下川东复杂井钻井液体系深化研究

发布时间：2018-12-20 17:05

【摘要】：下川东地区水平井、大斜度井等特殊工艺井的逐渐增多,提速提效的要求日渐增大,目前的钻井液体系难以适应钻井工程对泥岩、页岩、煤层的防塌,大斜度及高压差井段的防卡,深井段防卡以及钻井液性能稳定等方面的技术要求,因此,有必要对下川东钻井液体系进一步深化研究以适应新形势的要求。本文通过对井壁失稳机理和易塌地层的分布状况及特点进行研究,根据不同岩性提出相应的技术对策,重点开发有机盐、聚合醇防塌钻井液体系,对主要处理剂的性质进行重点剖析,并对辅助处理剂进行了优选,以滚动回收率、线性膨胀值、抗污染实验等评价手段优选出适合下川东地区侏罗系以及页岩、煤层防塌钻井液体系。从三叠系钻井技术难点出发,利用同离子效应以及活度平衡理论,优化了该段聚磺钻井液体系。从润滑剂的抗温、抗盐、起泡性能等指标为突破口,利用聚合醇的润滑作用、提高钻井液封堵性能、改善滤饼质量、优化防卡解卡工艺等降低渗透地层的压力传递的思路,形成二叠系特殊防卡技术。通过不加入坂土,在清水中直接加入KC1、甲酸盐等抑制剂的基础上,加入降失水剂、封堵剂等功能性处理,达到满足抗温、携砂等要求,形成了适合石炭系水平段钻井要求的无土相钻井液体系。开发出的五套钻井液体系在下川东构造进行了试用,达到了提高钻井速度,减少复杂事故,提高综合经济效益等目的。进而形成各区块的模块化技术方案进行推广应用。
[Abstract]:With the increasing number of horizontal wells, large deviated wells and other special processing wells in the eastern part of Sichuan, the requirements of increasing speed and efficiency are increasing. The current drilling fluid system is difficult to adapt to the sloughing of mudstone, shale, and coal seams in drilling engineering. In order to meet the requirements of the new situation, it is necessary to further study the drilling fluid system of East Sichuan in order to meet the technical requirements in the aspects of blocking prevention of large deviation and high pressure difference well section, deep well block prevention and stability of drilling fluid performance, so it is necessary to further deepen the study of drilling fluid system in Lower Sichuan East China in order to meet the requirements of new situation. In this paper, the mechanism of wellbore instability and the distribution and characteristics of sloughing formation are studied. According to the different lithology, the corresponding technical countermeasures are put forward, and the organic salts and polyalcohol sloughing prevention drilling fluid system are developed emphatically. The properties of the main treatment agents are analyzed emphatically, and the auxiliary treatment agents are selected to be suitable for the Jurassic and shale systems in the eastern part of Sichuan province by means of rolling recovery rate, linear expansion value, anti-pollution experiment and so on. Coal seam anti-sloughing drilling fluid system. Based on the technical difficulties of Triassic drilling, the polysulfonated drilling fluid system was optimized by using the theory of iso-ion effect and activity equilibrium. From the point of view of temperature resistance, salt resistance and foaming performance of lubricant as a breakthrough point, using the lubricating effect of polyalcohol to improve the plugging performance of drilling fluid, improve the quality of filter cake, optimize the process of card prevention, etc., the train of thought for reducing pressure transfer in permeable formation can be obtained. The formation of Permian special anti-blocking technology. By adding water reducing agent, plugging agent and other functional treatment, directly adding KC1, formate and other inhibitors in clear water without adding sakesite, to meet the requirements of temperature resistance, sand carrying, etc. A soilless drilling fluid system suitable for the horizontal section of Carboniferous drilling was formed. The five sets of drilling fluid system developed have been tried out in the structure of East Sichuan, which can improve the drilling speed, reduce the complex accidents and increase the comprehensive economic benefits. Then the modularization technology scheme of each block is popularized and applied.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE254

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