Stress Ratio Method to Predict Fracture Pressure Gradient in Southern Iraqi Deep Wells | ||
| Journal of Petroleum Research & Studies | ||
| Article 1, Volume 212, Issue 6, December 2012, Pages 1-18 | ||
| Authors | ||
| ; Nagham Jasim Al | ||
| Abstract | ||
| This research presents a method for calculating stress ratio to predict fracture pressure gradient. It also, describes a correlation and list ideas about this correlation. Using the data collected from four wells, which are the deepest in southern Iraqi oil fields (3000 to 6000) m and belonged to four oil fields. These wells are passing through the following formations: Y, Su, G, N, Sa, Al, M, Ad, and B. A correlation method was applied to calculate fracture pressure gradient immediately in terms of both overburden and pore pressure gradient with an accurate results. Based on the results of our previous research , the data were used to calculate and plot the effective stresses. Many equations relating horizontal effective stress and vertical effective stress are obtained for each well and used to calculate fracture pressure gradient. Similar equations are found for group of formations that calculate fracture pressure gradient and to find the most accurate correlation among them. | ||
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