Parameter Optimization And Numerical Simulation Of Carbon Dioxide Emptying Model In G104 Reservoir

G104reservoir is a typical small fault block reservoir of heavy oil, and the entire reservoir isolated strong, its area is small, and the porosity and permeability of the reservoir are very high, the oil layer of oil reservoirs is very thin, and the viscosity and density of the oil are very high, the relations between the oil and waters are very complex, the resistance of seepage flow is quite large, particularly the higher oil viscosity leads to the well’s low productivity, the well’s water cut ratio rises very fast, the production index of fluid and oil fell fast, stable production is very difficult, recovery of oil is very low, during the production process, reservoir expose a series of problems, in order to control the reservoir water cut ratio and enhanced oil recovery, G104reservoir decided to carry out horizontal well CO2Huff and Puff to increase oil and water control.CO2Huff and Puff technology and the theoretical study is quite mature, its oil field application is also more widely, it is one of the effective measures to improve oil recovery; but now CO2Huff and Puff just applied to light oil reservoirs, and the well’s type is also vertical well, the study of horizontal well CO2Huff and Puff for heavy oil reservoir is still relatively small. Based on the actual situation of G104reservoir, taking the fuzzy comprehensive evaluation method to evaluate the reservoir horizontal well CO2Huff and Puff enhancing oil recovery and controlling water cut ratio suitability, taking the numerical simulation method to analysis the sensitivity of craft parameters and reservoir parameter, taking the orthogonal test design method to screen out indoor three dimensional physical model’s best simulation experiment scheme, providing some basises and references for G104heavy oil reservoir. The main achievement and the understanding of this can be divided into the following several aspects:(1) Have evaluated the G104-5block’s4typical Wells’CO2Huff and Puff effect, and analyzes the reasons leading to the corresponding effect.(2) Using fuzzy comprehensive evaluation method, considering the reservoir’s characteristic, reservoir properties, fluid characteristics, development status and contains multiple factors, have evaluated the G104-5block and the block of32wells" suitability of CO2Huff and Puff, have screened out the suitable wells, have proposed the block and single well huff and puff suitability evaluation criteria.(3) Have completed the CO2Huff and Puff physical modeling similarity criterion is derived, identified several required3D physical modeling similarity criterion, have completed conversion from the oil field data such as injection speed, injection volume, soaking time to the indoor experimental data. (4) Have analyzed the sensitivity of technology parameters and formation parameters by using Eclipse numerical simulation, have designed several sets of experiments scheme by using orthogonal experimental design method, and have selected the optimal scheme from the several sets of experiment schemes by using the numerical optimization simulation method, at the same time, the sequence of effect of technology parameters on the effect of CO2huff and puff have been proposed,have proposed the reservoir parameters sensitivity interval of the CO2huff and puff, have presented the best combination of reservoir parameters.(5) Comparative analysis of the numerical simulation results and actual field stimulation effect, that the numerical model proposed in this paper is reliable, the experimental scheme is feasible, which provide reference and guidance for the development of G104.