Reconstruction of Pipe Displacement Based on High-Frequency Triaxial Accelerometer Measurements
- Eric Cayeux (IRIS/DrillWell)
- Document ID
- Society of Petroleum Engineers
- IADC/SPE Drilling Conference and Exhibition, 6-8 March, Fort Worth, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. IADC/SPE Drilling Conference and Exhibition
- 1.10 Drilling Equipment, 1.12 Drilling Measurement, Data Acquisition and Automation, 1.8 Formation Damage, 1.6 Drilling Operations, 7 Management and Information, 7.2 Risk Management and Decision-Making, 7.2.1 Risk, Uncertainty and Risk Assessment, 1.6.1 Drill String Components and Drilling Tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.10.2 Directional Drilling Systems and Equipment, 1.12.1 Measurement While Drilling
- Laboratory validation, Real-time interpretation, Drill-string vibration, Accelerometer
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Heavy vibrations in the bottom hole assembly (BHA) may cause permanent damage to the bit or other BHA components, like measurement while drilling (MWD) tools or rotary steerable systems (RSS). Tool- joints along the drill-string may get warned out by high levels of whirl along the drill-string. Repetitive shocks of drill-pipes against the formation may be the origin of wellbore instabilities or cause malfunctions of the communication network of wired drill-pipe high speed telemetry communication systems.
Because of all these potential problems, it is important to better understand how pipes move inside a wellbore. High frequency recordings of triaxial accelerometer measurements at different locations inside the BHA, or along the drill-string, open the possibility to reconstruct the actual displacement of drill-string tubulars. However, because accelerometer readings are taken in a reference frame that is not in uniform movement compared to a fixed referential, the readings are subject to complex effects of centrifugal, Coriolis and Euler accelerations that make the estimation of the pipe movement rather intricate.
Without considering these so-called fictitious accelerations, it is easy to misinterpret the actual movement of the accelerometers attached to a pipe. For that reason, a numerical method has been developed to calculate the displacement of the support of the accelerometers. To validate the numerical model, a laboratory setup has been built that allows for a precise control of the movement of an element that supports three triaxial accelerometers. The known displacements of the accelerometer support and the reconstructed displacements have been compared and a methodology has been developed to use the redundant measurements to reduce the uncertainty of the estimated movement resulting from inaccuracies around the exact position and orientation of the accelerometers relatively to its support.
Lately, several publications have reported results from high frequency triaxial measurements at different locations along the BHA and the drill-string, while others have pointed out the risk of misinterpretation associated with the existence of fictitious accelerations. This paper presents a validated numerical method that allows for an accurate reconstruction of the displacement of drill-string and BHA elements therefore providing a unified point of view to the problem of estimating drill-pipe displacements based on accelerometer measurements.
|File Size||4 MB||Number of Pages||30|
Bowler, A., Harmer, R., Logesparan, L., Sugiura, J., Jeffryes, B., Ignova, M., 2016. "Continuous High- Frequency Measurements of the Drilling Process Provide New Insights Into Drilling-System Response and Transitions Between Vibration Modes". Paper SPE-170713-PA published in SPE Drilling & Completion, vol. 31, issue 02, pp. 106&-118.
Oueslati, H., Jain, J.R., Reckmann, H., Ledgerwood, L.W., Pessier, R., Chandrasekaran, S., 2013 "New Insights Into Drilling Dynamics Through High-Frequency Vibration Measurement and Modeling". Paper SPE-166212-MS presented at the SPE Annual Technical Conference in New Orleans, Lousiana, USA, 30 Sep- 2 Oct.