Hydraulic Fracturing (horizontal Cracks) And Augmented Injection Effects Evaluation Research And Application

Hydraulic fracturing is used in all oilfields for increasing the injected water rate, all treatments operation must consider the economic profit. In this theses, numerical simulation and increase economic evaluation methods are adapted for anglicizing and evaluating water-injected by hydraulic fracturing.(1)As to reservoir and man-made fracture, with Material conservation equation, motion equation, equation of fluid flow through porous medium and assistant equation, in addition to solution equation, set up the integer fracture simulation model of 3-D and two phase in horizontal fracture. IMPES method was applied in this paper , and conjugate gradient method was also applied to solve the oil pressure equation, all these improved the precision and astringency of iterative.(2) Apply the increment of NPV to evaluate the effect of infusion. Firstly, calculate the cash increment of the alteration, then calculate the increment index, at last make the decision by the index.(3)Workout the effect evaluation system of infuse in water wells with the VC+, VB6.0,and office 97. including the reservoir simulation , data view and plot system, economic appraisal system. Its new functions are: ①fracture evaluate of water wells, ② calculation of multilayer production, so it is easy to compare the result with the real production data and to make the history matching.(4)Base on the Xinshugang oil-field, calculate several parameters and then analyse their effect to the exploitation indexes and economy indexes, these parameters including reservoir parameters, well type and well density, length of fracture, fracture transmit ability, time and so on.①The low penetrate ratio can get low oil extraction velocity and low degree of reserve recovery, so it is low income; but if the ratio is too high, the cost increase and oil increment decrease, economic benefit isn't very well. The ratio between 0.15 to 0.25 can make the best economic benefit.②the increase of early transmit ability and the slow attenuation of transmit ability, both can enhance the oil extraction velocity and ultimate recovery, so can get more income. That means the income is more than the cost of measurement of increase of early transmit ability.③The oil extraction velocity and ultimate recovery, the production increment after fractured of high permeability reservoirs, are higher than that of the low permeability reservoirs, so the income of high reservoirs are more distinctive. But in the multilayer...