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Mechanism for the promotional effect of a novel solidifiable spacer fluid system on the cementation quality of cement sheath/formation interface
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-09-01 , DOI: 10.1002/ese3.805 Juan Li 1 , Zaoyuan Li 2 , Shizhong Tang 1 , Jinfei Sun 2 , Hua Wu 1 , Donghua Su 2 , Wen Chen 2
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-09-01 , DOI: 10.1002/ese3.805 Juan Li 1 , Zaoyuan Li 2 , Shizhong Tang 1 , Jinfei Sun 2 , Hua Wu 1 , Donghua Su 2 , Wen Chen 2
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A cement‐formation rock interface is the weakest part of an oil and gas well where the channeling of formation oil, gas, and water is most likely to occur. In particular, the channeling problem is most prominent at the interface between the cement sheath and the formation. Owing to the existence of a layer of thick virtual filter cake on the wall of an oil and gas well, the cementation quality of the cement sheath/formation interface is generally unsatisfactory, which increases the risk of well integrity failure. A solidifiable spacer fluid system was proposed in this paper to improve the cementation quality of the cement sheath/formation interface. The macroscopic mechanism governing the promotional effect of the proposed system on the shear strength of the cement sheath/formation interface was analyzed through shear strength experiments and compatibility experiments. Moreover, scanning electron microscopy, X‐ray diffraction, and computed tomography tests were conducted to provide an in‐depth characterization of the interfacial morphologies, products, and pores. The results showed that a solidifiable spacer fluid had good compatibility with the drilling fluid and cement slurry, which ensured that the interfacial zone could be solidified as a whole. Compared with specimens prepared without a spacer fluid and using a field spacer fluid, specimens that were prepared using a solidifiable spacer fluid and allowed to cure at 70°C for 2 days showed an increase in shear strength by 388% and 110%, but a decrease in interfacial void fractions by 248% and 46%, respectively. The C‐S‐H gel (hydrated calcium silicate gel) formed by the solidification of the solidifiable spacer fluid system could be filled between the particles of clay minerals and the weighting materials to prevent the formation and extension of cracks in the interfacial zone effectively, thereby improving the cementation quality of the cement sheath/formation interface.
中文翻译：
新型可固化隔离液系统对水泥护套/地层界面胶结质量的促进作用机理
水泥-地层岩石界面是油气井中最薄弱的部分，最有可能发生地层油，气和水的窜流。特别地，在水泥护套与地层之间的界面处，窜流问题最为突出。由于在油气井壁上存在一层较厚的虚拟滤饼，因此，水泥鞘/地层界面的胶结质量通常不能令人满意，这增加了油井完整性故障的风险。本文提出了一种可固化的隔离液体系，以提高水泥护套/地层界面的胶结质量。通过剪切强度实验和相容性实验，分析了控制该体系对水泥皮/地层界面剪切强度的促进作用的宏观机理。此外，进行了扫描电子显微镜，X射线衍射和计算机断层扫描测试，以提供界面形态，产物和孔隙的深入表征。结果表明，可固化的隔离液与钻井液和水泥浆具有良好的相容性，保证了界面带整体固化。与不使用隔离液并使用现场隔离液制备的标本相比，使用可固化隔离液制备并在70°C固化2天的标本的抗剪强度提高了388％和110％，但界面空隙率分别降低了248％和46％。由可固化隔离液系统固化形成的C‐H‐H凝胶（水合硅酸钙凝胶）可以填充在粘土矿物颗粒和加重材料之间，以有效防止界面区域内裂纹的形成和扩展，从而改善了水泥护套/地层界面的胶结质量。
更新日期：2020-09-01
中文翻译：
新型可固化隔离液系统对水泥护套/地层界面胶结质量的促进作用机理
水泥-地层岩石界面是油气井中最薄弱的部分，最有可能发生地层油，气和水的窜流。特别地，在水泥护套与地层之间的界面处，窜流问题最为突出。由于在油气井壁上存在一层较厚的虚拟滤饼，因此，水泥鞘/地层界面的胶结质量通常不能令人满意，这增加了油井完整性故障的风险。本文提出了一种可固化的隔离液体系，以提高水泥护套/地层界面的胶结质量。通过剪切强度实验和相容性实验，分析了控制该体系对水泥皮/地层界面剪切强度的促进作用的宏观机理。此外，进行了扫描电子显微镜，X射线衍射和计算机断层扫描测试，以提供界面形态，产物和孔隙的深入表征。结果表明，可固化的隔离液与钻井液和水泥浆具有良好的相容性，保证了界面带整体固化。与不使用隔离液并使用现场隔离液制备的标本相比，使用可固化隔离液制备并在70°C固化2天的标本的抗剪强度提高了388％和110％，但界面空隙率分别降低了248％和46％。由可固化隔离液系统固化形成的C‐H‐H凝胶（水合硅酸钙凝胶）可以填充在粘土矿物颗粒和加重材料之间，以有效防止界面区域内裂纹的形成和扩展，从而改善了水泥护套/地层界面的胶结质量。
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