system provides immediate tactile feedback through distinct snap force variations when protrusions engage with depth reference elements. This feedback mechanism allows operators to instantly recognize the depth position being indicated without requiring complex instrumentation or interpretation, as the snap force characteristics directly communicate position information.
3Reliability
If multiple protrusions with different snap forces are implemented, then reliability is improved for depth referencing, but manufacturing precision requirements increase to ensure proper protrusion positioning
Solution Approach 1:
The protrusions are pre-positioned at specific locations on the slidable collet during manufacturing, with each protrusion's position predetermined to correspond to a specific depth reference point. This preliminary positioning allows the device to reliably indicate multiple depth references without requiring complex adjustment mechanisms during field operation, as the critical positioning is established in advance.
Solution Approach 2:
The invention varies the parameter of snap force by designing protrusions at different positions on the slidable collet, each engaging with reference elements to produce distinct force characteristics. This parameter variation approach allows the device to provide multiple reliable depth references using a single standardized component design, reducing the need for high-precision customization of each individual protrusion.
Data Source
AI summary
A downhole indicating device includes a collet body and a slidable collet comprising a protrusion and surrounding and slidable along a length of the collet body between a low snap position and a high snap position. In the low snap position, the protrusion is depressible under a low snap force, and in the high snap position, the protrusion is depressible under a high snap force with the low snap force being less than the high snap force.