Application of Deepening Drilling Technology for Old Wells in the Yanchuannan coalbed Gas Field
This article takes the Yanchuannan coalbed Gas Field as an example.In response to the key technical difficulties of small wellbore annulus clearance,high mud resistance,low upward displacement,easy collapse of coal seams,and easy water absorption and expansion of mudstone during the deepening drilling process of old wells,a set of pre drilling technology,wellbore trajectory control technology,open Hole drilling technology,drilling fluid technology,cementing technology,and leakage prevention measures suitable for coalbed methane old wells Have been formed through simplifying drilling tool combinations,strengthening drilling parameters,optimizing drilling fluid systems,optimizing casing selection and other technical means,laying the foundation for the next step of benefit development of the gas field.
deep drilling technologykey technologyguarantee measuresapplication effect
NETL
NSTL
万方数据
维普
