水基微泡沫钻井液防漏堵漏原理研究
  蒲晓林,李霜,李艳梅,罗兴树,徐绍成,罗健生
  　　依据低密度和气泡变形堵塞理论,分析了微泡沫钻井液的防漏堵漏原理。采用砂石充填的模拟漏层实验方法,研究了无粘土相微泡沫钻井液防漏堵漏作用效果,结果表明,微泡沫钻井液对80~120 目砂石构成的孔隙通道具有最好的堵漏效果,对40~80目砂石构成的孔隙通道具有良好堵漏效果,对10~40 目砂石构成的孔隙通道具有一定的堵漏效果,而且,随着压力增加,微泡沫钻井液仍具有堵漏承压能力。
【作者单位】：西南石油学院 (蒲晓林;李霜;李艳梅;罗兴树);中海油田服务股份公司 (徐绍成);中海油田服务股份公司(罗健生)
【关键词】：微泡沫;水基;钻井液;防漏;堵漏;理论;实验室试验
【基金】：中海油田“低密度微乳化泡沫钻井液研究与应用”项目(编号 JSKF2003YJ18)研究成果。~~
【分类号】：TE28
【正文快照】：
　　　　微泡沫钻井液与普通泡沫钻井液的区别在于泡沫质量较小,直接通过物理搅拌使空气混入液相中被表面活性剂包裹即可形成一定稳定度的两相或三相微泡沫体系。正因为如此,微泡沫钻井液的密度上限比普通泡沫钻井液通过压缩充气得到的密度上限要高0.4~0.5 g/cm3,然而,由于减少了配制上的空气压缩设备,微泡沫钻井液可以反复循环使用,其使用成本大幅度降低。微泡沫钻井液的主要用途是在低压易漏地层作为防漏堵漏工作流体,许多油气田的现场应用已经证明了这一点。本文从理论方面分析了微泡沫钻井液的防漏堵漏原理,并从实验上研究了其防漏堵漏效果…
 
  EXPERIMENTAL RESEARCH OF THE LEAK RESISTANCE AND LOSS CIRCULATION CONTR OL OF WATER-BASE MICROFOAM DRILLING FLUID
  Pu Xiaolin1;Li Shuang1;Li Yanmei1;Luo Xingshu1;Xu S haocheng2 and Luo Jiansheng2 (1. Southwest Petroleum Institute; and 2. Oil Field Service Company;CNOOC)
  　The principles of the leak resistance and los s circulation control of water-base microfoam drilling fluid are analyzed in th e paper according to the low-density and bubble deformation plugging theory. Th rough researching the effects of clay free microfoam drilling fluid on the leak resistance and loss circulation control by use of the analog leakage formation b eing filled up with different sizes of sand grains in the experiment, it was in dicated that the plugging effect of the mirofoam drilling fluid on the pore pass ages made up by the sand grains of 80-120 meshes is best, then the 40-80 meshes , and then the under 40 meshes. Moreover, along with the increase in pressure , the microfoam drilling fluid can still possess the plugging and loading capac ity.
【Keyword】：Drilling, Microfoam, Drilling fluid, Loss Circulation control principle, Experimental research