松科2井超高温固井工艺技术  

Cementing Technology Anti Extra-high Temperature in Songke 2 Well

作　　者：刘秀成[1] 吴会年 闫醒宇 李艳[1] LIU Xiucheng;WU Huinian;YAN Xingyu;LI Yan

机构地区：[1]中国石化中原石油工程有限公司固井公司,河南濮阳457001

出　　处：《天然气技术与经济》2019年第1期34-38,82,共6页Natural Gas Technology and Economy

摘　　要：针对松辽盆地松科2井钻探过程中发现高温干热岩体,井底温度高达241℃,存在油井水泥外加剂配伍困难、水泥石强度易衰退、环空间隙较小、施工工艺复杂、固井质量难以保障等难题,通过水泥浆性能试验及固井工艺技术研究,研选了抗高温水泥浆降失水剂、缓凝剂,同时分析了水泥石抗高温衰退机理及防治措施,优选了适应超高温条件下的添加剂、外掺料,形成了超高温水泥浆体系。研究结果表明:(1)该水泥浆体系达到了超高温条件下固井的各项性能要求,在241℃、102MPa条件下性能稳定,稠化时间易调、流变性好、滤失量低、防窜能力强;(2)水泥石最高试验温度达到260℃、能够防高温衰退,抗压强度高、渗透率低、韧性强、弹性模量比普通水泥石大幅降低。施工工艺技术应用结果表明:耐高温冲洗隔离液、抗高温固井工具附件、扶正器的应用提高了施工浆体的顶替效率、保障了施工安全,确保了水泥环胶结质量;超高温固井工艺技术成功应用于松科2井直径127mm尾管固井作业,固井质量合格率达100%,优质率高达83%,为类似超高温深井条件下的固井作业积累了经验、提供了技术指导。Some high-temperature and dry rock mass was found in drilling Songke 2 well with the total depth of 7018 m and the bottomhole temperature of 241℃.After an application of cementing technology in this well,it is found that there are many problems,such as hard compatibility of slurry admixture,strength decay of cement paste,small annular clearance,complex operation process,and poorer cementing quality.So,we carried out one test of slurry performance,studied many cementing technologies,and high-temperature resistant fluid-loss additive and retarder,analyzed high-temperature resistant decay mechanism of cement paste,optimized additive agent and admixture suitable for extra-high temperature,and set up one system of extra-high temperature cement slurry.Results show this system may meet the cementing demand under extra-high temperature,especially under 241℃ and 102 MPa,various performance keeps stable or in good order,for example,adjustable thickening time,better rheology,lower filtration,stronger anti-gas channeling,better high-temperature resistance,higher compressive strength,lower permeability and elastic modulus,and stronger toughness.In addition,results show that(1)the flushing spacer fluid with high temperature resistance,the cementing tool accessories with high temperature tolerance,and the centralizer may be used to increase the displacement efficiency of construction slurry,ensure the operation safe,and guarantee the cement sheath bonding quality;(2)the pass cementing quality and the perfection rate are set at 100% after Ф127 mm liner cementing with extra-high temperature applying to Songke 2 well.

关 键 词：松科2井 超高温 水泥浆体系 小间隙尾管 固井工艺 

分 类 号：TE256[石油与天然气工程—油气井工程]