Crowding Avoidance Sub Real-Time Drill String Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Drill bits in deep-earth drilling operations often fail due to inability to detect crowding or crashing in real-time, leading to costly downtime and damage, as existing technologies lack effective means to manage the feed rate of the drill string in response to changing formation hardness.
Innovation Solution
A crowding avoidance system (CAS) is introduced, comprising sensors and a data connection system that detects parameters like vibration frequency and sends real-time data to the surface, allowing for immediate adjustment of the drill string's descent rate to prevent bit overload and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time detection of crowding conditions is implemented, then bit damage is prevented, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical detection systems with electronic sensors (accelerometers, gyroscopes, vibration sensors) that can detect crowding conditions through electrical signals. This substitution maintains high reliability in bit damage prevention while reducing mechanical complexity through the use of modern electronic sensing technology.
Solution Approach 2:
The patent introduces electronic sensors as intermediary devices between the drilling system and the control system. These sensors act as mediators that detect physical parameters (vibration, acceleration, rotation speed) and convert them into actionable data, enabling real-time monitoring without requiring direct mechanical intervention in the drilling process.
2Productivity
If real-time control of feed rate is implemented, then productivity is maintained, but device complexity increases
Solution Approach 1:
The patent implements a feedback control system where sensors continuously monitor drilling parameters and feed this information to a controller that adjusts the feed rate in real-time. This closed-loop feedback mechanism maintains optimal productivity by automatically responding to changing formation conditions without requiring complex manual intervention or overly sophisticated control architecture.
Solution Approach 2:
The control system is designed to automatically adjust feed rate based on sensor inputs without requiring constant operator intervention. The system serves itself by using its own sensor data to make real-time control decisions, reducing the need for external complexity while maintaining high productivity through autonomous adaptation to drilling conditions.
3Loss of time
If sensor data is transmitted in real-time, then response time is reduced, but loss of time in data transmission occurs
Solution Approach 1:
The patent implements preliminary action by pre-processing sensor data at the source and establishing real-time communication channels before critical events occur. Data is collected, processed, and transmitted as soon as it becomes available, ensuring that information reaches the control system with minimal delay. This preliminary data preparation and transmission infrastructure reduces both response time and information loss by having the system ready to act on incoming data immediately.
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 CAS effectively reduces the risk of bit damage and downtime by enabling real-time control of the drill string's feed rate, preventing crowding and crashing, thus minimizing non-productive time and costs associated with bit replacement.
Implementation Method 1
sensors and a data connection system that detects parameters like vibration frequency
Data Source
AI summary
A crowding avoidance sub (CAS), in or above a bottom hole assembly (BHA), e.g., between drill string and BHA, sends sensor data over lines in a modified housing and flex lines accommodating and reporting relative axial motion between movable parts of a single sub, typically below a cushion, jar, or shock sub, possibly even a motor. Sensors connected to an Intellisys™ data connection system provide a data stream to a computer at the surface, and may include downhole preprocessing, but need not. The drive system of the hook feed rate is directly controlled in real time by a data station receiving, and operating based on, “travel” or “progress” information received from downhole sensors of the CAS indicating effectively instantly and electronically (rather than slower signals through drilling fluid) whenever the string progresses dangerously faster than the bit, and must be slowed or stopped.