Inline Bistable Valve Layout for Agile Directional Drilling
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Solution Overview
Problem
Directional drilling systems face challenges in maneuverability and agility due to geometrical constraints, particularly when drilling tools with smaller diameters are required for accessing resources laterally spaced from the drilling and production facilities, necessitating improved valve designs and arrangements in bottom hole assemblies (BHA) to enable precise arc trajectories.
Innovation Solution
The implementation of bistable valves with pressure-compensated seals and single-sided valve arrangements in the BHA, allowing for compact and stable positioning, along with geometric configurations such as triangular and in-line arrangements, to enhance the agility and maneuverability of the drilling tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional valve designs are used in bottom hole assemblies, then the drilling tool can maintain structural simplicity, but the drilling tool suffers from reduced maneuverability and agility when drilling arc trajectories
Solution Approach 1:
The valve assembly is segmented into multiple independent bistable valves, each controlling a specific fluid actuator. This segmentation allows each valve to be optimized for its specific function while maintaining overall system maneuverability, resolving the contradiction between ease of operation and device complexity
Solution Approach 2:
The patent transitions from traditional lateral valve arrangements to an axial/in-line arrangement along the drill string axis. This dimensional change enables compact packaging of multiple valves within the limited radial space of the BHA, improving maneuverability without proportionally increasing overall device complexity
2Adaptability or versatility
If smaller diameter drilling tools are used to access laterally spaced resources, then the drilling system can improve access capability, but the valve designs must become more compact which increases design complexity
Solution Approach 1:
The valve components are nested within each other along the axial direction, with valves arranged in series along the drill string axis. This nesting approach maximizes the use of available space within the smaller diameter BHA, enabling access capability improvements without exponentially increasing design complexity
Solution Approach 2:
Multiple valve functions are merged into a compact axial arrangement where valves share common mounting structures and fluid pathways. This merging reduces the overall complexity that would otherwise result from having separate, distributed valve assemblies in a constrained space
3Use of energy by moving object
If traditional valve positioning mechanisms are used, then the valve structure can remain simple, but energy efficiency and positioning stability are reduced
Solution Approach 1:
The valve system employs bistable actuators that utilize magnetic fields and spring forces to achieve stable positioned states. This dynamic approach allows the valve to maintain positions without continuous energy input, improving energy efficiency while the actuator complexity increases to incorporate magnetic elements and spring mechanisms
Solution Approach 2:
Traditional purely mechanical valve positioning is replaced with a hybrid system incorporating magnetic fields and elastic springs. This substitution provides passive holding forces that improve energy efficiency, though it does increase the complexity of the actuator design
4Manufacturing precision
If compact valve arrangements are implemented to improve agility, then the drilling tool achieves tighter arc trajectories, but the valve sealing requirements become more stringent increasing manufacturing difficulty
Solution Approach 1:
The valve design incorporates localized sealing features at critical interfaces, with pressure-compensated seals positioned specifically where pressure differentials are highest. This local quality approach concentrates manufacturing precision efforts on specific sealing surfaces rather than requiring high precision throughout the entire valve assembly, making manufacturing more feasible
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 bistable valves provide energy-efficient and stable positioning, enabling the drilling tool to achieve tighter, more precise arc trajectories with improved agility and maneuverability, suitable for directional drilling systems.
Implementation Method 1
a pressure-compensated seal disposed about the stem, wherein the pressure-compensated seal is disposed between an interior fluid chamber and a fluid flow path through the at least one valve
Data Source
AI summary
A system includes a bottom hole assembly (BHA), including at least one valve including a bistable actuator coupled to a stem having a valve element, wherein the bistable actuator is configured to move the stem along an axial path of travel to position the valve element in an open position or a closed position relative to a valve seat. The at least one valve also includes a pressure-compensated seal disposed about the stem, wherein the pressure-compensated seal is disposed between an interior fluid chamber and a fluid flow path through the at least one valve.