Dynamic Tripping Speed Control for Well Pressure Stability
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Solution Overview
Problem
Continuous tripping operations in oil and gas drilling lead to pressure variations causing surge and swab pressures, which can affect well stability and result in undesirable influxes or mud losses, due to the movement of drill pipes and frictional forces with drilling fluid.
Innovation Solution
A system comprising a hardware suite of processors and software programs that determine and control limiting speeds for continuous tripping operations, using a computing system to manage the tripping apparatus and associated components to adjust speeds based on pressure values and characteristics, thereby maintaining well stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous tripping operations are performed at high speed, then productivity is improved, but pressure variations causing surge and swab pressures increase leading to well instability
Solution Approach 1:
The system dynamically adjusts tripping speed based on real-time well conditions, drill string position, and pressure characteristics. The control system modifies the speed profile during tripping operations to maintain well stability while maximizing productivity, transitioning from static speed limits to dynamic speed optimization.
Solution Approach 2:
The system implements closed-loop feedback control by continuously monitoring well pressure, drill string position, and tripping speed. The control system uses this feedback to adjust tripping speed in real-time, ensuring that speed modifications respond to actual well conditions and prevent surge and swab pressures.
2Loss of time
If tripping speed is increased to reduce non-productive time, then loss of time is reduced, but pressure fluctuations increase causing mud losses and influxes
Solution Approach 1:
The system applies periodic speed modifications during tripping operations, adjusting speed in a controlled manner based on drill string position and well characteristics. This periodic adjustment pattern allows the system to maintain higher average speeds while preventing dangerous pressure fluctuations through controlled speed variations.
Solution Approach 2:
The system changes the speed parameter dynamically during tripping operations based on multiple factors including drill string position, well depth, fluid properties, and pressure characteristics. By continuously adjusting the speed parameter rather than maintaining a constant speed, the system optimizes both time efficiency and pressure stability.
3Reliability
If limiting speeds are imposed to maintain well stability, then well stability is improved, but productivity decreases due to slower tripping operations
Solution Approach 1:
The system replaces static speed limits with dynamic speed optimization, allowing tripping speeds to vary based on real-time well conditions. This dynamic approach maintains well stability through necessary speed restrictions while maximizing productivity by allowing higher speeds when conditions permit, eliminating the need for overly conservative constant speed limits.
Solution Approach 2:
The system performs preliminary calculations and simulations to determine optimal tripping speed profiles before operations begin. By pre-calculating speed recommendations based on well characteristics, drill string properties, and fluid dynamics, the system prepares optimized speed profiles that balance stability and productivity before actual tripping operations commence.
Data Source
AI summary
A system includes a processing device configured to determine a tripping operation to be undertaken. The processing device is configured to also calculate a variable tripping speed for the tripping operation to vary a speed of the tripping operation. The processing device is further generate an output to control the operation of a portion of a continuous tripping system to implement the tripping operation at the variable tripping speed.