Key Technologies for Slim Hole Drilling in the Southern Sulige Block
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摘要: 针对苏里格南区块小井眼钻井存在的钻头选型困难、井眼轨迹控制难度大、电测遇阻频繁、井漏严重和钻井速度慢等技术难点，开展了PDC钻头优化、螺杆钻具改进、钻具组合优选、井眼轨迹控制、钻井液体系优选和井下故障防控等关键技术研究，形成了苏里格南区块小井眼钻井关键技术，并在80余口井进行了现场应用。应用结果表明：改进后的PDC钻头性能稳定，机械钻速高，6口井钻井周期在10 d以内；优选的钻具组合和螺杆钻具能实现了二开“两趟钻”的提速要求；采取调控钻井液密度、降低压耗和预加随钻堵漏材料等措施钻穿易漏层，防漏堵漏效果显著；优化钻井液性能，提高了电测一次成功率。苏里格南区块小井眼钻井关键技术为该区块小井眼安全高效钻井提供了技术支撑。Abstract: Technical difficulties have been encountered in slim hole drilling in the Southern Sulige Block. The difficulties include bit selection, well trajectory control, frequent sticking during electrical logging, severe lost circulation and low penetration rate, etc. Therefore, researches on key technologies such as PDC bit optimization, PDM tool improvement, BHA optimization, well trajectory control, optimal selection of drilling fluids systems, anti-leakage and plugging were carried out, and formed key technologies for slim hole drilling in the Southern Sulige Block, which were applied in more than 80 wells. Field applications suggest that the improved PDC bit has stable performance, with high penetration rate. Among them, the drilling cycle of 6 wells is less than 10 days; the optimized BHA and PDM tools can meet the requirement of “two-run drilling” in the second-spud section. By implementing the strategy of controlling the drilling fluid density, reducing the pressure loss and pre-adding plugging material while drilling the thief zone, etc., remarkable anti-leakage and plugging effects were achieved; Drilling fluid properties have been optimized to improve the success rate of one-time electrical logging. The key drilling technologies for slim holes in the Southern Sulige Block have provided technical support for safe and efficient slim hole drilling on this area.ea.
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表 1 不同型号的螺杆钻具施工参数
Table 1 Construction parameters of different types of PDM tools
使用井段 型号 头数 级数 螺杆总长/m 使用井段/m 排量/(L·s–1) 转速/(r·min–1) 扭矩/(N·m) 压降/MPa 功率/kW 上部 5LZ127X7Y-IV 5︰6 5.0 7.42 720～2 300 16 197 3 012 4.0 52 中部 7LZ127X7Y-V 7︰8 3.8 7.66 2 300～3 000 16 120 4 018 3.0 46 下部 7LZ127X7Y-AD 7︰8 3.8 7.66 3 000～4 000 14 60 7 600 3.4 40 
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表 2 地层自然降斜规律统计结果
Table 2 Statistical results of the natural dip law of stratum
地层 造斜规律 降斜率/（（°）·（30m）–1） 直罗组 降斜 0.49～0.74 延安组 降斜 0.49～1.96 延长组 降斜 0.40～3.00 纸坊组 降斜 0.28～0.80 和尚沟组 降斜 0.20～0.80 刘家沟组 降斜 0.23～1.59 石千峰组 降斜 0.20～1.19 石盒子组 降斜 0.22～1.50 山西组 降斜 0.10～0.50 太原组 降斜 0.10～0.50 本溪组 降斜 0.10～0.50 马家沟组 降斜 0.10～0.30
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表 3 降排量后环空当量密度计算结果
Table 3 Calculation results of annular equivalent density after reducing the flowrate
易漏层 垂深/
m井深/
m钻井液密度/
（kg·L–1）排量/
（L·s–1）上返速度/
（m·s–1）环空压耗/
MPa对应当量密度/
（kg·L–1）当量密度差/
（kg·L–1）延长组中部 1 700 1 800 1.06 14 1.17 1.62 0.10 0.03 12 1.00 1.19 0.07 刘家沟组底部 2 980 3 220 1.08 14 1.17 2.96 0.10 0.03 12 1.00 2.17 0.07
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