朝陽溝低滲透油田采收率計算方法研究
[Abstract]:In recent years, one of the main scientific research and field tests in Chaoyang Gou Oilfield is to improve oil recovery and increase recoverable reserves, so enhanced recovery technology is the main content of scientific research in Chaoyang Gou Oilfield. However, at present, all kinds of formulas for calculating oil recovery are not suitable for low permeability and ultra low permeability oilfields. Because these formulas do not take into account the influence of effective driving system, sand body connection mode, connection direction and other conditions on recovery, the calculated recovery is quite different from the actual development situation, especially for the three types of blocks where effective driving system can not be established at 300m well spacing. For example, in Chao2 East Block, the average recovery calculated by various methods is 14.8%, but in fact, all the wells in this block have been closed at present, and the recovery degree is only 2.0%, which is too different from the calculated recovery rate value. Therefore, the oil recovery calculation method suitable for low permeability and ultra low permeability oil fields has been developed in this paper. In this study, the maximum water drive recovery in the first, second and third blocks of Chaoyang Gou Oilfield is calculated by using the experimental data, the problems existing in the calculation of water drive recovery in low permeability oil fields by various displacement law curves are evaluated, and the calculation method of water drive recovery considering effective driving system is put forward. This method takes into account the relationship between water drive control degree and well spacing, injection-production well number ratio and sand body size, and puts forward an effective driving coefficient calculation method. On this basis, the displacement efficiency of well pattern and fracture in Chaoyang Gou Oilfield is calculated by using numerical simulation method, and the reservoir heterogeneity and different relative permeability curves are corrected. Finally, a comprehensive calculation method of oil recovery suitable for Chaoyang Gou low permeability oil field is put forward.
【學位授予單位】:東北石油大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TE327
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