Distributed Dynamics Feasibility Study
- Piero D'Ambrosio (NOV Downhole Tools & Pumping) | Reisha Bouska (National Oilwell Varco) | Alan James Clarke (NOV) | Jason L. Laird (National Oilwell Varco Downhole Tools Division) | James E. Mckay (BP) | Stephen T. Edwards (BP)
- Document ID
- Society of Petroleum Engineers
- IADC/SPE Drilling Conference and Exhibition, 6-8 March, San Diego, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2012. IADC/SPE Drilling Conference and Exhibition
- 1.6 Drilling Operations, 5.8.2 Shale Gas, 1.6.1 Drilling Operation Management, 1.5.1 Bit Design, 1.4.1 BHA Design, 7.2.2 Risk Management Systems, 1.10 Drilling Equipment, 1.5 Drill Bits, 4.1.5 Processing Equipment, 4.3.4 Scale, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 4.1.2 Separation and Treating
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The advent of wired drill pipe has the ability to allow a variety of measurements to be distributed throughout the whole drilling assembly. One such measurement is acceleration to better determine the impact of how vibration events are distributed through from the bottom hole assembly to the upper drillstring or vice versa. In turn we can now investigate the potential use of distributed dynamics by utilizing a set of designed for purpose independent Downhole Dynamic Data Recorders (DDDR), for real-time decision making. A test project was executed to acquire vibration data along the drill string on a horizontal well in Oklahoma's Woodford Shale. This project allowed the evaluation of data acquired from the bit and the bottom hole assembly (BHA), in the horizontal section, as well as the sensors located in the upper assembly showing the dynamics throughout the vertical section, curve, and landing point of the horizontal.
This paper focuses on the analysis of the measurements gathered during the project and it will provide detailed descriptions of the obtained results. Several concepts as well as common known misconceptions related to drilling dynamics will be discussed, among them the decoupling effect of the mud motor to drilling vibrations, the value of downhole torque, weight and bending moment for the understanding of distributed dynamics along the drill string. The importance of the vibration sensors' placement and data recording frequency in order to diagnose and mitigate drilling dysfunctions will also be discussed.
In order to investigate the feasibility of using distributed dynamics for real-time decision-making, five independent DDDRs were placed in four drilling assemblies on a horizontal well in Hughes County, Oklahoma (Woodford). This technology allows downhole drilling performance to be recorded at high frequency and at multiple positions in the bottom hole assembly (BHA) and drill string. The DDDR is a memory mode vibration logging tool that can be placed anywhere in the BHA and drill string. The tool is comprised of a carrier sub and vibration-recording plug that screws into the carrier sub. The DDDR measures lateral accelerations and temperature and derives torsional response. The high-speed data acquisition and the positioning of the single-axis accelerometer within the tool provide the following outputs: (Reference: SPE/IADC 92336)
- Downhole Temperature
- Maximum Lateral Accelerations - Magnitude of the absolute maximum highest recorded acceleration during the time period for statistical calculation. There is no consideration of the duration of the acceleration.
- RMS Lateral Accelerations - Standard deviation of samples within the time period for statistical calculation. Standard deviation (SD) is used industry-wide as the measurement of statistical dispersion and average vibration intensity. SD is zero if all the data samples are equal, SD is small if many data samples are close to the mean, and SD is large if many data samples are far from the mean.
- Downhole RPM - Mean rotary speed of the DDDR within the time period for statistical calculation.
|File Size||1 MB||Number of Pages||18|