水合物藏水力压裂储层改造可行性评价模型及应用  

Fracability evaluation model and application of hydraulic fracturing in natural gas hydrate reservoir

作　　者：刘晓强 郭天魁[1] 曲占庆[1] 孙莹 侯健[1] 徐鸿志 贺甲元[5] LIU Xiaoqiang;GUO Tiankui;QU Zhanqing;SUN Ying;HOU Jian;XU Hongzhi;HE Jiayuan(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China;School of Earth and Spacing Sciences,Peking University,Beijing 100871,China;Beijing International Center for Gas Hydrate,Peking University,Beijing 100871,China;CNPC Offshore Engineering Company Limited,Beijing 100282,China;SINOPEC Petroleum Exploration and Production Research Institute,Beijing 100083,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]北京大学地球与空间科学学院,北京100871 [3]北京大学天然气水合物国际研究中心,北京100871 [4]中国石油海洋工程有限公司,北京100282 [5]中国石化石油勘探开发研究院,北京100083

出　　处：《中南大学学报（自然科学版）》2022年第3期1058-1068,共11页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52074332);中石油重大科技专项(ZD2019-184-002-003);中石化科技部攻关项目(P20040-4)。

摘　　要：基于层次分析法和熵值法,构建水合物储层可压性评价模型。结合水合物沉积物水力压裂实验结果,对水合物储层可压性进行评价。研究结果表明:由水合物沉积物自身属性决定的可压指数(IF)对可压性起关键作用,可压指数越高,水合物沉积物压裂形成裂缝的可行性越大。整体而言,可压指数小于0.48的水合物沉积物试样在高黏度压裂液和高压裂液排量下都未能形成裂缝,储层基本不具备可压性。可压指数在0.48~0.60之间的水合物沉积物试样已具备较好可压性条件,但需要提高压裂液排量和黏度减少压裂液滤失。可压指数高于0.60的水合物沉积物基本具有可压性,是采用水力压裂技术进行储层改造优先考虑的储层。但不建议采用滑溜水等低黏度压裂液,应采用高黏度压裂液且添加防黏土泥化膨胀组分,甚至采用无水压裂液,减少压裂液在黏土质粉砂水合物沉积物中的滤失以及抑制黏土的泥化。Based on analytic hierarchy process and entropy value method,the fracability evaluation model of natural gas hydrate(NGH)reservoir was established.Combined with the hydraulic fracturing test results,the fracability of NGH reservoir was evaluated.The results show that the fracability index(IF),which is determined by the properties of NGH reservoir,plays a key role in the fracability.The NGH reservoirs with high IFis favorable for hydraulic fracturing.On the whole,the NGH reservoirs with fracability index less than 0.48 fail to form fractures even with high viscosity and high injection rate of fracturing fluid,and those NGH reservoirs are not suitable for hydraulic fracturing.The NGH reservoirs with fracability index between 0.48 and 0.60 have good fracability conditions,but the injection rate and viscosity of fracturing fluid need to be improved to reduce the fracturing fluid filtration.The NGH reservoirs with fracability index higher than 0.60 are basically suitable for hydraulic fracturing.Those NGH reservoirs are preferred reservoirs for hydraulic fracturing technology.But fracturing fluid with low viscosity(such as slickwater)is not suitable.It is recommended to use high viscosity fracturing fluid with anti-clay slime welling components to reduce the fracturing fluid filtration and inhibit clay slime.

关 键 词：水合物 水力压裂 可压性评价 可压指数 

分 类 号：TE273[石油与天然气工程—油气井工程]