Abstract

SANCHEZ ARREDONDO, LUIS HERNÁN; MIRANDA RAMOS, CARLOS DAVID  and  VALLEJO DIAZ, VÍCTOR JÚNIOR. CHARACTERIZATION GEOSTATISTIC OF STRESS IN A PETROLEUM FIELD: CASE STUDY CUPIAGUA FIELD, COLOMBIA. Dyna rev.fac.nac.minas [online]. 2011, vol.78, n.167, pp.96-102. ISSN 0012-7353.

The objective of this work is the estimation of azimuth of the horizontal minimum stress (AHMS) in the North zone of the Cupiagua field, located in the Piedemonte Llanero, using like fundamental tool the geostatistics. The methodology for the data’s treatment consisted of the conversion of the azimuthal values (circular variable) to numeric data by means of the sine function with the purpose to avoid incompatibilities in the error’s measurement. The geostatístics analysis showed that the space variability of the data is concurrent with an effect nugget of 0, 0017 plus an exponential model with equal sill to 0, 0087 and an influence range of 7874 feet. The direction of the AHMS, considered by the ordinary block kriging method, indicated that values AHMS vary between 11º- 65º, with a value average of 34º, where as the estimation error varies between 2° and 7°. The obtained results allowed differentiating two fields from direction of different horizontal minimum stress: one to the north, where the AHMS tends to values inferior to 40º and they represent 75% of the calculated data; where as 25% of the remaining data surpass the values obtained in the north, probably had to a greater structural complexity of the zone.

Keywords : Geostatistics; Azimuth; Oil Field; Horizontal Minimum Stress.

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