| 基于紧密堆积理论的低密度固井水泥浆设计 |
| 投稿时间：2020-10-29 修订日期：2021-01-21 点此下载全文 |
| 引用本文：郑少军,王凯伦,刘思雨,等.基于紧密堆积理论的低密度固井水泥浆设计[J].钻探工程,2021,48(3):94-100.ZHENG Shaojun,WANG Kailun,LIU Siyu,et al. Design of low density cementing slurry based on close packing theory[J]. Drilling Engineering, 2021,48(3):94-100. |
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| 基金项目:国家重点研发计划项目“乳品废水乳糖母液基微生物固井技术”（编号：2016YFE0204300）;国家自然科学基金项目“水合物分解对深水固井水泥环孔隙特征与力学性质的影响机制研究”（编号：42072343） |
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| 中文摘要:合理的颗粒级配是提高固井水泥环内部密实度、早期力学强度和界面胶结能力的关键。基于此，本文从几种典型的连续颗粒级配的紧密堆积理论中优选出DFE进行固井水泥浆体系设计，并通过大量实验首次确定了适宜G级油井水泥基深水固井水泥浆体系设计的n值最优范围：0.33~0.40。结合激光粒度分析仪实测结果，在粒径≤3.38 μm、3.38~70.70 μm、≥70.70 μm三个范围内依次采用纳米CaCO3（nano CaCO3，以下简称“NC”）、G级油井水泥和漂珠，并按DFE（n=0.33~0.40）体积分布曲线进行混配。在此基础上，提出一种密度为1.50 g/cm3的低成本低温早强三元固相级配水泥浆体系，并与漂珠二元固相水泥浆体系和NC二元固相水泥浆体系的性能进行对比。研究结果表明：该三元体系水泥石的抗压强度、抗折强度和二界面胶结强度相比于漂珠二元体系和NC二元体系分别提高了7%~21.1%、13.4%~51.9%和41.4%~122.2%。三元体系的固井水泥石在垂向上的最大密度差为0.022 g/cm3。基于DFE设计的三元体系具有良好的流变性、稳定性和力学性能。DFE对于多元固井水泥浆体系的设计和应用具有一定的指导意义，在保证低密度的前提下能够有效地提高固井水泥石的早期强度和综合性能。 |
| 中文关键词:固井水泥浆 紧密堆积理论 Dinger-Funk方程 粒度分布 力学性能 |
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| Design of low density cementing slurry based on close packing theory |
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| Abstract:Reasonable particle size distribution is the key to improve the internal compactness， early mechanical strength and interfacial bonding ability of cementing cement sheath. Based on this， Dinger-Funk equation （hereinafter referred to as “DFE”） is selected to design cementing slurry system from several typical close packing theory of continuous particle gradation. Through a large number of experiments， the optimal range of n value suitable for the design of cement slurry for oil and gas wells is determined for the first time： 0.33~0.40. Combined with the measured results of laser particle size analyzer， nano CaCO3 （hereinafter referred to as “NC”）， grade G oil well cement and floating beads are successively used in the three particle size ranges of ≤3.38μm， 3.38~70.70μm and ≥70.70μm， and mixed according to the volume distribution curve of DFE （n=0.33~0.40）. On this basis， a low-cost， low-temperature and early strength ternary solid-phase graded cement slurry with a density of 1.50g/cm3 was proposed， and its performance is compared with that of the floating bead binary cement slurry and NC binary cement slurry. The results show that： the compressive strength， flexural strength and interfacial bonding strength of the ternary system are increased by 7%~21.1%，13.4%~51.9% and 41.4%~122.2% respectively compared with the binary system of floating beads and NC. The maximum vertical density difference of cementing cement is 0.022g/cm3. The ternary system based on DFE has good rheology， stability and mechanical properties. DFE has certain guiding significance for guiding the design and application of multiple cementing cement slurry system， and can effectively improve the early strength and comprehensive performance of cementing cement under the premise of ensuring low density. |
| keywords:cement slurry close packing theory Dinger-Funk equation particle size distribution mechanical properties |
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