Drilling Water Injection Pressure Impulses Crack Gas Drainage Technology Research

This reference voltage electric pulse applied to the maturity of oil on the theory and successful experience, based on the existing basis of gas drainage technology will be applied to gas drainage drilling water injection technology and the high voltage pulse applied to oil exploration technique a combination of new gas extraction method --high voltage pulse fracturing and drilling water injection gas drainage method.This method combines the application of gas drainage drilling water injection and oil production of high-voltage pulse applied to hydraulic fracturing technology, the latter of which is the focus of this article. Paper first introduced the fluid pulse discharge physical phenomena and hydraulic discharge regularity of shape, affecting the fluid determine the effect of discharge forming the main discharge parameters, given the high voltage pulse discharge fracturing mechanism to explain the high-voltage pulse technology used in the feasibility of gas drainageFurthermore, this article from the fracture and damage mechanics point of view, to determine rock fracture mechanics crack growth model to analyze the dynamic loading of rock into a closed fracture mechanism of injury, the establishment of a dynamic load pulse from the crack during crack extension and crack arrest criterion. On the high voltage pulse needed to drive through water the special requirements of medium given shock pressure in water transmission schedule features the process of bubble motion in water and the water shock wave front of the main parameters of the drilling water injection high voltage pulse fracturing process guidance.With LS-DYNA and ANSYA , rocks under hydrostatic pressure on the deformation and crack extension and crack filling cracks under dynamic pulse load to simulate the bifurcation and extended to compare the effect of hydrostatic pressure and water injection drilling of rock under dynamic pulse load different deformation and crack growth mode, verify the dynamic pulse load drilling water injection has obvious cracks in the rock bifurcation trend. Similar simulation experiments on the dynamic pulse of water in the transmission medium and transmission medium under the conditions of water damage on the Rock compared the effects, reflecting the dynamic pulse load of drilling water injection well fracturing of rock effect, and further verified the feasibility of the proposed topic.In short, high voltage pulse fracturing and drilling water injection is a convenient and effective way to improve coal permeability. It not only can produce messy seam micro-cracks and layer pieces through the crack, and its on-site construction by the geological conditions, construction environment and weather conditions and other factors have little effect, while it is also a green, environmentally friendly and efficient gas extraction method has tremendous potential to promote the use.