连续管水力喷射压裂机理与试验研究  

Study of fracturing mechanism and test of hydraulic jetting with coiled tubing

作　　者：贺会群[1,2] 李相方[1] 胡强法[2] 朱峰[2] 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室 [2]江汉机械研究所

出　　处：《石油机械》2008年第4期1-4,14,共5页China Petroleum Machinery

基　　金：国家863计划2006年重点课题“连续管技术与装备”(2006AA06A106)

摘　　要：面对我国日益增加的"多井低产"问题,连续管水力喷射压裂技术作为一项能够有效提高单井产量的新技术而备受关注。依托国家863计划的重点课题,探索了连续管水力喷射压裂机理;基于孔内压力分布的数值模拟,验证了水力射流射入孔内的增压作用与水力封隔作用导致孔内压力升高的作用机理,分析了主要参数对孔内压力分布的影响;以连续管管径为重要特征参数,提出了连续管水力喷射压裂3种作业方式。基于试验研究,验证了连续管水力喷射压裂机理和数值模拟计算结果,认为在相同喷嘴压降下,孔内压力随着围压增加近似于呈线性增大;在井眼垂深较大、地层破裂压力较高时,推荐使用高一些的喷嘴压降,以获得更好的增压作用与水力封隔效果;对于连续管水力喷射压裂,通常采用管径不小于50·8mm(2英寸)的连续管。For solving the increasing problem of 'many wells, but low productivity' in our country, the hydraulic jetting fracturing technology with coiled tubing, as a new one for effectively improving the production rate of individual well, is paid much attention nowadays. Relying on the key subject of State Plan 863, the hydraulic jetting fracturing mechanism with coiled tubing is explored. On the basis of numerical simulation of pressure distribution inside the pores, the mechanism of pressure rise inside the pores caused by the pressure boost action within the jetting pore and the hydraulic isolation action is examined, and the influence of main parameters on the pressure distribution inside the pores is analyzed. Three kinds of operating methods of hydraulic jetting fracturing with coiled tubing are raised with the tubular diameter of coiled tubing as important feature parameter. According to the test study, the fracturing mechanism and computational results of numerical simulation are both examined. It is considered that under the same pressure drop of jet nozzle, the pressure inside the pores increases with the confining pressure nearly at a linear state. When the vertical depth of the borehole is rather big and the rupture pressure of the formation is higher, it is recommended to use higher pressure drop of jet nozzle for achieving better pressure boost and hydraulic isolation effect. For the hydraulic jetting fracturing with coiled tubing, the coiled tubing with tubular diameter not less than 50.8 mm (2 in.) is usually used.

关 键 词：连续管 水力喷射 压裂 数值模拟 试验研究 

分 类 号：TE355.6[石油与天然气工程—油气田开发工程] TD322.1[矿业工程—矿井建设]