Initiation of a secondary hydraulic fracture and its interaction with the primary fracture

Aghighi, Mohammad Ali; Rahman, Sheik S.

doi:10.1016/j.ijrmms.2010.04.008

Cited by 20 publications

(7 citation statements)

References 20 publications

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“…It can be seen from Table 1 that the average density of Daqing peripheral oilfield reservoir sandstone and Jixi fault outcrop sandstone rock samples is more than 2.48 g/ cm 3 , both of which are tight sandstones. The average values of elastic modulus, poison's ratio, uniaxial compressive strength, and tensile strength of two types of rock 22,23 we selected the degradable fiber temporary plugging agent during our experiment, one material which can form spatial network structure to seal crack channel.…”

Section: Experimental Device and Sample Preparationmentioning

confidence: 99%

“…The refracturing technique has been proved to be an effective method for the well performance improvement of hydraulic fractured wells in the low and ultra‐low permeability oilfields . Laboratory experiments and field tests study by researchers in the world show that reoriented new refractures, which are different from the original fractures, can increase the recovery of oil and gas in tight sandstone reservoir .…”

Section: Introductionmentioning

confidence: 99%

“…2 Laboratory experiments and field tests study by researchers in the world show that reoriented new refractures, which are different from the original fractures, can increase the recovery of oil and gas in tight sandstone reservoir. 3,4 The existing studies show that the fractures always initiate perpendicular to the minimum horizontal stress, and the distribution of the in-situ stress field in the reservoir determines the initiation and propagation of fractures. 5 Elbel developed a two-dimensional coupled model which showed that the stress difference at different positions varied with time and the original stress difference was the most important factor for the initiation of new fractures.…”

Section: Introductionmentioning

confidence: 99%

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Study on the mechanisms of refracturing technology featuring temporary plug for fracturing fluid diversion in tight sandstone reservoirs

Zhao

et al. 2018

Energy Science & Engineering

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Well production rates in unconventional plays usually decline dramatically in the first year. Refracturing, which is a remedial production operation, is often done because original hydraulic fracturing failed to contribute any significant amount of flow or significant unfractured pay exists in the well. In order to maximize the fracturing fluid contact with the intact rock and to stimulate more reservoir volume in previously stimulated wells, a refracturing technology featuring a novel temporary plugging for fluid diversion is developed to enable the fracturing fluid to reach the untouched areas and to create reoriented fractures. In this paper, laboratory physical simulation tests of refracturing using fiber for effective temporary plugging is carried out to study the refracture morphology and the influencing factors of refractures. Results show that the refracture morphology is affected by the horizontal stress difference, the injection rate of initial fracturing fluid, and the natural fractures. Under condition of the different horizontal stress differences, the fracture initiation and orientation angle are different. When the horizontal stress difference is small, it is easy to form large angle fractures. The injection rate of initial fracturing fluid affects the length of initial fractures and refractures. The smaller the initial fracturing fluid injection rate is, the better the effect of temporary plugging in refracturing. The presence of natural fractures will lead to reorientation of refractures to form a complex fracture network. This study provides a theoretical guidance and technology support for refracturing operations.

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Section: Experimental Device and Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on the mechanisms of refracturing technology featuring temporary plug for fracturing fluid diversion in tight sandstone reservoirs

Zhao

et al. 2018

Energy Science & Engineering

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“…Moreover, an indication of the initiation of a local fracture or secondary fracturing, which can significantly affect the production rate [49], may come from the known stress state along the fracture length. As the current paper goal is, however, the development of a computational approach, these interesting and important problems are beyond the scope of the current study.…”

Section: Analysis Of Stressesmentioning

confidence: 99%

Residual opening of hydraulic fractures filled with compressible proppant

Neto

Kotousov

2013

International Journal of Rock Mechanics and Mining Sciences

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“…However, for the formation of special T-type fractures in coal fracturing processes, previous research results are not applicable any more, and a new theoretical model needs to be established to calculate and describe the formation of T-type fractures. At present, in the research on the coalbed fracturing model, scholars have tried to use the finite element method [20][21][22], to simulate the initiation and propagation of hydraulic fractures with different types of coal reservoirs in different blocks. However, this method is only aimed at specific reservoir types and parameters and is not universally applicable.…”

Section: Introductionmentioning

confidence: 99%

Model of T-Type Fracture in Coal Fracturing and Analysis of Influence Factors of Fracture Morphology

Jia

et al. 2018

Energies

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Special T-type fractures can be formed when coal is hydraulically fractured and there is currently no relevant theoretical model to calculate and describe them. This paper first establishes the height calculation model of vertical fractures in multi-layered formations and deduces the stress intensity factor (SIF) at the upper and lower sides of the fracture in the process of vertical fracture extension. Combined with the fracture tip stress analysis method of fracture mechanics theory, the horizontal bedding is taken into account for tensile and shear failure, and the critical mechanical conditions for the formation of horizontal fracture in coal are obtained. Finally, the model of T-type fracture in coal fracturing is established, and it is verified by fracturing simulation experiments. The model calculation result shows that the increase of vertical fracture height facilitates the increase of horizontal fracture length. The fracture toughness of coal has a significant influence on the length of horizontal fracture and there is a threshold. When the fracture toughness is less than the threshold, the length of horizontal fracture remains unchanged, otherwise, the length of horizontal fracture increases rapidly with the increase of fracture toughness. When the shear strength of the interface between the coalbed and the interlayer increases, the length of the horizontal fracture of the T-type fracture rapidly decreases.

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Initiation of a secondary hydraulic fracture and its interaction with the primary fracture

Cited by 20 publications

References 20 publications

Study on the mechanisms of refracturing technology featuring temporary plug for fracturing fluid diversion in tight sandstone reservoirs

Study on the mechanisms of refracturing technology featuring temporary plug for fracturing fluid diversion in tight sandstone reservoirs

Residual opening of hydraulic fractures filled with compressible proppant

Model of T-Type Fracture in Coal Fracturing and Analysis of Influence Factors of Fracture Morphology

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