绒囊复合堵漏钻井液体系研究

发布时间：2018-06-24 09:25

本文选题：绒囊微泡 + 吸水性膨体　；参考：《东北石油大学》2015年硕士论文

【摘要】：对于易漏失地层,一般使用泡沫钻井液进行处理,但是泡沫钻井液有很多局限性:现场应用过程中极易受到水质条件的影响、泡沫钻井液无法自我循环、在返出井筒后要使用专门的脱气装置进行脱气处理等,成本很高。另外,使用后的泡沫钻井液如果处理不当,还可能造成地面环境的污染。针对上述问题,研制开发了一种新型的堵漏钻井液——绒囊复合堵漏钻井液。优选了两种表面活性剂(十二烷基苯磺酸钠SDBS与十二烷基二甲基甜菜碱BS-12)按质量比6:4的比例混合作为气囊剂;两种高分子助剂(聚丙烯酰胺PAM与高粘度羧甲基纤维素HV-CMS)按1:1比例混合作为绒层剂,在钻井液中产生一种含特殊“绒囊”结构的高强度微泡体系;其次再向其中加入吸水性膨体颗粒,形成新型绒囊复合堵漏钻井液体系。通过大量实验确定了复合堵漏钻井液体系的配方:4%膨润土+0.4%DSJ+0.4%SPNH+0.3%KPAM+0.24%碳酸钠+0.2%气囊剂+0.35%绒层剂+3%吸水性膨体膨体。不同条件下绒囊复合堵漏钻井液性能测定实验结果表明,该复合堵漏钻井液体系在高温下的稳定性,抗盐、钙等污染能力强。岩芯封堵实验表明,绒囊复合堵漏钻井液体系对大孔道漏失地层和小孔道漏失层的封堵率均达到92%以上,封堵效果远高于一般的钻井液。
[Abstract]:Foam drilling fluid is generally used to deal with the easily leaky formation, but foam drilling fluid has many limitations: it is easily affected by water quality conditions in the field application process, foam drilling fluid can not be self-circulating. It is very expensive to use a special degassing device after returning to the wellbore. In addition, if the foam drilling fluid is not properly treated, it may cause environmental pollution on the ground. In view of the above problems, a new type of plugging drilling fluid-cashmere bag compound plugging drilling fluid has been developed. Two surfactants (sodium dodecylbenzene sulfonate SDBs and dodecyl dimethyl betaine BS-12) were selected as airbag agents at 6:4 mass ratio. Two kinds of polymer auxiliaries (polyacrylamide PAM and high viscosity carboxymethyl cellulose HV-CMS) were mixed as the cashmere agent at 1:1 ratio to form a high strength microbubble system with special "cashmere" structure in the drilling fluid. Secondly, water-absorbent expanded particles were added to it to form a new type of cashmere and capsule compound plugging drilling fluid system. Through a large number of experiments, the formula of compound plugging drilling fluid system was determined: 0.4% bentonite 0.4DSJ and 0.4SPNH 0.3KPAM 0.24% sodium carbonate 0.2wt% air bag agent 0.35% cashmere agent 3% water absorbent bentonite. The experimental results show that the system is stable, resistant to salt and calcium pollution at high temperature. The core plugging experiment shows that the plugging rate of both large channel leakage formation and small channel leakage layer is more than 92%, and the plugging effect is much higher than that of common drilling fluid.
【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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