Casing Puller With Deployable Arms For Directional Drilling
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Solution Overview
Problem
Directional drilling faces challenges in pulling casing pipes through enlarged bores, especially when encountering hard materials, due to the massive forces required, which can make the process difficult and expensive.
Innovation Solution
A casing puller system with a body and movable arm that can transition between stowed and deployed positions, allowing engagement with the casing pipe's arm receiver, enabling secure pulling and subsequent disengagement, is designed for efficient insertion and removal of casing pipes during directional drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional pulling methods are used to pull casing pipes through enlarged bores, then the casing pipe can be installed, but massive forces are required which makes the process difficult and expensive
Solution Approach 1:
The pulling system is segmented into multiple components: a casing puller with arms, arm receivers on the casing pipe, and connection to drill pipe. This segmentation allows the pulling force to be distributed and applied through multiple contact points rather than a single massive force, resolving the contradiction between installation efficiency and force requirements
Solution Approach 2:
The arms of the casing puller are designed to be movable between stowed and deployed positions, allowing the system to dynamically adapt during the pulling process. This dynamic configuration enables the system to maintain optimal engagement with the arm receivers while reducing the peak forces required, thereby improving productivity without requiring excessive force
2Force
If the arm is engaged with the arm receiver during pulling, then friction is reduced and force requirements decrease, but the device complexity increases due to movable arms
Solution Approach 1:
The arms are nested within the body of the casing puller when in the stowed position, and deploy outward when needed. This nesting approach allows the movable arms to be integrated into the compact body structure without significantly increasing the overall device complexity, while still providing the force reduction benefits during pulling operations
Solution Approach 2:
The arms are designed with simple pivot connections to the body, allowing them to move between stowed and deployed positions through basic rotational motion. This dynamic design achieves the force reduction benefit through engagement with arm receivers while maintaining relatively simple device complexity through straightforward mechanical motion
Data Source
AI summary
A casing puller includes a body and at least one arm. The body has first and second ends, at least one end connectable to a drill pipe. The body defines a longitudinal axis and sized for insertion into a casing pipe. The at least one arm is disposed on the body and moves between a stowed position and a deployed position. The at least one arm extends away from the longitudinal axis when in its deployed position and is arranged to engage an arm receiver defined by the casing pipe.