摘要
油基钻井液在大位移井长裸眼段钻井过程中有较好的防塌效果。针对采用油基钻井液钻井时井壁是否存在垮塌周期问题,该文利用连续刻划实验,研究了油基钻井液浸泡对泥岩单轴抗压强度、弹性模量的影响。结果表明:油基钻井液长时间浸泡会降低泥岩单轴抗压强度和弹性模量,与水基钻井液类似,油基钻井液同样存在垮塌周期,因此,在长裸眼井段施工中要考虑井壁坍塌周期。
Oil-based drilling fluid has a good effect in preventing collapse of long open hole section of large-displacement well.To determine if there is a wellbore collapse cycle when using oil-based drilling fluid,in this paper Scratch Test was conducted to study influence of oil-based drilling fluid on uniaxial compressive strength and elasticity modulus of shale.Results showed that if oil-based drilling fluid soaks for a long time,it would reduce uniaxial compressive strength and elasticity modulus of shale.Similar to waterbased drilling fluid,oil-based drilling fluid also has a collapse cycle,which should be considered in the long open hole construction.
作者
邱康
宫吉泽
方华良
张瑞
QIU Kang;GONG Jize;FANG Hualiang;ZHANG Rui(SINOPEC Offshore Oilfield Services Company,Shanghai 200120,China;CNOOC China Limited-Shanghai,Shanghai 200030,China)
出处
《海洋石油》
CAS
2019年第4期61-64,88,共5页
Offshore Oil
关键词
油基钻井液
长裸眼段
泥岩
钻井液浸泡
连续刻划
泥岩特性
oil-based drilling fluid
long open hole
shale
soaking by drilling fluid
Scratch Test
shale characteristics
