PREDICTION OF SIDETRACK WELLS PRODUCTIVITY INDEX (ON EXAMPLE OF THE UNVINSKOE FIELD)

Autor: Aleksandr A. Shcherbakov, Grigory P. Khizhnyak, Vladislav I. Galkin
Jazyk: ruština
Rok vydání: 2019
Předmět:
Zdroj: Известия Томского политехнического университета: Инжиниринг георесурсов, Vol 330, Iss 5, Pp 93-99 (2019)
Druh dokumentu: article
ISSN: 24131830
2500-1019
2413-1830
DOI: 10.18799/24131830/2019/5/272
Popis: Relevance. Many fields of the Solikamskaya depression of the Perm Krai are characterized by the final stage of development and have a high oil recovery rate, close to the project, high water cut, declining technical and economic production indicators. To achieve the project indicators at the fields, various methods of enhanced oil recovery are used. The analysis of their application shows that the greatest average increase in the initial oil production is achieved by sidetracking. When justifying the location of the sidetrack wellbore in the interval of the productive layer, one of the main indicators of further well performance is the initial oil productivity index of the well. The main aim of the research is to develop a methodology for predicting the oil productivity index for sidetracks, taking into account geological and technological characteristics of the object. Objects: Bobrikovskie terrigenous deposits of the Unvinskoye field of the Solikamskaya depression. Methods: correlation and regression analysis based on the data of geophysical and hydrodynamic well studies, reservoir properties, physical and chemical oil properties, as well as geological and technological indicators. Results. The developed method allows estimating the values of oil productivity index for sidetracks based on the results of geophysical and hydrodynamic well studies, reservoir properties, physical and chemical oil properties, as well as geological and technological indicators using step-by-step regression analysis and oil productivity data values division into classes based on its dependence on the coefficient of determination. It was established that for J≥10 values the technological indicators – zenith angle α of the sidetrack in the reservoir interval and the length Lb of the borehole in the reservoir – affect most of all the oil productivity, which indicates the possibility of controlling oil recovery by changing these parameters.
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