To vary from or oscillate setting , position , or mode of operation.

用于修饰或说明安全工作方式或编码工作方式.

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Setting position of rubber barrel should be located in different position of casing collar location.

封隔器胶筒坐封位置必需避开套管接箍位置.

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Bore hole should be clean without by - pass oil setting position of packer should avoid casing collar.

井筒必须清洁无死油,封隔器的座封位置应避开套管接箍.

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