利用温度触发防沉降技术提高泥浆泵送效率,提高水泥覆盖率,确保层间隔离

Xiangyu Liu, Dominique Matthews, S. Craig, R. Martanto, Dominic E. L. Ong, David Edgar
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引用次数: 0

摘要

稳定的水泥浆对于固井作业的成功至关重要,从固井到长期的层间隔离。传统的抗沉降(AS)添加剂,如粘土和多糖,通常用于改善水泥浆的稳定性,但由于高温热稀释效应或热降解,它们仅在中低温(高达260°F)的应用中有效。为了补偿这种热稀释或热降解效应,通常使用更高剂量的AS添加剂,这无意中增加了浆液放置的难度,而对浆液稳定性的改善却微乎其微。本文介绍了一种新型的、热激活的、自由流动的、易于使用的温度触发抗沉降剂(TTAS)的性能,它可以帮助减少总体AS添加剂的使用,防止固体沉降,并在200-350°F或更高的温度下减少自由流体的形成,同时在激活前对泥浆流变学的影响最小。在16-lbm/gal和18-lbm/gal H级水泥浆中,与传统的AS添加剂(包括膨润土粘土、日坦胶和一种商业AS产品)相比,对这种新型的TTAS剂的性能进行了评估。静态沉降(SS)和动态沉降(DS)试验表明,常规含AS剂的矿浆存在可混合性问题,在井下有明显的沉降和凝胶化倾向。相比之下,含TTAS剂的浆料表现出良好的可混合性,在80°F时对流变性没有不利影响,并且浆料稳定性得到改善,在低至0.3% bwoc的动态沉降试验中,锥体高度小于1 / 2英寸,差密度小于1磅/加仑(Δρ)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhancing Slurry Pumping Efficiency, Improving Cement Coverage, and Ensuring Zonal Isolation with Temperature-Triggered Anti-Settling Technology
A stable cement slurry is critical to the success of a cementing job, from cement placement to long-term zonal isolation. Conventional anti-settling (AS) additives, such as clays and polysaccharides, are commonly applied to improve cement slurry stability, but they are only effective for low-to-mid temperature applications (up to 260°F) due to high temperature thermal thinning effects or thermal degradation. To compensate for such thermal thinning or thermal degradation effects, higher doses of AS additives are often applied, which inadvertently increase slurry placement difficulty with minimal improvement to slurry stability. This paper presents the performance of a novel, thermally activated, free-flowing, and easy-to-use temperature-triggered anti-settling (TTAS) agent that can help reduce the overall AS additive usage, prevent solids settling, and mitigate the formation of free fluid at 200-350°F or higher while having minimal effect on slurry rheology prior to activation. The performance of this novel TTAS agent was evaluated against conventional AS additives, including bentonite clay, diutan gum, and a commercial AS product in 16-lbm/gal and 18-lbm/gal Class H cement slurries. Static sedimentation (SS) and dynamic sedimentation (DS) tests revealed that the conventional AS agent-containing slurries exhibited mixability concerns, noticeable settling at downhole condition and gelation tendency. By contrast, the TTAS agent-containing slurries exhibited good mixability, no adverse effect on rheology at 80°F, and improved slurry stability, evidenced by less than ½ inch cone height and less than 1-lbm/gal differential density (Δρ) in dynamic sedimentation test using as low as 0.3% bwoc dosage.
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