Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Fault-Block Oil & Gas Field》 2018-03
Add to Favorite Get Latest Update

New cementing technology of dynamic pressure-control for high-pressure gas wells and its application

XIAN Ming;ZENG Fankun;NIE Shijun;WU Lang;CCDC Downhole Service Company,CNPC;  
With the exploration and development towards the periphery of the basin, exploration object is focused on the Permian and Cambrian in deep formation of Western Sichuan. Reservoir liner cementation depth has reached 7,500 meters under these circumstances. Cementing of ultra deep well in this exploratory area is generally faced with multiple pressure system and narrow density window, so conventional cementing process has not already met the requirement of effective sealing in view of the above-mentioned facts. Loss circulation and well kick co-existing are great challenges for liner cementing. For pressure-sensitive stratum,we have conducted dynamic pressure control cementing practice, forming cementing accessory process to be cored on annular pressure control under narrow density window and anti-channeling cement slurry. Pressure-control liner cementing process has successfully applied to 114.3 mm liner job in LG70 as the deepest exploratory well in Sichuan Basin for the first time in 2017. This technological skill has ensured the sealing quality effectively under the condition of narrow annular gap, high temperature, loss circulation and gas cut coexistence. Series of generalization and application have been made successfully for the cementing of ultra deep well in geological structures of Jiulongshan, Shuangyushi, etc. This also has provided a new practical cementing technology for leak prevention and anti-gas channeling of follow-up ultra deep gas well.
【Fund】: 中国石油天然气集团公司工程技术科技项目“川西地区高压气井窄密度窗口固井技术集成应用研究”(2017T-001-005)
【CateGory Index】: TE256
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved