漂浮下套管技术在ZJ油田页岩气水平井YH1-6井的应用  

APPLICATION OF FLOATING CASING RUNNING TECHNOLOGY IN WELL YH1-6 OF SHALE GAS HORIZONTAL WELL IN ZJ OILFIELD

作　　者：李海[1] 杨永祥[1] 田玉栋[1] LI Hai;YANG Yong-xiang;TIANG Yu-dong(Drilling En gineering Technology Institute,PetroChina,Daqing 163413)

机构地区：[1]大庆钻探工程公司钻井工程技术研究院,黑龙江大庆163413

出　　处：《新疆石油天然气》2020年第1期16-20,I0002,共6页Xinjiang Oil & Gas

基　　金：国家科技重大专项(2012ZX0518-006);中国石油天然气集团公司重大专项(2012F-47-02)。

摘　　要：YH1-6井属于ZJ油田昭通国家级页岩气示范区太阳大寨区块,曾有3口水平井采用漂浮下套管成功下到预定井深。YH1-3井井深2251 m,常规下套管最深仅下至2225.4 m,针对同平台的YH1-6井相对井深更深、垂深浅、偏移距大,采用漂浮下套管,仍在1278 m发生下套管遇阻,后破裂盘提前失效。结合昭通页岩气地区工程地质特点,分析对比模拟YH1-6井下套管施工方案,创新提出了一种先根据不同磨阻系数,优化制定了“上加压,下增浮”优化方案,第二次下套管前通过软件模拟计算摩阻系数、优选漂浮段长、合理优化配重,保证了再次下套管顺利到底,初步形成了适合ZJ油田太阳大寨区块一套页岩气水平井漂浮下套管技术。Well YH1-6 belongs to taiyangdazhai block of Zhaotong national shale gas demonstration area of ZJ oilfield.Three horizontal wells have successfully run to the predetermined well depth by floating casing.The depth of well yh1-3 is 2251 m,and the maximum conventional casing running depth is only 2225.4 m.For the well yh1-6 on the same platform,which is deeper,shallower in vertical depth and larger in offset,floating casing running is still used,and the casing running is still blocked at 1278 m,and the rupture disk fails in advance.Combined with the engineering geological characteristics of Zhaotong shale gas area,the construction scheme of downhole casing of yh1-6 is analyzed and compared,and an optimization scheme of"up pressure,down float"is proposed based on different friction coefficient.Before the second casing running,the friction coefficient is calculated by software simulation,the length of floating section is optimized,and the balance weight is reasonably optimized to ensure the smooth running of casing again,then,a set of floating casing technology suitable for horizontal shale gas wells in taiyangdazhai block of ZJ oilfield has been preliminarily formed.

关 键 词：漂浮下套管 页岩气 水平井 

分 类 号：TE256.2[石油与天然气工程—油气井工程]