元坝地区高密度低粘降阻钻井液技术研究

发布时间：2018-03-04 10:35

本文选题：钻井液　切入点：高密度　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：元坝地区油气资源丰富,具有很大的勘探开发潜力。由于海相气藏埋藏深,储层物性差异大,渗透率低,地质条件复杂,导致钻井施工难度大,常规钻井液体系难以解决钻井液高固相含量、滤液高矿化度、性能不稳定、滤失量过高等技术难题,必须使用高密度钻井液才能保证正常钻进,而深井、超深井井下温度和压力高,地层复杂,各种污染如酸性气体、高矿化度地层水、固相等对高密度钻井液体系的破坏等均会造成其稳定性下降,进而造成比较突出的流动性问题,同时,高密度钻井液对与之相匹配的润滑剂性能要求很高,因此有必要开展高密度低粘降阻钻井液技术研究。本文首先对高密度低粘降阻钻井液作用机理进行了研究,分析了高密度低粘降阻钻井液润滑机理,给出了高密度低粘降阻钻井液润滑性能评价指标,阐明了高密度低粘降阻钻井液解决的问题,同时分析了钻井液润滑性的主要影响因素,并介绍了钻井液用润滑剂种类;然后对高密度低粘降阻钻井液体系进行了优选和评价,分别筛选和评价了抑制稀释剂、低粘降滤失剂,对液体润滑剂在5%博友土浆中润滑性能进行了评价。在以上研究的基础上,对给出了高密度低粘降阻钻井液体系配方,并进行了室内评价实验,得到了很好的效果,并进行了现场试验,满足了实际钻井过程中对钻井液性能的要求。
[Abstract]:The Yuanba area is rich in oil and gas resources and has great potential for exploration and development. Due to the deep burial of marine gas reservoirs, great differences in reservoir physical properties, low permeability and complicated geological conditions, drilling construction is very difficult. The conventional drilling fluid system is difficult to solve the problems of high solid content of drilling fluid, high salinity of filtrate, unstable performance, and high technical problem of filtration loss, so it is necessary to use high density drilling fluid in order to ensure normal drilling, while in deep wells, The high temperature and pressure in ultra-deep wells, complex formation, various pollution such as acid gas, high salinity formation water, solid phase and so on will cause the stability of the drilling fluid system to decline, and then cause the more prominent fluidity problem. At the same time, high density drilling fluid requires high performance of matching lubricant, so it is necessary to study the technology of high density and low viscosity reducing resistance drilling fluid. Firstly, the mechanism of high density and low viscosity reducing resistance drilling fluid is studied in this paper. The lubrication mechanism of high density and low viscosity reduced resistance drilling fluid is analyzed, the evaluation index of high density low viscosity drop resistance drilling fluid is given, and the problem of high density low viscosity reducing resistance drilling fluid is expounded. At the same time, the main influencing factors of the lubricity of drilling fluid are analyzed, and the kinds of lubricant used in drilling fluid are introduced, then the high density and low viscosity reducing resistance drilling fluid system is selected and evaluated, and the inhibiting diluent is screened and evaluated respectively. The lubricity of liquid lubricant in 5% Boyou slurry was evaluated by low viscosity filtration reducer. Based on the above research, the formula of high density and low viscosity reducing resistance drilling fluid system was given, and the laboratory evaluation experiment was carried out. Good results are obtained and field tests are carried out to meet the requirements of drilling fluid performance in the actual drilling process.
【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】：TE254

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