塔河油田断溶体油藏气驱井组注气量计算方法

doi:10.7657/XJPG20200219

摘要/Abstract

摘要：

塔河油田断溶体油藏注氮气提高采收率开发效果显著,但尚没有针对塔河油田断溶体油藏合理注气量的确定方法。根据生产数据分析法,通过流量重整压力和物质平衡时间曲线的拟合,得到了塔河油田断溶体油藏气驱井组总动用储量;考虑塔河油田断溶体油藏井网特征,得到了线状井网气驱平面波及系数计算方法;根据地震能量体属性缝洞体三维分布,得到了考虑缝洞体空间展布的断溶体油藏气驱纵向动用程度。利用数值模拟方法对典型断溶体油藏进行模拟,明确了断溶体油藏合理注气量为剩余储量的0.75 PV;在得到断溶体油藏气驱井组总动用储量、注气前累计产油量、平面波及系数、纵向动用程度和合理注气量的基础下,建立了塔河油田断溶体油藏气驱井组合理注气量的计算方法。将该计算方法得到的合理注气量应用于塔河油田断溶体油藏注气现场,见效井产油量增加到未注气前的2.5倍。

关键词: 塔河油田, 断溶体油藏, 气驱井组, 合理注气量, 动用储量, 线状井网

Abstract:

Good development effects of nitrogen injection EOR technology have been achieved in the fault-karst reservoirs of Tahe oilfield, but there is no method to determine the reasonable gas injection volume especially for the reservoirs in the oilfield. Based on the production data analysis method and the matching of flow reforming pressure and material balance time curve, the total producing reserves of gas drive well groups in fault-karst reservoirs of Tahe oilfield is obtained. Considering the well pattern characteristics in the fault-karst reservoirs of Tahe oilfield, a method to calculate the plane sweep efficiency of gas drive in the linear well pattern is obtained. Based on the 3D fracture-cave body distribution in the fault-karst reservoirs, a method for calculating the vertical producing degree of gas drive in the fault-karst reservoirs is developed. Based on numerical simulation of the typical fault-karst reservoir, the reasonable gas injection volume is determined to be 0.75 PV of the remaining reserves. Based on the obtained total producing reserves, cumulative oil production before gas injection, plane sweep efficiency, vertical producing degree and reasonable gas injection volume of the gas drive well groups in the fault-karst reservoirs, a method to calculate the reasonable gas injection volume is established for the fault-karst reservoirs of Tahe oilfield. The reasonable gas injection volume obtained from the calculation method has been applied in the gas drive of the fault-karst carbonate reservoirs in Tahe oilfield and the oil production of the response producers can reach 2.5 times the production before gas injection.

Key words: Tahe oilfield, fault-karst reservoir, gas drive well group, reasonable gas injection volume, producing reserves, linear well pattern

中图分类号:

TE357.7

朱桂良. 塔河油田断溶体油藏气驱井组注气量计算方法[J]. 新疆石油地质, 2020, 41(2): 248-252.

ZHU Guiliang. A Method to Calculate Gas Injection Volume in Fault-Karst Carbonate Reservoirs of Tahe Oilfield[J]. Xinjiang Petroleum Geology, 2020, 41(2): 248-252.

图/表 5

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