Drilling Mechanics Analysis of Record Hybrid Drill Bit Runs in Gulf of Mexico Salt Formation and its Correlation with Rock-Mechanical Properties of Salt
- Umesh Prasad (Baker Hughes, a GE Company) | Ashabikash Roy Chowdhury (Baker Hughes, a GE Company) | Mark Anderson (Chevron U.S.A. Inc.)
- Document ID
- Society of Petroleum Engineers
- SPE Annual Technical Conference and Exhibition, 30 September - 2 October, Calgary, Alberta, Canada
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- Dual cutting mechanics, drilling optimization, Rock mechanics, Hybrid drill bit, Salt deformation and failure
- 11 in the last 30 days
- 188 since 2007
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Operators face the continuing challenge to improve drilling efficiency for cost containment, especially in deepwater drilling environments where drilling costs are significantly higher. Innovative drilling technologies have been developed and implemented continuously to support the initiative. In many areas of the world, including the Gulf of Mexico (GOM), hydrocarbon reservoirs exist below thick non-porous and impermeable sequences of salt that are considered a perfect cap rock. However, salt poses varied levels of drilling challenges due to its unique mechanical properties.
At ambient conditions, the unconfined compressive strength (UCS) of salt varies between 3,000 to 5,000 psi; however, the strain at failure for salt can be an order of magnitude higher when compared to other rocks. Consequently, during drilling salt's viscoelastic behavior requires that its must be broken with an inter-crystalline or trans-crystalline grain boundary breakage. When compared to other rock types, the unique isotropic nature of salt results in a level of strain that is much higher for the given elastic moduli. This strain level makes salt failure mechanics different from other rock types that are prevalent in the GOM.
Hybrid bits combine roller-cone and polycrystalline diamond compact (PDC) cutting elements to perform a simultaneous on-bottom crushing / gouging and shearing action. Two divergent cutting mechanics pre-stresses the rock and apply high strain for deformation and displacement, resulting in highly efficient cutting mechanics. To meet the drilling objectives, different hybrid designs have been implemented to combine stability and aggressiveness for improved drilling efficiency. An operator, while drilling salt sections at record penetration rates, has successfully used this innovative process of rock failure utilizing the dual-cutting mechanics of hybrid bits. This has resulted in significant value additions for the operator.
This paper analyzes field-drilling data from successful GOM wells and attempts to correlate salt failure mechanics and provide insight into dual-cutting mechanics and its correlation with salt failure. The paper also reviews the drilling mechanics of hybrid bits in salt and highlights importance of dual-cutting mechanics for achieving higher penetration rates in salt through improved drilling efficiency.
|File Size||1 MB||Number of Pages||16|
Roy Chowdhury, A.,Callais, R.,Rodrigue, W.Anderson, M.,. 2017. Meeting the Large-Diameter Drilling Challenges and Securing Sustainable Performance Gains Using Hybrid Bit Technology in Deepwater Gulf of Mexico. Presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 9-11 October, SPE-187052.
Roy Chowdhury, A. and Groetsch, R., 2017. Innovative Torque Management Using Dual Cutting Mechanics of Hybrid Bit Enhances Stability While Control Drilling in Sediment and Salt with Concentric Reamer in Gulf of Mexico. Presented at the AADE National Technical Conference and Exhibition, Houston, Texas, 11-12 April, AADE-17-NTCE-068.
Roy Chowdhury, A.,Serrano, R. and Rodrigue, W., 2019. Pilot Bit and Reamer Matching: Real-Time Downhole Data Differentiates Hybrid Drill Bit's Suitability with Concentric Reamer in Deepwater Gulf of Mexico Application. Presented at the SPE/IADC International Drilling Conference, The Hague, The Netherlands, 5-7 March, SPE/IADC-194060-MS.