| Fractured-vuggy reservoirs are widely distributed all around the world.The geological reserves of it are almost 50 percent of the world’s reserves.So,it’s worthy of being developed.At present,many countries have carried out systematic research on the development of fractured-vuggy reservoirs,but there are not an efficient development method,clear calculation method of development index and optimization method of development parameters.Thus,it’s meaningful to research the development method,the calculation method and the parameters’ optimization for scientifically efficiently developing fractured-vuggy reservoirs.Based on the Tahe oil field S48 unit,through the geological structure,we build the typical fractured-vuggy models.And combining the geological information,the development data with the research results of fluid flow principle in fractures and vugs,we summarize the single well’s and field’s dynamic features.Depending on Navier-Stokes equation,we can derive the equivalent permeability and then derive the development index from the Buckley-Leverett theory.Aiming at equilibrium displacement,scientific development and economical purpose,we simulate the development process of S48 unit to get the reasonable pressure difference,the optimal well spacing and some other parameters.Finally,we can build up a series of technology system.Through the research,we get the water cut equation,the oil decline equation,the water driving equation.Also,we deduce the oil production equation,the water production equation,the oil recovery equation under the constant flow rate and constant pressure condition.Using the numerical simulation software COMSOL and ECLIPSE,we get the reasonable parameters such as injection-production position,pressure difference,well spacing,economic ultimate water cut,gas injection rate,gas injection mode.Finally,we build up “down-in-up-out,fracture-in-vug-out,little vug-in-big vug-out” mode,which is spatial development system. |
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