什邡气田蓬莱镇组井壁稳定性研究

发布时间：2018-04-30 19:10

本文选题：什邡气田 + 蓬莱镇组　；参考：《成都理工大学》2015年硕士论文

【摘要】：什邡气田蓬莱镇组天然气资源量巨大,具有广阔的勘探开发前景。但由于地质条件复杂,储层非均质性强,泥页岩易坍塌,且天然裂缝发育,导致一系列井下复杂问题的发生,严重影响了钻井工程的进度,制约了整个蓬莱镇组气藏勘探开发工作。因此,急需开展研究区目的层相关研究,为合理开发蓬莱镇组气藏提供科学的技术支持。本文以石油地质学、构造地质学、地球物理测井、岩石力学与工程、油气藏工程及钻井工程的理论和方法为基础,在深化工区工程地质特征认识基础上,结合前期研究成果,系统分析了岩石力学、地层孔隙压力、地应力、坍塌压力、破裂压力等参数及特征,对什邡气田蓬莱镇组井壁稳定性特征进行了综合分析。论文在全面收集整理钻井、测井、测试及储层改造等相关资料的基础上,通过实验和地球物理测井资料相结合的办法建立了岩石力学参数预测模型及剖面。利用Eaton法建立了地层孔隙压力预测模型及剖面。利用工区周边成像测井资料及微地震资料分析明确蓬莱镇组最大水平地应力方向为近东西向。在优选井壁失稳准则基础上,建立什邡气田地层坍塌压力、破裂压力预测模型及相应剖面,开展有针对性的井壁稳定性分析,什邡地区坍塌压力随深度增加而增大,蓬莱镇组及以上地层坍塌压力均小于地层孔隙压力,以地层孔隙压力设计的钻井液密度能够维持井壁稳定。破裂压力在2.39~3.31MPa/100m之间,远高于地层坍塌压力和地层孔隙压力,基本上不存在钻井液压破地层发生漏失的情况。同时,结合分析所得数据,提出适合工区的钻井工艺技术对策,为钻井工程设计及施工提供了基础依据。论文取得的各项研究成果服务后续钻完井工程作业,将有效减少井下工程状况,提高钻井效率,缩短钻井周期,降低钻采成本,对实现什邡气田蓬莱镇组天然气高效勘探开发具有重要的现实意义。
[Abstract]:The gas resource of Penglai Zhen formation in Shifang gas field is huge and has broad prospect of exploration and development. However, due to complex geological conditions, strong heterogeneity of reservoir, easy collapse of shale and development of natural fractures, a series of complex downhole problems occurred, which seriously affected the progress of drilling engineering. It restricts the exploration and development of the gas reservoir in Penglai Zhen formation. Therefore, it is urgent to carry out relevant research on target layer in the research area to provide scientific and technical support for the rational development of gas reservoirs in Penglai Zhen formation. This paper is based on the theories and methods of petroleum geology, tectonic geology, geophysical logging, rock mechanics and engineering, oil and gas reservoir engineering and drilling engineering. The parameters and characteristics of rock mechanics, formation pore pressure, ground stress, collapse pressure and fracture pressure are systematically analyzed, and the characteristics of wellbore stability of Penglai Zhen formation in Shifang gas field are comprehensively analyzed. On the basis of collecting and sorting relevant data such as drilling, logging, testing and reservoir modification, the prediction model and profile of rock mechanics parameters are established by combining experimental and geophysical logging data. The prediction model and profile of formation pore pressure are established by using Eaton method. The maximum horizontal geostress direction of Penglai Zhen formation is found to be near east-west direction through the analysis of peripheral imaging logging data and microseismic data. On the basis of the criteria of optimal selection of wellbore instability, the formation collapse pressure, fracture pressure prediction model and corresponding profile of Shifang gas field are established, and targeted wellbore stability analysis is carried out. The collapse pressure increases with the increase of depth in Shifang area. The formation collapse pressure of Penglai Zhen formation and above is smaller than that of formation pore pressure, and the density of drilling fluid designed by formation pore pressure can maintain the wellbore stability. The fracture pressure between 2.39~3.31MPa/100m is much higher than the formation collapse pressure and pore pressure. At the same time, combined with the data obtained from the analysis, the paper puts forward the technical countermeasures of drilling technology suitable for the working area, which provides the basic basis for the drilling engineering design and construction. The research results obtained in this paper will effectively reduce downhole engineering condition, improve drilling efficiency, shorten drilling cycle and reduce drilling and production cost. It has important practical significance to realize high efficiency exploration and development of natural gas in Penglai Zhen formation of Shifang gas field.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE21

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