井壁净化完井液配方体系优选及现场应用

发布时间：2018-08-17 09:27

【摘要】：油田开发中完井液工艺技术作为保护储层的重要技术,对油气井的稳产、增产发挥重要作用。吐哈油田现有的完井液工艺技术能够在完井过程中有效保护储层、提高产量,但是由于完井液配方中没有加入清除泥饼的处理剂,完井液油溶率不高,因此不能有效清除井壁泥饼,阻碍了产层空隙和井眼的连通,没有将完井液保护储层的性能完全发挥出来。因此,在现有技术的基础上,需要优化完井液清除泥饼的性能,完善完井液配方和工艺技术措施。本文通过分析吐哈油田钻井液处理剂以及钻井液滤饼性质,对滤饼清除机理进行了深入研究。通过实验筛选出酸性有机螯合剂S2作为滤饼清除剂,能够有效溶蚀水平井钻井液形成的滤饼,加量为0.5%时,滤饼失重率可达到21.9%。优选缓蚀剂HS1,加量3%,完井液对N80钢片的腐蚀速率为0.097mm/a,有效降低了对钻具以及井下工具的腐蚀。筛选评价出油溶性暂堵剂ZD1,油溶率大于90%。完井液对岩心渗透率恢复率达到90.2%以上,能够有效保护储层。该完井液体系在吐哈鲁克沁油田和雁木西油田应用11井,现场施工无复杂发生,现场实施有效率100%,平均初期产量较邻井分别提高了21.8%和8.1%。新型完井液应用滤饼清除技术能够有效清除附在井壁上的滤饼,打开储层孔隙和井筒的连通通道,提高油层渗透率,能够积极有效地保护储层,大幅度减少完井过程中对产层的损害,对提高新井产量具有现实意义。
[Abstract]:As an important technology for reservoir protection, completion fluid technology plays an important role in stabilizing production and increasing production of oil and gas wells in oilfield development. The existing completion fluid technology in Turpan-Hami Oilfield can effectively protect the reservoir and increase the production rate during the completion process. However, due to the fact that the mud cake removal agent is not added to the completion fluid formulation, the oil solubility of the completion fluid is not high. Therefore, the mud cake of well wall can not be effectively cleared, which hinders the connection between the voids and boreholes, and does not give full play to the performance of the completion fluid to protect the reservoir. Therefore, on the basis of prior art, it is necessary to optimize the performance of mud cake removal from completion fluid and improve the formulation and technical measures of completion fluid. In this paper, the mechanism of filter cake removal is studied by analyzing drilling fluid treatment agent and filter cake properties of Tuha Oilfield. The acid organic chelating agent S2 as filter cake scavenger can effectively dissolve the filter cake formed by horizontal well drilling fluid. The weight loss rate of filter cake can reach 21.9when the addition amount is 0.5. The corrosion rate of completion fluid to N80 steel sheet is 0.097 mm / a, which can effectively reduce the corrosion of drilling tools and downhole tools. The oil soluble temporary plugging agent ZD 1 was screened and evaluated, and the oil solubility rate was greater than 90%. The recovery rate of completion fluid to core permeability is more than 90.2%, which can effectively protect reservoir. The completion fluid was applied in 11 wells in Tuha Lukeqin oilfield and Yanmuxi oil field. There was no complex field operation, and the efficiency was 100. The average initial production increased by 21.8% and 8.1% respectively compared with the adjacent wells. The application of filter cake cleaning technology to the new well completion fluid can effectively clear the filter cake attached to the well wall, open the connection channel between the reservoir pores and the wellbore, improve the reservoir permeability, and protect the reservoir actively and effectively. It is of practical significance to greatly reduce the damage to the production zone during completion and to improve the production rate of the new well.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE257.6

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