【摘 要】
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A new protocol to Plugging micro-fracture by using high temperature emulsified bitumen(HTEB)was investigated in this paper.The sizes of HTEB was fit for the sizes of micro-fracture,which approved by S
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A new protocol to Plugging micro-fracture by using high temperature emulsified bitumen(HTEB)was investigated in this paper.The sizes of HTEB was fit for the sizes of micro-fracture,which approved by SEM and laser particle size analyzer.When 4%polymer was added to emulsified bitumen,the soft point of asphalt could be promoted to 136 oC.The viscosity of mud increased with HTEB as additive,which was lower than SAS.With 4%HTEB added to drilling mud,the static filtration was 17.6 ml,the viscous coefficient and extreme pressure lubrication were reduced by 14.8%and 13.0%respectively.The inhibition of shale expansion was excellent than FT-3000 and the permeability recovery could be reach to 88.26%,which meet for specification requirements.The mud cake,which formed by HTEB as additive,was thin,toughness and dense,which proved by SEM.The obtaining process of this additive was simple and the performance in plugging micro-fracture was excellent,so this kind of plugging agent could have a better application future.
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