Bidirectional Valve Assembly for Continuous Drilling Fluid Circulation
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Solution Overview
Problem
Conventional drilling systems face safety and operational challenges during rod exchange, as stopping mud flow can cause borehole pressure surges and debris jamming, leading to potential accidents and reduced drilling efficiency.
Innovation Solution
A bidirectional valve assembly with a hydraulic clamping system that allows continuous mud circulation by automatically opening and closing mud flow paths, using a combination of axial and radial clapet valves and a sliding valve, which operates based on pressure differences and gravity, preventing the need to stop mud flow during rod exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the mud injection pumps are switched off during rod exchange, then the drilling rod string can be withdrawn and replaced, but a borehole pressure surge occurs and debris deposits on the borehole bottom causing jamming
Solution Approach 1:
The patent maintains continuous mud circulation through the borehole during rod exchange operations by keeping the mud injection pumps running. The valve assembly enables this continuity by providing alternative flow paths that bypass the rod string, allowing mud to flow through the annulus between the rod and borehole wall, thus preventing pressure surges and debris deposition while rod exchange is performed
2Ease of operation
If the mud flow is stopped during rod exchange, then the rod string can be removed, but debris deposits on the borehole bottom and jams the drilling rod battery
Solution Approach 1:
The valve assembly maintains continuous mud flow through the borehole during rod exchange by redirecting the flow through the annulus space between the rod and borehole wall. This continuous circulation prevents debris from settling on the borehole bottom and jamming the drilling rod battery, thereby maintaining drilling operation productivity without interruption
3Reliability
If a bidirectional valve assembly is installed between drilling rods, then mud circulation can be maintained during rod exchange, but the device complexity increases
Solution Approach 1:
The bidirectional valve assembly is nested within the existing rod string structure, with the valve body housed inside a rod segment and the flow control mechanisms integrated into the rod's internal passages. This nesting approach minimizes the additional external complexity while maintaining the functionality of continuous mud circulation during rod exchange operations
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
Ensures enhanced safety and operational efficiency by maintaining mud circulation during rod changes, preventing borehole pressure surges and debris jamming, and allowing quick resumption of drilling operations with efficient fluid feeding.
Implementation Method 1
remains at an open position under a gravity effect due to its weight
Implementation Method 2
under the drilling fluid or mud centrifugal and hydrodynamic force
Implementation Method 3
the sliding movement occurring under a pressure difference between two chambers
Data Source
AI summary
A valve assembly for drilling systems comprising a bidirectional valve (1) cooperating with a hydraulic clamping device (2) and being applied to a drilling machine for supplying a drilling fluid in two discrete directions, the valve assembly comprising a valve outer body adapted to be arranged between drilling rods while allowing said rod to be exchanged while keeping the mud continuously circulating.