小井眼钻井液技术研究与应用

发布时间：2018-05-05 10:36

  本文选题：小井眼 + 成膜钻井液　； 参考：《东北石油大学》2015年硕士论文

【摘要】：小井眼钻进与常规井眼相比可以大大节约钻井费用,因此已经越来越多地应用于深井复杂井以及老井开窗侧钻等钻井作业当中。但鉴于小井眼的环空间隙小、压耗大、易塌、易漏的难题,对钻进过程中的小井眼钻井液技术也提出了新的挑战,如小井眼钻井要求钻井液具有良好的剪切稀释性、流动性、润滑性和良好的抑制造壁、防塌、悬浮携带能力。本文调研了国内外现有的小井眼钻井液技术,系统分析了小井眼钻井液存在的技术难点,从而确定出本文需要解决的钻井液难题:携岩悬岩问题、高密度下的问题,润滑防卡问题和储层保护问题。在常用的体系中选择出抑制性和储层保护效果好的成膜聚合物钻井液体系作为研究的基础浆,使其性能进一步优化和提高,从而满足小井眼钻进的需求。通过实验添加高温提黏剂提高体系的携岩悬岩能力、优选封堵剂提高体系的封堵能力,优选配伍性好的润滑剂和表面活性剂复配使用,降低油水界面张力,提升体系润滑效果,同时结合理想充填暂堵技术进一步提高体系的储层保护效果,最终确定出抗高温成膜乳化钻井液体系的配方为:5.00%~6.00%膨润土+4.50%~5.00%纯碱Na OH+0.10%~0.15%KPA+0.2%~0.4%高温提黏剂GZN+2.00%~3.00%磺化酚醛树脂+2%~3%高效封堵降滤失剂DYFT-1+2.00%~3.00%抗高温抗盐防塌降滤失剂KFT+2.00%~3.00%高温封堵剂GFD-1+2%~3%隔离膜CMJ-2+2%~3%理想填充剂+1%~2%白油+1%乳化剂(LHR-1)+1%~3%防卡降阻剂+3.00%极压润滑剂ORH-030+3.00%液体润滑剂YDRH-1。室内评价表明抗高温水基成膜乳化钻井液高温条件下性能更稳定,防塌、携岩、润滑能力更强。滤失量低,岩心动态渗透率恢复达90%以上,有效降低界面张力,且反排压差较低,减少水锁损害,达到很好的储层保护效果。抗污染能力强,用Fe SO4处理HCO3-污染有效。最后该体系在黄沙坨小井眼长水平段进行了先导实验。现场应用没有因钻井液而发生起下钻遇阻、遇卡等故障复杂,中完、完井电测一次成功率100%,油层段平均井径扩大率≤10%,下套管、固井顺利,现场测试的表皮系数较低,试气产量较高,取得良好的经济效益和社会效益。
[Abstract]:Compared with conventional borehole drilling, slim hole drilling can save drilling cost greatly, so it has been used more and more in drilling operations such as complex wells in deep wells and sidetracking in old wells. However, in view of the problems of small annulus clearance, large pressure consumption, easy collapse and easy leakage, new challenges have been put forward to the drilling fluid technology in the process of drilling, such as the good shear dilution and fluidity of the drilling fluid required by slim hole drilling. Lubricity and good inhibition of wall building, anti-collapse, suspension carrying capacity. In this paper, the existing small hole drilling fluid technology at home and abroad has been investigated, and the technical difficulties existing in the small hole drilling fluid have been systematically analyzed, so as to determine the problem of drilling fluid which needs to be solved in this paper: the rock carrying problem, the high density problem. Lubrication prevention and reservoir protection. The film-forming polymer drilling fluid system, which has good inhibition and reservoir protection effect, is selected as the basic slurry for further optimization and improvement of its performance in order to meet the needs of small hole drilling. By adding high temperature viscosifier to improve the rock carrying capacity of the system, the plugging agent can improve the plugging ability of the system, the lubricant and surfactant with good compatibility can be used to reduce the interfacial tension between oil and water, and the lubricating effect of the system can be improved. At the same time, combined with ideal filling temporary plugging technology, the reservoir protection effect of the system can be further improved. Finally, the formula of high temperature film forming emulsification drilling fluid system was determined as follows:% 5.00% bentonite 4.50% NaOH 0.10%~0.15%KPA 0.2wt% sodium hydroxide 0.2wt% high temperature tackifying agent GZN 2.003.00% sulfonated phenolic resin 2o 3% high efficiency plugging and reducing fluid loss agent DYFT-1 2.003.00% high temperature salt resistance, resistance to sloughing and draining control agent KFT 2. 00% high temperature plugging agent GFD-1 2 and 3% isolation membrane CMJ-2 2 and 3% ideal filler 1 and 2% white oil 1% emulsifier LHR-1) 3% anti-blocking agent 3% extreme pressure lubricant ORH-030 3. 00% liquid lubricant YDRH-1. The laboratory evaluation shows that the high temperature water-based emulsion drilling fluid is more stable, anti-collapse, rock-carrying and more lubricating under high temperature conditions. The dynamic permeability of core is over 90% which can effectively reduce the interfacial tension and reverse pressure difference reduce the damage of water lock and achieve a good reservoir protection effect. It is effective to treat HCO 3-pollution with Fe SO4. Finally, the pilot experiment was carried out in the long horizontal section of Huangshatuo well. The field application did not occur because of drilling fluid and the drilldown was blocked, the faults such as jam were complicated, the completion rate of electric logging was 100, the average diameter expansion rate of reservoir was 鈮，

本文编号：1847362