大庆油田源211区块新型油包水乳化钻井液研究

发布时间：2018-03-04 03:08

  本文选题：新型油包水乳化钻井液　切入点：性能评价　出处：《东北石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：目前,油基钻井液在钻井行业中发展迅猛,因为其具有抗高温、抗盐侵、钙侵、润滑性好,井壁稳定等优。但由于其昂贵的费用和对储层污染的严重,限制其在钻井工作中的使用。应用水基钻井液体系时,易发生缩径、井壁剥落、坍塌、岩屑床堆积等复杂问题,影响勘探开发效率。在钻遇高难度复杂井段和各种特殊工艺井时,只有使用油基钻井液才能满足现场的实际应用。在我国经济可持续发展,重视生态保护的大的形势下,钻井行业也越来越重视对储层的保护,对油基钻井液在环境保护方面的要求越越来越严格,国内现有的油基钻井液已经不能满足目前的钻井需求,这就需要研究出一套既能够满足钻井需求又能够保护储层的新型油基钻井液体系。本论文通过实验研究出一套新型油包水乳化钻井液体系。首先通过对几种油品的性质和来源等方面的综合对比,确定来源较容易并有一定生物降解性的生物柴油作为新型油包水乳化钻井液体系的基础油。然后通过成胶实验、高温老化试验和高温高压滤失试验等方法,优选出乳化性能好且污染小的乳化剂,成胶性好且有一定提黏提切能力的高性能有机土和高温高压滤失量低于5ml的复合型降滤失剂。再对该钻井液体系进行钻井性能评判,并优选出各项处理剂在体系中的最优加量。最终确定新型油包水乳化钻井液体系的配方为:基液(生物柴油)+主乳化剂3%+辅乳化剂1%+有机土2%+降滤失剂3.5%+20%CaCl2溶液(体积20%)+3%1250目CaCO3。通过钻井液流变性实验,电稳定性实验,抗温性能实验,润滑性能实验,抗污染性能实验,抑制性能评价实验以及储层保护性能评价实验等方法,确定新型油包水乳化钻井液具有稳定性强,抗120℃高温,润滑性好,抗15%的钙盐和水污染的能力,岩屑回收率在98%以上的抑制页岩水化分散能力以及渗透率恢复值在97%以上的储层保护能力。本研究体系在满足对高温深井、盐膏层等复杂地层钻井需求的同时还满足环保和经济需求,较大庆以往的油基钻井液有了很大的改善,并通过在现场两口井的应用,钻井液的流变性、抗温性、滤失性等都能满足钻井需求。为我国更深一层开展环保油基钻井液技术的发展奠定了理论和现实基础。
[Abstract]:At present, oil-based drilling fluids are developing rapidly in the drilling industry because of their excellent properties such as high temperature resistance, salt invasion resistance, calcium invasion, good lubricity and wellbore stability, etc. However, due to their high cost and serious reservoir pollution, In the application of water-based drilling fluid system, complex problems such as diameter shrinkage, well wall flaking, collapse, debris bed accumulation and so on are easy to occur. It affects the efficiency of exploration and development. Only using oil based drilling fluid can satisfy the practical application in the field when drilling complex section and various special process wells. Under the situation of sustainable economic development and ecological protection in our country, The drilling industry also pays more and more attention to reservoir protection. The more stringent the requirements for environmental protection of oil-based drilling fluids are, the more the existing oil based drilling fluids in China can no longer meet the current drilling demand. Therefore, it is necessary to develop a new oil-base drilling fluid system which can satisfy the drilling demand and protect the reservoir. In this paper, a new oil-in-water emulsified drilling fluid system is studied by experiments. A comprehensive comparison of the nature and source of, The biodiesel, which is easy to come from and has certain biodegradability, is used as the base oil of the new oil-in-water emulsified drilling fluid system, and then through the gelation experiment, the high-temperature aging test and the high-temperature high-pressure filtration test, etc. The emulsifier with good emulsifying property and little pollution, high performance organic soil with good gelation property and certain viscosity raising and cutting ability, and compound filter reducer with high temperature and high pressure filtration less than 5 ml were selected. The drilling performance of the drilling fluid system was evaluated. Finally, the formula of the new oil-in-water emulsified drilling fluid system was determined as follows: base solution (biodiesel) main emulsifier 3% auxiliary emulsifier 1% organic soil 2% filter reducer 3.5% 20Cl 2. Solution (volume 20) 3 ~ (50) mesh CaCO _ 3. The rheological properties of drilling fluid were tested. The methods of electrical stability experiment, temperature resistance experiment, lubricating performance experiment, antipollution performance experiment, inhibition performance evaluation experiment and reservoir protection performance evaluation experiment, etc., determined that the new oil-in-water emulsified drilling fluid has strong stability. Resistance to 120 鈩，

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