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- 저자 : Shenglai Yang (검색결과 3 건)
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Experimental study on timing and pattern of gas injection in low permeability reservoir
Wei Huang,Shenglai Yang,Meng Chen,Zhipeng Qiu,Can Chen,Hao Chen 한국자원공학회 2014 Geosystem engineering Vol.17 No.3
Experiments were conducted to study the selection of development methods for low permeability reservoir exploitation after water drive, including the effects of different gas injection cycle times and different injection modes on oil displacement efficiency. Results showed that both gas injection cycle time and injection mode have significant effects on oil displacement efficiency. Based on the results of gas injection cycle time of the displacement with mode shifting to gas drive when water cut reaches 50% and 100%, it can be concluded that in the low permeability reservoir, which is exploited by water drive in the early time, the sooner the gas injection, the higher the oil displacement efficiency is. Because high water saturation can cause serious water-blocking effect, leading to a large amount of trapped oil and low displacement efficiency. Further, in view of the results of water drive, gas injection, and water alternating gas (WAG) flooding, it is obvious that WAG flooding is one of the best methods in enhanced oil recovery. Under the effect of gravity differentiation, WAG flooding can spread to the upper reservoir, which cannot be swept by water drive. Thus, the oil recovery factor can be improved effectively. However, it should be noted that gas injectivity should be considered in the field test.
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Wei Huang,Shenglai Yang,Zhilin Wang,Xiaowei Lv,Hao Lei,Li Chen 한국자원공학회 2014 Geosystem engineering Vol.17 No.6
To improve the ultimate recovery of reservoirs and to increase the economic benefit of oilfields, we feel obliged to study on various factors affecting the development effect of hydrocarbon gas injection and its influence in terms of ultimate recovery. Thus, we can formulate a reasonable and feasible scheme on effective implementation of hydrocarbon gas drive. Take Q28 fault-block as an example; five main factors affecting the development effect of hydrocarbon gas injection have been screened out, four different levels of each influence factor has been set up; the orthogonal experiment method has been adopted to design 16 different combination schemes of 5 factors. Numerical reservoir simulation predicted the final recovery under the different combination schemes. Following are the range analysis and variance analysis of entire results so that the major and minor factors affecting the final recovery and the best range of each factor can be confirmed. The order sequence from major to minor factors: gas injection slug size, gas injection time, gas–water ratio, pressure level, and injection rate. This method is significant on its guidance for hydrocarbon gas injection in this area.
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Numerical simulation of paraffin wax deposition in waxy crude oil reservoir with cold water flooding
Xiangrong Nie,Shenglai Yang 한국자원공학회 2014 Geosystem engineering Vol.17 No.4
The waxy crude oil translates single-phase liquid into two-phase solid–liquid due to paraffin wax deposition, as the temperature of injection water is below wax appearance temperature. The precipitating paraffin wax in the pores affects oil production due to reduction of porosity and permeability. In this paper, a numerical simulation model was established by establishing porous physical model with irreducible water and waxy crude oil under original reservoir condition, introducing a phase transformation equation and combining the mathematical model of a two-phase oil–water seepage field. Several typical characteristics of cooling damage were obtained. The worst cooling damage is not at the injection well wall, but it gradually moves to deep reservoir as injection time increases, while the damage degree gradually increases. The damage degree of injection well wall does not increase with increase in injection time, but remains constant. The magnitude and scope of the cooling damage gradually increases and its fluctuation characteristics clearly increases.
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