Oil & Gas Geology ›› 2021, Vol. 42 ›› Issue (5): 1181-1188.doi: 10.11743/ogg20210515

• Methods and Technologies • Previous Articles     Next Articles

FSV estimation and its application to development of shale oil via volume fracturing in the Ordos Basin

Fangzheng Jiao()   

  1. China National Petroleum Corporation, Beijing 100007, China
  • Received:2020-12-24 Online:2021-10-28 Published:2021-10-26

Abstract:

Qingcheng oilfield in the Ordos Basin is the first shale oilfield with over one-billion tons of reserves discovered in China.Volume fracturing of horizontal well is a key technology for effective development of shale oil in the oilfield.In this study, a fracture network swept volume (FSV) model for volume fracturing is built, the relation between key geologic and engineering parameters and microseismic coverage volume is established by multivariate linear regression, actual production data are applied to correct the relation to get an empirical formula for quantitative calculation of FSV, and then the correlation template between FSV and productivity is plotted to guide the optimization of engineering parameters of volume fracturing.The results show that fractures created during the volume fracturing of shale oil reservoirs appear as a stripped fracture network dominated by main fractures together with branch fractures in the shape of cactus; and the main factors affecting FSV include fracturing fluid volume, fracture density, pumping rate, oil layer thickness, and proppant load.Field practices prove that the empirical formula and correlation template proposed in the study can predict FSV with accuracy and provide scientific basis for design optimization and effect evaluation of volume fracturing of horizontal shale oil well in Qingcheng oilfield.

Key words: dense cluster spacing, FSV, horizontal well, development via volume fracturing, shale oil, Yanchang Formation, Qingcheng oilfield, Ordos Basin

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