天然气勘探与开发2024，Vol.47Issue(4)：106-111,6.DOI:10.12055/gaskk.issn.1673-3177.2024.04.012
川渝地区复杂深井多层系多岩性地层取心技术
Coring techniques for series of strata with various lithologies in complex deep wells,Sichuan-Chongqing area
摘要
Abstract
There developed reservoirs,series of strata with various lithologies,and fragmented strata in most complex deep to ul-tra-deep wells,Sichuan-Chongqing area.Frequent core blocking and sticking while coring in such wells lead to coring challenges of uncertain recovery,little footage each coring,low ROP,and long cycle,which may seriously affect coring quality and efficiency.Thus,several coring techniques were developed for these wells from aspects of stratigraphic distribution,coring difficulties and some opti-mization on coring bit,tools,parameters and process.Their application demonstrates that,(i)containing three-barrel,rotary,screw and full-size coring,four innovative techniques are conducive to diminishing the core blocking and sticking,increasing the footage each coring and the ROP,and avoiding complexities;and(ii)the new coring for shale gas wells in southern Sichuan Basin,the long-barrel coring for ultra-deep wells in eastern and central basin,the coring for highly deviated wells of underground gas storages,and the cor-ing for deep coals also in Sichuan-Chongqing area are proposed for different areas.Setting the coring record in China several times,the above-mentioned techniques support quality and efficient coring,and make the recovery exceeding 97.68%and the cycle shortened by over 20.73%,respectively.关键词
川渝地区/复杂深井/多层系/多岩性地层/取心Key words
Sichuan-Chongqing area/Complex deep well/Series of strata/Strata with various lithologies/Coring引用本文复制引用
敬婧..川渝地区复杂深井多层系多岩性地层取心技术[J].天然气勘探与开发,2024,47(4):106-111,6.基金项目
中国石油集团公司科研项目(编号:2021DJ4204). （编号:2021DJ4204）
