Theoretical basis of frac width increasing for the Achimov tight-oil reserves

Abstract

Introduction. The main technology for developing Achimov tight-oil reserves of the YNAO is hydraulic fracturing. Increasing the single frac stage efficiency requires a detailed processes consideration and a traditional templates abandonment.
Aim. Theoretical basis and the influence assessment of the frac width on the proppant crash and well productivity.
Materials and methods. The significant difference between the simulated conditions and the actual fracture geometry was determined by reviewing the approved methodology for studying proppant crash, which leads to a distortion in decision-making for design fracturing. A physical model of a discrete system is considered to assess the load distribution along the proppant pack depth.
Results. Only the first three layers of proppant are subjected to full external load in a laboratory study. The lower layer experiences a load 33 % lower than the simulated one, which distorts the understanding of proppant crash processes in a real fracturing. These findings were used to formulate a program of modified laboratory studies.
Conclusion. Approved fracture investigation techniques are only applicable to comparing different proppants among themselves, but quantitative results cannot be used in hydraulic fracturing design without adjustment for the actual propped width.