If skin factor of formation damage is more, its radius of investigation is less.
井底附近地层渗透率降低比改善对调查半径的影响要大。
The influence of temperature, pressure and shear rate on formation damage are also discussed.
讨论了温度、压力、速度梯度对保护储效果的影响。
Method Based on experimental study result, mechanism of formation damage from temperature oscillation is analyzed.
方法根据实验研究成果，分析温度震荡引起的储层损害的机理。
To damage, kill, or make inoperative by cold or by the formation of ice.
冻坏，冻死，冻僵通过寒冷或冰的形成而引起破坏、冻死或使不起作用。
To damage, kill, or make inoperative by cold or by the formation of ice.
冻坏，冻死，冻僵：通过寒冷或冰的形成而引起破坏、冻死或使不起作用。
What is worse, sand particles may even flow back into the formation to cause damage.
更为严重的是，井底砂粒可能随冲砂液重新返入油层，并对油层造成伤害。
What is worse, sand particles may even flow back into the formation to cause damage.
更为严重的是，井底砂粒可能随冲砂液重新返入油层，并对油层造成伤害。
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