Drilling technology for Well Chaoye1

Abstract:

The Well Chaoye1 is the first shale gas resource survey well deployed in the Chaoshui Basin. It requires high quality coring. There are large sections of shale in the strata, which are easily hydrated and spalled, making drilling difficult. This article focuses on the experience of the coring process, bit selection, drilling fluids technology and well deviation control technology for the Well Chao1. Large-diameter wireline coring was used Chaoye1, and the full well section below the Quartenary formation was cored. Though there were very few cases with this technology for reference in Gansu, core recovery was achieved close to 90%. During the drilling process, by choosing reasonable drilling parameters and a drilling fluid with strong wall protection performance, the technical difficulties encountered in the formation such as formation slippage and poor wellbore wall stability were solved, and the smooth completion of the well was ensured.