tailieunhanh - Geostatistics application in spatial analysis of geomechanical properties

This research presents geomecanical propertiesfor two offset wells according to experiment relations existing. Then, variogramand spatial continuity will be analyzed. The OrdinaryKriging (OK) methods will be used to interpolatethe properties in the cross section between two offset wells and then for a planned well. | Tạp chí Phát triển Khoa học và Công nghệ, tập 20, số K4-2017 21 Geostatistics application in spatial analysis of geomechanical properties Ta Quoc Dung, Vu Duc Thinh Abstract—Geomechanics applications play an important role in both drilling and production of oil and gas field. There are many important properties such as Unconfined compression strength (UCS), Poison ratio (PR), Internal Friction Coefficient (IF) and Porosity (PHIE) need to be estimated properly. To estimate these properties, there are many methods that can be used but geostatistics has more advantages. This research presents geomecanical propertiesfor two offset wells according to experiment relations existing. Then, variogramand spatial continuity will be analyzed. The OrdinaryKriging (OK) methods will be used to interpolatethe properties in the cross section between two offset wells and then for a planned well. The predicted properties were compared with the actual measured data to find the linear correlation coefficient. Most of these values arenearly 1. As a result, the quality of the modelbuilt could be practically accurate and reliable to predict geomechanical properties for planned wells used in wellbore stability, sanding studies. Index Terms—Geostatistics, Variogram, Kriging, Geomechanics Model, WellboreStability. 1 INTRODUCTION T he better understanding and demand of accurate geomechanicial properties are vital for wellbore stability analysis, sand control and other geomechanics applications. These properties are primarily calculatedbased on petrophysical data, then calibrated where possible against limited Manuscript Received on August 7th, 2017. Manuscript Revised December 25th, 2017 This research is funded by Ho Chi Minh City University of Technology – VNU-HCM, under grant number C2017-20-25. Ta Quoc Dung - Faculty of Geology and Petroleum Engineering, Ho Chi Minh city University of Technology – VNU-HCM (e-mail: tqdung@). Vu Duc Thinh - Faculty of Geology and .