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The PDF file of this paper is in Russian. Traditionally most software tools for geosteering use the method of comparison of synthetic and actual well logs. The synthetic log is sampled from a two-dimensional reservoir model, which is built based on the log from the nearest (key) well. The actual logging of the horizontal well is compared with the synthetic log and the stratigraphic formation of the model is corrected until the best match of the synthetic and actual logs is obtained. Thus, the estimated stratigraphic position of the wellbore in the reservoir is determined, as well as the forecast of the reservoir structure. The paper presents a new approach to modeling of highly detailed geological sections of the reservoir along the given horizontal well. The sections are based on three-dimensional geophysical property model, which are simulated by means of spectral simulation method and use data from all surrounding wells. The "spectral" geological sections of the reservoir provide better estimations of the lithological uncertainty and complexity of reservoir and more reliably predict the distribution of geophysical properties in three-dimensional space. In order to evaluate the new method an experimental software prototype was developed and tested on real field cases. It was shown that spectral sections provide reliable estimations of real reservoir heterogeneity. Furthermore, comparison of real and synthetics well logs showed high degree of efficiency of the spectral method in geophysical property prognosis along drilled well. Another important feature of the new method is an ability to build geological sections for horizontal wells with large values of deviation from vertical. Currently these wells are geosteered based on section models build consequently on different key wells. This induces additional task of switching between key wells, which can be non-trivial, and causes violation of geological integrity of full cross-section. A real case of such horizontal well, for geosteering of which four different key wells had been used, was presented. The new method was demonstrated to be able to build models of sections preserving geological integrity and lacking the requirement to perform switching between key wells. Results presented in the paper prove the new method to have high potential in reduction of financial risks, increase the success of geological and technical actions, particularly passing the borehole through the reservoir with the best filtration properties and to achieve the maximum productivity of horizontal wells.
Development of integrated geomechanical modeling in Gazprom Neft PJSC (Russian)
Vashkevich, A. A. (Gazprom Neft PJSC, RF, Saint-Petersburg) | Zhuko, V. V. (Gazpromneft NTC LLC, RF, Saint-Petersburg) | Ovcharenko, Yu. V. (Gazpromneft NTC LLC, RF, Saint-Petersburg) | Bochkov, A. S. (Gazpromneft NTC LLC, RF, Saint-Petersburg) | Lukin, S. V. (Gazpromneft NTC LLC, RF, Saint-Petersburg)
The pdf file of this paper is in Russian. This article presents results of the development of integrated geomechanical modeling technology by means of the example of projects realized in Gazprom Neft. Current technological development along with transition to new sophisticated objects, require solutions which are based on multidisciplinary approaches to assessment of production uncertainty. Geomechanical modeling integrates geological data, data of geophysical surveys, seismic data in order to meet challenges at each stage of field life. As examples of successful implementation of Company's geomechanical projects are Palyanovskoye, Novoportovskoye, Vostochno-Messoyakhskoye, Tsarichanskoye, Vyingayakhinskoye, Zapadno-Salyimskoye oilfields. In particular, techniques of geomechanical modeling for conditions of the field Palyanovskoye have enabled to estimate drilling mud density, necessary for maintenance of well bore stability. Three-dimensional geomechanical models has enabled to define an arrangement of conducted faults leading to catastrophic absorption on the field Tsarichanskoye. Considering textural anisotropy and zones of abnormally high reservoir pressure enabled to optimize zones of initiation of hydraulic fracture and to avoid water breakthrough from overlying or underlying layers for the Vyngayakhinsky field. The fields of reorientation of tension predicted by geomechanical model for the field West Salym near tectonic violations and adjustment of an arrangement of hydraulic fracture enabled to estimate geometry and the direction of growth of the fracture, with the maximum scope of a productive interval. Experience of Gazprom Neft shows that geomechanical modeling is a necessary tool enabled to reduce costs at all stages of the field production. The geomechanical model constructed under a specific objective can reduce risks when drilling and conducting a trajectory of a well, to estimate potentially perspective zones for drilling and for stimulation, to solve problems of borehole stability.
- Europe > Russia > Volga Federal District > Orenburg Oblast (0.24)
- Asia > Russia > Ural Federal District > Khanty-Mansi Autonomous Okrug (0.24)