摘要
结合川西实践,总结出定向井压裂表现的特点:破裂压力异常、近井摩阻大、施工压力较直井高、压后效果斜井较直井差,并就其原因进行了分析,得到近井效应显著、裂缝空间转向、多裂缝的形成是造成定向井压裂施工难度大和压后效果普遍较直井差的主要原因。围绕分析结果进行了定向井压裂工艺技术研究,提出了优化射孔、前置液段塞、线性加砂、变排量压裂工艺技术、以及变粘压裂液、增加前置液量、增大加砂规模等措施。2006年在川西马井和新都地区共进行了16井次定向井现场应用,施工成功率100%,工业气井建成率达94%;2005年马井区块平均直井、斜井压后无阻流量之比为2.05,2006年仅为1.39,同井组斜井、直井压后产量差距明显缩小。该研究为开发定向井提供了有效的手段,增产效果显著,具有很好的推广应用价值。
The characteristic of directional well fracturing in western Sichuan is fracturing pressure and the friction near wellbore is very high,fracture feature is complex,directional wells operation pressure is higher than straight wells',and its fracturing effectiviness is bad versus straight wells'.Analysis on the reason of the characteristic of directional well fracturing and the result are as follows,obviously near wellbore influence,fracture diversion and many fractures coming into being are the main reasons that make fracturing operation difficulty and the effectiviness worse than vertical well'.According to research on hydraulic fracturing technology of directional wells,the measurements are optimized perforation,proppant slug in prepad fluid,lineal gravel input,altering delivery rate,variable viscosity fracturing fluid and increasing the amount of prepad fluid and proppant and so on.There are sixteen directional wells field application in Majing and Xindu gas fields in western Sichuan.The successfull proportion of wells that are implemented is 100%,The proportion of industry gas wells attained to 94%,The multiple proportion of gas AOF after directional and straight well fracturing in 2005 is 2.01,however,the multiple proportion drops to 1.39 in 2006,The gap between directinal and straight productivity in the same region of wells reduce obviously.The research in this paper offers available approaches for developing directional wells,the effectiviness of field application is obvious.The research is of important popularization and practical application value.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第1期111-115,共5页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家科技支撑课题"复杂气田采气工艺技术研究"(2006BAB03B07)
关键词
定向井
水力压裂
工艺
研究
现场应用
directional wells
hydraulic fracturing
technique
research
field application
