Study On Economic Benefit With Multilateral Wells Of Bo-hai Marginal Oil Field

With the oil field developing, the particular geologic setting and the adopted explortation technology are the two major factors influencing the economic benefit of oil field. During the development of marginal oil field, the advanced technology should be used to develop the marginal oil field in order to gain the bigger economic values. The multilateral wells technology can not only uttermost link up the heavy oil reservoirs and boost the oil recovery level but also reduce the total cost of exploiting the oil reservoir.In view of the rheological property of the heavy oil in Bo-hai field, this paper deduces the multilateral wells'production model of Non-Newtonian Bingham fluid with equiangular transformation method. In view of the multilateral wells Bo-hai, the paper analyses the multilateral wells'capitalized cost composition, including pre-drilling engineering, drilling engineering, completion engineering and production engineering. It also constructs the multilateral wells'economic benefit models basing on net present value, inner rate of return and payback period. Basing on the models, the paper compiles the economic evaluation programming of the multilateral wells. Verifying the production model with an example, it concludes that the numerical faults is 2.2% comparing the theoretical figure with the actual figure, which proves it feasible with the deducing production model to calculate the output of multilateral wells in heavy oil reservoir. Comparing production of the multilateral well with productivity of vertical well, the former is seven times more than the latter, which illustrates the multilateral wells technology can greatly increase the output and economic benefit of marginal field. With an example of Bo-hai field, the practicability of the programming is verified. This paper provides theoretical analysis reference for studying the economic feasibility of the multilateral wells.