高孔高渗高含水稠油油藏剩余油分布特征及动用的主控因素  

Remaining oil distribution characteristics and main controlling factors for use in high porosity,high permeability and high water cut heavy oil reservoirs

作　　者：乐平[1] 屈思敏 李丰辉 王庆利 张梨 罗翔 冯鑫 任宜伟 YUE Ping;QU Simin;LI Fenghui;WANG Qingli;ZHANG Li;LUO Xiang;FENG Xin;REN Yiwei(State Key Laboratory of Reservoir Geology and Development,Southwest Petroleum University,Chengdu 610500,China;CNOOC(China)Tianjin Branch,Tianjin 300000,China;No.4 Oil Production Plant,PetroChina Changqing Oilfiled Company,Shaanxi Yulin 719000,China;CNOOC Energy Technology&Services Limited,Tianjin 300000,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,成都610500 [2]中海石油(中国)天津分公司,天津300000 [3]中国石油长庆油田分公司第四采油厂,陕西榆林719000 [4]中海油能源发展股份有限公司工程技术分公司,天津300000

出　　处：《非常规油气》2023年第2期33-42,共10页Unconventional Oil & Gas

基　　金：国家自然青年基金项目“考虑启动压力条件和井筒压降的底水油藏分支水平井水脊耦合模型”(51404201);四川省科技厅区域创新合作项目“致密油藏水平井体积压裂多尺度非线性流动耦合模型及产能预测”(20QYCX0028)。

摘　　要：针对CFD11-1油田943砂体大量剩余油无法动用的问题,结合动态数据和生产数据,将注入流体、地层倾角、渗透率韵律和级差4种因素进行数值模拟,对油藏剩余油分布类型以及影响海上高孔高渗油藏剩余油动用的主控因素进行分析。结果表明:1)高孔高渗高含水稠油油藏的剩余油分布类型可分为油藏边缘井网未控制、井间未控制、相对低渗绕流和构造高部位4种;2)注入流体是影响不同类型剩余油动用的首要因素,说明注入流体优选和有效波及仍是未来提高海上油藏采收率的主要方向之一。注入流体与不同剩余油类型的结合应兼具经济性和环保性,例如构造高部位的气驱与活性水相比仅降低1.59个百分点;3)相比于气驱,活性水驱扩大平面波及效率,有效减弱指进效应,边部剩余油井组采出程度提高了12.88个百分点;4)剩余油动用敏感性因素分析显示,注入流体和地层倾角是影响采出程度的主控因素,受油藏高孔高渗影响,渗透率韵律和级差已经不是限制流体流动的主要因素,其对采出程度的影响不超过1%。该研究成果对海上高孔高渗稠油油藏的高效开发有一定的指导作用。In view of the problem that a large amount of remaining oil in the 943 sand body of the CFD11-1 oilfield cannot be produced, combined with the dynamic data and production data, four factors, including injection fluid, formation dip, permeability rhythm and differential, were numerically simulated, and the distribution type of remaining oil in the reservoir and the main control factors affecting the production of remaining oil in offshore high porosity and high permeability reservoirs were analyzed. The results show that: 1)The distribution types of remaining oil in heavy oil reservoirs with high porosity, high permeability and high water cut can be divided into four types: uncontrolled well pattern at the edge of the reservoir, uncontrolled well spacing, relatively low permeability bypass and high structural position;2)Injection fluid is the primary factor affecting the production of different types of remaining oil, which shows that the optimization of injection fluid and effective sweep are still one of the main directions to improve the recovery efficiency of offshore reservoirs in the future. The injection fluid combined with different types of remaining oil should be both economic and environmental friendly. For example, compared with the active water, the gas drive at the high part of the structure is only 1.59% lower;3)Compared with gas drive, the active water drive expands the plane sweep efficiency and effectively weakens the fingering effect, the recovery percent of the remaining oil well groups at the edge is increased by 12.88%;4)The analysis of remaining oil production sensitivity factors shows that the injection fluid and formation dip angle are the main controlling factors affecting the recovery degree. Influenced by the high porosity and permeability of the reservoir, the permeability rhythm and differential are no longer the main factors limiting fluid flow, and their impact on the recovery degree does not exceed 1%. The research results have a certain guiding role in the efficient development of

关 键 词：剩余油分布 主控因素 采出程度 敏感性 活性水驱 数值模拟 高孔高渗 稠油油藏 高含水 

分 类 号：TE34[石油与天然气工程—油气田开发工程]