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Numerical Simulation Study on the Development Parameters Optimization of CO2 Huff and Puff in Yushulin Oilfield

Author: ZhanFei
Tutor: SongKaoPing
School: Northeast University of Petroleum
Course: Oil and Gas Field Development Project
Keywords: CO2 huff and puff numerical simulation parameter optimization soak time orthogonal design
CLC: TE348
Type: Master's thesis
Year: 2011
Downloads: 130
Quote: 0
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Abstract


Yushulin oilfield had characteristics of low formation energy, inactive edge and bottom water. Even the injection-production ratio kept as a high level in previous development stage, the production declined sharply, the well output decreased continuously, the effect of water flooding was poor and recovery degree was low because of high injection pressure and poor ability of absorbing water. There were still considerable single well control reserves and difficult producing reserves, which have not been put into production effectively. Consequently, carrying out CO2 huff and puff turned to be one of the most effective methods to enhance the recovery efficiency of Yushulin oilfield.This paper took Shu-16 block of Yushulin oilfield as an example. On the basis of analyzing the affecting factors of CO2 huff and puff such as oil saturation, water cut, reservoir thickness, permeability, porosity, bottom flowing pressure and so on, we have determined reasonable weight of each single factor by using the analytical hierarchy process and optimized wells and layers which were suit for CO2 huff and puff of Shu-16 block according to the fuzzy comprehensive evaluation. And then, the fine geological modeling of Shu-16 block was established basing on the results of selecting wells and layers. The water flooding history matching and the numerical simulation study of optimizing parameters of CO2 huff and puff have also been completed by applying the module PVTi and E300 of Eclipse The results showed that well 11Y67-611 could achieve the best effect with adopting parameters combination of the 80 m3/d of injection rate, 100 m3 of injection volume and 30 days of soak time to product two cycle, the oil increment and the oil-draining rate were separately 101.31 m3 and 1.01 m3·m-3. Well 11Y69-56 could achieve the best effect with adopting parameters combination of the 60 m3/d of injection rate, 135 m3 of injection volume and 30 days of soak time to product three cycle, the oil increment and the oil-draining rate were separately 154.38 m3 and 1.14 m3·m-3.In the end, based on single well model of CO2 huff and puff, six factors and three levels numerical program was orthogonally designed mainly considering the permeability, net thickness, porosity, oil saturation, injection volume of CO2, injection rate of CO2. On the base of analyzing the importance of these affecting factors to CO2 huff and puff, the relationship between the soak time and five prominent factors of the permeability, injection volume, porosity, oil saturation, and injection rate was gained by adopting the method of multivariate linear regression. The results of F test, goodness of fit test and example text of CO2 huff and puff in Yushulin oilfield revealed that regression equation had highly forecasting accuracy.This paper provided theoretical reference for Yushulin oilfield to carry out CO2 huff and puff with its parameters optimization and setting the general module of reasonable soak time in the Shu-16 block of Yushulin oilfiled.

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CLC: > Industrial Technology > Oil and gas industry > Oil and gas development and mining > Oil field development ( reservoir engineering ) > Low-permeability oil field development
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