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Research Papers: Petroleum Engineering

Integrated Experimental and Analytical Wellbore Strengthening Solutions by Mud Plastering Effects

[+] Author and Article Information
Saeed Salehi

Assistant Professor
Mewbourne School of Petroleum and
Geological Engineering,
University of Oklahoma,
Norman, OK 73019
e-mail: saeads@gmail.com

Raj Kiran

Researcher
Petroleum Engineering,
University of Louisiana at Lafayette,
Lafayette, LA 70504
e-mail: rajkiran.itbhu@gmail.com

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 10, 2015; final manuscript received November 17, 2015; published online January 11, 2016. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 138(3), 032904 (Jan 11, 2016) (7 pages) Paper No: JERT-15-1250; doi: 10.1115/1.4032236 History: Received July 10, 2015; Revised November 17, 2015

Wellbore stability has plagued oil industry for decades. Inclusion of the mud in drilling and the effect of mud cake build up incorporate very complex chemical, thermal, mechanical, and physical phenomena. It is very difficult to quantify all these phenomena in one model. The after effects of mud cake buildup, its permeability and variation in thickness with time alter the actual stress profile of the formation. To see the impact of the whole mechanism, a combination of laboratory studies and numerical modeling is needed. This paper includes the procedure and results on stress profiles in near wellbore region based on laboratory studies of mud cake buildup in high pressure and high temperature environment using permeability plug apparatus (PPA). The damaged formation zone is very susceptible to drilling fluid and results in alteration of existing pore pressure and fracture pressure. This paper presents integrated experimental and analytical solutions for wellbore strengthening due to mud cake plastering. Conducting experiments on rock core disks has provided more realistic results which can resemble to field conditions. The experimental work here provides an insight to effect of mud cake build up at high pressure and high temperature conditions using a heterogeneous filtration medium prepared from different sandstone cores. Results were used in the analytical model to see the effect of stresses in the formation. The primary objective is to investigate the wellbore hoop stress changes due to formation of filter cake by mud plastering using the analytical models built upon the laboratory results. The models developed in this work provide insights to quantify on wellbore plastering effects by mud cake build up.

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Figures

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Fig. 1

Core disks made from sandstone slabs for high pressure and temperature filtration experiments in PPA

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Fig. 2

SEM images of sandstones before conducting PPA experiments

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Fig. 3

Cumulative filtrate loss with changing time for different core samples using base mud

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Fig. 4

Cumulative filtrate loss with changing time for Michigan core sample for mud having different types of additive

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Fig. 5

Mud cake permeability for different core samples for base design and wellbore strengthening design muds

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