深水高温高压井钻井液技术
发布时间：2019-01-05 02:39
【摘要】：LS25-1S-1深水高温高压井实钻井深为4 448 m,完钻层位为梅山组,采用六开井身结构,φ212.7 mm井段为目的层段,压力系数预测为1.70~1.84,安全密度窗口窄,需重点关注井控、防漏和水合物生成的预防;同时由于井底温度约为147℃,而出口温度只有17℃,保持钻井液在高密度下的高、低温稳定性、防重晶石沉降、良好流变性和储层保护是该井段技术重点。以LS区块气源为研究对象,通过利用水合物抑制软件Hydra FLASH绘制不同抑制剂浓度下水合物P-T相图,优选出钻进及静止期间水合物抑制配方:(9%~15%)Na Cl+5%KCl+10%KCOOH+(0~45%)乙二醇。选用了抗高温降滤失剂HTFL,其加量为0.8%时体系高温高压滤失量小于10 m L,泥饼质量好。研发了一种新型的封堵剂PFFPA,PF-FPA较FLC2000具有更好的封堵降滤失效果。性能评价结果表明,该体系抗温达170℃,高低温流变性平稳,能抗10%的钙土污染,而且沉降稳定性好,封堵能力强,渗透率恢复值在80%以上,储层保护效果好。在现场应用中,通过Drill Bench软件模拟,将排量降至1 400 L/min,此时ECD为1.94 g/cm3,小于漏失压力当量密度(1.96 g/cm3),ROP为10 m/h,岩屑传输效率仍在85%以上,满足携岩要求。该井顺利完钻,表明该套钻井液技术解决了现场作业难题。
[Abstract]:The drilling depth of LS25-1S-1 deep water high temperature and high pressure well is 4 448 m, the complete drilling horizon is Meishan formation, the well body structure is adopted, the 蠁 212.7 mm well section is the target interval, the pressure coefficient is predicted to be 1. 70 ~ 1. 84, and the safe density window is narrow. The prevention of well control, leakage prevention and hydrate formation should be paid more attention to. At the same time, because the bottom hole temperature is about 147 鈩，
本文编号：2401152
[Abstract]:The drilling depth of LS25-1S-1 deep water high temperature and high pressure well is 4 448 m, the complete drilling horizon is Meishan formation, the well body structure is adopted, the 蠁 212.7 mm well section is the target interval, the pressure coefficient is predicted to be 1. 70 ~ 1. 84, and the safe density window is narrow. The prevention of well control, leakage prevention and hydrate formation should be paid more attention to. At the same time, because the bottom hole temperature is about 147 鈩，
本文编号：2401152
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