A Petro-Mechanical Approach to Completions Optimization in the Bakken
- Carrie Glaser (Fracture ID) | Kyle Trainor (NP Energy Services) | Joel Mazza (Fracture ID)
- Document ID
- Society of Petrophysicists and Well-Log Analysts
- SPWLA 60th Annual Logging Symposium, 15-19 June, The Woodlands, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2019. held jointly by the Society of Petrophysicists and Well Log Analysts (SPWLA) and the submitting authors
- 12 in the last 30 days
- 117 since 2007
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Completions operations account for a significant portion of well costs and therefore strongly impact the return on investment (ROI) of an oil and gas project. Optimization of completions parameters including stage length, cluster design, and fluid and proppant volumes is often done using a statistical analysis of a large number of wells. These results may be inconclusive if there is variability between the analyzed reservoir and the character of the reservoir where the analysis is applied. If the variability is too great, or cannot be accurately accounted for, significant proportions of new wells drilled and completed using these base assumptions will likely be sub-optimal performers.
Incorporation of petrophysical analyses and poststimulation production data in the lateral section of horizontal wellbores reduces the uncertainty in interpreting and comparing production, or stimulation results between wells and can improve the learning curve, thus shorting the cycle time to achieve an optimized completion. Key areas of influence include interpretation of minimum horizontal stress to reduce stress variance across each stage, evaluating the role of natural fractures in stimulation and production, identifying possible sources of water production and providing a reservoir quality (porosity and permeability) interpretation that facilitates a maximum ROI for each well.
The workflow outlined here incorporates fluid tracers with in-situ mechanical data from drill bit accelerations to provide a petrophysical interpretation and completions optimization strategy shown to significantly improve ROI in the Bakken Formation in North Dakota.
DRILLBIT VIBRATION DATA ACQUISITION
Acquisition of vibration data generated by the drill bit to rock interaction began in the 1960’s with tools that measured vibrations at the kelly bushing. It was recognized at that time that different vibration patterns correlated to bit damage, and developers believed that the tool had “a promising future in developing knowledge of the mechanical characteristics of the rock at the time of drilling” (Lutz et al, 1972).
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