DOI: 10.11799/ce202312015
Optimization design of well bore structure of vertical gas extraction well drilled through goaf
HUANG Wei
Abstract：In order to drill through the goaf quickly and safely,based on the calculation formulas for the height of the collapse zone,fracture zone,and floor water conduction failure zone in the"upper three zones",the depth of the well section prone to drilling fluid leakage is obtained.The optimized structure of the fourth spud well and the corresponding circulating medium used in the well section are proposed.On this basis,combining with the geological conditions of the Sihe mining area in the Qinshui Basin,the well structure design and circulating medium performance choice were carried out,and a vertical well for gas extraction crossing the goaf was successfully implemented.The results show that for the first,second,and fourth spud sections drilling with water-based drilling fluid systems with minimal leakage,while the third spud section is drilled using nitrogen circulation medium,which can efficiently and smoothly drill through the goaf at one time,achieving the goal of rapid and safe completion.
Keywords：crossing goaf gas extractionrock disturbance zonewell structuredrilling methodvertical gas extraction well
Publication Date：2023-12-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 85-88 )