| With the development of economic, energy sources become more and more important. So many oil fields and gas fields need be developed. Oil and natural gas engineering must come through four phases-----preliminary feasibility study phase, feasibility study phase, conceptual phase, construction documents design phase. Investment estimates of the whole engineering must be made in the first two phases , but the degree of every phase is different. Coarse estimate is needed in preliminary feasibility study phase and detail estimate in feasibility study phase, in which every detail project need be calculated and economic evaluation need be made. Whether the engineering is feasible on economic benefits can be decided by gross investment resulting from the investment estimates of feasibility study phase . General estimate need be made in conceptual phase. Budget making must be made in construction documents design phase. Feasibility study phase is most important in these phases. Advance and rational transmission and distribution engineering frame is put forward after feasibility study, so feasibility of project is overall demonstrated. Incorrect feasibility study will influence the whole engineering and far-reaching designs of country. With computer technology widely popularizing, many software are applied in construction cost field. These software lighten labor amount of technical economy personnel in certain degree. It doesn't free technical economy personnel from cockamamie and repeat work for depending on inputting quota number by person. It still exist long work period and large work amount. Now old methods of investment estimates don't adapt well to the development of the times for wasting many manpower and material resources. It couldn't get good result rapidly with old method when time is limited. This article puts forward a new method of investment estimates system based on . It includes design principle of the system, structure of the system, the function of each module, etc. |
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