| 摘要 |
The invention concerns annular fluid manipulation in lined tubular systems, comprising a method of reducing propensity for propagation of cracks in a host tubular, comprising the steps of: providing a liner within said host tubular, said liner and host tubular having a fluid-circulating space provided therebetween; determining a safe pressure which can be applied by gaseous or multiphase fluid to said host tubular without causing substantial propagation of cracks in said host tubular; providing a fluid in a bore within said liner at a pressure greater than said safe pressure; and manipulating a fluid in said fluid-circulating space so that its pressure is at a level below said safe pressure.
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