Planetary Roller Screw Telescoping for Downhole Robot Traction

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Solution Overview

Problem

Existing downhole explosion robots for underground resource extraction face challenges in meeting requirements for running speed, accuracy, and economical cost, with complex structures that necessitate significant financial resources and room for improvement in structural design.

Innovation Solution

A downhole explosion robot utilizing a planetary roller screw telescoping mechanism, comprising a rear and front main body with support and control sub-units, and a telescopic sub with a planetary roller screw mechanism for efficient traction and structural simplification, reducing the need for hydraulic valves and electronic components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If traditional hydraulic telescoping mechanisms are used, then the robot can achieve sufficient traction force, but the structural complexity increases due to multiple hydraulic valves and electronic components

Engineering Contradiction:

Improvestructural complexityVSAvoidtraction force

Core Design Contradiction:

Device complexityVSForce

Solution Approach 1:

The patent replaces the traditional hydraulic telescoping mechanism with a planetary roller screw mechanism. This mechanical substitution eliminates the need for hydraulic valves and complex electronic control components, significantly simplifying the overall structure while maintaining the ability to generate sufficient traction force through the mechanical advantage of the planetary roller screw system

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts and removes the hydraulic system components (hydraulic valves, hydraulic lines, and associated electronic controls) from the telescoping mechanism, retaining only the essential mechanical elements needed for force generation and motion transmission, thereby reducing structural complexity

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of manufacture

If complex structures with hydraulic valves and electronic components are used, then the robot can achieve precise control, but the manufacturing cost increases significantly

Engineering Contradiction:

Improvemanufacturing costVSAvoidcontrol precision

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

By replacing hydraulic and electronic control systems with a purely mechanical planetary roller screw mechanism, the patent reduces manufacturing costs associated with expensive hydraulic components and electronic sensors, while the inherent mechanical precision of the roller screw system maintains adequate control accuracy for downhole operations

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs simpler mechanical components that are less expensive to manufacture compared to hydraulic valves and electronic sensors. These mechanical parts can be more easily replaced if needed, reducing overall system cost while maintaining functional performance

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Ease of manufacture

If the robot structure is simplified, then the manufacturing cost decreases, but the stability and reliability under high temperature and pressure conditions may be compromised

Engineering Contradiction:

Improvemanufacturing costVSAvoidstability under high temperature and pressure

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent employs composite material construction for the planetary roller screw components, combining materials with high strength-to-weight ratios and excellent thermal stability. This allows the simplified mechanical structure to maintain reliability under downhole high temperature and pressure conditions while keeping manufacturing costs lower than traditional hydraulic systems

Inventive Principle:

Principle #40Composite materials

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 robot achieves simplified structural design, high traction force, stability, and long service life, with high temperature and pressure resistance, enabling efficient delivery of tools and operation in various wellbore sizes and conditions.

Implementation Method 1

planetary roller screw telescoping

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Implementation Method 2

planetary roller screw mechanism

Methodology Applied

Scientific EffectScrew mechanism: Screw

Implementation Method 3

rear support cylinder piston can slide relatively

Methodology Applied

Scientific EffectHydraulic pressure: Hydraulic Press

Data Source

PatentUS11668148B1Downhole explosion robot based on planetary roller screw telescoping and traction method thereof

Publication Date: 2023.06.06 CHENGDU UNIVERSITY OF TECHNOLOGY

AI summary

The present invention relates to the technical field of development of underground resources such as petroleum, natural gas, geothermal energy, etc., in particular to a downhole explosion robot based on planetary roller screw telescoping and traction method thereof. The present invention provides a downhole explosion robot based on planetary roller screw telescoping and traction method thereof, comprising a rear joint, a rear main body, a telescopic sub, a front main body, and a front joint, and the rear main body is provided with a rear control sub and a rear support sub; the front main body is provided with a front support sub and a front control sub, and the telescopic sub is respectively connected with the rear support sub and the front support sub. The invention has the advantages of reliability and stability, with less impact on the tube string, and can be applicable to smaller wellbore.