Drilling Mechanics Analysis of Record Hybrid Drill Bit Runs in Gulf ofMexico Salt Formation and its Correlation with Rock-Mechanical Propertiesof Salt

摘要

Operators face the continuing challenge to improve drilling efficiency for cost containment,especiallyin deepwater drilling environments where drilling costs are significantly higher.Innovative drillingtechnologies have been developed and implemented continuously to support the initiative.In many areasof the world,including the Gulf of Mexico(GOM),hydrocarbon reservoirs exist below thick non-porousand impermeable sequences of salt that are considered a perfect cap rock.However,salt poses varied levelsof drilling challenges due to its unique mechanical properties.At ambient conditions,the unconfined compressive strength(UCS)of salt varies between 3,000 to 5,000psi;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 uniqueisotropic nature of salt results in a level of strain that is much higher for the given elastic moduli.This strainlevel 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 performa 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 cuttingmechanics.To meet the drilling objectives,different hybrid designs have been implemented to combinestability and aggressiveness for improved drilling efficiency.An operator,while drilling salt sections atrecord 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 failuremechanics and provide insight into dual-cutting mechanics and its correlation with salt failure.The paperalso reviews the drilling mechanics of hybrid bits in salt and highlights importance of dual-cutting mechanicsfor achieving higher penetration rates in salt through improved drilling efficiency.