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Paper
Title

Calculating the drilling mud weight window and geomechanical properties of Darian limestone formation in Reshadat oil field

Year: 1395
COI: JR_JGEO-12-1_003
Language: EnglishView: 257
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Authors

Naser Ebadati - Department of Geology, Islamic Azad University, Islamshahr Branch, Iran
Mohammad Najari - Islamic Azad University, Science And Research Branch, Tehran, Iran

Abstract:

In the oil province of southern Iran like other hydrocarbon zones, thorough understanding and risk management resulting from the rock mass deformation, can be of great help in executing operational processes such as the stabilization of the borehole wall, controlling the sand production in the borehole and hydraulic fracture. In oil well excavation operations, determining maximum and minimum horizontal stresses helps in designing the excavation route in the minimum stress direction so that collapsing of the borehole wall and drilling tube blockage against the rocks is avoided. The aim of this study was removing the main excavation problems especially of the diversion wells through exact geomechanical calculations in the Darian lime formation depth range in the understudy field. In order to develop the geomechanical model, first the bulk, the shear and the Young s modules, the Poisson coefficient and Vp/Vs ratio were calculated using the visual log data integrated with the geomechanical parameters, and the strength parameters like uniaxial compressive strength, internal friction coefficient and tensile strengths and static modulus of elasticity were determined and then the determination of direction and min/max horizontal stresses alongside the formation thickness were studied. In the end by the assessment of the geomechanical model and calculating the mud weight during drilling of the understudy well, and using the STAB View software output, the mud weight window of 80-120 PCF and the drilling Azimuth range of 30°- 45° was recommended for the prevention of borehole wall collapse for Darian formation.

Keywords:

Darian formation , drilling azimuth. Reshadat oil field

Paper COI Code

This Paper COI Code is JR_JGEO-12-1_003. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/705358/

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Ebadati, Naser and Najari, Mohammad,1395, Calculating the drilling mud weight window and geomechanical properties of Darian limestone formation in Reshadat oil field,https://civilica.com/doc/705358

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Type of center: Azad University
Paper count: 2,849
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