So it is crucial to establish comprehensive evaluation and programming model as to improve the capacity of marginal field development of Chinese oil companies.
因此，积极探索边际油气田开发的综合评价和规划模型，对于提高我国的石油天然气公司边际油田的开发能力具有非常重要的实际意义。
With vertical pipe shield and underwater pile-foundation, a protection frame for wellhead is designed for the development of offshore marginal field.
设计了一种适用于海上边际油气田开发的垂直护管水下桩基式井口保护架。
In the middle-late stages of production, as the deepening of the oil field development, the marginal operation output decrease, the cost increases, and the investment increase, too.
在油田开采中后期，随着油田开发程度的加深，措施作业边际产量递减，措施作业边际费用递增，措施作业增量边际成本递增。
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