摘要
低渗透挥发油藏回注溶解气在开发初期地层压力较高,存在"采油易,注气难"的问题,随着地层压力的降低,开发中后期又会出现"采油难,注气易"的情况。因此,明确注采参数的界限是制定开发技术政策的前提。通过建立注采参数界限模型,推导得到已知地层压力下的最大采油速度、最大回注比以及临界压力的表达式,结合实例油藏绘制注采界限图版,研究了多因素对注采参数界限的影响规律并提出开发技术政策建议。结果表明,注采参数界限及图版准确可靠,能够反映实际生产情况;注采参数界限受注采能力、地层压力、采油速度、井网类型、井网密度等因素的影响,并且存在相应规律;溶解气应尽量全部回注,适当增大井网密度,在开发初期提高注气井比例,并根据回注比确定采油速度,在开发中后期降低注气井比例,提高采油速度,从而保障高质高效开发。
In the early stage of the development of low permeability and volatile oil reservoir with solution gas reinjection,the gas injection is more difficult than oil production due to high formation pressure.However,in the middle and late stage of development,the gas injection gets easier than oil production with the decrease of formation pressure.Therefore,it is the premise of making development technology policy to define the limits of injection&production parameters.Therefore,based on the limit model of injection and production parameters,expressions of maximum production rate,maximum reinjection ratio and critical pressure were deduced,and the chart to show the limits of injection and production parameters for a real case was made.Then,the influence law of multi factors on the limit of injection&production parameters was studied,and the development technical policy was proposed.The results show that the limits of injection&production parameters and the charts are accurate and reliable,which can reflect the actual production situation.The parameter limits are affected by injectivity&productivity index,formation pressure,production rate,well pattern type,well pattern density and other factors with corresponding laws.In the development period,methods of re-injecting all solution gas produced as far as possible,increasing the proportion of injectors and determine the production rate according to the reinjection ratio in the early stage of development,and reducing the proportion of producers can improve the production rate in the middle and late stage of development,and so as to ensure high-quality and efficient development.
作者
张晨朔
韩征
冯志刚
范子菲
许安著
何聪鸽
张道勇
李敬功
王凤荣
任继红
周立明
郭海晓
张昊泽
谷宇峰
ZHANG Chen-shuo;HAN Zheng;FENG Zhi-gang;FAN Zi-fei;XU An-zhu;HE Cong-ge;ZHANG Dao-yong;LI Jing-gong;WANG Feng-rong;REN Ji-hong;ZHOU Li-ming;GUO Hai-xiao;ZHANG Hao-ze;GU Yu-feng(Strategic Research Center of Oil and Gas Resources,MNR,Beijing 100034,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijng 100083,China;China National Offshore Oil Corporation,Beijng 100010,China)
出处
《科学技术与工程》
北大核心
2020年第35期14500-14504,共5页
Science Technology and Engineering
关键词
低渗透
挥发油藏
溶解气回注
注采参数
界限
影响规律
技术政策
low permeability
volatile oil reservoir
solution gas reinjection
injection&production parameter
limit
corresponding law
technology policy
