Study on Experimental Construction of a Novel Brine-based Drilling Fluid for Salt-Anhydrite Formation

Lin, Feng Yen; Chang, Congbing; Xu, Lin; Wang, Shengxiang

doi:10.1088/1755-1315/384/1/012130

Cited by 3 publications

(11 citation statements)

References 3 publications

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“…В результате понимания механизма разрушения ствола скважины на глинистых участках появилась практика применения растворов с добавлением солей, которые стали называть ингибирующими [18,19]. Однако даже катионы кальция, натрия и калия, попадающие в сланцы из раствора, оказывают разное влияние из-за разного диаметра гидратированных ионов [20][21][22].…”

Section: обоснование необходимости изучения и применения утяжеленных безбаритных буровых растворовunclassified

“…Слой ангидритов мощностью 800 м является ловушкой на месторождении, однако из-за этого возникает угроза нестабильности пласта, связанная со способностью соли течь в условиях нахождения под вышележащим давлением и из-за горизонтального напряжения, а также ее растворения вследствие использования РВО, что неизбежно приведет к ряду аварий во время бурения (рис. 4) [21].…”

Section: исследование составов и свойств безбаритных буровых растворовunclassified

“…6. Влияние плотности растворов на параметры: ПВ -пластическая вязкость, СНС -статическое напряжение сдвига, Ф -фильтрация, ДНС -динамическое напряжение сдвига бурильной колонны, повреждению обсадных колонн и ухудшению свойств бурового раствора [21]. Мягкий аргиллит часто теряет свою опору из-за возможного растворения и обрушения пласта, поэтому является существенной угрозой для бурения.…”

Section: исследование составов и свойств безбаритных буровых растворовunclassified

“…Именно поэтому было принято решение создать новый буровой раствор на основе рассолов для обеспечения безопасного и экономически выгодного бурения. Исследователями были определены следующие критерии для новой системы бурового раствора [21,43]:…”

Section: исследование составов и свойств безбаритных буровых растворовunclassified

“…Для увеличения свойств системы, таких как ингибирование, плотность, насыщенность, можно использовать смесь солей. Как правило, для приготовления раствора используются три моновалентные катионные соли: хлорид натрия (NaCl), хлорид калия (KCl) и формиат натрия (HCOONa), которые экономически эффективны с точки зрения затрат при регулировании плотности [19,21]. Формула раствора на основе рассола с фиксированной соленостью: пресная вода + 25wt.% NaCl + 5wt.% KCl + 8wt.% HCOONa, через которую можно получить насыщенный рассол.…”

Section: исследование составов и свойств безбаритных буровых растворовunclassified

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Research of Bare-Free Drilling Fluids

Leusheva

Л²,

Alikhanov

et al. 2021

Недропользование

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Mining and geological conditions for the development of new fields are becoming more difficult every year. Accordingly, the requirements for ensuring the environmental and technological safety of the drilling process are becoming more and more important. To ensure such a process, it is necessary to use correctly selected drilling fluids with proper characteristics: rheological parameters sufficient for effective cleaning of the well bottom, density sufficient to create back pressure, fluid loss to ensure a high-quality filter cake. Modern environmental requirements dictate the abandonment of hydrocarbon-based solutions. But when using water-based solutions, there are no suitable solutions, especially with their high density, since the use of barite can lead to a decrease in reservoir productivity. In this regard, the analysis of the problem and the search for options for creating water-based drilling fluids, weighted without the addition of barite, having the properties of maintaining the stability of the wellbore, ensuring safe drilling and opening productive formations without damaging the reservoir characteristics, was carried out. Such a solution was found in changing the base of the drilling fluid - highly mineralized fluids or solutions based on saturated brines. Brines must be created on the basis of inorganic salts that have good solubility, for example, chlorides, bromides. Due to the content of salts, the fluids have an inhibitory effect, and depending on the volume of dissolution, the density of the drilling fluids can be controlled. The scientific works of foreign and domestic scientists analyzed in the article have been published over the past five years, which indicates the relevance of this development. The selected compositions are presented and theoretically investigated, which were also tested in the field conditions.

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Section: обоснование необходимости изучения и применения утяжеленных безбаритных буровых растворовunclassified

Section: исследование составов и свойств безбаритных буровых растворовunclassified

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Research of Bare-Free Drilling Fluids

Leusheva

Л²,

Alikhanov

et al. 2021

Недропользование

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Drill-In Fluid Optimization for Formation Damage Control Considering Salt Dissolution in Saline-Lacustrine Reservoirs

Tan,

Yang,

You

et al. 2023

SPE Journal

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Summary Salt dissolution induced by drill-in fluid loss is a frequent occurrence in saline-lacustrine reservoirs, which can potentially result in serious formation damage. In light of this, an experimental study was conducted to investigate the salt mineral dissolution and dynamic damage in the rock samples collected from a saline-lacustrine carbonate reservoir and the response of pore-fracture structures using the in-situ drill-in fluids. The study further involved analyzing the formation-damage-control (FDC) ability of the in-situ drill-in fluids. The results indicated that although salt dissolution significantly increased the pore size of the tight matrix and the width of natural fractures, improving the conductivity of seepage channels, the increase in pore-fracture size may have greatly aggravated the drill-in fluid loss during the process. The continuous serious filtrate loss, lower pressure-bearing capacity of the plugging zone, and lower permeability recovery rate (PRR) of rock indicated poor FDC performance of in-situ brine drilling fluids for the salt-dissolved core samples. The FDC performance of drill-in fluids for saline-lacustrine carbonate reservoirs was optimized based on the response of reservoir pore-fracture structure to salt dissolution and the theory of slightly underbalanced activity. The experimental results showed that the optimized drill-in fluids had better FDC ability, with an average PRR increase of 14.04%. Field application indicated that the optimized drill-in fluids reduced the drill-in fluid loss by 76.48%, shortened the drilling cycle by 45.20%, and increased the initial production capacity per well by 7.70%. This study can provide insightful guidance to optimize the FDC performance of drill-in fluids for saline-lacustrine hydrocarbon reservoirs during drilling.

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Barite-Free Muds for Drilling-in the Formations with Abnormally High Pressure

Leusheva

Alikhanov

Morenov

2022

Fluids

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This paper discusses problems associated with water-based drilling fluids used for drilling formations with abnormally high pressure. The available solutions are suitable for a narrow range of applications, especially when weighted muds should be used. This paper reviews the experience of searching and developing a new type of drilling mud based on saturated brines. With the referenced papers as the basis, the authors developed compositions of such brine-based drilling muds. A distinctive feature of the considered compositions is the absence of barite, which is often used as a weighting agent. The paper presents a methodology for creating and investigating the proposed drilling fluids. The rheological properties and thermal stability of the muds at various temperatures were studied. The results show that proposed drilling fluids can be efficiently used for drilling formations with abnormally high pressure. It is assumed that the developed muds have greater versatility than analogues.

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Study on Experimental Construction of a Novel Brine-based Drilling Fluid for Salt-Anhydrite Formation

Cited by 3 publications

References 3 publications

Research of Bare-Free Drilling Fluids

Research of Bare-Free Drilling Fluids

Drill-In Fluid Optimization for Formation Damage Control Considering Salt Dissolution in Saline-Lacustrine Reservoirs

Barite-Free Muds for Drilling-in the Formations with Abnormally High Pressure

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