致密气藏压裂井合理配产及稳产能力研究

发布时间：2018-05-05 21:31

本文选题：致密气藏 + 非达西渗流　；参考：《西南石油大学》2015年硕士论文

【摘要】：近些年来,国内外加大了对致密气勘探开发的重视程度,其在天然气探明储量中所占的比例越来越高,已成为我国天然气产量的主要来源之一。与常规气藏相比,致密气藏的储层物性差、自然产能低,通常采用水力压裂等增产措施提高产气量,而且气井的工作制度、稳产期的长短在一定程度上决定着实际生产效果。因此,对致密气藏压裂后气井的合理配产和稳产能力的研究就成为准确把握气井生产动态、高效开发致密气藏的重要一环。本文在大量调研国内外相关参考文献的基础上,针对渗流机理、产能预测方法、合理配产及稳产能力进行了研究。首先,在对致密气藏渗流机理的调研中认识到地层中存在一定程度的滑脱现象,基质和裂缝中具有不同程度的应力敏感性以及近井筒地带的高速非达西效应。在此基础上,本文引入拟压力和椭圆坐标系下的拉梅系数,运用势的叠加原理、保角变换和当量井径理论,分别建立了压裂直井和压裂水平井的产能模型。通过实例对产能模型进行了验证,并对诸多产能影响因素进行了敏感性分析。其次,在分析经验法、系统分析曲线法、采气曲线法以及携液计算法对气井配产原理的基础上,结合产能预测模型和井筒压力计算模型对压裂气井进行了合理的配产。最后,运用流动物质平衡法、产量累积法、井口压力递减法以及压降法计算出各压裂气井的单井控制储量,并采用无阻流量法和物质平衡方程法对压裂气井在不同配产和稳产末期井口压力下的稳产能力进行了分析。本文的研究成果对致密气藏压裂直井和压裂水平井产能的预测、合理配产与稳产能力的研究提供的一定的理论指导和技术支持,这对气田制定合理的勘探开发政策提供了相应的依据,也对同类气藏的开发具有一定的参考价值。
[Abstract]:In recent years, more and more attention has been paid to the exploration and development of dense gas, which has become one of the main sources of natural gas production in China. Compared with conventional gas reservoirs, tight gas reservoirs have poor physical properties and low natural productivity. Hydraulic fracturing is usually used to increase gas production, and the working rules of gas wells and the length of stable production period determine the actual production results to a certain extent. Therefore, the study of reasonable distribution and stable production ability of gas wells after fracturing in tight gas reservoirs becomes an important part of accurately grasping the production performance of gas wells and developing tight gas reservoirs efficiently. Based on a large number of references at home and abroad, the seepage mechanism, productivity prediction method, rational production allocation and stable production capacity are studied in this paper. Firstly, in the investigation of the seepage mechanism of tight gas reservoirs, it is recognized that there exists a certain degree of slippage in the formation, the stress sensitivity in matrix and fracture and the high speed non-Darcy effect near the wellbore zone. On this basis, this paper introduces the Lamy coefficient under quasi pressure and elliptical coordinate system, using the superposition principle of potential, conformal transformation and equivalent diameter theory, respectively, establishes the productivity models of fracturing straight wells and fracturing horizontal wells. The productivity model is verified by an example, and sensitivity analysis of many factors affecting productivity is carried out. Secondly, on the basis of analyzing experience method, systematic analysis curve method, gas recovery curve method and liquid carrying calculation method to the principle of gas well distribution production, combined with productivity prediction model and wellbore pressure calculation model, reasonable distribution production of fractured gas well is carried out. Finally, the single well controlled reserves of each fracturing gas well are calculated by using the flowing material balance method, the production accumulation method, the wellhead pressure decline method and the pressure drop method. The unobstructed flow method and material balance equation method are used to analyze the stable production capacity of fractured gas wells under different wellhead pressure at the end of stable production. The research results in this paper provide certain theoretical guidance and technical support for the prediction of productivity of fracturing straight wells and fracturing horizontal wells in tight gas reservoirs and the study of reasonable production allocation and stable production capacity. It provides the corresponding basis for the formulation of reasonable exploration and development policies for gas fields, and also has certain reference value for the development of similar gas reservoirs.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE331

【参考文献】