Reservoir hydraulic fracturing What is the rationale?

hydraulic fracturing oil generally refers to the principle of the liquid pressure transmission in the ground with a large displacement high pressure pump, the liquid has a viscosity greater than the capacity of the reservoir can be absorbed into the reservoir, the wellbore pressure is gradually increased, when the pressure increased to more than the required oil pressure rupture, oil will form one or several horizontal or vertical cracks. When the crack formation later, with the continuous injection of the liquid, the crack will continue to extend and expand until the liquid injection rate and reservoir can absorb the same speed, at which time the cancellation of external cracks will re-close.
In order to maintain the fracture in an open state, at the same time with the fracturing fluid into the mixing certain proportion of solid particles having a higher strength to support the  Proppant  fractures do. Since the support is to undergo a rigorous screening, it has good size and strength, precipitation in the cracks, so that changes the near wellbore formation conductivity, thereby reducing the liquid flow into the wellbore from the formation of resistance.
Reservoir through  Hydraulic fracturing  after the formation of cracks, can generally be grouped into two basic types, namely, horizontal cracks and vertical cracks. Face parallel with the oil layers called horizontal fracture cracks, vertical surface with the oil layers called vertical fracture cracks. Hydraulic oil reservoir fracturing purpose is to change the physical structure of the oil layer is formed artificially high penetration ability of one or several channels, to reduce the flow resistance near wellbore, increasing the flow capacity of the wells to obtain yield.