Drilling technology for Well Zhetongdi-1 for shale gas geological survey

Abstract:

Well Zhetongdi-1 is a shale gas geological survey well deployed in Baijiang Town, Tonglu County, Zhejiang Province. The well is aimed to explore the gas-bearing properties of the shale gas new strata of the Ordovician Hule Formation and Ningguo Formation in the Lower Yangtze area by taking cores and logging wells. The article describes in detail the basic conditions of the well, the drilling process and the well deviation treatment method. When the depth was 140m, the well deviation was serious and exceeded the specification by 9.3°; thus, it was plugged and was re-drilled. Through optimum combination of drilling parameters such as weight-on-bit, rpm, and pumping volume, and use of the bottom jet bit with concentric pointed teeth, well deviation caused by the strong deflecting formation was eliminated with maximum deviation of 5.5°, meeting design requirements.