水平井蒸汽吞吐注汽筛管位置调整时机优化研究  

Study on Optimization of Position Adjustment Occasion of Steam Injection Screen Pipe for Steam Stimulation in Horizontal Wells

作　　者：李兆敏[1] 赵心茹 班晓春 鹿腾[1] 张丁涌[3] 张江[3] 石明明 孙超[3] Li Zhaomin;Zhao Xinru;Ban Xiaochun;Lu Teng;Zhang Dingyong;Zhang Jiang;Shi Mingming;Sun Chao(China University of Petroleum(East China),Qingdao,Shandong 266580,China;China Oilfield Services Limited,Tianjin 300450,China;Sinopec Shengli Oilfield Company,Dongying,Shandong 257068,China)

机构地区：[1]中国石油大学(华东),山东青岛266580 [2]中海油田服务股份有限公司,天津300450 [3]中国石化胜利油田分公司,山东东营257068

出　　处：《特种油气藏》2021年第5期93-99,共7页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金企业创新发展联合基金“难采稠油多元热复合高效开发机理与关键技术基础研究”(U20B6003)。

摘　　要：针对稠油油藏水平井蒸汽吞吐吸汽不均导致热效率低的问题,采用数值模拟方法,对非均质储层水平井段吸汽规律进行研究,分析了注汽筛管位置对水平井段吸汽规律的影响,引入温度变异系数对比多个周期水平段吸汽不均的程度,并提出了注汽筛管位置调整时机优化方法,根据温度变异系数先降后升的“V”字形变化规律,对比不同阶段调整注汽筛管位置对蒸汽吞吐采油的影响。结果表明:蒸汽吞吐初期温度变异系数不断下降,依据热力学加和性原理,该阶段吸汽较好的储层比热容升高,证明含水量不断增大,剩余油被大量采出,此时调整筛管位置无法充分动用高渗储层的剩余油;若在蒸汽吞吐后期调整筛管位置,则高渗区的油大量采出后至筛管调整前这一阶段,蒸汽注入后富集于高渗低含油区,热利用效率低;在温度变异系数达到最小值时,说明高渗段油藏体系比热容升至较高值,含水饱和度大,剩余油较少,此时调整筛管位置可改善非均质储层动用不均的问题,因此,温度变异系数达到最小值后越早调整筛管位置效果越好。将研究成果应用于乐安油田,通过温度变异系数方法选择时机调整筛管位置后,吸汽剖面更为均衡,平均日产油由上一周期的0.5 t/d提高至3.4 t/d。研究成果对改善蒸汽吞吐吸汽不均有指导意义。In order to solve the problem of low thermal efficiency caused by uneven steam injection of steam stimulation in horizontal wells in heavy oil reservoirs,numerical simulation methods were used to study the steam injection law of horizontal wells in heterogeneous reservoirs,the impact of steam injection screen pipe position on the steam injection law in horizontal wells was analyzed,the temperature variation coefficient was introduced to compare the degrees of uneven steam injection in horizontal sections in multiple stages,the method for optimizing the position adjustment occasion of the steam injection screen pipe was proposed,and the impact of the position adjustment of the steam injection screen pipe at different stages of the curve on the steam stimulation oil production was compared according to the"V"-shaped law of the temperature variation coefficient firstly decreasing and then increasing.The results showed that the temperature variation coefficient was decreased continuously in the initial stage of steam stimulation;according to the principle of thermodynamic additivity,the specific heat capacity of reservoirs with better steam injection at this stage was increased,proving that the water cut was increased continually,the remaining oil was produced in large amounts,and the adjustment could not fully utilize the remaining oil in the high-permeability reservoir at this moment;if the position of the screen pipe was adjusted in the late stage of steam stimulation,the steam was injected and accumulated in the high-permeability area with low oil content after a large amount of oil was recovered from the high-permeability area until the screen pipe was adjusted,resulting in low heat utilization efficiency;when the temperature variation coefficient reached the minimum value,indicating that the specific heat capacity of the high-permeability reservoir system raised to a higher value,with high water saturation and less remaining oil,the adjustment of screen pipe position at this moment could improve the uneven deve

关 键 词：蒸汽吞吐 水平井 注汽筛管 数值模拟 吸汽不均 动用程度 乐安油田 

分 类 号：TE345[石油与天然气工程—油气田开发工程]