Workovers during the Life of a Well

DSATS Automated Drilling CompetitionJungyong KimPrudhvi MohanNarendra VishnumolakalaTianbo Zhai

Dec, 31st 2014

First of all, We, the team Texas A&M, would like to thank the Drilling Systems Automation Technical Section for giving us the opportunity to work on this project. We are consist of 4 members from different discipline. Jungyong and Narendra are from the petroleum engineering department, Prudhvi is a graduate student from the Electrical engineering department. Lastly, Tianbo is from the Mechanical Engineering department.

OutlineDrilling Rig Construction Control System DesignConclusion 2

The objective of our design is three folds, first is to design a miniature drilling rig with the same functionality of an actual drilling rig. Second is to simulate full drilling automation to achieve the drilling optimization minimizing drilling dysfunction using MSE concepts. The third objective is to design the system in such a way so that our final project, that is the drilling rigs and the automation control system, can be used by the university or it can be utilized in the actual field operation. Of course with safety in mind.

Drilling Rig ConstructionDrilling rig with functionality of a mobile land rig

Four Steel support pipes for mobility and stability

Variable RPM Motor representing a Top Drive system

Hoisting system to accurately measure and control the WOB with a Load Cell

Close loop air circulation system with air as drilling fluid

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The solid model represent the actual drilling rig that we will fabricate next semester. As it can be seen, we are going to fabricate a miniature rig similar to the mobile land rig. For the rigs mobility, four steel pipes with rollers supporting the rig floor will be used, and there will be anchors for all the rollers to have the stability of the drilling rig. Other important fabrication is the bell nipple. The bell nipple that we will construct will not only function as the flow outline for the cuttings, but will have a functionality of a stabilizer. By having a bell nipple in our design, we believe that we can minimize the lateral vibration to some degrees. We are going to have a 2 hp. Variable RPM motor, representing the top drive. The hoisting system we have will be able to raise and lower the drill string during the process to control the weight on bit. For the drilling mud circulation system, we are going to use air pump to pump the air through the swivel, down the drill bit, up to the annular space and finally to the flow outline. We believe that using air is going to be good enough to cool the bit and carry all the cuttings. It is not shown in the solid model, However, we will fabricate the close loop circulation system with enough seal so that water or any other fluids can be used as the mud if necessary.

Control System DesignDysfunctions encountered down-hole

Bit balling

Bottom-hole balling

Lateral Vibrations (Whirl)

Torsional Vibration (Stick-slip)

Axial Vibration

Interfacial Severity

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Control System DesignControl Algorithm

Using Mechanical Specific Energy (MSE)

Basic Principle:

Increase WOB until something limits you from doing so

Make real time changes that extend the limiter (whether it is bit or non-bit)

Redesign the system post-drill to extend the limiter

Repeat 1-3

5Source : Prof. Fred Dupriest Lecture notes on Bit Mechanics

Control System DesignAlgorithm to Mitigate Dysfunction

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Control System DesignInstrumentation

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Simulation FeaturesSimulation of the design is performed using National Instruments graphical programming software LabVIEWIn the absence of actual sensors, actuators or data acquisition devices, we made use of NI simulated devices to fabricate the dataData Visualization Real time monitoring of drilling operation down-hole

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Simulation FeaturesData Visualization Real Time Data Logging

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Simulation FeaturesManual Override and Control using Joystick

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Simulation FeaturesAlarm System

11Source : Prof. Fred Dupriest Lecture notes on Bit Mechanics

Simulation FeaturesSimulation Results

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ConclusionWe will fabricate a miniature drilling rig with the functionality of an actual rig

Full drilling automation will be carried out with ROP optimization in mind using the MSE concept

The project will also be beneficial to the university and in achieving drilling automation

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CD-Consolidated Drainage Test

This is global and local, including heterogeneity