Ring Valve System for Wellbore Steering Pressure Feedback
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Solution Overview
Problem
Steerable drilling systems face challenges in maintaining precise control over wellbore direction during hydrocarbon production well drilling, as existing systems lack effective mechanisms for real-time pressure feedback and adaptive control to optimize steering blade extension and mud-pulse telemetry.
Innovation Solution
A downhole steering tool with a ring valve system that includes a gear housing, manifold, valve seat, and biasing means, allowing for fluid communication and pressure control between steering ports and cylinders, enabling real-time pressure measurement and feedback for adjusting steering blade extension and generating pressure pulses for telemetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a ring valve system is added to provide pressure feedback and control, then steering precision and drilling efficiency are improved, but device complexity increases
Solution Approach 1:
The ring valve system combines the valve seat, valve carrier, biasing means, and fluid communication passages into a single integrated assembly that rotates with the mandrel. This merging of components provides comprehensive pressure control and feedback functionality while minimizing the increase in device complexity through unified design.
Solution Approach 2:
The ring valve system serves multiple functions simultaneously: it controls fluid flow to steering cylinders, provides pressure feedback through the pressure sensor, enables mud-pulse telemetry, and maintains steering blade extension control. This multi-functionality justifies the added complexity by delivering comprehensive measurement and control capabilities in one system.
2Productivity
If real-time pressure feedback and control systems are implemented, then drilling efficiency and steering accuracy are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The ring valve system is divided into distinct modular components including the valve seat with integrated passages, the valve carrier with biasing means, the pressure sensor assembly, and the fluid communication pathways. This segmentation allows each component to be manufactured and tested separately, then assembled into the complete ring valve system, thereby improving manufacturing ease while maintaining drilling efficiency.
3Reliability
If biasing means are added to maintain valve carrier contact with valve seat, then reliability of fluid communication is improved, but device complexity increases
Solution Approach 1:
The biasing means (springs or elastomeric members) automatically maintain contact between the valve carrier and valve seat through elastic or mechanical force, ensuring reliable fluid communication without requiring external actuation or complex control mechanisms. This self-service approach improves reliability while minimizing the increase in device complexity.
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
Enables precise control over wellbore direction, improves drilling efficiency by using pressure data for feedback in steering and telemetry, and detects potential malfunctions in the ring valve system, enhancing the reliability and accuracy of the drilling process.
Implementation Method 1
at least one biasing means positioned between the valve carrier and the lower valve housing and configured to urge the valve carrier away from the lower valve housing
Implementation Method 2
at least one biasing means positioned between the valve carrier and the lower valve housing and configured to urge the valve carrier away from the lower valve housing
Implementation Method 3
the steering blade extendable by an extension force to contact a wellbore, wherein the extension force may be caused by a differential pressure between the steering cylinder pressure and a fluid pressure in the wellbore
Implementation Method 4
The manifold orifice may provide fluid communication between the upper manifold surface and the first steering port and may fluidly couple the bore to the steering cylinder
Data Source
AI summary
A steering tool for use in a wellbore may comprise a tool housing having a bore and containing a steering cylinder, a steering blade, and a ring valve configured to control fluid flow to the steering cylinder. The ring valve may include a gear housing, a manifold fluidly coupling the bore to the steering cylinder, a valve seat, a valve carrier circumferentially supporting the valve seat, an upper valve housing mechanically coupled to the gear housing, a lower valve housing mechanically coupled to the upper valve housing and reciprocably coupled to the valve carrier, and at least one biasing means positioned between the valve carrier and the lower valve housing and configured to urge the valve carrier away from the lower valve housing.