Field Data Analysis and Modeling of Drillstring Vibrations to Identify Inefficiency in Deep Geothermal Drilling

Conference · Fri Jun 18 04:00:00 EDT 2021 · Paper Number: ARMA-2021-2015

OSTI ID:1844941

Barnett, Laymon ^[1]; Klein, Kevin ^[2]; Al Dushaishi, Mohammed ^[2]; Nygaard, Runar ^[3]; Hareland, Geir ^[2]

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1. Oklahoma State Univ., Stillwater, OK (United States); Oklahoma State University
2. Oklahoma State Univ., Stillwater, OK (United States)
3. University of Oklahoma

One challenge that hinders efficient drilling and causes downhole tool failures is severe drillstring vibrations. The objective of this paper is to identify the root cause of drillstring vibrations in deep geothermal wells and investigate their effect on drilling performance using data analytics and vibration modeling. A near-bit sub was utilized to collect vibration data, where the burst data was used to obtain the drillstring torsional natural frequency. The data showed that the highest lateral acceleration and stick-slip severities (SSS) occur at the higher mechanical specific energy (MSE) range, while the low vibration levels were encountered in the optimum range of the MSE curve. The elevated SSS levels consistently occur at the low to mid-range of applied RPM and the highest sonic velocity. Additionally, the lateral acceleration levels are higher at the low to mid-range of the applied RPM. The effect of drillstring vibration on drilling performance was recognized by the presented MSE analysis.

• Research Organization: Oklahoma State University
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office
• DOE Contract Number: EE0008603
• OSTI ID: 1844941
• Report Number(s): Paper Number: ARMA-2021-2015
• Conference Information: Journal Name: Paper Number: ARMA-2021-2015
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
data quality
log analysis
well logging
drill pipe selection
drilling operation
drillstring design
drilling equipment
frequency
stick-slip severity