Study and application of light weight drilling fluid applied to coalbed methane development
Abstract：In view of the collapsibility of borehole face and coal formation pollution resulted from drilling fluid,developed the light weight drilling fluid through optimization experiments of hollow glass microspheres light weight additive and evaluation experiments of its influence on drilling fluid performances.The density of the developed light weight drilling fluid was reduced by adding hollow glass microspheres.The evaluation experiments of drilling fluid performances show that the light weight drilling fluid has good rheological property and filtration property,and its mud cake is thin and tight,its API filtration loss is less than 5 mL,and is less than 15 mL at high temperature and pressure,and after aging 16 h at 120 ℃,the drilling fluid performance is stable,which shows that it has good temperature tolerance.Moreover,this drilling fluid has a lot of good properties,such as antipollution,anti-sloughing,blocking,sedimentation stability and formation protection.This light weight drilling fluid,whose density is 0.95 g/cm3,was applied in one well for field trial successfully at Qinnan demonstration plot.Good performanc on protecting coal formation from pollution,which is good for sequent development of coalbed methane,was observed.
Keywords：coal methane developmentlight weight drilling fluidcoal formationpollutionhollow glass microsphere
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 815-819 )