Borehole insitu stress stability analysis of RBS-9 field utilizing the inversion technique

Abstract

The main objective of this paper is to perform an insitu stress model and borehole stability evaluation of 9 wells with limited data available in the RBS-9 field. In this paper, the Inversion technique is utilized to perform an analysis of the insitu stresses around RBS-9 wells. The analyses of results are used together with data form each well to calculate fracture and collapse pressures for the wells. The Inversion technique was used to find the maximum and minimum horizontal stresses. The stresses were also found for the whole well and for the places around each casing shoe. The RBS-9 field stresses were found to be anisotropic. Gathering the insitu stress analysis with data form each well led to the calculation of fracture and collapse pressure for the wells. The fracturing pressure obtained from the model became unrealistically large for some wells, and too low for other wells. The cause for this may be data inconsistency due to collection from many different sources. Also, a geological uncertainty related to the faults and tectonic forces present represents a factor.