Research on the application of large diameter drainage hole piling technology in minefield
LI Bin
ZHANG Yueheng
LIU Qingdong
DONG Zhenguo
Abstract：To address the issues of large diameter drainage holes with large aperture,high requirements for hole quality,complex well completion,and high construction difficulty,a technical research on re-verse circulation drilling of large diameter drainage holes is carried out.Before drilling,optimize the drilling structure and drilling process based on the stratum,drillability,and aquifer conditions of the pilot hole;During drilling,anti deviation drilling and fast drilling are carried out through the imple-mentation of"cross operation"and"one trip drilling"operation modes,large diameter PDC scraper bits,rigid drilling tool combinations,high-quality drilling fluids,etc;After drilling,gyroscopes are used to measure the inclination,the end of the casing is directly welded,the casing is lowered by ele-vators,and the well is cemented using interpolation methods to ensure the quality of the well comple-tion.The results show that during the drilling process,the use of a large diameter PDC scraper bit combined with efficient rock breaking and high-quality drilling fluid slag removal technology for re-verse circulation drilling to carry out one-time hole formation has improved drilling efficiency and shortened the well construction cycle;Rigid drilling is beneficial for preventing deviation and straight-ening,ensuring the verticality of drainage holes;Gyro survey meter can obtain accurate bottom hole displacement,and the combination of truck crane and elevator can lower the casing,resulting in a high safety factor;The method of inserting cement into the pipe improves the quality of cementing.The results show that the one-time drilling technology using reverse circulation drilling has achieved high-quality and efficient construction of two large diameter drainage holes.The final diameter of the drainage hole is 650 mm,and the depth of the single hole is 144 m.The quality of the hole body basi-cally meets the design requirements.
Keywords：large diameter drainage holereverse circulation drillingPDC scraper bitanti deviation dril-lingcasing and cementing
Publication Date：2025-08-10
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 8-15 )