Compact MWD Sensor Assembly for Unconventional Well Drilling
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Solution Overview
Problem
Existing MWD systems are not well-suited for drilling unconventional wells, facing challenges with measurement accuracy, BHA incompatibility, and cost-effectiveness, particularly in long, deviated laterals requiring advanced hydraulic fracturing for production.
Innovation Solution
A compact and modularly reduced MWD system with a novel combination and placement of sensors for drilling dynamics, rotary inclination, azimuthal gamma, and dual pressure measurements, integrated into a shorter BHA sensor assembly, enabling precise wellbore placement and geosteering, and compatible with automation systems like MPD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing MWD systems are used for unconventional wells, then general drilling functionality is maintained, but measurement accuracy and BHA compatibility deteriorate
Solution Approach 1:
The MWD system is divided into modular sensor assemblies that can be independently configured and integrated into different BHA types. Each sensor module (inclination, azimuth, gamma ray, resistivity) is a separate unit that can be selectively combined, allowing the system to adapt to various BHA configurations while maintaining measurement accuracy through optimized sensor placement in each module.
Solution Approach 2:
The sensor assemblies are designed with universal mounting interfaces and standardized communication protocols that enable compatibility across multiple BHA types including conventional, flexible, and automated drilling systems. The same sensor package can be deployed in different well configurations (vertical, deviated, horizontal) without requiring system redesign, thus achieving both measurement precision and BHA versatility.
2Adaptability or versatility
If full-featured MWD systems are deployed, then comprehensive measurement capabilities are achieved, but system cost and complexity increase
Solution Approach 1:
The system employs dynamic sensor selection where the measurement suite is automatically configured based on the specific well requirements, formation characteristics, and drilling stage. Not all sensors are activated simultaneously; instead, the system dynamically enables only the necessary measurement types for each operational phase, reducing complexity while maintaining comprehensive measurement capability when needed.
Solution Approach 2:
Different sensor assemblies are optimized for specific measurement functions and deployed only where needed along the wellbore. For example, gamma ray sensors are positioned in intervals where formation logging is required, while inclination and azimuth sensors are continuously active. This localized deployment approach provides comprehensive measurement types without requiring all sensors to be present in every section, thereby reducing overall system complexity.
3Adaptability or versatility
If longer BHA sensor assemblies are used, then more sensor types can be integrated, but drilling efficiency and wellbore placement accuracy decrease
Solution Approach 1:
Multiple sensor types are integrated into a nested, compact assembly where smaller sensor modules are housed within a shared protective structure and common electronics platform. The inclination sensors, azimuth sensors, gamma ray detectors, and resistivity measurement tools are arranged in a nested configuration that minimizes the overall axial length while maintaining all measurement capabilities. This nested design reduces BHA length, improving drilling efficiency and wellbore placement accuracy without sacrificing sensor versatility.
4Reliability
If dedicated MWD personnel are required, then operational control is maintained, but operational costs increase
Solution Approach 1:
The MWD system incorporates automated diagnostic and self-calibration capabilities that allow the tool to monitor its own performance, detect anomalies, and adjust measurements without human intervention. The system automatically validates sensor readings, compensates for drift, and flags potential issues, reducing the need for dedicated personnel while maintaining reliable operational control through autonomous system management.
Data Source
AI summary
An improved MWD system for drilling unconventional wells. Embodiments provide a particular combination of sensors in a specific arrangement in order to provide a system expressly designed for drilling unconventional wells. By minimizing modularity to reduce the need for redundant/duplicated components, including only sensors specifically needed for unconventional wells, and by separating long-life components such as sensors from components requiring more frequent maintenance or service such as batteries, the components can be more efficiently combined into a BHA sensor assembly having the shortest possible length.