低成本防水侵水泥浆体系在陇东页岩油水平井的应用  

The application of low-cost anti-water channeling cement slurry in the shale oil horizontal well of the Longdong area

作　　者：刘钰龙 兰小林 王鼎 LIU Yulong;LAN Xiaolin;WANG Ding(Drilling and Production Engineering Technology Research Institute,CNPC Chuanqing Drilling Engineering Company Ltd.,Xi'an 710018,China;National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields,Xi'an 710018,China;Changqing Cementing Company,CNPC Chuanqing Drilling Engineering Company Ltd.,Xi'an 710018,China)

机构地区：[1]中国石油川庆钻探工程有限公司钻采工程技术研究院,陕西西安710018 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [3]中国石油川庆钻探工程有限公司长庆固井公司,陕西西安710018

出　　处：《复杂油气藏》2024年第1期103-111,共9页Complex Hydrocarbon Reservoirs

摘　　要：陇东页岩油水平井上部洛河组地层承压能力低,地层水活跃,存在固井难题,现有轻珠体系存在耐压性能差、受压后流变性能恶化且不抗水侵的问题。为此,研发出低成本防水侵耐压低摩阻水泥浆体系,与同密度玻璃微珠体系相比,该体系1 m3浆成本下降50%左右,水下水泥损失量低于0.5%,水陆强度比高于0.85,耐压密度差不高于0.03 g/cm^(3);水泥浆受压后n>0.5,k<1.5 Pa•sn,45℃常压养护48 h水泥石抗压强度大于7 MPa,在水泥浆成本与轻珠体系相差不多情况下,水泥浆性能得到大幅度提升。在陇东的60口页岩油水平井应用,现场施工压力明显降低,未发生漏失,水泥浆返高满足设计要求,洛河水层封固合格率100%,为低压易漏水层固井提供了有力的技术支撑。The Luohe Formation in the upper part of the horizontal well of Longdong shale oil has low pressure bearing capacity and active formation water,resulting in cementing problems.The existing light bead system has problems such as poor pressure resistance,deterioration of rheology after pressure and lack of resistance to water intrusion.For this reason,the low-cost waterproof penetration pressure resistance low friction slurry system was developed.Compared with the glass micro-bead system of the same density,the 1m3 slurry cost of the system is reduced by about 50%,the underwater cement loss is less than 0.5%,the water-land strength ratio is higher than 0.85,the pressure density difference is not higher than 0.03g/cm^(3).After the cement slurry is pressurized,n>0.5,k<1.5Pa•sn,the cement stone's compressive strength is greater than 7MPa after 48h of atmospheric pressure curing at 45℃.Under the condition that the cost of cement slurry is similar to that of the light bead system,the performance of cement slurry is greatly improved.In the application of 60 shale oil horizontal wells in the Longdong area,the field construction pressure is significantly reduced,no leakage occurs,the cement slurry return height meets the design requirements,and the sealing pass rate of the Luohe water layer is 100%,providing solid technical support for the cementing of low-pressure and leakage-prone layers.

关 键 词：页岩油 固井 低成本 防水侵 耐压 低摩阻 陇东 

分 类 号：TE256[石油与天然气工程—油气井工程]