海洋深水油基钻井液的研究

发布时间：2018-03-23 10:29

本文选题：深水油基钻井液　切入点：流变性　出处：《东北石油大学》2015年硕士论文

【摘要】：随着钻井技术的快速进步和对海洋石油资源认知水平的不断增长,目前的海洋油气勘探开发已走向深海以及超深海。深水钻井的作业十分复杂,深水钻井液面临许多困难,例如在不同温度范围下钻井液的流变性控制,低温高压下的气体水合物问题,高温高密度下加重材料沉降问题,以及窄压力窗口下钻井液漏失问题等。因此开发海洋深水钻井液迫在眉睫。油基钻井液相比水基钻井液具有更好的的抗温性和可控的流变性能,电稳定性好,抗钻屑、抗水污染能力强,窄压力窗口条件下能够保持良好的沉降稳定性和滤失性,所以选择油基钻井液作为海洋深水钻井液是最好选择。本文首先对深水油基钻井液技术进行调研,并对油基钻井液处理剂进行分析,通过机理分析及实验验证筛选出性能最佳的几种关键处理剂;其次考察了不同条件对油基钻井液流变性的影响规律,通过单剂评价、体系评价两种方法对处理剂加量及配比进行调整,选出最优处理剂加量,并且复配了乳化剂,以及制备了有机土和流型调节剂两种关键处理剂,其中合成乳化剂在体系中电稳定性能较强,流型调节剂可满足低温下深水油基钻井液流变性能的调整,并且能够提高钻井液切力;最后,完成深水油基钻井液的最优配方,本深水油基钻井液具有低粘高切,宽温度及压力范围下流变性恒定,抗钙土、海水污染能力强等特点,能够满足深水高温高压井的作业,为深水井的勘探开发提供理论支持和技术保证。最终配方:基液(185V气制油)+1%主乳化剂(SP-80+硬脂酸钙)+0.8%辅助乳化剂(OP-10)+2%自制有机土+1%流型调节剂+1.2%润湿剂(WET-L)+3%降滤失剂(HFR-L)+2.5%氧化钙+25%饱和氯化钙溶液+重晶石,油水比为8:2。
[Abstract]:With the rapid progress of drilling technology and the increasing level of understanding of offshore oil resources, the current offshore oil and gas exploration and development has moved to the deep sea and ultra-deep-sea. The operation of deep-water drilling is very complex, and the deep-water drilling fluid is facing many difficulties. For example, the rheological control of drilling fluid at different temperatures, the gas hydrate problem at low temperature and high pressure, the aggravation of material deposition at high temperature and high density, Oil based drilling fluid has better temperature resistance and controllable rheological performance than water-based drilling fluid, and has good electrical stability and anti-drilling debris, so it is urgent to develop offshore deep water drilling fluid under narrow pressure window. Under the condition of narrow pressure window and strong water pollution resistance, the oil based drilling fluid is the best choice, so it is the best choice to select the oil based drilling fluid as the deep water drilling fluid. Through mechanism analysis and experimental verification, several key additives with the best performance are selected. Secondly, the influence of different conditions on the rheological properties of oil-based drilling fluid is investigated, and the single agent is used to evaluate the rheological properties of the oil based drilling fluid. Two methods of system evaluation were used to adjust the dosage and proportion of the treatment agent, and the optimal dosage of the treatment agent was selected, and the emulsifier was mixed, and two kinds of key treatment agents, organic soil and flow regime regulator, were prepared. The synthetic emulsifier has strong electrical stability in the system, and the flow pattern regulator can meet the requirements of the rheological properties of deep-water oil-based drilling fluid at low temperature and improve the drilling fluid shearing force. Finally, the optimal formulation of deep-water oil-based drilling fluid is completed. The deep water oil base drilling fluid has the characteristics of low viscosity and high shear, constant rheology under wide temperature and pressure range, calcium resistant soil and strong ability of water pollution, etc., which can satisfy the operation of deep water high temperature and high pressure wells. To provide theoretical support and technical guarantee for exploration and development of deep wells. Final formulation: 1% main emulsifier SP-80 calcium stearate) 0.8% auxiliary emulsifier OP-10) 2% self-made organic soil 1% flow regime regulator 1.2% wetting agent WET-L). 3% filtration reducer HFR-L) 2.5% calcium oxide 25% saturated calcium chloride solution barite, The ratio of oil to water is 8: 2.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE254

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