Laboratory Study on Leak-Proof Early Strength Tough Cement Surry
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摘要: 大庆、长庆、克拉玛依等老区油田油气资源埋藏浅、井底温度低,加之长期注水开发等增产措施的广泛应用,储层地质结构复杂、压力系统紊乱,大斜度井、水平井钻遇溢漏同存的几率增加,固井过程中漏喷风险增大,对水泥浆体系提出了更高的要求。从材料学角度出发,利用经过表面预处理的新型油井水泥增强剂DRB-3S的低温增强、自悬浮稳定、混配性好的特点,将其与膨胀材料和抗窜增韧材料进行复配,制得了防漏早强韧性水泥浆体系。实验结果表明,该体系施工性能好,稠化过渡时间短,API失水量小,游离液为0,55℃时4 h抗压强度为7.2~11.5 MPa,还可有效封堵毫米级的渗透和裂缝性漏失,为复杂区块大斜度井、水平井固井质量的改善提供了有力的技术支持。Abstract: In some old oilfields such as Daqing, Changqing and Kelamayi, shallow burial of oil and gas, low bottom hole temperature, long-term wide use of stimulation measures such as water injection, complex geological structure of the reservoirs, as well as mutual interference of different pressure systems, are all factors contributing to the coexistence of leaking and overflow (or blowout) during high angle and horizontal well drilling as well as well cementing. Well cementing in these oilfields imposes higher demands on cement slurries. A new surface-pretreated oil well cement strengthening agent DRB-3S, having the characteristics of low-temperature strength, stable self-suspending ability and good mixing performance, was compounded with expansion material and anti-channeling toughness enhancing material to form a leak-proof tough early strength cement slurry. This cement slurry has good operational performance; the transition time of the thickening process is short, the API filtration rate is low and has zero free water. The 4 h compressive strength at 55℃ is between 7.2 MPa and 11.5 MPa. It is able to stop cement slurry loss into permeable and fractured formations with millimeter-sized flow channels. The cement slurry has provided a powerful technical support to the improvement of the quality of well cementing.
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