Borehole instability mechanism and Countermeasures Part-IV

Anti-collapse mechanism of Asphalt additives
Sealed Middle strata fractured, prevent water entering are one of the major measures of stabilize the borehole wall, asphalt products have exactly this particular performance. When the asphalt additives temperature below its softening point , it is in a solid state, close to its softening point, will becomes soft. Under the influence of pressure, asphalt additive is easily squeeze into stratigraphic fracture, in the vicinity of the wall to form a sealing tape. Since asphalt having hydrophobicity can effectively prevent the drilling fluid filtrate into the formation, control the formation of hydration, to prevent wall collapse.
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