低温强度诱导晶核的研制及评价
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中国石油集团海洋工程公司渤星公司

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TE256 DOI

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Preparation and Evaluation of Low Temperature Strength Induced Nucleation
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    摘要:

    针对低温或表层固井水泥浆侯凝时间长、水泥石早期强度低且发展慢等问题,采用“溶液化学沉淀法+磁力搅拌+超声分散”制备工艺提高混合效率,利用梳型聚羧酸减阻剂作为改性剂,研制出一种水泥石低温强度诱导晶核材料LTI。通过透射电镜观测其微观形貌基本单元结构为堆叠的类锡箔状和絮片状,伴有少量棒状和“规则”方形晶体,尺寸在100-200nm,周围延伸出类纤维状物质,比表面积较大。掺有晶核LTI的水泥浆稠化、抗压强度、静胶凝试验结果表明:晶核LTI借助自身模板成核作用促进水泥水化进程,降低堆积产物成核势垒,促使低温稠化曲线由“爬坡”向“直角”转变,可在10℃条件下将稠化时间之比控制在0.47以内;晶核LTI可诱导水泥石早期强度快速发展,在20℃条件下,掺有1.5%晶核LTI的水泥石,24h抗压强度提高89.1%,掺有5%晶核LTI的水泥石24h抗压强度大于20MPa,提高了257.8%,30℃条件下,晶核LTI掺量1.5%时,水泥石6h抗压强度高于4MPa,提高掺量至5%后,水泥石6h抗压强度高达6.5MPa,相比于刚刚成型的净浆水泥石,抗压强度实现跨越式发展;掺有晶核LTI的水泥浆在30℃条件下静胶凝过渡时间可缩短至18min,降低至净浆的23%,助于提高水泥浆的防窜功能。性能优异的纳米级水化硅酸钙晶核LTI,可缩短低温浅层或高寒区域油气井建井周期、提高固井质量。

    Abstract:

    In response to issues such as long waiting time for low-temperature or surface cementing cement slurry, low early strength and slow development of cement stone, by optimizing the preparation process using "solution chemical precipitation method+magnetic stirring+ultrasonic dispersion" and using comb type polycarboxylic acid drag reducing agent as a modifier, a low-temperature strength induced nucleation material LTI for cement paste was prepared. Through transmission electron microscopy, the basic unit structures of its microstructure are stacked tin foil like and floc like structures, accompanied by a small amount of rod-shaped and "regular" square crystals, with a size of 100-200nm, and fibrous like substances extending around it, with a larger specific surface area. The thickening, compressive strength, and static cementation test results of cement slurry mixed with nucleus LTI indicate: by utilizing its own template nucleation function, nucleus LTI promotes the hydration process of cement, reduces the nucleation potential barrier of accumulated products, and promotes the transition of low-temperature thickening curve from "climbing" to "right angle", the thickening time ratio can be controlled within 0.47 at 10℃; under the condition 20℃, nucleus LTI can induce rapid development of early strength of cement paste. the compressive strength of cement paste mixed with 1.5% nucleus LTI increases by 89.1% within 24 hours, the 24-hour compressive strength of cement paste mixed with 5% crystal nucleus LTI is greater than 20MPa, which increases by 257.8%, under the condition of 30 ℃, when the content of crystal nucleus LTI is 1.5%, the 6-hour compressive strength of cement stone is higher than 4MPa, after increasing the content of LTI to 5%, the 6-hour compressive strength of cement stone reaches 6.5MPa, compared to the newly formed pure slurry water debris, the compressive strength has achieved leapfrog development; the SGS transition time of cement slurry mixed with nucleus LTI can be shortened to 18 minutes at 30℃, reducing to 23% of the net slurry, which helps to improve the anti channeling function. Nanoscale hydrated calcium silicate nucleus LTI with excellent performance can shorten the construction cycle of oil and gas wells in low temperature shallow or high cold areas, and improve the quality of cementing.

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  • 收稿日期: 2023-09-06
  • 最后修改日期: 2023-10-13
  • 录用日期: 2023-10-17
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