低渗储层水平井分段压裂优化研究

发布时间：2018-01-07 01:07

本文关键词：低渗储层水平井分段压裂优化研究　出处：《长江大学》2015年硕士论文　论文类型：学位论文

【摘要】：水平井分段压裂技术是低渗储层得以成功开发的关键。深入了解水力压裂控制机理及其影响因素有利于提高水力压裂的效果,从而提高低渗储层开发的经济效果。在水力压裂过程中,近井地带裂缝挠曲会极大降低油气井产能。本文通过分析三种岩石破裂模型,并分析了不同条件下的裂缝延伸规律,通过与现场监测所得数据进行对比分析,得出了裂缝启裂角预测最适标准,并基于该标准对影响裂缝延伸的敏感性因素进行了分析,得出了裂缝在不同地应力各向异性、断裂韧性和泊松比条件下的延伸趋势。在水力压裂过程中,准确预测破裂压力梯度是水力压裂成功的关键因素之一。在前人的研究中,由于忽略了天然裂缝等因素对压裂的影响,使得预测得到的破裂压力梯度往往高于实际值。本文通过研究岩石的机械性质,并以此为基础建立了储层岩石可压裂性评价模型,通过研究岩石的脆性、断裂韧性、应力强度因子比之间的关系对岩石的可压裂性进行预测,从而筛选出储层合适的可压裂点,从而提高压裂效率。最后,本文通过综合储层岩石的可压裂性评估,以x1井为例对其进行了压裂优化设计,在充分考虑储层地质条件的前提下将原方案中的10级压裂减为9级,不仅降低了非生产作业时间,同时也降低了生产成本。通过模拟研究表明,该优化使得X1井产量提高了20%,具有良好的经济效益。本研究在综合考虑岩石破裂、裂缝挠曲、裂缝启裂角预测和水力压裂启裂位置选择的基础上,通过理论模型研究和数值模拟验证了其预测的可靠性,有助于提高现场水力压裂的有效性。
[Abstract]:Horizontal well fracturing technology is the key to the success of the development of the reservoir of low permeability. Understand the hydraulic fracturing control mechanism and its influencing factors is helpful to improve the effect of hydraulic fracturing in low permeability reservoir, so as to improve the economic effect of development. In the process of hydraulic fracturing, near wellbore cracks deflection will be greatly reduced by the oil and gas well productivity. Analysis of three kinds of rock fracture model, and analyzes the regularity of crack extension under different conditions, by comparing with the data obtained from field monitoring, the crack initiation angle prediction optimal standard, and based on the standard sensitivity factors influence on crack extension is analyzed, the cracks in different stress anisotropy, fracture the toughness and Poisson's ratio of the extension trend conditions. In the process of hydraulic fracturing, the accurate prediction of fracture pressure gradient is one of the key factors of success. On the basis of previous hydraulic fracturing The study, due to the neglect of the influence of natural factors on crack fracturing, so the prediction of fracture pressure gradient are often higher than the actual value. The mechanical properties of the rock, which is established on the basis of reservoir rock fracturing of the evaluation model, through the study of rock brittleness, fracture toughness, stress intensity between the rock factor ratio can be predicted, so as to select the suitable reservoir fracturing, so as to improve the efficiency of fracturing. Finally, through a comprehensive evaluation of the reservoir rock fracturing, from X1 well fracturing optimization design for the example, in consideration of the geological conditions of reservoir the original plan in 10 stage fracturing reduced to 9 level, not only reduces the non production time, but also reduce the production cost. The simulation results show that the optimization makes X1 well production increased by 20%, with good Good economic benefits. The research in the comprehensive consideration of rock rupture, crack deflection, crack initiation angle based prediction and location selection of hydraulic fracturing initiation, the reliability of prediction model is verified by theoretical research and numerical simulation, is helpful to improve the field of hydraulic fracturing is effective.

【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.1

【相似文献】