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通过对刘峁塬区三叠系长8油藏地层物性、岩性等微观性质进行分析、评价,统计分析该区三叠系长8油藏正常注水井与欠注井在宏观与微观上的差别,进而分析出欠注原因。通过对目前成熟应用的注水井增注技术原理进行再分析与评价,在2011年地面增压注水、减阻剂系统降压技术的基础上,2012年主要试验和应用了注水井酸化、氧化剂增注、水力钻孔增注技术等。通过研究,认为刘峁塬区域物性差,基质渗透率低,闭合应力高,天然裂缝不发育或不易开启导致注水门槛压力高,是导致欠注的主要原因。
Based on the analysis of the physical property and lithology of the Triassic Chang 8 reservoir in the Liugewan plateau, the microcosmic properties of the normal injection well and the underfilled well of the Triassic Chang 8 reservoir in the Triassic are evaluated and analyzed. Differences, and then analyze the reasons for the lack of attention. Based on the re-analysis and evaluation of the well-established technology of injection well injection technology in 2011, based on the ground pressurized water injection and anti-drag agent system depressurization technology in 2011, the main test and application of water injection well acidification and oxidant increase Note, hydraulic drilling technology and so on. According to the research, it is considered that the main cause of under-injection is the poor physical properties of Liuzangyuan area, low permeability of matrix, high closure stress, and natural cracks which are not developed or difficult to open and cause high threshold pressure of water injection.