Research progress and development of deep and ultra-deep drilling fluid technology

Petroleum Exploration and Development, Год журнала: 2024, Номер 51(4), С. 1022 - 1034

Опубликована: Авг. 1, 2024

Язык: Английский

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Conformance Control and Improved Oil Recovery Mechanism of Branched Preformed Particle Gel in Fractured Reservoirs Utilizing Nuclear Magnetic Resonance Technology

Energy & Fuels, Год журнала: 2025, Номер unknown

Опубликована: Янв. 10, 2025

The limited sweep improvement in fractured reservoirs has always been the key factor restricting enhancement of their recovery factor. Particle plugging agents have attracted widespread attention due to excellent performance strongly fractures. Among them, branched preformed particle gels (B-PPG) widely applied conformance treatment recent years because elasticity and deformability. Nevertheless, precise microscopic mechanism behind ability enhance oil improve conformational effect within cores remains enigmatic. In this paper, a comprehensive evaluation B-PPG, encompassing static gel swelling evaluation, rheological property tests, dynamic injection experiments core samples, was conducted. Furthermore, impact varying permeabilities rates on efficacy B-PPG studied by combining low-field nuclear magnetic resonance (LFNMR) technology. Results showed that had outstanding water absorption capabilities, with multiple brine reaching 40 times. Post-swelling, also exhibited exceptional viscoelastic properties, achieving G′ value 70 Pa. Additionally, rate significantly affected efficiency strength B-PPG. LFNMR analysis confirmed that, at lower rates, penetrated deeper into matrix under high pressure. Meanwhile, it formed more robust zone core. particularly well-suited for permeability exceeding 0.1 × 10–3 μm2. However, an excessively low permeability, could inflict irreversible damage matrix, potentially hindering subsequent water-flooding operations. insight from research elucidated migration mechanisms offered theoretical support design strategies tailored reservoirs.

Язык: Английский

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Multi-hole synchronous linkage control fracturing in low permeability coal seams based on three-dimensional lattice method

Physics of Fluids, Год журнала: 2025, Номер 37(4)

Опубликована: Апрель 1, 2025

The multi-hole synchronous hydraulic fracturing in low permeability coal seams exhibits considerable variability under varying geological and technical conditions, leading to an anti-reflection effect of that is significantly lower than anticipated. To explore the mechanism stress interference between fractures distribution flow competition linkage control, controlled model developed by using three-dimensional discrete lattice method, process competitive fracture growth examined single-hole, double-control, four-hole conditions. findings indicate observation hole exacerbates reservoir's heterogeneity causes uneven expansion fractures. situ viscosity fluid influence propagation mode velocity during two-hole fracturing. Under elevated differentials, tends coalesce, but diminished remains comparatively autonomous. application high-viscosity can efficiently facilitate uniform While may converge at injection rates, excessive rates will exacerbate disequilibrium. control enhances connectedness increases gas seam through regulation approach. research establish a theoretical foundation for governed interconnection.

Язык: Английский

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Influence of reservoir physical properties on guar gum fracturing fluid damage in unconventional tight reservoirs

Physics of Fluids, Год журнала: 2024, Номер 36(4)

Опубликована: Апрель 1, 2024

Solid phase residue, fracturing fluid filtration, and incomplete backflow during hydraulic can easily cause damage to tight sandstone reservoir. Thus, it is necessary explore the relationship between physical properties of reservoirs caused by fluids. Based on identification reservoir properties, was studied core displacement, computerized tomography, nuclear magnetic resonance (NMR). The results show that higher clay mineral content is, denser formed corresponding porosity permeability are lower. When rock relatively high, overall radius pore throat in shifts left under action gel breaking fluid, showing a decreasing trend. However, when low, frequency peak smaller size increases upwards. decline rate two types 9.91%–8.78% 15.85%–14.74%. rates 5.53%–5.84% 10.40%–9.94%. According NMR results, speculated small throats blocked or even disappear, while proportion larger decreases. this study provide theoretical reference for protection process reservoirs.

Язык: Английский

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Reservoir Damage Induced by Water-Based Fracturing Fluids in Tight Reservoirs: A Review of Formation Mechanisms and Treatment Methods

Energy & Fuels, Год журнала: 2024, Номер unknown

Опубликована: Сен. 19, 2024

Язык: Английский

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Quantifying the impact of geological and construction factors on hydraulic fracture dynamics in heterogeneous rock layers using the phase field method

Computers and Geotechnics, Год журнала: 2024, Номер 169, С. 106223 - 106223

Опубликована: Март 14, 2024

Язык: Английский

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Preparation and performance evaluation of microencapsulated acid used for gel breaking of fracturing fluid in low-temperature reservoirs

Journal of Molecular Liquids, Год журнала: 2024, Номер 403, С. 124844 - 124844

Опубликована: Апрель 26, 2024

Язык: Английский

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Experimental and modeling study on the acid-etching and conductivity of hydraulic fractures in carbonate rocks: A critical review

Geoenergy Science and Engineering, Год журнала: 2024, Номер unknown, С. 213517 - 213517

Опубликована: Ноя. 1, 2024

Язык: Английский

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Realizing the release of drag reducers through weakly acidic-induced demulsification of inverse polymer emulsion

Colloids and Surfaces A Physicochemical and Engineering Aspects, Год журнала: 2025, Номер unknown, С. 136099 - 136099

Опубликована: Янв. 1, 2025

Язык: Английский

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Multiscale and quantitative study of thermal conductivity in shale using TDTR measurements and homogenization techniques

Applied Clay Science, Год журнала: 2025, Номер 267, С. 107719 - 107719

Опубликована: Фев. 1, 2025

Язык: Английский

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