Two-Tier Downhole Valve Control for Drilling Steering

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Solution Overview

Problem

Existing drilling technologies face challenges in efficiently steering downhole tools due to the high axial forces and torques required by conventional rotary valves to manage high-pressure and high-flow-rate drilling fluids, limiting the ability to selectively control fluid flow for precise directional control.

Innovation Solution

A two-tiered valve system comprising a control valve and main valves, where the control valve handles a smaller control flow to actuate main valves, allowing selective and independent control of drilling fluid flow through multiple jets, while the main valves handle high pressures and flow rates, reducing the mechanical input required for steering and directional control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional rotary valves are used to manage high-pressure and high-flow-rate drilling fluids, then the valve can handle the full flow, but high axial forces and torques are required, limiting selective control capability

Engineering Contradiction:

Improveflow control capabilityVSAvoidaxial forces and torques

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The valve system is segmented into a control valve and multiple main valves. The control valve handles a small control flow to actuate the main valves, while each main valve independently controls flow to specific jets. This segmentation allows selective control of drilling fluid flow to different jets without requiring the control valve to handle high axial forces and torques of the full flow.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If conventional rotary valves are used to steer downhole tools, then directional control is achieved, but the mechanical input required is excessively high, reducing steering precision

Engineering Contradiction:

Improvesteering controlVSAvoidmechanical input

Core Design Contradiction:

Ease of operationVSForce

Solution Approach 1:

The control valve acts as an intermediary that uses a small control flow to actuate the main valves, which in turn control the high-pressure drilling fluid flow to the jets. This intermediary mechanism reduces the mechanical input required for steering while maintaining precise directional control capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If a single valve handles all drilling fluid flow, then the system is simpler, but selective control of multiple jets is not achieved, reducing steering accuracy

Engineering Contradiction:

Improvevalve system structureVSAvoiddirectional control accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The valve system is divided into a control valve and multiple main valves, each main valve being independently controllable. This segmentation enables selective control of drilling fluid flow to different jets, achieving precise directional control for steering the downhole tool while maintaining manageable system complexity.

Inventive Principle:

Principle #1Segmentation

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 system enables precise steering of downhole tools by leveraging differential fluid dynamics, reducing the mechanical input needed for actuation, and facilitating efficient directional control with smaller, more manageable forces and torques, enhancing the accuracy and efficiency of drilling operations.

Implementation Method 1

A valve system is described herein for controlling and directing the flow of drilling fluid in a downhole tool

Methodology Applied

Scientific EffectFluid flow control:

Implementation Method 2

The drilling fluid may accordingly be made to selectively and alternatingly flow from the various jets of the downhole tool

Methodology Applied

Scientific EffectFluid flow direction:

Implementation Method 3

The selective flow of the drilling fluid may cause the downhole tool to steer in a certain direction

Methodology Applied

Scientific EffectDifferential fluid dynamics:

Data Source

PatentUS12454865B1Valve system for selective control of drilling fluid flow

Publication Date: 2025.10.28 SCHLUMBERGER TECH CORP

AI summary

A downhole tool for forming a wellbore includes a plurality of jets configured to flow a main flow of a flow of drilling fluid out of the downhole tool along a main flow path. The downhole tool includes a plurality of main valves in fluid communication with the plurality of jets along the main flow path and being actuatable to control the main flow through the plurality of jets. The downhole tool further includes a control valve in fluid communication with the plurality of main valves along a control flow path and configured to direct the control flow selectively to the plurality of main valves to selectively actuate the plurality of main valves based on a selective mechanical input to the control valve. The downhole tool further includes a mechanical input mechanism for providing the selective mechanical input to the control valve.