It is a most popular and common occurrence that pressure changes in production casing.
在油气井中，油层套管内压力变化是最普遍、最常见的一种现象。
We are setting up a mill for production of tubing and casing couplings.
我公司新上接箍项目，主要生产石油套管接箍和油管接箍。
The gravel packing in casing is a effective method to prevent sand production.
套管内砾石充填防砂是一种行之有效的防砂方法。
The gravel packing in casing is a effective method to prevent sand production.
套管内砾石充填防砂是一种行之有效的防砂方法。
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