Steering System Valve Body Dynamics and Sealing

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Solution Overview

Problem

Current rotary steerable drilling systems face challenges in maintaining consistent sealing performance and durability while minimizing damage to valve bodies and flow manifolds during directional drilling, due to static engagement mechanisms and high friction between moving parts.

Innovation Solution

The system allows the valve body to move relative to the motor shaft, enabling axial and pivotal movement, which improves sealing by using a polycrystalline diamond compact sealing surface and a brazed valve seat, reducing friction and wear, and incorporating a valve drive mechanism with a splined interface for torque transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a static engagement mechanism is used between the valve body and motor shaft, then the structure is simpler, but sealing performance deteriorates and damage occurs during directional drilling

Engineering Contradiction:

Improvesealing performanceVSAvoidengagement mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent transforms the static engagement mechanism into a dynamic one by allowing the valve body to move axially and pivot relative to the motor shaft. This dynamic capability enables the valve body to maintain contact with the flow manifold during directional changes, ensuring consistent sealing performance without requiring a overly complex fixed mechanism.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The engagement mechanism is divided into separate functional components: the motor shaft, the valve body, and the flow manifold. This segmentation allows each component to be optimized independently - the motor shaft provides rotational drive, the valve body provides sealing surfaces, and the flow manifold distributes fluid - while maintaining overall system reliability.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If high friction materials are used between moving parts, then manufacturing is easier, but wear and damage increase during operation

Engineering Contradiction:

Improvevalve body constructionVSAvoidservice life

Core Design Contradiction:

Ease of manufactureVSDuration of action of moving object

Solution Approach 1:

The patent employs composite material construction for the valve body, combining materials with complementary properties. The valve body incorporates low-friction, wear-resistant materials in contact surfaces while maintaining structural integrity elsewhere, thereby extending service life without compromising manufacturability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies surface parameters of the valve body and flow manifold contact surfaces, such as surface roughness and hardness, to reduce friction and wear. These parameter changes are achieved through surface treatments or material selection, allowing the components to withstand directional drilling operations for extended periods.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the valve body is fixed relative to the motor shaft, then alignment is easier, but sealing performance deteriorates during directional changes

Engineering Contradiction:

Improvesealing consistencyVSAvoidvalve body movement mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The valve body is designed to move dynamically relative to the motor shaft through axial translation and pivotal rotation. This movement is driven by the interaction between the valve body and flow manifold, allowing the valve body to maintain proper alignment and sealing contact during directional changes without requiring complex external actuation mechanisms.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The valve body's movement and alignment are self-regulating, driven by the fluid pressure and mechanical interaction with the flow manifold. The system automatically adjusts the valve body position to maintain sealing contact during directional drilling operations without requiring external control systems or complex actuation mechanisms.

Inventive Principle:

Principle #25Self-service

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 design enhances sealing performance, reduces wear and damage, and improves the durability of the steering system by allowing relative movement of the valve body, thus maintaining effective operation during directional changes and maintaining alignment with the flow manifold.

Implementation Method 1

a valve drive mechanism with a splined interface for torque transfer

Methodology Applied

Scientific EffectTorque transfer: Torque

Implementation Method 2

reducing friction and wear, and incorporating a valve drive mechanism with a splined interface for torque transfer

Methodology Applied

Scientific EffectFriction reduction: Friction

Data Source

PatentUS11773685B2Steering system for use with a drill string

Publication Date: 2023.10.03 HALLIBURTON ENERGY SERVICES INC

AI summary

A drill string steering system includes a motor and a rotary valve body disposed in a tool body. The motor includes a motor shaft coupled to the motor and extending within a central bore of the tool body. The motor shaft has a downhole engagement portion that includes a first splined surface. The rotary valve body includes a disk-shaped component and a valve shaft coupled to the disk-shaped component and extending uphole of the disk-shaped component. The valve shaft includes a second splined surface engageable with the first splined surface for rotation of the motor shaft to be imparted to the rotary valve body.