Well Bore Stability Technology Using Blocking Drilling Fluid System Suitable for the Deep High Temperature Cracked Strata in Well Songke-2
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摘要: 为了解决松科2井深部高温高压严重龟裂型硬质散岩成井困难的问题，结合力学分析计算、实物模拟实验，明确了封堵环厚度影响因素；经过合理遴选组配，验证了细粒高强度骨架与耐高温软质悬浮体作为随钻泥浆封堵剂的封堵效果；对现场作业压力进行了计算和针对性控制.建立了三颗粒桥组骨架自锁楔卡的力学模型，推导出了单个桥组的抗破坏能力公式.相比于基浆，乳化沥青、氧化沥青、磺化沥青能够使得高温高压失水量降低率达到56%、44%和48%.颗粒尺寸及强度、裂缝宽度、压差等因素均对封堵环的厚度具有重要影响，而刚性封堵剂重晶石、超细碳酸钙和可变形封堵粒子乳化沥青的复配使用，可起到快速封堵效果.基于上述分析和试验，配合现场技术对钻进作业中的井内压力进行了有效控制，实现了适度正向压差下的挤扶防塌功效.籍此，获得了五开井段（5 910~7 018 m）裸眼钻进井壁稳定的重要保障条件.Abstract: To solve the problem of drilling in severely cracked hard rock in deep high temperature and high pressure (HTHP) stratum of Well Songke-2, mechanical analysis and physical simulation experiment were used to clarify the factors affecting the thickness of the plugging layer in this study. The sealing effect of high-strength skeleton particles and HT deformable soften particles was verified through HTHP filtration test, and the on-site operation pressure was calculated and controlled. The self-locking mechanical model of the three-particle bridge group skeleton was established, and the anti-destructive ability formula of the single bridge group was derived. Compared with the blank formula, emulsified asphalt, oxidized asphalt and sulfonated asphalt can reduce the HTHP water loss volume by 56%, 44% and 48%, respectively. Particle size and strength, crack width and pressure difference have important influence on the thickness of the plugging layer. A quick blocking effect can be achieved by combining the rigid plugging agent with deformable plugging particles. Based on the above analysis and tests, the drilling pressure in the operation was effectively controlled in conjunction with the on-site technology, and the compaction and anti-collapse effect under moderate positive pressure difference was realized. With the techniques mentioned above, the fifth spud of Well Songke-2 was completed successfully with the open-hole section from 5 910 to 7 018 m.
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Key words:
- cracked strata /
- plugging agent /
- bridge plug /
- positive pressure difference /
- drag reduction /
- engineering geology
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图 1 松科2井深部碎块岩石（心径92 mm）
Fig. 1. Deep cracked rock in Well Songke-2 (core diameter 92 mm)
图 4 沥青类封堵剂对高温高压失水量的影响
Fig. 4. Effect of asphalt plugging agent on high temperature and high pressure water loss
图 5 复配封堵剂对高温高压失水量的影响
Fig. 5. Effect of compound plugging agent on high temperature and high pressure water loss
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