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the optimal cost
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    The corresponding application software was developed and used to determine the optimal cost and adding amount of those agents with the expected properties.
    利用编制的相应应用程序,可计算出达到应用者期望的油气井工作液性能时处理剂的最少加量和对应的工作液单位成本。
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  the optimal cost
The optimal cost set was selected by use of both character-based and topological congruence measures.
      
The optimal cost target was evaluated and the original pinch rules at each subsystem were employed.
      
In this paper, we have formulated the optimal cost stacked uni-directional path switched (UPSR) ring design problem.
      
The estimated cost function is then used to approximate the optimal (cost-minimizing) industry structure for petroleum refining.
      
A basic result is that the optimal average costs per unit time for the physical problem converge to the optimal cost per unit time for the limit stationary process as the number of sources and the time interval goes to infinity.
      
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The bit type selection is very important to increase drilling speed and reduce costs of drilling in the course of drilling.In this paper,three ways of optimizing bits are put forward under a lot of data in X oilfield,which are the optimal cost selection,the interval transit time way and the rock-property way.These ways have important significance to decrease cost.

钻井过程中钻头类型的选择对于提高钻井速度、降低钻井成本非常重要。基于X油田丰富的原始数据提出了最优成本法选型、声波时差法选型和岩石物性法选型 3种方法 ,这对该油田加快勘探开发步伐 ,降低钻井成本具有重要意义。

In order to reduce the cost of working fluids in oil and gas wells, the lower-price agents can be used to treat wells. For the performance demand, more agents need be added into wells,and so the effect of reduced cost is unobvious. It is preferable to utilize mathematical model to reduce cost of working fluids, according to the property of multiple functions for some agents. Experimental data of the properties of working fluids and concentrations of two agents were obtained. The mathematical formulas of tested...

In order to reduce the cost of working fluids in oil and gas wells, the lower-price agents can be used to treat wells. For the performance demand, more agents need be added into wells,and so the effect of reduced cost is unobvious. It is preferable to utilize mathematical model to reduce cost of working fluids, according to the property of multiple functions for some agents. Experimental data of the properties of working fluids and concentrations of two agents were obtained. The mathematical formulas of tested data and optimization models were established with the non-linear least-square method. The corresponding application software was developed and used to determine the optimal cost and adding amount of those agents with the expected properties. The application cases show that the new cost control method is successful for reducing cost of working fluids in oil and gas wells.

为了控制油气井工作液成本,可采用低价格的处理剂。但为了达到工作液的性能要求,其处理剂加量较大,因而其成本降低不明显。根据油气井工作液部分处理剂具有多种功能这一特性,在室内测定了采用两种处理剂时的加入量与油气井工作液性能的实验数据,根据数据分布为二次曲面的特点,运用非线性多元最小二乘法及优化理论,建立了试验数据数学关系式和优化模型。利用编制的相应应用程序,可计算出达到应用者期望的油气井工作液性能时处理剂的最少加量和对应的工作液单位成本。经多次现场应用,这种控制成本的新方法,经济效益显著。

 
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