دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: any relatively sticky formation (such as clay) encountered in drilling.

n: a naturally occurring clay that contaminates the mud as the hole is being drilled.the clay hydrates rapidly to form a thick plug that can not pass through a marine riser or mud return line.

sticky, reactive shale formation.

n: a kind of soft rock with high montmorillonite and water,and which is easy to absorb water and swell ,as a rusult , the borehole lessens,the tools and bit are balled up ,jams the borehole ,and even leads other borehole problems