G函数压降分析方法优化及应用  

Pressure Drop Analysis Methods for Small-scale Fracturing

作　　者：王聚团 刘银山 黄志明 徐敏 马彬 洪千里 Wang Jutuan;Liu Yinshan;Huang Zhiming;Xu Min;Ma Bin;Hong Qianli(CNOOC Shenzhen Ltd.,Shenzhen,Guangdong 518067,China;Research Institute of Yanchang Petroleum(Group)Co.,Xi'an,Shaanxi 710065,China;Deep Ocean Technology Co.,Ltd.,Shenzhen,Guangdong 518067,China)

机构地区：[1]中海石油深圳分公司,广东深圳518067 [2]陕西延长石油(集团)有限责任公司研究院,陕西西安710065 [3]深圳深洋海工技术有限公司,广东深圳518067

出　　处：《非常规油气》2020年第4期81-84,共4页Unconventional Oil & Gas

基　　金：延长石油科研项目“低渗透油气田勘探开发新技术导向研究”(ycsy2018ky-B-01)资助。

摘　　要：基于体积平衡原理,通过G函数压降分析的方法,建立了小型压裂压降曲线分析模型,并通过实例计算分析进行曲线拟合的对比性分析,在此基础上优化了G函数压降分析方法。研究结果表明:关井后dp/dG在0~3000间大幅波动,在关井后期dp/dG显示为水平特征,Gdp/dG显示为直线特征,G值分布在0~0.83之间。此时显示压裂液滤失与压力无关,得到拟合压力为9.25 MPa,验证了优化后的G函数压降分析方法具有更强的实用性,可应用于裂缝性储层。Small-scale fracturing pressure drop curve analysis model was established by G function of pressure drop analysis method based on the volume balance principle to create. We compared the curve fitting method and improved G function drop analysis method through the instance of the computational analysis. The result shows that the value of dp/dG waved in 0~3 000 after shut-in, curve dp/dG shows level and Gdp/dG shows line feature later while G is 0~0.83. Now the fluid loss is pressure-independent and fitting pressure is 9.25 MPa. It proved that improved G function drop analysis method has wider applicability, including fractured reservoirs.

关 键 词：压降分析 小型压裂 曲线拟合 优化G函数 

分 类 号：TE355[石油与天然气工程—油气田开发工程]