چکیده

Analysis and prediction of well wall instability is one of the critical points in drilling operations and one of the most important and serious problems in the oil and gas well drilling industry. One of the important solutions to deal with this problem is to determine a safe mud window for Drilling a well. The aim of this study was to determine the safe mud window and estimate the optimal drilling mud pressure by estimating the shear and tensile fracture pressure for stability in one of the wells in the oil fields of southern Iran. In this regard in order to calculate the lower limit of safe flower window using FLAC2D software he modeled drilling oil wells at different mud pressures which after drawing the NYZA diagram against different mud pressures was considered as the shear failure threshold. That this amount of pressure was set as the lower limit of mud weight. In order to calculate the upper limit of the mud window numerical modeling of oil wells was performed using ABAQUS software in which the drilling mud pressure was gradually increased Due to the increase in crack length in the well wall finally the pressure at which the well wall was on the verge of tensile failure was considered as the upper limit of mud weight. Finally the lower limit of safe flower window was 21.75 MPa and the upper limit of safe flower window was 65.93 MPa and the optimal drilling mud pressure was selected as the median between the lower limit and the upper limit of safe flower window of 43.84 MPa.

کليدواژه ها

پنجره ایمن گل حفاری،فشار بهینه گل حفاری، پایداری چاه،شکست برشی، شکست کششی

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ناصر بهنام , 1401 , تعیین پنجره گل ایمن و تخمین فشار بهینه گل حفاری با استفاده از تخمین فشار شکست برشی و کششی در یکی از چاه‌های میادین نفت خیز جنوب ایران , هشمین کنفرانس مکانیک سنگ ایران