Iron Roughneck Circulation Coupler for Constant Mud Flow
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Solution Overview
Problem
Current wellbore drilling systems face challenges in maintaining constant mud circulation during drill pipe loading and tripping, leading to potential kick phenomena, hydraulic fracturing, and loss of drilling mud, which can result in environmental and economic damage.
Innovation Solution
A constant circulation system is introduced, featuring an iron roughneck with an integrated circulation coupler that maintains mud circulation by shifting the mud supply between the top drive and the circulation coupler, utilizing a combination of axial and radial valves to ensure continuous flow and pressure control, even when pumps are shut down.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pumps are shut down during drill pipe loading and tripping, then drill pipe operations can be performed, but mud circulation stops leading to kick phenomena, hydraulic fracturing, and loss of drilling mud
Solution Approach 1:
The system segments the mud circulation path into two independent routes: the primary route through the drill string and the secondary route through the circulation coupler and annulus. This segmentation allows mud circulation to continue through the annulus when the drill string is being loaded or tripped, preventing the harmful effects of stopped circulation while enabling drill pipe operations.
Solution Approach 2:
The circulation coupler acts as an intermediary device that provides an alternative circulation path. When the primary circulation route is interrupted during drill pipe operations, the circulation coupler mediates by allowing mud to flow through the annulus, maintaining circulation continuity and preventing kick phenomena and hydraulic fracturing.
2Reliability
If mud circulation continues during drill pipe operations, then kick phenomena and hydraulic fracturing are prevented, but system complexity increases with additional valves and circulation paths
Solution Approach 1:
The system employs dynamic valve control where the axial and radial valves automatically adjust their positions based on operational requirements. During normal drilling, the axial valve directs mud through the drill string. During drill pipe loading or tripping, the valves dynamically switch to route mud through the circulation coupler and annulus, providing flexible circulation control without permanent complex routing.
Solution Approach 2:
The circulation coupler is designed with multi-functionality, serving as both a circulation device and a structural component of the drill string. The axial and radial valves within the coupler provide multiple flow paths that can be activated based on operational needs, allowing a single device to handle both normal drilling circulation and alternative circulation during pipe operations.
3Reliability
If axial and radial valves are used to control mud flow, then continuous circulation and pressure control are achieved, but device complexity and potential failure points increase
Solution Approach 1:
The axial and radial valves are designed to operate automatically based on pressure differentials and flow conditions without requiring external control systems. The valves self-regulate mud flow distribution between the drill string and circulation coupler paths, reducing the need for complex external control mechanisms and minimizing potential failure points while maintaining reliable pressure control.
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 system ensures continuous mud circulation and pressure control, preventing kick phenomena and hydraulic fracturing, thereby enhancing drilling safety and efficiency by maintaining consistent flow and pressure during drill pipe operations.
Implementation Method 1
utilizing a combination of axial and radial valves to ensure continuous flow and pressure control
Implementation Method 2
a hydrostatic column of drilling mud typically extends from the bottom of the hole up to a bell nipple of a diverter assembly on the drilling rig
Data Source
AI summary
An iron roughneck for constant circulation of drilling mud during operation of a drill string, the iron roughneck comprising: a frame; a wrench unit supported by the frame, wherein the wrench unit is capable of gripping a drill string; a spinner unit supported by the frame, wherein the spinner unit is capable of engaging and spinning a drill pipe; and a circulation coupler supported by the frame, wherein the circulation coupler forms a chamber around the drill string.