早期注聚油田射孔组合方式优化研究
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摘要
不同射孔组合方式是指在同一注采单元内的采油井和注水井,射开相同或不同程度的储层有效厚度,从而影响油水运动规律的注采组合方式。为明晰早期注聚油田在不同射孔组合方式下剩余油分布情况及生产特征,使油田实现更长的稳产时间和更高的采收率,以渤海Z油田为研究对象,依据相似原则,参照油藏实际特征参数,开展了不同射孔组合方式下的水驱和聚驱三维物理模拟实验。实验结果表明,相比于同期水驱,不同射孔组合方式实施早期注聚后,采油速度可提高5. 3～6. 5倍,采收率提高1. 3～1. 4倍。当注水井上部射开、采油井全部射开时,水驱和聚驱的剩余油分布最少,驱替程度最高,无水采收期最长,相比于其它射孔组合方式,其稳产期平均延长1. 2倍,水驱采收率提高3. 7%～6. 0%,聚驱采收率提高2. 5%～4. 1%,为推荐射孔组合方式。将研究结果应用到油田实际挖潜调整中,调整井获得了长达2年的稳产期,能够为油田后续滚动扩边提供指导。
Different perforation combination means injection well and production well that located in the same injection-production unit,which perforated the same or the different degree,so as to form the injection-production combination mode to affect the oil and water movement law. In order to clarify the remaining oil distribution law and development performance under different perforation combination mode in early period polymer flooding oilfield,so as to realize the longer stable production period and higher oil recovery. Bohai oilfield Z is taken as target oilfield,according to the similarity principle,the actual characteristic parameters of the reservoir are selected as reference and three dimensional physical laboratory experimental study under different perforation combination mode is carried out. The research result shows that,in contrast to the water flooding at the same period,recovery rate could increase by 5. 3 ～ 6. 5 times for different perforation combination mode,and the ultimate oil recovery increases by 1. 3 ～ 1. 4 times.When the upper part of the injection well is perforated and the production well is fully perforated,the remaining oil distribution of water flooding and polymer flooding is the least,the displacement degree is the highest,and the anhydrous recovery period is the longest. Compared with other perforation combinations,the stable production period is prolonged by an average of 1. 2 times,the water flooding recovery rate is increased by 3. 7 %～ 6. 0 %,and the polymer flooding recovery rate is increased by 2. 5 %～ 4. 1 %,which is the recommended perforation combination. Applying the research results to the actual adjustment of oil field potential tapping,the adjustment wells have achieved a stable production period of up to 2 years,which can provide guidance for the follow-up expansion and adjustment of oil field.
Different perforation combination means injection well and production well that located in the same injection-production unit,which perforated the same or the different degree,so as to form the injection-production combination mode to affect the oil and water movement law. In order to clarify the remaining oil distribution law and development performance under different perforation combination mode in early period polymer flooding oilfield,so as to realize the longer stable production period and higher oil recovery. Bohai oilfield Z is taken as target oilfield,according to the similarity principle,the actual characteristic parameters of the reservoir are selected as reference and three dimensional physical laboratory experimental study under different perforation combination mode is carried out. The research result shows that,in contrast to the water flooding at the same period,recovery rate could increase by 5. 3 ～ 6. 5 times for different perforation combination mode,and the ultimate oil recovery increases by 1. 3 ～ 1. 4 times.When the upper part of the injection well is perforated and the production well is fully perforated,the remaining oil distribution of water flooding and polymer flooding is the least,the displacement degree is the highest,and the anhydrous recovery period is the longest. Compared with other perforation combinations,the stable production period is prolonged by an average of 1. 2 times,the water flooding recovery rate is increased by 3. 7 %～ 6. 0 %,and the polymer flooding recovery rate is increased by 2. 5 %～ 4. 1 %,which is the recommended perforation combination. Applying the research results to the actual adjustment of oil field potential tapping,the adjustment wells have achieved a stable production period of up to 2 years,which can provide guidance for the follow-up expansion and adjustment of oil field.
引文
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[10]文鑫,戴宗,王华,等.海相砂岩油藏长期水驱后储层物性变化规律[J].特种油气藏,2017,24(1):157-161.Wen Xin,Dai Zong,Wang Hua,et al.Physical Properties of Marine Sandstone Reservoir After Long-Term Waterflooding[J].Special Oil and Gas Reservoirs,2017,24(1):157-161.
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[22]殷代印,周轩.应用分步射孔改善油层动用不均匀现象研究[J].石油化工高等学校学报,2016,29(1):41-45.Yin Daiyin,Zhou Xuan.Improvement of Inhomogeneous Producing Degree for Polymer Flooding Layers Applying Step Perforation[J].Journal of Petrochemical Universities,2016,29(1):41-45.
[23]王中,爨莹.射孔完井合理射开程度的数值模拟研究[J].微电子学与计算机,2008,25(1):141-143.Wang Zhong,Cuan Ying.Numerical Simulation Analysis on Reasonable Perforation Degree in Perforated Completion Technique[J].Microelectronics&Computer,2008,25(1):141-143.
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