摘要：Data Different hydraulic fracturing experiments were enhanced in unconsolidated sandstones to investigate the fundamental mechanisms controlling fracture propagation, and the published observations consider that the efficiency of the fracture initiation and growth on unconsolidated sandstones is about the injection rate, rheology of the fracture fluid, confining pressure, and the principal mechanism of propagation is shear failure. Because of that, in this research, a reference between laboratory studies and numerical simulation are conducted to delineate the influence of the mechanical properties in mechanism of failure on the fracture propagation in unconsolidated sandstones. The samples were prepared with different scales of quartz sand, illite, montmorillonite, and water were mixed according to the depth of typical unconsolidated sandstone reservoirs in the Bohai-China; the size of the samples is 100 mmxmm, while the permeability of the samples is either about 1000 mD. In this way, the injection of a polymer until saturation of the core sample was applied until it gave an accurate result on the mechanical properties, changing to UCS to unconsolidated sandstones 1.6 mPa, at 3.9 mPa to enhanced sandstones with resin, improving the propagation of the fracture and leading to study the mode of failure, the initiation, and extension of the fracture on this type of sandstones. The experimental results showed that the samples without resin were completely saturated by the fracturing fluid without evidence of fracture, while for unconsolidated sandstones with resin injection ratio 2:3, generated quasi-planar, single wing fractures when using a low flow rate, and high viscosity of the fracturing fluid, and branching fractures for high flow rate and high viscosity fluid; the principal mechanism of failure was shear failure and shear-enhanced failure into the radius of consolidation of the core samples, showing control in the direction of the fractures in a circular area of 14-18 mm, on the near-wellbore region. This research can provide that the mechanical properties as a function of the fluid leakoff can determine the orientation and propagation of the fracture, even when the unconsolidated sandstones were enhanced by chemical injection with a low injection rate, the fracture propagation just stopped when is crossing the radio of the enhanced unconsolidated sandstone, it is desired to provide greater knowledge to the mechanism of failure in unconsolidated reservoirs.
Copyright 2019 ARMA, American Rock Mechanics Association.

发表日期：2019-01-01

期刊分区（SCI为中科院分区）：无

收录情况：EI（工程索引）

发表期刊名称：53rd U.S. Rock Mechanics/Geomechanics Symposium

通讯作者：爱玲,周宝,兰威

第一作者：刘伟

论文类型：会议论文

论文概要：爱玲,刘伟,周宝,兰威，Laboratory study and numerical simulation of mechanism of failure on hydraulic fracturing in unconsolidated sandstones，53rd U.S. Rock Mechanics/Geomechanics Symposium，2019，

论文题目：Laboratory study and numerical simulation of mechanism of failure on hydraulic fracturing in unconsolidated sandstones