Identification of Drilling Efficiency Using Log-Derived Cation Exchange Capacity in Shale Formation

Ahmed Habeeb Alshamy,Faleh H M Almahdawi

doi:10.52716/jprs.v11i3.532

Ahmed Habeeb Alshamy, Faleh H M Almahdawi

Open Access

https://doi.org/10.52716/jprs.v11i3.532

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Abstract

Shale and shaly formations constitute about 70% to 80% of the total rock formations drilled worldwide, and the most of footage drilled in gas and oil wells is in shale and shaly rocks. Drilling in shale sections in many cases causes wellbore instability and slow drilling problems. In this study, cation exchange capacity of shale is estimated using a relatively simple petrophysical model. The validation of this model is achieved with experimental values of cation exchange capacity. The estimation of cation exchange capacity by this model and common logs data has exhibited potentiality for distinguishing effective/ineffective drilling in shale formations. Drilling and petrophysical data gathered at controlled condition is required in order to optimize the proposed technique. Have knowledge of properties and location of shales permits for remedial actions in future offset well or while drilling in case of logging while drilling (LWD) is used

Highlights

Optimization of drilling rate plays an important role in reducing of drilling operation expense [1]
Oil and gas industry gives a lot of attention for drilling in the shale formations due to the remedial practice to pass the problems experienced in such formations is by using oil-based mud and polycrystalline diamond compact, PDC, bits
Using a novel inhibitive drilling fluid to reduce the interaction between the water-based mud and sensitive shale rock is considered one of the main keys to performing aims of high levels of wellbore stability, minimize dilution rate, bit balling problem, hole gauge and enhanced economics of drilling operation

Summary

Introduction

Optimization of drilling rate plays an important role in reducing of drilling operation expense [1]. Using a novel inhibitive drilling fluid to reduce the interaction between the water-based mud and sensitive shale rock is considered one of the main keys to performing aims of high levels of wellbore stability, minimize dilution rate, bit balling problem, hole gauge and enhanced economics of drilling operation. Using of a lot of these water-based muds has not prevented the incidents of bit balling and cuttings accretion, in turn will cause in lost time and reducing of drilling rate [12]. Using these muds for drilling shale formations is not always potential or suitable. It is capable of driller to detect the drilling rate and to preserve it at efficient level

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