Production Prediction for the Volume-Fracturing Horizontal Wells of a Tight Oil Reservoir in the Ordos Basin

doi:10.11885/j.issn.1674-5086.2017.03.29.05

Abstract

Abstract: The methods currently available for horizontal-well production prediction, whether by numerical simulation or theoretical analysis, are not appropriate for tight oil reservoirs because of their large heterogeneous variations, difficulties in describing their artificial fracture development, etc. To resolve these issues, the production of the horizontal wells of a tight oil reservoir was analyzed from geological and engineering perspectives on the basis of interpreting log data and volume fracturing parameters. The analysis was conducted using the geological parameters of the horizontal section (total hydrocarbon value obtained through standard mud logging, permeability, and brittleness index) as well as the enveloping surface area and lateral heterogeneity index of the oil reservoir as the sensitivity parameters of oil content, permeability, compressibility, and heterogeneity of the oil reservoir. In addition, the quantity of fluid injected into a single well was used as the sensitivity parameter of the well production through gray correlation analysis. The effectiveness of this analysis was then assessed. A fitted-regression-based log model was developed for predicting the production of the horizontal wells of the tight oil reservoir, thereby helping to mitigate the investment risk of large-scale tight oil reservoir development and increasing production efficiency. The method was then applied to six horizontal wells of the tight oil reservoir located in the Ordos Basin. The difference between the predicted and actual production was only 8.0%, thereby demonstrating the effectiveness of the method.

Key words: tight oil, volume fracturing, horizontal well, production prediction, sensitivity parameter

CLC Number:

TE348

WANG Chong, QU Xuefeng, WANG Yongkang, CHEN Daixin, ZHAO Guoxi. Production Prediction for the Volume-Fracturing Horizontal Wells of a Tight Oil Reservoir in the Ordos Basin[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 123-131.

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