Application of Gravity Displacement Drilling Fluid and Low Friction Drilling Fluid in ST2-4 Well
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摘要: ST2-4井是位于塔里木盆地桑塔木断垒带2号构造的一口侧钻井，其Φ152.4 mm井眼4350～4800 m井段井斜为0°～61.1°，中途完钻直推存储式测井过程中发生电测仪器被卡，井底50.95 m电测仪器无水眼通道，不能建立循环，第一次浸泡常规解卡液未解卡，第二次对常规解卡液配方改造升级为改进型解卡液，成功解卡，避免了超千万的电测仪器损失。改进型解卡液的改进措施包括：(1)将配制解卡液的清水替换浓度为10%的CaCl2盐水；(2)将快速渗透剂快T的浓度提高至30%；(3)将解卡液密度提至高于井浆密度0.5 g/cm3，利用重力置换原理将解卡液置换至井底浸泡电测仪器。解卡后采用“低黏度切力轻浆+重稠浆段塞”携砂工艺保持井眼通畅，引入有机减阻剂YJJZ-1将常规KCl聚磺体系转换为低摩阻钻井液降低摩阻，通过提高HTHP泥饼质量、加强井浆防塌抑制性结合，完成了斜井段易黏卡井段电测、下套管作业。Abstract: Well ST2.4 in 152.4 mm hole 4350～4800 m interval well deviation 0°-61.1°, in the process of the middle-completion direct-push memory logging, the electric logging tool got stuck, the non-water hole channel of the 50.95 m electric logging tool could not set up a cycle, and the conventional unstuck fluid did not get unstuck after the first immersion, for the second time, the formula of the conventional unblocking agent was upgraded to an improved unblocking agent. Firstly, the clean water of the unblocking agent was replaced with 10% CaCl2 salt water, and secondly, the concentration of the rapid penetrant fast T was increased to 30% , the third is to raise the density of the unblocking fluid to 0.5 g/cm3 above the mud density, and to replace the unblocking fluid to the bottom of the well by using the gravity replacement principle, thus successfully unblocking the electric measuring instrument, avoiding the loss of over ten million electric measuring instruments. The“Low viscosity, light slurry + heavy slurry slug” sand-carrying technology was used to keep the wellbore unblocked after the break-up, and the organic drag reducer YJJZ-1 was introduced to convert the conventional KCl polysulfonate system into the low friction drilling fluid to reduce the friction, through improving the quality of HTHP mud cake and strengthening the combination of anti-sloughing and inhibition of mud, the electric logging and casing running operations in the inclined section are completed.
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表 1 常规解卡液与改进型解卡液滤液速度
滤液 不同时间下（min）解卡液的滤液体积/mL 1 2 5 10 15 30 60 常规解卡液 4 6 11 16 20 30 46 改进型解卡液 9 12 20 30 39 55 85 注：2种解卡液不同时间的滤液体积为累计量。 
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表 2 ST2-4井浆中加入YJJZ-1后的 流变性能与泥饼黏滞系数
YJJZ-1/
%ρ/
g·cm−3PV/
mPa·sYP/
Paφ6 φ3 Gel/
PaFLAPI/
mLpH Kf 0 1.30 30 7.5 3 2 1.5/6.0 2.0 9 0.15 0.5 1.30 30 7.5 3 2 1.5/6.0 2.0 9 0.07 1.0 1.30 30 7.5 3 2 1.5/6.0 2.0 9 0.05 1.5 1.30 30 7.5 3 2 1.5/6.0 2.0 9 0.04
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表 3 ST2-4井井深4800 m的低摩阻钻井液流变性能
钻井液体系 ρ/
g·cm−3FV/
sPV/
mPa·sYP/
PaGel/
Pa/PaFLAPI/
mLFLHTHP/
mLpH Cl-/
mg·L−1Ca2+/
mg·L−1MBT/
g·L−1Kf KCl-聚磺 1.30 73 48 12 1.5/6.0 3.2 9 8 22 470 100 28 0.15 低摩阻 1.30 68 42 14 2.5/9.0 2.0 8 9 32 130 382 35 0.04 低摩阻 1.30 66 38 15 2.5/10.0 1.4 7 9 33 590 450 35 0.03
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