Safety drilling technology of multi-lateral horizontal wells in coalbed
Abstract：Coalbed damage mechanism,borehole instability mechanism and safety drilling technologies of multi-lateral horizontal wells in coalbed were proposed,which studied by coalbed geology,drilling engineering characteristics and field practices.The research show that stress sensitivity,fluid and solid phase intrusive,water phase trap are main types of coalbed damage.Controlling drilling fluid filtration,enhancing compatibility of filtrate and coalbed,improving coalbed energy and damage relieve means are the effective measures of controling formation damage.Geological conditions complex,coal rock of low intensity,water inflatable uneven,drilling fluids properties instability,and drilling fluids density unreasonable are main reasons of coalbed damage and wellbore stability,during drilling in coalbed by multi-lateral well.Conducting studies,which on three-dimensional seismic optimization disposing wells,drilling technology,water modification and temporary shielding-flowback drilling fluids system,are useful to realize coalbed multi-lateral horizontal safety drilling.
Keywords：coalbed methanemulti-lateral horizontal wellswellbore stabilitycoalbed damage controldrilling fluids
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)