ORCID Profile
0000-0001-5169-6894
Current Organisations
Edith Cowan University
,
National Iranian Oil Company
,
University of Adelaide
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Publisher: American Chemical Society (ACS)
Date: 21-01-2022
Publisher: Elsevier BV
Date: 07-2017
Publisher: Society of Exploration Geophysicists
Date: 07-2014
Abstract: The uniaxial compressive strength of rock ([Formula: see text]) is an important parameter for petroleum engineers, drilling operations, and all related activities from exploration through to production and abandonment. A thorough understanding of the parameters affecting [Formula: see text] is a basic prerequisite for accurate geomechanical modeling of the reservoir and overburden properties. Uniaxial compressive strength plays a significant role in mud weight determination while drilling, especially for a troublesome lithology such as shale. However, standard geomechanical practice requires well-preserved core s les for measurement of [Formula: see text] in the lab. Because core s les are not often available, there is a need for alternative methods to obtain fit-for-purpose values of [Formula: see text], based on other related rock parameters. Our primary objective was to identify a minimum set of related rock properties that could be used to predict [Formula: see text]. From a review of existing data in the literature, supplemented by laboratory measurements on Iranian s les, we established a database and accomplished extensive statistic analysis. Also, a normality test was executed to make sure a statistically acceptable set of data was collected. We suggested that two parameters of Young’s modulus ([Formula: see text]) and porosity ([Formula: see text]), which might be estimated from geophysical log data, were sufficient for a reliable prediction of [Formula: see text] in shale formations, and the overall contribution of [Formula: see text] was more than [Formula: see text]. We obtained a prediction equation with improved accuracy compared to previous investigations. Furthermore, we determined that the relative sensitivity of shale strength to porosity and Young’s modulus very much depended on the range of porosity.
Publisher: Elsevier BV
Date: 08-2017
Publisher: American Chemical Society (ACS)
Date: 20-10-2021
Publisher: SPE
Date: 24-01-2010
DOI: 10.2118/131986-MS
Abstract: Dalan and Kangan formations are the most important host gas reservoirs in Iran. These geological formations are extended to other regions, and they are famous as Khuff formation in the Middle East. They are mainly composed of limestone and dolomite with some inter-beds of shale. So far many reservoirs in Iran are hosted by Asmari carbonate formation. However, acidizing in other hydrocarbon formations (Asmari formation) is accomplished similarly. Conventional acidizing operations were performed on Dalan and Kangan formations in one of the gas fields in south of Iran. Substantial reduction of produced gas was observed over a short period of time. For this reason a comprehensive engineering geological site investigation was accomplished to explain the symptoms and avoid possible further deterioration. Connate water s les from the well while production, showed some unexpected results. Different chokes were tested to see if the amount of impurities in the s le would change. To reduce the amount of water accompanied with produced gas, a different choke was selected but the result was not satisfactory enough based on refinery report. Therefore, the geological features of the well were gathered based on well sketch and logging data. The phase equilibrium of the reservoir rock before and after acidizing was simulated using a software. The results of chemical lab were analyzed to check the kind of the salts in the well. Laboratory chemical experiments were accomplished to explore produced salts in the well. Further investigation revealed that the choke size was not suitable, and inappropriate acidizing could deteriorate the situation. Based on this research, a number of recommendations were suggested to improve the circumstances of production rate. The authors suggested more carefully designed techniques of acidizing to be applied. The results of this research may be used to prevent geomechanical destabilization around the wellbore in similar cases.
No related grants have been discovered for Mohsen Farrokhrouz.