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YC21—1—3井是位于海南省莺琼盆地的崖城21—1构造上的一口高温气压、高难度深井,井深4688m。此井用的PYRODRILL钻井液体系由改性褐煤(基本材料)、高温有机包被剂及高温稳定剂等组成,具有良好的热稳定性及一定的抗盐、抗水泥侵的能力,但抑制性差。在实际钻井中加强钻井液的处理、维护,及时测定钻井液高温性能;严格控制其低密度固相含量和膨润土含量,避免各种形式的污染是保证钻井液性能稳定的重要措施。本井完井测试的钻井液是在地面一次性配制的。当它一次性替入井后,经历高温变化时间快,反应剧烈,高温对其性能的影响在常温状态下是不能预测的。高温和高温作用的时间是评价高温钻井液的重要因素。
YC21-1-3 well is a high-temperature and pressure deep-well with a depth of 4688m, located at Yacheng 21-1 in Ying-Qiong Basin, Hainan Province. This well PYRODRILL drilling fluid system consists of modified lignite (basic material), high temperature organic coating agent and high temperature stabilizer, etc., has good thermal stability and certain resistance to salt and cement invasion, but the inhibition is poor . Drilling fluid in the actual drilling to enhance the handling, maintenance, and timely determination of drilling fluid high temperature performance; strict control of its low-density solid content and bentonite content, to avoid all forms of pollution is an important measure to ensure the stability of drilling fluid performance. The well completion test drilling fluid is formulated on the ground once. When it goes into well at one time, it experiences rapid change of high temperature and severe reaction. The influence of high temperature on its performance can not be predicted under normal temperature. The time of high temperature and high temperature is an important factor to evaluate high temperature drilling fluid.