Downhole Tractor Hydraulic Valve Section for Force-Speed Control
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Solution Overview
Problem
Current downhole tractor technology lacks sufficient control over operational parameters such as axial force and torque during milling operations, limiting its effectiveness and flexibility in navigating complex oil well environments and reducing conveyance speed.
Innovation Solution
A hydraulic system with a valve section that divides hydraulic supply lines into parts, allowing individual control of fluid flow to subsets of hydraulic cylinders and motors, and a hydraulic bypass supply line that directs fluid directly to the valve section, enabling various operational modes and reconfiguration of the tractor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If multiple drive sections are added in parallel to provide more pulling force, then the pulling force increases, but the conveyance speed reduces due to reduced flow per motor
Solution Approach 1:
The hydraulic supply system is segmented into multiple independently controllable branches, each serving a drive section. The valve section divides the hydraulic supply line into multiple outlets, allowing selective activation of drive sections based on operational requirements, thus enabling independent control of force and speed for each section
Solution Approach 2:
The system dynamically reconfigures hydraulic flow distribution through the valve section, which can adjust flow allocation to different drive sections in real-time. This allows the tractor to transition between high-speed conveyance mode (fewer sections active) and high-force milling mode (more sections active) during operation
2Adaptability or versatility
If the tractor is built with a fixed number of modules based on predicted requirements, then the configuration is determined upfront, but there is no control of the configuration once deployed in the well
Solution Approach 1:
The hydraulic valve section is controlled by a simple pressure-differential mechanism that automatically routes hydraulic flow based on the operational state of downstream components. This self-regulating system enables dynamic reconfiguration without requiring complex external control systems or additional wiring during deployment
Solution Approach 2:
The valve section acts as an intermediary component between the hydraulic power pack and the drive sections. It mediates the hydraulic flow distribution and enables configuration changes through its internal pressure-sensitive valves, which respond to load conditions and activate appropriate drive sections automatically
3Ease of operation
If hydraulic supply lines are used to actuate all hydraulic components, then the system is simple, but there is insufficient control over operational parameters such as axial force and torque
Solution Approach 1:
The hydraulic supply system is divided into multiple controlled outlets in the valve section, each independently regulating flow to specific hydraulic motors and cylinders. This segmentation enables separate control of axial force (through cylinders) and torque (through motors) by adjusting flow to respective components without affecting others
Solution Approach 2:
Each outlet in the valve section provides localized flow control with dedicated pressure and flow characteristics tailored to the specific hydraulic component it serves. This allows different operational parameters (force for cylinders, torque for motors) to be optimized independently for each actuator group
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 configuration enhances the downhole tractor's performance by allowing precise control of operational modes, reducing tractor length, and enabling it to navigate obstacles, thus improving efficiency and reliability in oil well operations.
Implementation Method 1
a hydraulic power pack; a first hydraulic supply line for supplying hydraulic fluid to the plurality of hydraulic cylinders; a second hydraulic supply line for supplying the hydraulic fluid to the plurality of hydraulic motors
Implementation Method 2
a valve section comprising respective parts of said hydraulic supply line, and an inlet for receiving the hydraulic fluid, and a set of valves
Data Source
AI summary
A downhole tractor having a hydraulic system for driving a plurality of hydraulic cylinders and a plurality of hydraulic motors. The system comprises: a hydraulic power pack; a first hydraulic supply line for supplying hydraulic fluid to the plurality of hydraulic cylinders; a second hydraulic supply line for supplying hydraulic fluid to plurality of hydraulic motors; a valve section comprising a respective part of first hydraulic supply line and a further respective part of second hydraulic supply line, valve section further comprising an inlet for receiving hydraulic fluid, and a set of valves, and a hydraulic bypass supply line coupled to hydraulic power pack for supplying hydraulic fluid directly to the inlet of valve section bypassing at least part of first hydraulic supply line and second hydraulic supply line. The first and the second hydraulic supply line each comprise two parts connected via respective part in the valve section. Each respective part is connected to a respective sub-set of plurality of hydraulic components. The valve section configured for individually controlling flow of hydraulic fluid into each respective part of hydraulic supply lines.