Abstract
Offshore oil multi-platform interconnected power system is developing rapidly. The proposal of an effective economic evaluation method that fits the actual production situation of offshore oilfields is very meaningful for the planning and construction of multi-platform interconnected power systems. This article proposes the electric depreciation, depletion, and amortization (DD&A) barrel oil cost S and maximum expected benefit per unit power generation Ie as economic indicators, considering the actual production characteristics and life cycle of the oil field. In order to build a complete economic evaluation system, this article also introduces the N−1 pass rate ηN−1, voltage qualification rate γ, power supply reliability ASAI (Average Service Availability Index), and other reliability indicators to evaluate the offshore power system. When calculating the weight of the indicators, analytic hierarchy method (AHP) was applied to calculate subjective weights, and an entropy method was applied to calculate objective weights. To unify the two weights, the ideal point method is proposed to obtain compound weights. Finally, this article selects an offshore oil field in Bohai Bay, China as example, and analyses short-term small-scale, long-term large-scale, and actual power system as calculation examples in different planning periods. The analysis result verifies the effectiveness of the economic evaluation method.
Highlights
The offshore oil and gas field multi-platform interconnected power system is a main and common power system built on the sea
The different indicator weights determined by the economic evaluation system show that the electrical DD&A barrel oil cost and the expected benefit per unit power generation account for a large proportion in the economic evaluation system
Because of the large difference in power investment and network loss between different grid topologies, oil production cost is an important measure of the efficiency of oilfield production
Summary
The offshore oil and gas field multi-platform interconnected power system is a main and common power system built on the sea. Its power generation energy mainly comes from oil and natural gas extracted by the offshore oil and gas field platform. The offshore multi-platform interconnected power system has small capacity and small spare capacity, poor power supply reliability, high maintenance costs, and difficulty in starting large-scale equipment. If existing power station resources can be integrated, the power system can be planned uniformly; it can improve system reliability, reduce system reserve capacity, and promote the economic and effective development of oil and gas fields [1,2,3]. It is necessary to propose a multi-platform interconnected power system economic evaluation method that fits the actual production conditions of offshore oil fields.
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