Understanding the Effect of Rock Fabric on Fracture Complexity for Improving Completion Design and Well Performance

Suárez‐Rivera, Roberto; Burghardt, Jeffrey; Stanchits, Sergei; Edelman, Eric; Surdi, A.

doi:10.2523/17018-ms

Cited by 30 publications

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“…A number of experimental studies have been conducted on the interaction between hydraulic fractures and natural fractures (Lamont and Jessen 1963;Daneshy 1974;Blanton 1986;Warpinski and Teufel 1987;Renshaw and Pollard 1995;Beugelsdijk et al 2000;Athavale and Miskimins 2008;Zhou et al 2008Zhou et al , 2011Olson et al 2012;Suarez-Rivera et al 2013). Some of these studies focus on the mechanical interaction when a hydraulic fracture intersects a pre-existing fracture, while others also consider the fluid flow in the hydraulic fracture and natural fractures.…”

Section: Introductionmentioning

confidence: 97%

Experimental investigation of hydraulic fracture propagation in fractured blocks

Dehghan

Goshtasbi

Ahangari

et al. 2014

Bull Eng Geol Environ

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Natural fractures in reservoirs can be the cause of many adverse effects during hydraulic fracturing treatment. In the present paper, hydraulic fracturing tests are used to investigate the interaction of a propagating hydraulic fracture with a natural fracture in the fractured blocks. Systematic experiments were designed and performed on the cement blocks with different pre-existing fracture strikes and dips (30°, 60°and 90°). The effect of horizontal stress difference on the propagation of hydraulic fractures was also determined through a series of experiments with different values for Dr, which were 5 and 10 MPa, respectively. Propagation arrest of the hydraulic fracture and crossing the pre-existing fracture were two dominating fracture behaviors at horizontal stress differences of 5 and 10 MPa, respectively. It was observed that both the magnitude of differential stress and the preexisting fracture geometry can magnify the effect of a preexisting fracture on hydraulic fracture propagation. When the horizontal differential stress is low (5 MPa), the hydraulic fracture crosses the pre-existing fracture at a high pre-existing fracture dip (90°) and at an intermediate to high pre-existing fracture strike (60°-90°), while hydraulic fracture is arrested by the opening of the pre-existing fracture at a pre-existing fracture strike (30°). Meanwhile, when the pre-existing fracture dip is low to intermediate (30°-60°) and its strike is low to high (30°-90°), hydraulic fracture is arrested by the opening and shear slippage of the pre-existing fracture in this situation. However, at a high horizontal differential stress (10 MPa), when the preexisting fracture dip is low to high (30°-90°), the hydraulic fracture crosses the pre-existing fracture at the strike of the pre-existing fracture of 60°-90°, and when it is decreased to 30°, the hydraulic fracture is arrested by th eopening and shear slippage of the pre-existing fracture. Therefore, the pre-existing fracture's strike and dip play a significant role in the propagation of hydraulic fracture at a low horizontal stress difference, while the role of the pre-existing fracture dip at a high horizontal stress difference is less than the pre-existing fracture strike on the propagation of hydraulic fracture. Keywords Hydraulic fracture propagation Á Laboratory experiments Á The pre-existing fracture strike and dip Á Horizontal stress difference List of symbols l Fluid viscosity, m/Lt (Pa s) r h Minimum principal stress in horizontal direction, m/Lt 2 (Pa) r H Maximum principal stress in horizontal direction, m/Lt 2 (Pa) r v Principal stress in vertical direction, m/Lt 2 (Pa) D r Horizontal stress difference, m/Lt 2 (Pa) p Fluid pressure, m/Lt 2 (psi) q Flow rate of fluid, L 3 /t (m 3 /s) E Young's modulus of elasticity, m/Lt 2 (Pa) m Poisson's ratio r c Unconfined compressive strength, m/Lt 2 (Pa)

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Section: Introductionmentioning

confidence: 97%

Experimental investigation of hydraulic fracture propagation in fractured blocks

Dehghan

Goshtasbi

Ahangari

et al. 2014

Bull Eng Geol Environ

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“…Это предположение подтверждается испытаниями керна на трехосном прессе [Suarez-Rivera et al, 2013], интерпретацией результатов микросейс-мики и анализом промысловых данных [Mayerhofer et al, 2010], а также численными экспериментами [Mohaghegh, 2013]. Анизотропные свойства пород могут оказать существенное влияние и на характер разруше-ния при сжатии -вывалов [Soroush, 2013], что свиде-тельствует о необходимости получения детальных сведений об анизотропии формации для применения одного из наиболее надежных методов определения максимального горизонтального напряжения [Zoback, Apel, 1993;Wiprut, Zoback, 2000].…”

Section: особенности моделирования гидрогеомеханических процессов воunclassified

Оn a hydro-geomechanical modeling of shale formations

2015

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В настоящей работе реализован первый этап построения самосогласованной сейсмогидрогео-механической модели разработки нетрадиционных сланцевых формаций. Сформулированы основные принципы гидрогеомеханического моделирования. Выявлены основные физико-механические фак-торы, определяющие особенности моделирования нетрадиционных коллекторов. Проведена класси-фикация трещиновато-пористых сред по отношению к представительному элементарному объему. Поставлены задачи моделирования недеформируемых и деформируемых формаций. В последнем случае предложен новый подход к определению эффективных упруго-прочностных свойств.4D Gory, 1, Moscow, 119991, Russia, e-mail: versh1984@mail.ru 3 National Research Nuclear University " MEPhI", Kashira Highway, 31, Moscow, 115409, Russia, e-mail: zingerman@rambler.ru In the paper the first stage of the self-consistent seismic and hydro-geomechanical model of unconventional shale formations production is considered. Main principles of hydro-geomechanical modeling are formulated. Basic physical and mechanical factors that determine details of unconventional reservoirs modeling are presented. Classification of fractured porous media with respect to the representative elementary volume is performed. Problem statements of non-deformable and deformable formations modeling are discussed. Finally, a new approach for an estimation of effective elastic-strength properties is suggested. 4D seismic, reservoir modeling, geomechanics, unconventional reservoir, fractured porous medium, nonlinear multiphase flow, diffusion, stress-strain state, hydraulic fracturing, alternative technologies to develop shale formations ВВЕДЕНИЕЦелью данной работы является выявление и ана-лиз особенностей построения гидрогеомеханических моделей, способных служить адекватной основой тех-нологий разведки и разработки баженовской свиты Фроловской мегавпадины Западно-Сибирского нефте-газоносного бассейна. Построение таких моделей в настоящее время вызывает серьезные затруднения, что связано в первую очередь с недостатком исходных данных о строении и свойствах пород залежи. В ре-зультате сравнительного анализа геологических, лито-логических, геохимических, петрофизических и про-мысловых данных, накопленных при изучении нетра-диционных нефтенасыщенных горных пород, удалось выявить некоторые физико-механические особенно-сти, присущие в той или иной степени всем сланцевым формациям и определяющие особенности их гидро-геомеханического моделирования по сравнению с тра диционными коллекторами. В связи с этим в настоящей работе реализована парадигма а posse ad esse -гидрогеомеханическая мо-дель предоставляет возможность реализации всех вы-явленных физико-механических особенностей в наи-более общем виде, с непременным выделением линеек определяющих параметров различной природы (фи-зических, вычислительных, геометрических), последо-вательное отключение (или подключение) которых поз во ляет упростить (или усложнить) модель для оп-тимально адекватного необходимого уровня [Мельни-кова, 2010].Данная работа является первым шагом на пути по...

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“…They observed that if an advancing induced hydraulic fracture encounters with pre-existing natural fractures, it may result in bypassing, diverting and/or coalescence. Suarez-Rivera et al (2013) demonstrated the importance of rock fabric to understand and predict fracture complexity and fracture height containment by conducting hydraulic fracturing tests on large blocks from tight shale outcrop under simulated effective stress conditions.…”

Section: Introductionmentioning

confidence: 99%

“…According to tensile strength criterion, hydraulic fractures on the wellbore wall initiate when the principal tensile stress within the rock (due to the fluid pressure within the rock) exceeds the minimum principal stress plus the tensile strength of the rock (Haimson, 1967;Hossain, Rahman, & Rahman, 1967, 2000Hubbert & Willis, 1957). A series of lab experimental studies have been conducted in the past to investigate the influence of natural fracture on the fracture initiation and propagation under different reservoir conditions (Beugelsdijk, De Pater, & Sato, 2000;Blanton, 1986;Dehghan, Goshtasbi, Ahangari, & Jin, 2014Gu et al, 2012;Olson, Bahorich, & Holder, 2012;Suarez-Rivera, Burghardt, Stanchits, Edelman, & Surdi, 2013;Tie, Wei, & Xueliang, 2011;Warpinski & Teufel, 1987;Zhou, Chen, Jin, & Zhang, 2008;Zhou, Jin, & Chen, 2010). Some experimental investigations (Blanton, 1982;Daneshy, 1974;Lamont & Jessen, 1963) have demonstrated that the advancing induced hydraulic fracture crosses the natural fracture without any significant change in its direction, turns into the natural fracture and dilates it or, in some cases, turns into the natural fracture and beside the dilation of natural fracture, breaks out again by a fracture or flaw along the natural fracture.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of fracture initiation and propagation using a tri-axial hydraulic fracturing test system in naturally fractured reservoirs

Dehghan

Goshtasbi

Ahangari

et al. 2015

European Journal of Environmental and Civil Engineering

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A series of laboratory hydraulic fracture experiments was conducted on synthetic rock samples to investigate the mechanism of hydraulic fracture initiation and propagation of a pressurised wellbore in non-fractured and fractured reservoirs. To achieve this goal, the influence of pre-existing fracture (both on and far from the wellbore wall) and horizontal differential stress was investigated on the fracture initiation and propagation in different stress regimes. In reservoirs with no fracture due to the high stress concentration in surrounding rock of the well, the fracture initiation and propagation pressure are increased. In fractured reservoirs, the presence of pre-existing fracture on the wellbore wall reduced the effect of the original stress concentration around the wellbore, which led to a drastic decrease in the fracture initiation and propagation pressure. In the far-wellbore region by increasing dip and strike of the pre-fracture, the fracture propagation pressure was decreased when it intersected the pre-fracture and arrest behaviour of the fracture was also decreased. In-situ horizontal differential stress, (r HÀ r h ) played an important role on the fracture propagation behaviour and the fracture initiation and propagation pressure both in non-fractured and fractured reservoirs. Unlike low differential stress, at high differential stress due to decreasing the interaction between hydraulic and pre-existing fractures, the dominant behaviour of fracture propagation was changed from arrest to crossing mode. In addition, at high differential stress because of decreasing the stress state concentration around the wellbore, initiation and propagation pressure of the hydraulic fracture were decreased.

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Understanding the Effect of Rock Fabric on Fracture Complexity for Improving Completion Design and Well Performance

Cited by 30 publications

References 0 publications

Experimental investigation of hydraulic fracture propagation in fractured blocks

Experimental investigation of hydraulic fracture propagation in fractured blocks

Оn a hydro-geomechanical modeling of shale formations

Mechanism of fracture initiation and propagation using a tri-axial hydraulic fracturing test system in naturally fractured reservoirs

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