Petroleum ChemistryPetroleum ChemistryНефтехимия0028-24213034-5626The Russian Academy of Sciences65564110.31857/S0028242123010100UNHIWPArticlesСтатьиResearch ArticleResearch on Nano Inhibition and Plugging Potassium Amine Polysulfonate Drilling Fluid System to Prevent Wellbore Instability in Deep Complex FormationsИсследование ингибирующей и тампонирующей систем промывки скважины буровым раствором на основе полисульфоната амина калия (NPAP-2) для предотвращения неустойчивости ствола скважины в глубоких сложных пластахShuoYangpetrochem@ips.ac.ruSongDengdengsong@cczu.edu.cnYixinZhang Xiaopeng Yanpetrochem@ips.ac.ruHongdaHaopetrochem@ips.ac.ruCaibaoWangpetrochem@ips.ac.ruLeiWangpetrochem@ips.ac.ruSchool of Petroleum Engineering, Changzhou University, Wujin DistrictChangzhou UniversitySinopec Research Institute of Petroleum Engineering, Chaoyang DistrictSinopec Research Institute of Petroleum Engineering15022023631NO1 (2023)№1 (2023)11013111022025Copyright ©; 2023, Russian Academy of SciencesCopyright ©; 2023, Российская академия наук2023Russian Academy of SciencesРоссийская академия наукhttps://journals.eco-vector.com/0028-2421/article/view/655641

The wellbore instability caused by complex strata is a common problem in drilling engineering, which not only causes economic losses, but also reduces the field drilling efficiency. This paper has taken Block A of Junggar Basin as an example to explore the causes of wellbore instability in complex strata and establish corresponding solutions. Studying the core samples in this area and analyzing the logging data, it is concluded that the micro-fractures developed in the rock layer of the block provide natural channels for the entry of filtrate. At the same time, the water-sensitive clay minerals in the formation have hydration after encountering the filtrate. By optimizing the composition, the corresponding nano-strong inhibition and strong plugging potassium amine polysulfonate drilling fluid system (NPAP-2) was established. The overall use of asphalt anti-sloughing agent, nano-and micro-scale cracks (gaps) for physical plugging, wetting inversion control surface water absorption, chemical inhibition of internal hydration. The performance test shows that the HTHP water loss of the drilling fluid system is less than 10 mL, the recovery rate of rock sample is more than 86%, the viscosity is reasonable, the expansion rate is more than 89%, and the filtration loss is reduced from 8.0 to 5.0 mL. The results show that the NPAP-2 can reduce the liquid activity to enhance the inhibition, effectively improve the settlement stability of drilling fluid, reduce the filtration and ensure the wellbore stability.

В качестве примера изучения причин неустойчивости ствола скважины в сложных пластах и поиска соответствующих решений был выбран блок А Джунгарского бассейна (Junggar Basin), Китай. По результатам исследования образцов керна на этом участке и анализа данных каротажа сделан вывод, что микротрещины, образованные в скальном слое блока, являются естественными каналами для поступления фильтрата. Показано, что после взаимодействия с фильтратом происходит гидратация чувствительных к воде глинистых минералов пласта. Благодаря оптимизации состава была предложена наноструктурированная высокоингибированная и сильная тампонирующая система бурового раствора на основе полисульфоната амина калия (NPAP-2), которая обеспечивала: общее использование асфальтового реагента против осыпания породы пласта для физического закупоривания нано- и микромасштабных трещин (зазоров); инверсионное смачивание для регулирования поглощения поверхностных вод; химическое ингибирование внутренней гидратации. Эксплуатационные испытания показали, что при этом потери воды при высокой температуре и высоком давлении (HTHP) в системе бурового раствора составляют менее 10 мл, степень извлечения образца породы - более 86%, вязкость остается приемлемой, скорость расширения ствола скважины составляет - более 89%, потери от фильтрации снижаются с 8 до 5 мл. Показагно, что NPAP-2 может сизить активность жидкости для усиления ингибирования, эффективно повысить устойчивость бурового раствора к оседанию, уменьшить фильтрацию и обеспечить устойчивость ствола скважины.

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