SAGD Productivity Prediction Model Considering the Injector-Producer Pressure Difference

doi:10.11885/j.issn.1674-5086.2016.02.01.02

Abstract

Abstract: In addition to gravity drainage in the Steam Assisted Gravity Drainage (SAGD) production process, the existence of injector-producer pressure difference also significantly affects oil production. Therefore, using the Butler method for forecasting productivity can easily lead to errors. This study investigates the effect of injector-producer pressure difference on SAGD productivity. A double horizontal well is established as a prediction model of the SAGD productivity, and the mathematical model is solved. The following results were obtained:(1) The results of the SAGD numerical simulation calculation program show that the injector-producer pressure difference has a certain effect on the SAGD productivity. (2) The oil recovery effect will be better if there is a certain injector-producer pressure difference in the SAGD recovery process. However, a higher injector-producer pressure difference is not preferable. Because steam channeling has a negative impact on production when the injector-producer pressure difference is greater than the critical pressure value of steam channeling, there is an optimal value of injector-producer pressure difference. (3) The existence of the injector-producer pressure difference increases the oil recovery rate and reduces the time required by the steam to reach the top of the oil reservoir. With the increase in the injector-producer pressure difference, the rate of increase in the magnitude of oil recovery rate and the rate of decrease in the time required for the steam to reach the top of the reservoir decreases gradually.

Key words: heavy oil, SAGD, injector-producer pressure difference, productivity prediction

CLC Number:

TE357.44

HUANG Shijun, XIONG Hao, YE Heng, GU Hao, YANG Yang. SAGD Productivity Prediction Model Considering the Injector-Producer Pressure Difference[J]. 西南石油大学学报(自然科学版), 2017, 39(6): 101-108.

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