长7致密油藏水平井开发动态分析

发布时间：2018-04-13 13:22

本文选题：长7致密油藏 + 体积压裂　；参考：《西安石油大学》2017年硕士论文

【摘要】：近年来,随着对鄂尔多斯盆地延长组勘探程度不断深入,发现长7储层显示出了较大的资源潜力和开发前景,是鄂尔多斯盆地重要的接替层系。研究区长7储层属于三角洲沉积体系中的三角洲前缘亚相沉积,属于特低超低渗储层。这类“低品质”油藏表现为流体渗流规律为非达西渗流,存在启动压力梯度,开发过程中产能递减速率快等特点。给经济高效的开采该类油田带来了巨大困难。针对超低渗透油藏流体渗流属于非达西渗流的特点,需要启动压力梯度,在衰竭式开发的方式下,提出体积压裂是一种改善油藏开发效果的有效增产开发模式。针对产能递减速率快的特点,进行产能递减影响因素分析。本文以安83井区长7油藏为例分析长7致密油藏水平井开发动态的重要实际应用价值。论文在研究安83井区长7油藏特征的基础上,进行储层综合评价,利用油藏工程理论,线性回归理论,裂缝参数模型,结合安83井区现场试验数据,并经过实例分析,对长7储层在衰竭式开采的情况下进行了裂缝与井网参数关系分析、单井控制储量计算、产能预测和产能递减规律及影响产能递减速率因素的分析,最终确立了各参数的合理界限。本文对提高超低渗透油田油井产量,经济高效开发超低渗透油藏具有较好的指导意义,对整个鄂尔多斯盆地油区超低渗油田的合理开发,改善油藏规模效益都具有十分重要的借鉴价值和指导意义。
[Abstract]:In recent years, with the deepening exploration of Yanchang formation in Ordos Basin, it is found that Chang 7 reservoir shows great resource potential and development prospect, which is an important succession of strata in Ordos Basin.Chang7 reservoir in the study area belongs to delta front subfacies in delta sedimentary system and belongs to ultra-low ultra-low permeability reservoir.This kind of "low quality" reservoir is characterized by non-Darcy percolation, which has the characteristics of starting pressure gradient and rapid productivity decline rate during development.It brings great difficulties to the economic and efficient exploitation of this kind of oil fields.In view of the non-Darcy percolation characteristic of fluid percolation in ultra-low permeability reservoir, it is necessary to start up pressure gradient. Under the mode of exhaustion development, volume fracturing is an effective stimulation and development mode to improve reservoir development effect.According to the characteristics of rapid productivity decline rate, the factors affecting productivity decline are analyzed.This paper takes Chang7 reservoir in An83 well area as an example to analyze the important practical application value of horizontal well development performance in Chang7 compact reservoir.On the basis of studying the characteristics of Chang 7 reservoir in an 83 well area, the reservoir comprehensive evaluation is carried out. The reservoir engineering theory, linear regression theory, fracture parameter model and field test data of an 83 well area are used in this paper.The relationship between fracture and well pattern parameters, calculation of controlled reserves of single well, prediction of productivity, law of productivity decline and factors affecting productivity decline rate are analyzed for Chang7 reservoir under the condition of exhausted production.Finally, the reasonable limit of each parameter is established.This paper has good guiding significance for improving oil well production in ultra-low permeability oil field and developing ultra-low permeability reservoir economically and efficiently. It is also useful for rational development of ultra-low permeability oil field in the whole oil area of Ordos Basin.Improving reservoir scale benefit has very important reference value and guiding significance.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE331

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