Numerical Simulation Research On Steam-flood In Experimental Area Of Chao Yanggou Oil Field

Based upon the wells'geologic informations sufficiently collected in steam-flood experimental area of Chao Yanggou oil field and combined with the digitized precipitation facies, the structural model and property model with porosity, permeability, oil saturation and effective thickness is established by using the three-dimensional geological modeling software of Petrel in this thesis. The module of STARS in the numerical simulation software of CMG is applied to match the development index in the period of waterflooding and steam driving, including the geological reserves, composite water cut, individual well water cut, degree of reserve recovery, pressure and so on. On the basis of meeting the accurate history matching, the steam-flood development plans are made according to the reservoir features of the steam-flood experimental area wich belongs the second type of blocks in Chao Yanggou oil field . In accordance with the results of numerical simulation, the fruitage of various development plans is compared and analyzed then the appropriate plan of steam flooding is determined, which provides the theory foundation for the scale use of steam-flood in the homogeneous oil field. Then, According to the geologic features of the first and third type of blocks in Chao Yanggou oil field, various development indexes of diffent displacement patterns in different formation with average permeability of 25×10-3μm2 and 5×10-3μm2 or the existing of fractures are respectively caculated. The results show that: with the result of the comparison of various plans'development indexes and economic evaluation, the optimal plan for the second kind block of Chao Yanggou oil firld is the alternation of one-year steam flooding and one-year warterflooding with two injection wells. The steam flooding is just applicable to the first and second type of blocks. In the experimental area, there is developed fracture in latitudinal direction with the permeability 5 to 20 times of matrix's, which has little effection on the development fruitage of steamflooding.