Research On Influence Factors Of Steam Flood In Block Ⅱ 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 water flooding and steam flooding, 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 reservoir parameters of successive steam flooding and water flooding with permeability, oil viscosity, net/gross ratio and the operation conditions with injection steam intensity, well spacing, and fracture orientation for low permeability fracture reservoir are studied, the influence laws on successive steam flooding are contrasted and analysized and production results are evaluated according to numerical simulation results. Combined with low permeability light oil reservoirs steam flooding experiences home and abroad, make a comparison between steam flooding and water flooding mainly from recovery percent increment value and increasing production gas oil ratio, screen reservoir parameters such as permeability, oil viscosity, net/gross ratio for steam flooding. Based on this, to ensure good steam flooding development effect, optimize operation conditions; Optimize to the deploying of well and fracture orientation. The numerical simulation results indicate that steam flooding is an effective complement to water flooding, through increasing recoverable reserves, low permeability reservoir steam flooding can reduce residual oil saturation, enhance oil recovery, and the results can be very effective. The reservoir parameters limits for water flooding being converted to steam flooding in second type of blocks of Chao Yanggou oil field are given, which can be used for coarse filtration suitable for steam flooding reservoir; By making use of economic evaluation, injection steam intensity is optimized, and rational spacing between wells and fractuer direction are fixed, which provides a set of scientific and comprehensive selection criteria for steam flooding after water flooding in second type of blocks of Chao Yanggou oil field and the homogeneous oil field, and lays the theory foundation for the scale use of steam flooding in low permeability light oil field.