selective sand control
... selective frequency control 选择频率控制 Magnetic Selective Ride Control 电磁选择悬挂控制系统 selective sand control 选择性防砂 ...
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研究将防砂堵水工艺合二为一的新型防砂堵水剂，既能有效防砂，又有选择性堵水效果。
Therefore a new type of sand prevention and water plugging agent was studied in this paper. The new agent can prevent sand effectively, but also plug water with high selectivity.
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