Paper Information

Title: 

THREE DIMENSIONAL MODELING FOR WELLBORE STABILITY ANALYSIS AND GENERAL BEHAVIOR OF OIL WELLS

Type: PAPER
Author(s): VALIZADEH AYUB*
 
 *PETROLEUM UNIVERSITY OF TECHNOLOGY
 
Name of Seminar: INTERNATIONAL CONFERENCE OIL, GAS, PETROCHEMICAL AND POWER PLANT
Type of Seminar:  CONFERENCE
Sponsor:  SHERKATE TAVONI AMOZESHI PAZHOHESHI VESTA
Date:  2012Volume 1
 
 
Abstract: 

WELLBORE INSTABILITY IS BECOMING A MAJOR CONCERN DUE TO INCREASING THE NUMBER OF DIRECTIONAL WELLS, DEEP FORMATIONS AND NATURALLY FRACTURED MEDIA. AN APPROPRIATE WELLBORE STABILITY MODEL IS DESIRED TO CORRECTLY CALCULATE THE STRESSES AROUND THE WELLBORE AND PREDICT A REASONABLE SAFE WELLBORE PRESSURE.
ANALYTICAL SOLUTIONS FOR WELLBORE STABILITY STUDY ARE MAINLY EASY TO USE BUT IN SOME CASES ARE TIME CONSUMING. THUS, NUMERICAL METHODS, INCLUDING FINITE DIFFERENCE AND OR FINITE ELEMENT HAVE BEEN APPLIED TO MODEL WELLBORE STABILITY.
IN THIS PAPER, A FINITE DIFFERENCE CODE WAS USED IN ANALYZE THE MECHANICAL TO DETERMINE THE OPTIMUM MUD PRESSURES AND THE BEST WELL TRAJECTORIES FOR DIFFERENT WELLBORE INCLINATIONS, AZIMUTH ANGLES AND IN-SITU STRESS REGIMES. THE RESULTS INDICATED THAT IN NORMAL FAULT STRESS REGIME, THE STABILITY IN DIRECTION PARALLEL TO THE MINIMUM HORIZONTAL STRESS WAS MORE THAN THE OTHERS. FURTHERMORE, VERTICAL WELL WAS MORE STABLE THAN THE HORIZONTAL ONE IN THIS CASE. BUT IN STRIKE SLIP AND REVERSE FAULT STRESS REGIMES, THE DIRECTION OF MAXIMUM HORIZONTAL STRESS WAS THE BEST DRILLING DIRECTION AND IN THE CASE OF STRIKE SLIP STRESS REGIME, THE HIGHER DEVIATED BOREHOLES WERE MORE STABLE.

 
Keyword(s): 
 
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