Based on the multivariable random drilling model, the multi objective reliability optimization of deep well drilling parameters is presented.

在多元随机钻井模式理论的基础上，提出了深井钻井参数多目标可靠性优化方法。

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With that in mind, the Environmental Defense Fund, Southwestern Energy and other progressive gas producers and environmental groups are working to develop a model regulatory framework for safe drilling that can serve as the foundation for better operations.

WSJ: Is Natural Gas the Road to a Clean Energy Future?