Q油田致密储层水平井体积压裂产能预测研究

发布时间：2018-06-18 10:32

本文选题：致密油藏 + 体积压裂　；参考：《东北石油大学》2015年硕士论文

【摘要】：随着石油勘探开发工作的不断深入,人们不断向更低渗透致密储层实际开发迈进。目前特低孔渗的页岩气、页岩油和致密油逐渐成为人们关注的热点,美国的致密油气革命使美国油气实现自给自足,总产量几乎超越沙特阿拉伯。在全球低渗透致密油气藏储量巨大,其合理有效开发具有重大意义。但是致密储层岩性致密,孔渗条件极差,通常发育微裂缝,微观结构极其复杂。油气在其中的渗流已不再符合达西线性定律,而且还具有较强的应力敏感性。致密油气开采通常需要采用水平井压裂技术,采用一般的多级分段压裂已经不能满足有效开发需求,通常还需要进行体积压裂。体积压裂通过整体改造提高储层渗透率,通过在主裂缝延伸出多条分枝裂缝,或连通分散分布的天然微裂缝,最后形成贯通压裂区的复杂裂缝网络。但是这又在致密储层的产能评价上增加了困难,对体积压裂复杂裂缝网络的正确描述和建模成为产能预测的难点,同时压裂水平井整体产能评估也是水平井压裂开发技术的一个难点。因而考虑致密储层特性和体积压裂复杂裂缝网络特征对体积压裂水平井的产能预测具有重要研究意义。本文对Q油田某区块致密砂岩油藏体积压裂水平井产能预测方法进行了研究。通过对Q油田致密区块天然岩心进行流动实验和压力敏感性实验,拟合出了该区块致密储层启动压力梯度和应力敏感性经验公式,采用双重孔隙介质模型建立了体积压裂复杂裂缝网络的裂缝模型,对体积压裂水平井整体产能模型进行了研究,利用数值模拟方法,开发出了一套致密储层水平井体积压裂产能预测程序。利用该程序研究了多个不同地质因素对压裂水平井产能的影响规律。通过对Q油田致密区块数口体积压裂水平井产能预测的具体使用,与实际开发结果比对效果令人满意。
[Abstract]:With the development of petroleum exploration and development, people are moving towards the actual development of lower permeability and denser reservoirs. At present, the extremely low porosity and permeability of shale gas, shale oil and dense oil have gradually become the focus of attention. The American tight oil and gas revolution has made the United States self-sufficient in oil and gas, and its total output is almost higher than that of Saudi Arabia. In the world, the reserves of low permeability tight reservoirs are huge, and its rational and effective development is of great significance. But the lithology of tight reservoir is very tight, the condition of porosity and permeability is extremely poor, the microfracture is usually developed, and the microstructure is extremely complex. The percolation of oil and gas no longer obeys Darcy's linear law and has strong stress sensitivity. In dense oil and gas production, horizontal well fracturing technology is usually used, and general multistage fracturing can not meet the demand of effective development, and volume fracturing is usually needed. Volume fracturing improves reservoir permeability by integral transformation, and forms a complex fracture network through extending multiple branched fractures in main fractures or connecting and distributing natural micro-fractures. However, it is difficult to evaluate the productivity of dense reservoir, and the correct description and modeling of complex fracture network of volume fracturing become the difficulty of productivity prediction. At the same time, the whole productivity evaluation of fractured horizontal well is also a difficulty in fracturing development technology of horizontal well. Therefore, considering the characteristics of tight reservoir and complex fracture network of volume fracturing, it is important to study productivity prediction of horizontal wells with volume fracturing. In this paper, the productivity prediction method of volume fracturing horizontal wells in a compact sandstone reservoir in Q oilfield is studied. Through the flow test and pressure sensitivity experiment of natural core in dense block of Q oilfield, the empirical formulas of starting pressure gradient and stress sensitivity of tight reservoir in this block are fitted. The fracture model of complex fracture network for volume fracturing is established by using dual pore medium model. The whole productivity model of horizontal well with volume fracturing is studied, and the numerical simulation method is used. A set of prediction program for volume fracturing productivity of horizontal wells in dense reservoirs has been developed. The effects of different geological factors on the productivity of fractured horizontal wells are studied by using this program. Through the application of productivity prediction of several volume fracturing horizontal wells in compact blocks of Q oilfield, the comparison with actual development results is satisfactory.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE328

【参考文献】