Research On Economic Evaluation In Shu2 Bailing Well Test Area

When confirming a suitable period of bailing well, a mathematical formula which could predict precisely the relation between production and time should be chosen at first. Nowadays, Daqing Oilfield always adopts the empirical formula to calculate. Although this method is comparatively accurate, it has some disadvantages because of its need of much well logging analysis and its disability of predicting the yield. So this research applies the conformal transformation to derive the formula of predicting the yield of vertically fractured well and calculate the relationship between the yield of low-permeability fracturing wells and time. Applying this method, the suitable period of bailing well can be predicted without the well logging analysis. Also, this article gives the index, power and harmonic methods.Applying the mathematical formula above, predict the declining rate of water-injection mechanism, water-injection bailing, mechanical extracting without injection and bailing without injection according to the change rule of yield. According to economic evaluation, confirm the ultimate yield of mechanical wells and bailing wells and the yield border of mechanical wells turning into bailing wells under different oil prices. Applying the economic ultimate yield method, evaluate five development patterns of water-injection mechanical extracting, water-injection bailing, mechanical extracting without injection, bailing without injection and mechanical extracting without injection turning into bailing, then provide the net income indicators and confirm the suitable development pattern.Taking oil layer thickness, controllable reserves per well, well spacing and economic indexes such as various oil prices, discount rate into account, determine the boundary value of initial flow and controllable reserves per well and the ultimate well spacing density, and calculate the total income of the bailing test area.