Drilling With Induced Vibrations Improves ROP and Mitigates Stick/Slip in Vertical and Directional Wells
- J. R. Clausen (National Oilwell Varco) | A. E. Schen (National Oilwell Varco) | I. Forster (National Oilwell Varco) | J. Prill (National Oilwell Varco) | R. Gee (National Oilwell Varco)
- Document ID
- Society of Petroleum Engineers
- IADC/SPE Drilling Conference and Exhibition, 4-6 March, Fort Worth, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2014. IADC/SPE Drilling Conference and Exhibition
- 4.1.2 Separation and Treating, 4.1.5 Processing Equipment, 1.10 Drilling Equipment, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.5.1 Bit Design, 1.6.6 Directional Drilling, 4.3.4 Scale, 1.5 Drill Bits, 1.6.2 Technical Limit Drilling, 1.6 Drilling Operations, 1.12.1 Measurement While Drilling, 7.2.2 Risk Management Systems, 1.6.1 Drilling Operation Management, 1.4.1 BHA Design
- rate of penetration, stick slip, Agitator, Induced Vibration, performance drilling
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For years drillers have been taught to mitigate all vibrations in the drill string while drilling to maximize Rate of Penetration (ROP), limit bit damage, and extend bit life. While limiting lateral vibrations and stick slip are proven ways to improve performance and maintain directional control, in recent years it has been conclusively proven in the field that inducing axial vibrations with specialized downhole tools can significantly improve lateral reach. Currently, however, the benefits of downhole oscillation tools have not been thoroughly studied for other performance gains, such as improved ROP in non-directional wells.
An extensive research study, including lab and field testing, found that a low-frequency, benign axial vibration can increase the ROP significantly in all well types. Initial laboratory experiments where performed by inducing axial vibrations into the drilling process on a small scale drill bit in hard rock. Dramatic improvements in ROP and drilling efficiency were observed, with the added benefits of improved bit life and an unexpected reduction in stick-slip.
This lab experiment was later tested in the field by utilizing a proven downhole oscillation tool in an active Bottom Hole Assembly (BHA) to create the effect that was simulated in the lab. The field tests provided data similar to the lab tests: significant performance gains were observed in several test wells using the downhole oscillation tool as compared to offset data. In addition, this same downhole oscillation tool showed drastically improved directional control when run above a Rotary Steerable System (RSS) tool, and stick-slip was practically eliminated with no negative effect on bit life or BHA reliability.
High-speed sensor data collected at the bit during both the lab and field tests will further demonstrate the validity of the theory. In addition, testing for a hard-rock application with roller cone bits is forthcoming, as the data indicates possible performance gains in this environment as well.
Overall, the study revealed many benefits such as improving well placement, reducing time to Total Depth (TD) and Non-Productive Time (NPT) by preventing BHA component damage through beneficial axial vibrations from the downhole oscillation tool. The data indicates that “benign vibration” can drastically improve drilling performance.
|File Size||8 MB||Number of Pages||20|