Rotatable Valve Circulation Tool Actuation
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Solution Overview
Problem
Existing downhole circulation tools face issues with flow separation, high pressure losses, erosion, and limited actuation cycles due to the use of sliding sleeve valves and disintegratable actuation balls, which affect the efficiency of drilling mud flow and hole cleaning in oil and gas exploration.
Innovation Solution
A downhole circulation tool with a rotatable valve member having separate through-flow and circulation channels, and a unidirectional drive mechanism that uses a disintegratable actuation element composed of phyllosilicate clay and salt, allowing for controlled actuation and efficient mud flow redirection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sliding sleeve valve is used to divert drilling mud, then the circulation tool can redirect flow from the drill string to the bore hole annulus, but flow separation and high pressure losses occur
Solution Approach 1:
The circulation tool is divided into separate functional sections: a drill string flow path section and a bore hole annulus flow path section, connected by a controllable flow port. This segmentation allows independent optimization of each flow path and enables precise control over when and how mud is diverted, reducing unnecessary pressure losses while maintaining circulation capability.
Solution Approach 2:
The flow port is made dynamically controllable through a sliding sleeve valve mechanism that can open or close based on operational requirements. This dynamic control allows the system to adapt flow paths in real-time, directing mud through the drill string when circulation is needed and closing the flow port to eliminate pressure losses when circulation is not required.
2Ease of operation
If a sliding sleeve valve is used to divert drilling mud, then circulation flow can be generated, but erosion and washing of tool components occurs
Solution Approach 1:
Hard-wearing materials are selectively applied to components exposed to high-velocity drilling mud, such as the flow port, sliding sleeve valve, and adjacent structural elements. This localized reinforcement provides erosion protection exactly where the highest impact occurs, allowing the tool to generate effective circulation flow without suffering excessive wear from high-velocity mud jets.
3Ease of operation
If a sliding sleeve valve is used to divert drilling mud, then circulation can be achieved, but seals around the valve may be damaged or extruded
Solution Approach 1:
Flexible seal elements are used around the sliding sleeve valve, allowing the valve to move axially without causing seal extrusion. The flexible seals can deform to accommodate valve movement while maintaining sealing pressure, enabling reliable circulation actuation without compromising seal integrity through excessive mechanical stress.
4Device complexity
If disintegratable actuation balls are used, then ball catchers are eliminated, but premature disintegration may occur
Solution Approach 1:
The disintegratable actuation balls are formulated with specific material properties and size parameters that control their disintegration timing. The balls are designed to maintain structural integrity during transit and actuation, then disintegrate reliably once they have fulfilled their function of opening the flow port, eliminating the need for ball catchers while ensuring consistent actuation performance.
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
The solution minimizes flow separation, reduces pressure losses, and enables reliable, repeated actuation between through-flow and circulation modes, enhancing drilling efficiency and hole cleaning by maintaining a stable and efficient drilling mud flow.
Implementation Method 1
an actuation element for a downhole tool, wherein the actuation element is configured to disintegrate under pressure in the downhole tool
Implementation Method 2
the actuation element is configured to disintegrate under pressure in the downhole tool
Data Source
AI summary
A downhole circulation tool includes: a housing having an axially extending delivery bore for conveying a drilling mud flow therethrough, the housing having a circulation port for discharging drilling mud; and a valve member rotatably disposed within the housing, the valve member comprising a through-flow channel and a circulation channel. The valve member is rotatable between a through-flow position in which the through-flow channel is arranged to convey drilling mud flow from an upstream portion of the delivery bore to the downstream portion of the delivery bore, and a circulation position in which the circulation channel is arranged to convey drilling mud from the upstream portion of the delivery bore to the circulation port to discharge drilling mud from the housing. There is also disclosed a downhole tool comprising a unidirectional drive mechanism, an actuation element for a downhole tool, and a method of operating a downhole tool.