The wearing away of material, usually rock or steel, by the continuous abrasive action of a solids-laden slurry. For erosion to occur usually requires a high fluid velocity, on the order of hundreds of feet per second, and some solids content, especially sand. Erosion may also occur in gas streams, again assuming the presence of sand particles. It is usually difficult to erode the wellbore wall significantly with drilling mud alone due to its relatively low velocity and high viscosity. There is also a dramatic "self-limiting" effect because even slight enlargement of the original gauge wellbore dramatically decreases fluid velocities.
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self-limiting 疾病自限性 ; 限制 ; 自我限制
self limiting chain reaction 自限链式反应
self limiting reactor 自约束反应堆
self-limiting reactor 自限制反应器 ; 自调节堆
self limiting parallel heater 自限制式并联加热器
self-limiting cycle 中炎症的自限制循环
Self-limiting infection 一种自我限制的感染 ; 自我限制的感染
self limiting illness 自限性疾病
"It's harmless because the amount people use is self limiting," she says. "people back off when they feel jittery."
“它是无害的，人们饮用的量是有限的，”她说，“当人们感觉神经过敏的时候自然会停止引用。”
Pityriasis rosea is an acute, benign, self-limiting skin rash.
玫瑰糠疹是一种急性的良性自限性皮疹。
Outside Mexico, where the outbreak is not yet fully understood, the overwhelming majority of cases have been mild and self-limiting, with no need for treatment.
在墨西哥之外，对疫情尚无充分了解，绝大多数病例病情较轻并具有自限性，不需要任何治疗。
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