威远页岩气水基钻井液研究与应用

发布时间：2018-01-27 06:27

  本文关键词： 威远页岩气 水基钻井液 抑制机理 聚胺抑制剂 强抑制性　出处：《东北石油大学》2016年硕士论文　论文类型：学位论文

【摘要】：为了解决我国油气资源紧张的现状,加大勘探开发页岩气力度已是发展趋势,短短几年,已建成几个颇具规模的试点,发展迅速。鉴于美国页岩气开发的成功经验,国内页岩气水平井施工中主要使用油基钻井液,但油基钻井液高成本、高污染是其固有的缺陷,对安全健康环保等方面有不利影响。因此,有必要研究出在页岩气勘探开发中以成本较低、更加安全健康环保的水基钻井液,从而取代油基钻井液。页岩地层裂缝发育、水敏性强,在长水平段钻井中,不仅容易发生井漏、垮塌、缩径等问题,而且因水平段较长,还会带来摩阻、携岩及地层污染等问题,井下复杂发生几率大大增加。因此,在页岩气水平井钻井中解决井壁稳定、降阻减摩和岩屑床清除等问题就成为页岩气水平井水基钻井液施工的难点和重点。本文阐述了XJA-1的抑制机理,并以此为核心处理剂,优选评价了其它处理剂,建立了页岩气水基钻井液体系配方,并对该体系进行了室内评价,表明该钻井液体系在密度为2.0g/cm3时抗温可达160℃;可抗10%的粘土污染、5%的盐水污染;砂床实验中30min无滤失,且侵入深度仅为2.5cm,封堵性能良好;老化前后磨阻系数均小于0.08,润滑性能较好;渗透率恢复值87%,可有效保护储层。现场试验表明该钻井液体系机械钻速可达3~6m/h,平均井径扩大率为12.73%,虽与油基钻井液有些差距,但表现出较好的润滑性和抑制性,能满足现场施工要求。与油基钻井液相比,钻井液成本可降低近30%,且钻屑含油量较低,降低了对环境的危害,应用前景广阔。
[Abstract]:In order to solve the shortage of oil and gas resources in China, it is a development trend to increase the exploration and development of shale gas. In just a few years, several pilot projects have been built on a considerable scale. In view of the successful experience of shale gas development in the United States, oil based drilling fluid is mainly used in horizontal well construction of shale gas in China, but its inherent defects are high cost and high pollution of oil based drilling fluid. Therefore, it is necessary to study the water-based drilling fluid with lower cost and safer, healthier and environmental protection in shale gas exploration and development. Thus replacing oil based drilling fluid. Shale formation fracture development, strong water sensitivity, in the long horizontal section drilling, not only easy to occur well leakage, collapse, shrinkage and other problems, but also because of a long horizontal section, but also bring friction. The probability of underground complex occurrence is greatly increased due to the problems of rock carrying and formation pollution. Therefore, the stability of borehole lining is solved in the drilling of shale gas horizontal wells. The problems of reducing resistance and reducing friction and removing cuttings bed have become the difficulties and emphases of drilling fluid construction in shale gas horizontal wells. This paper expounds the mechanism of XJA-1 suppression and takes it as the core treatment agent. The formula of shale gas / water base drilling fluid system was established and the laboratory evaluation was carried out. The results show that the drilling fluid system has a temperature resistance of 160 鈩，

本文编号：1467822