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EFFECT OF MICROBLOCK ON THE COMPRESSIVE STRENGTH OF PORTLAND CEMENT AT ELEVATED TEMPERATURES

机译：高温下微块对硅酸盐水泥抗压强度的影响

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Cementation of casing string depends on composition and properties of cement slurry. The properties of Portland cements must often be modified to meet the demands of a particular well application. These modifications are accomplished by the admixing of additives that effectively alter the hydration chemistry. Silica (SiO_2) is used most frequently for the prevention of strength retrogression. It can have a different particle size ("silica sand", with an average particle size of about 100 μm; "silica flour", with an average particle size of about 15 μm; and "silica fume", with mean particle size between 0,1 μm and 0,2 μm). Commercially available additive "Microblock" was used in lab tests. It is a liquid cement additive made from a finely divided, high surface-area silica (D50: cca 0.15 μm; D90: cca 0.75 μm). "Microblock" can help prevent high-temperature strength retrogression, control lost circulation as well as gas migration and can provide a degree of fluid-loss control. The Portland cement slurries with 10%, 20%, 30% and 40% of "Microblock" have been tested. Results of laboratory tests have shown that silica fume (also known as microsilica) affects the slurry properties such as thickening time, rheology, fluid loss, free water, slurry stability, and set cement compressive strength. The development of high early compressive strength is important to ensure structural support to casing and hydraulic/mechanical isolation of downhole intervals. The development of compressive strength of Portland cement slurries with and without "Microblock" at different curing temperature (90 °C, 120 °C and 150 °C) has been determined by Ultrasonic cement analyzer. Results have shown that "Microblock" affects the properties of cement slurry and set cement. The compressive strength has been higher with the addition of "Microblock" than compressive strength of neat PC slurry, but negative effect has been exhibited on slurry rheology and early strength development at elevated temperatures.
机译：套管柱的胶结取决于水泥浆的组成和性能。必须经常对波特兰水泥的性能进行修改，以满足特定油井应用的需求。这些改性是通过掺混有效改变水合化学性质的添加剂来实现的。二氧化硅（SiO_2）最常用于防止强度下降。它可以具有不同的粒径（“硅砂”，其平均粒径约为100μm;“硅粉”，其平均粒径约为15μm;“硅粉”，其平均粒径为0 ，1μm和0.2μm）。可商购的添加剂“ Microblock”用于实验室测试。它是由细分的高表面积二氧化硅（D50：cca 0.15μm; D90：cca 0.75μm）制成的液态水泥添加剂。 “ Microblock”可以帮助防止高温强度的倒退，控制漏失循环以及气体迁移，并可以提供一定程度的流体损失控制。已测试了含有10％，20％，30％和40％的“ Microblock”的波特兰水泥浆。实验室测试结果表明，硅粉（也称为微硅粉）会影响浆液特性，例如增稠时间，流变性，流失，游离水，浆液稳定性和水泥抗压强度。高早期抗压强度的发展对于确保对套管的结构支撑以及对井下层段的液压/机械隔离很重要。已经通过超声水泥分析仪确定了具有和不具有“微块”的波特兰水泥浆在不同的固化温度（90°C，120°C和150°C）下的抗压强度的发展。结果表明，“微块”会影响水泥浆和固化水泥的性能。添加“ Microblock”的抗压强度比纯净PC浆料的抗压强度要高，但在高温下对浆料流变性和早期强度发展表现出负面影响。

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