Estimation of hydraulic fracturing risks, performed in wells for a set of the zenith angle values of a wellbore based on the statistical analysis
UDC: 622.276.66:519.24
DOI: 10.33285/0207-2351-2022-2(638)-31-36
Authors:
FATTAKHOV IRIK G.
1,2,
KOCHETKOV ALEXANDER V.1,
STEPANOVA RAZIFA R.2,
GALIULLINA IRIDA F.2
1 Tatneft, Almetyevsk, Republic of Tatarstan, Russia
2 Ufa State Petroleum Technology University, Oktyabrsky, Republic of Bashkortostan, Russia
Keywords: hydraulic fracturing, hydraulic fracturing of terrigenous reservoirs, fracturing complications, fracturing risks, fracturing planning, well zenith angle, friction pressure losses, fracture tortuosity, statistical analysis, Cramer – Mizes – Smirnov criterion, Spearman correlation, Wilcoxon – Mann – Whitney test, JASP
Annotation:
The purpose of this work is to evaluate the effect of a wellbore zenith angle in the perforation interval on the complications which may occur during conducting hydraulic fracturing of a formation. The factor of the zenith angle value in the perforation interval is taken into account when planning hydraulic fracturing, but the published scientific articles contain no information about confirmed and measured influence of the zenith angle on the probability of technological complications during conducting hydraulic fracturing of a formation.
The scientific novelty of the work lies in the assessment of the assumed negative effect by means of statistical analysis of actually measured data. For the first time, the Spearman and Wilcoxon – Mann – Whitney correlation methods were applied to estimate the influence of the well's zenith angle on the hydraulic fracturing process. As a result, the dependence of the zenith angle and friction pressure losses were confirmed as well as the effect value was measured and recommendations for selecting wells for hydraulic fracturing were formulated.
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