The Study And Test Of Thermal Recovery Feasibility In Fuyu Oilfield

The main methods of thermal recovery of heavy oil reservoirs currently include cyclic steam stimulation, steam flooding, fire reservoir, water flooding, etc. The main principle is that they use crude oil viscosity on temperature with high sensitivity. With crude oil where the ambient temperature, the viscosity will be greatly reduced. And the greater the viscosity of the oil phase, this decline more significant. Crude liquidity improved, so that in the formation of heavy oil under the existing technical conditions to be taken out. This topic mainly water vapor thermodynamic principles by studying the results of research related to thermodynamics researchers to compare and analyze relevant research results and Fuyu oilfield real difference. According to the guidance of the field test physical simulation and numerical simulation results. Combined with the results of laboratory experiments and field tests evaluate the feasibility of thermal recovery of Fuyu oilfield.This paper analyzes the T91 exploration blocks Fuyu oilfield reservoir structural characteristics, reservoir characteristics, formation fluid characteristics. And on this basis, in-depth analysis of the formation of remaining oil distribution. On the basis of geological research on three-dimensional geological modeling, geological model, waterflood production history matching dynamic distribution test area remaining oil isochronous. From the vertical perspective, in the conventional waterflooding process, due to differences in water density gravity formed differentiation, so that the lower portion of the injected water is easy to drive crude oil for the oil layer. So that in the end time simulation history matching, the lower part of the reservoir remaining oil relatively barren, while the upper part of the crude oil with less passive. From the lateral view, between the well network is relatively poor degree of control over parts of the well, and the remaining oil relatively rich. Well degree of control over the area is relatively good, relatively few remaining oil. In addition, the place in the vicinity of the fault and network edge or imperfect is remaining oil-rich areas.For T91 blocks, carried out in indoor static reservoir fine description of research, quantitative research the remaining oil distribution, reservoir oil viscosity characteristics Rethinking, water damage research injection, steam soak injury research, study thermal properties of reservoir rock seepage physical characteristics of oil displacement efficiency experiment. Field tests have been implemented 289 steam stimulation, improve the overall development level of heavy oil area. Block oil production, oil production rate increased significantly, a significant decline in water. During the test period, the cumulative fluid production 1150t- 2000 t, daily oil production 140t- 500 t, the moisture content of 92%---75%, oil production rate of 0.5%--- 2.5%. On the basis of tests carried out on the group gas injection. The results showed that the total amount of 64 steam injection production wells 76100 square, the average single well steam injection 1200 square steam injection intensity average 65 square / meter. The actual number of days of production statistics, 54 pumping wells cumulative actual production 3154 days, the cumulative oil production 6,022 tons, 4,027 tons of crude cumulative increase, the average single well increasing oil 74.6t, the average single well daily oil production 1.9t, average moisture content of 81.6%, which achieved good results.