氮气泡沫调驱技术在新疆油田Y区块的适用性研究  

Applicability of Nitrogen Foam Profile Control and Flooding Technology inYReservoir of Xinjiang Oilfield

作　　者：王健[1] 黄伟豪 赵云海 张宇 王丹翎 张莉伟 WANG Jian;HUANGWeihao;ZHAO Yunhai;ZHANG Yu;WANG Danling;ZHANG Liwei(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,P R of China;Xinjiang Petroleum Company Limited,China National Aviation Fuel Group,Urumqi,Xinjiang 830013,P R of China;Engineering Technology Research Institute,Southwest Oil and Gas Field Company,PetroChina,Chengdu,Sichuan 610017,P R of China;Shenzhen Branch,CNOOC(China)Company Limited,Shenzhen,Guangdong 518054,P R of China;Engineering Technology Research Institute,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,P R of China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国航油集团新疆石油有限公司,新疆乌鲁木齐830000 [3]中国石油西南油气田公司工程技术研究院,四川成都610017 [4]中海石油(中国)有限公司深圳分公司,广东深圳518054 [5]中国石油新疆油田分公司工程技术研究院,新疆克拉玛依834000

出　　处：《油田化学》2022年第2期288-294,共7页Oilfield Chemistry

基　　金：国家科技重大专项“CO_(2)泡沫体系控制气窜关键技术研究”(项目编号2016ZX05016-001-003)。

摘　　要：针对新疆油田Y油藏的强非均质性特征以及开发剖面动用程度低、含水高的特点,筛选适合注入水配液的氮气泡沫体系配方,评价泡沫体系的油藏适应性、油藏温度压力条件下的性能和细菌对泡沫性能的影响,研究泡沫的流变性,开展物理模拟分析在不同渗透率级差下的驱油效果。结果表明,在油藏条件下,所筛选的氮气泡沫体系的起泡体积为530 mL,泡沫半衰期为167 min,综合指数为66382 mL·min,具有良好的油藏适应性;优选出的氮气泡沫体系表现出典型的剪切稀释性,并且稳泡剂的加入对泡沫体系的黏度有较为明显的提升,但不会对其在地层中的流动产生影响。在0.1~10 Hz的频率范围内,氮气泡沫的黏性模量均高于弹性模量(G''/G'>1),泡沫表现出较好的黏性行为,并具有一定的弹性行为。通过岩心流动实验看出,在水驱阶段,高渗透岩心的分流率随着级差的增大而增大,当渗透率级差为11.53时,低渗透岩心不能有效启动;在泡沫驱和后续水驱阶段,低渗透岩心的驱油效率随着渗透率级差的增大先增加后减小,在渗透率级差为8.67时,低渗岩心提高驱油效率达到最大,为44.97%。According to the strong heterogeneity characteristics of Y reservoir in Xinjiang oilfield and the characteristics of low production degree and high water cut in the development profile,the formula of nitrogen foam system suitable for water injection preparation was selected.The reservoir adaptability of the foam system,the performance of the reservoir under temperature and pressure and the influence of bacteria on the foam performance were evaluated,the rheology of the foam was studied,and the oil displacement effect under different permeability ratio was analyzed by physical simulation.The results showed that the foam volume of the selected nitrogen foam system was 530 mL,the foam half-life was 167 min,and the composite index was 66382 mL·min,which indicated that the nitrogen foam system had good reservoir adaptability.The nitrogen foam system exhibited typical shear thinning,and the addition of foam stabilizer could significantly increase the viscosity of the foam system,but it would not affect its flow in the formation.The viscosity modulus of nitrogen foam was higher than the elastic modulus(G''/G'>1)in the frequency range of 0.1—10 Hz,exhibiting good viscous behavior and a certain elastic behavior.It could be seen from the core flow experiment that the diversion rate of high-permeability cores increased with the increase of the permeability max-min ratio in the water flooding stage,and the low-permeability cores could not be started effectively when the permeability max-min ratio was 11.53.In the foam flooding and subsequent water flooding stages,the efficiency of the low-permeability cores first increased and then decreased with the increase of the permeability max-min ratio.When the permeability max-min ratio was 8.67,the oil displacement efficiency of the low-permeability cores was increased to the maximum value of 44.97%.

关 键 词：氮气泡沫 油藏非均质性 细菌 流变性 岩心流动实验 

分 类 号：TE357[石油与天然气工程—油气田开发工程]