Bidirectional Rolling Device for Ultra-Deep Non-Vertical Drilling
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Solution Overview
Problem
Current in-situ stress measurement methods for ultra-deep non-vertical drilling face issues such as equipment damage from sliding friction, blurred markings from impression tests, complex installation processes, and unreliable binding of high-pressure hoses.
Innovation Solution
The use of a split-type axial-force-free circuit switching valve and a bidirectional rolling device in a single-pipeline hydraulic fracturing method, which reduces axial force and converts sliding friction into rolling friction, thereby protecting equipment and markings during ultra-deep drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If in-hole equipment is dragged manually or mechanically through the drilled hole, then installation and withdrawal can be completed, but the equipment slides and rubs against the hole wall causing serious wear and damage
Solution Approach 1:
A rolling device with rollers is introduced as an intermediary between the in-hole equipment and the hole wall. The rollers convert sliding friction into rolling friction, significantly reducing wear on both the equipment and the hole wall during installation and withdrawal operations.
Solution Approach 2:
The mechanical dragging system is replaced with a rolling system. Instead of directly dragging equipment through the hole, the patent uses a rolling device that reduces frictional resistance and protects equipment from wear while maintaining the ability to install and withdraw equipment.
2Ease of operation
If in-hole equipment slides against the hole wall during withdrawal, then equipment can be removed, but markings from impression tests are erased or blurred leading to test failure
Solution Approach 1:
The rolling device serves as a mediator that protects the impression machine markings during withdrawal. By converting sliding friction to rolling friction, the rollers prevent direct contact between the equipment and hole wall that would otherwise erase or blur the markings.
3Reliability
If double-pipeline measurement equipment is used, then hydraulic fracturing measurement can be performed, but the installation and withdrawal process becomes complicated with more high-pressure hoses
Solution Approach 1:
The patent merges the functions of multiple high-pressure hoses into a single integrated rolling device. The rolling device incorporates both high-pressure fluid pathways and mechanical rolling functions, eliminating the need for separate double-pipeline systems while maintaining measurement capability.
4Ease of manufacture
If high-pressure hose is tied to drill pipe with binding tape, then connection is established, but worn binding tape leads to unreliable binding and equipment damage
Solution Approach 1:
The binding tape mechanical connection is replaced with a threaded connection system. The rolling device features threaded connections that provide reliable, adjustable, and durable attachment between the high-pressure hose and drill pipe, eliminating the unreliability of worn binding tape.
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 solution effectively reduces wear on equipment and the hole wall, improves measurement reliability, and simplifies the installation and withdrawal processes, making it suitable for ultra-deep non-vertical drilling.
Implementation Method 1
axial movement (i.e., axial sliding) and circumferential rotation of the bidirectional rolling device relative to a drilled hole are rolling friction
Data Source
AI summary
An in-situ stress measurement device for ultra-deep non-vertical drilling adopts a technical route of single channel and bidirectional rolling of in-hole equipment, and its related functions are mainly realized by a bidirectional rolling device and a split-type axial-force-free circuit switching valve. The bidirectional rolling device can drive the in-hole equipment to move freely in a circumferential direction and back and forth, which changes sliding friction between the in-hole equipment and a hole wall into rolling friction during an in-situ stress measurement of non-vertical drilling. The split-type axial-force-free circuit switching valve provides a technical solution for a single-pipe test in the non-vertical drilling. The device greatly reduces wear of the in-hole equipment and the hole wall when the in-hole equipment is installed and withdrawn, can effectively protect markings of an impression measurement, and is suitable for high-efficiency in-situ stress measurement by a hydraulic fracturing method in the non-vertical ultra-deep drilling.