Tubular Connection Refacing Apparatus with Precision Drive
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Solution Overview
Problem
Existing methods for refacing high torque tubular connections in the field are either costly, inconvenient, or lack precision, often resulting in crooked or damaged seals due to uneven pressure application and the complexity of existing tools.
Innovation Solution
A portable refacing apparatus with a mandrel and drive system that includes independent rotatable faceplates and an engaging nut for precise longitudinal movement of cutters, along with an oil-air system for lubrication and debris removal, allowing for simultaneous cutting of multiple faces and improved alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If portable refacing apparatus is used in the field, then transportation costs and inconvenience are reduced, but precision and alignment accuracy may deteriorate
Solution Approach 1:
The refacing apparatus is divided into separate functional components: a mandrel assembly for positioning, a drive system for rotation, and cutter assemblies for material removal. This segmentation allows each component to be optimized independently while maintaining overall precision through their coordinated assembly in the field.
Solution Approach 2:
The patent replaces complex mechanical alignment systems with a simplified positioning mechanism where the mandrel is inserted into the tubular connection and automatically centers itself. The drive system uses a motorized spindle that rotates the cutters precisely without requiring complex mechanical guidance, thereby maintaining accuracy while improving portability.
2Device complexity
If simple refacing tools are used, then device complexity is reduced, but reliability and seal quality deteriorate
Solution Approach 1:
The cutter assemblies are designed to be dynamically adjustable relative to the rotating mandrel. The cutters can be positioned at different radial distances and angular orientations, allowing precise control over the refacing operation. This dynamic positioning capability ensures high seal face quality while keeping the overall tool structure relatively simple through modular design.
Solution Approach 2:
The apparatus allows changing of critical parameters such as cutter speed, feed rate, and cutter position during the refacing operation. By controlling these parameters precisely, the system maintains high reliability and seal face quality without requiring an overly complex mechanical structure.
3Ease of operation
If manual pressure application is used, then ease of operation is improved, but manufacturing precision deteriorates due to uneven pressure
Solution Approach 1:
The patent replaces manual pressure application with a motorized drive system that rotates the cutters at controlled speeds against the seal faces. The cutting force is automatically regulated through the motor control, ensuring uniform material removal and precise face perpendicularity without requiring the operator to manually control pressure.
Solution Approach 2:
The system incorporates feedback mechanisms where the drive system monitors and adjusts the cutting parameters in real-time based on the resistance encountered. This automatic feedback control ensures consistent cutting pressure and maintains high manufacturing precision while keeping the operation simple for the user.
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
Enables precise and efficient refacing of tubular connections in the field with improved safety and accuracy, reducing the need for costly transportation and equipment, while maintaining alignment and surface quality.
Implementation Method 1
a lubricant-air system providing lubricant-laden air to the cutters
Implementation Method 2
providing lubricant-laden air to the cutters
Data Source
AI summary
An apparatus and method of using an apparatus for refacing a tubular connection is provided. In one example, the apparatus has a mandrel connectable to a threaded portion of a tubular connection and two face plates bearing cutters for refacing surfaces of the tubular connection. In this example, the cutting is controlled by an engaging nut moving along a threaded portion of a drive shaft, and the two face plates may be spaced apart at a fixed distance to maintain the distance between the torque-stop surface and the primary surface after refacing. Also, the apparatus uses a locking pin to assist in tightening or loosening the mandrel into place using the remainder of the apparatus. An air-oil system is provided to supply air and oil to the cutting surfaces as the apparatus refaces the shoulders of the connection. An exemplary pin refacer and an exemplary box refacer are both disclosed.