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。

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The production casing cementing problems in Tahe Oilfield in 1998 are analyzed, and the main reasons causing low cementing quality are found.

针对塔河油田1 998年生产套管固井质量存在的问题进行了分析，找出了影响固井质量的主要因素。

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A completion configuration in which a production casing string is set across the reservoir interval and perforated to allow communication between the formation and wellbore.

一种完井结构，其中的生产套管柱下过储层层段并经射孔，以便在地层与井筒之间能够连通。

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"We have known for some time that the cement used to secure the production casing and isolate the hydrocarbon zone at the bottom of the Macondo well must have failed in some manner, " the letter said, noting that BP used a "nitrogen foam cement" recommended and supplied by Halliburton.

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Then there is Halliburton, which was contracted to cement the production liner in the well casing, effectively sealing off the reservoir from the well bore.

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Halliburton ( HAL - news - people ), which was contracted to cement the production liner in the well casing, effectively sealing off the reservoir from the well bore.

FORBES: The Gulf Oil Leak