负压钻井技术在中原油田的应用

The Application of Underbalanced Pressure Drilling in Zhongyuan Oilfield

为了正确认识油气藏的地质条件，中原油田对负压钻井技术进行了现场试验。负压钻井技术是大幅度降低钻井液对产层的污染、有效保护油气层的一种先进钻井工艺。本文对负压钻井的特点、应具备的条件和注意事项进行了论述，并对白21、毛8两口井的现场试验情况进行了分析，总结了成功的经验，提出了存在的问题及建议，对负压钻井新工艺的进一步推广有一定的借鉴意义。该技术能够最大限度地降低对产层的损害，有利于发现和保护油气层。

For understanding the geologic feature of the reservoir, underbalanced pressure drilling technology is tested in Zhongyuan Oilfield. It can decrease contamination of drilling fluid and protect the reservoir. The characteristics,the application condition and the notice of underbalanced pressure drilling technology are described in the paper. The field tests in Well Bai 21 and Well Mao 8 are finished. Finally,the paper sums up the experience,points out the problems and gives some suggestion also. This technology can prevent the formation damage in the large extent and protect the reservoir effectively.