Fracturing how to judge whether the reservoir formation of cracks?

Changes according to the pressure and the displacement of the reservoir determine whether the formation of cracks:  Fracturing    with the rise in pressure, along with the increase in displacement between the two maintain a certain relationship between the ratio. But when the crack is formed, the ratio between them, the original relationship is broken. At this point, two situations may occur: First, the pump displacement pressure drop increase rapidly. Second, the pressure constant displacement rise. Then you can determine the reservoir has been pressure to open cracks.
Changes according to the mechanical equipment determine whether reservoir formation of cracks: no formation of cracks in the reservoir until the pressure is relatively high,  fracturing  car engine load, the sound is very heavy, exhaust smoke. Blender's Shaguan from where you can observe the liquid displacement little liquid inside Shaguan churn is also small. But once the crack formation, diesel would immediately change the sound, Shaguan liquid displacement in a sudden increase in the formation of large billowing waves. Then determine the reservoir has been pressure to open cracks.
Index changes using formation water reservoir determine whether the cracks are pressed open: in the formation of cracks is not formed, because of the formation itself filtration surface and the permeability is fixed, the water absorption index is a fixed value. When the oil is pushed open cracks, due to a new crack surface, so that the ability to increase the formation suction, suction index was significantly increased at this time to determine the reservoir pressure has been opened cracks.