Casing Stripper Attachment With Clamp-Based Non-Threaded Assembly

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Solution Overview

Problem

Existing casing stripper rubbers face challenges with threaded connections that complicate attachment and removal, leading to increased downtime and costs, and are not suitable for larger drilling tools due to limited bore size, while also posing environmental hazards when removed.

Innovation Solution

A non-threaded casing stripper rubber assembly with an attachment body featuring a base and lip, secured by a clamp, allowing for a larger bore size and easier attachment/removal, and compatible with both rotating and drilling nipples, reducing the need for specialized threaded rubbers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If threaded connections are used to attach casing stripper rubber to drilling nipple, then the connection can be established, but the attachment and removal process becomes complicated and time-consuming

Engineering Contradiction:

Improveconnection reliabilityVSAvoidattachment and removal time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The attachment body is divided into distinct components: a base that attaches to the drilling nipple and a lip that secures the rubber. This segmentation allows for simpler attachment mechanisms compared to threaded connections, reducing the time and complexity of both attachment and removal operations while maintaining reliable connection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using threaded connections that require winding and unwinding operations, the patent inverts the approach by using a clamp-based attachment body that can be quickly opened and closed. This inversion of the connection mechanism dramatically reduces the time required for attachment and removal while maintaining secure connection reliability.

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If specialized threaded casing stripper rubber is used, then attachment to threaded connections is possible, but the device complexity increases and multiple specialized parts are needed

Engineering Contradiction:

Improvecompatibility with threaded connectionsVSAvoidnumber of specialized parts

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The attachment body design with base and lip provides a universal interface that can accommodate different types of drilling nipples and casing stripper rubbers. This universal design eliminates the need for multiple specialized threaded parts, reducing device complexity while maintaining adaptability to various drilling equipment configurations.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent extracts the threading complexity from the casing stripper rubber assembly by using a separate attachment body that handles the connection function. This separation allows the main rubber component to remain simple while the attachment body provides the necessary interface, reducing overall device complexity and the number of specialized parts needed.

Inventive Principle:

Principle #2Taking out (Extraction)

3Device complexity

If standard bore size is used in casing stripper rubber, then the design is simpler, but larger drilling tools cannot be accommodated

Engineering Contradiction:

Improvedesign simplicityVSAvoidaccommodation of larger drilling tools

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The attachment body with its movable clamp mechanism provides dynamic adjustability that allows the bore size to be effectively varied. The clamp can be opened to accommodate larger drilling tools and closed to maintain sealing, providing adaptability without requiring multiple fixed-size components, thus maintaining design simplicity while increasing versatility.

Inventive Principle:

Principle #15Dynamics

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 enhances the efficiency of attaching and removing casing stripper rubbers, accommodates larger drilling tools, minimizes downtime and environmental impact, and reduces manufacturing costs by eliminating the need for multiple specialized parts.

Implementation Method 1

The clamp secures the base of the attachment body with the housing

Methodology Applied

Scientific EffectMechanical Fastening: Mechanical Fastener

Implementation Method 2

Pressure control is achieved by means of one or more stripper rubbers. Stripper rubbers typically taper downward and include rubber or other elastomeric substrate so that the downhole pressure pushes up on the rubber, pressing the rubber against the casing inserted into the stripper rubber to achieve a fluid-tight seal

Methodology Applied

Scientific EffectElastic Deformation: Elasticity

Data Source

PatentUS9382773B1Casing stripper attachment

Publication Date: 2016.07.05 PRUITT TOOL & SUPPLY

AI summary

The casing stripper attachment secures the casing stripper within a housing, such as the bowl. The casing stripper rubber attaches to an attachment body for installation within the housing. The attachment body includes a base and an attachment lip. The base provides an outer surface for securing the attachment body and stripper rubber to the housing. The clamp secures the outer surface of the base with the housing. The stripper rubber fastens to the attachment lip of the attachment body to be secured within the bowl. The base of the present invention could attach to a drilling nipple that assists with inserting the casing into the well, a process known as running casing.