Effects of elastic anisotropy on primary petroleum migration through buoyancy-driven crack propagation

Jin, Z.-H.; Johnson, Scott E.

doi:10.1007/s40948-017-0062-6

Cited by 6 publications

(4 citation statements)

References 30 publications

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“…In the physical simulation of water invasion in gas reservoirs, previous studies only considered the elastic expansion of formation water when simulating the edge-and-bottom aquifer [20,21]. However, the compressibility of formation water is between 3.4 × 10 −4 and 5.0 × 10 −4 MPa −1 in gas reservoirs with the finite edge-and-bottom aquifer [22]. Thus, the elastic expansion capacity of an aquifer is very weak and the aquifer expansion caused by the formation pressure drop is small.…”

Section: Experimental Systemsmentioning

confidence: 99%

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Experimental Study on the Physical Simulation of Water Invasion in Carbonate Gas Reservoirs

et al. 2017

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Water invasion in carbonate gas reservoirs often results in excessive water production, which limits the economic life of gas wells. This is influenced by reservoir properties and production parameters, such as aquifer, fracture, permeability and production rate. In this study, seven full diameter core samples with dissolved pores and fractures were designed and an experimental system of water invasion in gas reservoirs with edge and bottom aquifers was established to simulate the process of water invasion. Then the effects of the related reservoir properties and production parameters were investigated. The results show that the edge and bottom aquifers supply the energy for gas reservoirs with dissolved pores, which delays the decline of bottom-hole pressure. The high water aquifer defers the decline of water invasion in the early stage while the big gas production rate accelerates water influx in gas reservoirs. The existence of fractures increases the discharge area of gas reservoirs and the small water influx can result in a substantial decline in recovery factor. With the increase of permeability, gas production rate has less influence on recovery factor. These results can provide insights into a better understanding of water invasion and the effects of reservoir properties and production parameters so as to optimize the production in carbonate gas reservoirs.

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Section: Experimental Systemsmentioning

confidence: 99%

“…Water supplies an extra mechanism to produce gas reservoirs, and it is important to understand the effects of water energies [22,23]. The core 4 is chosen to study the effects of different water invasion energies.…”

Section: Effect Of Different Water Invasion Energiesmentioning

confidence: 99%

Experimental Study on the Physical Simulation of Water Invasion in Carbonate Gas Reservoirs

et al. 2017

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“…Knowledge of the mechanical properties of the reservoir rock formations, especially the rock brittleness, is vital in designing successful field HF operations [6,7]. The rock brittleness and rupture properties are closely related, i.e., a rock formation generally fractures easily and sharply when brittle, or previously existing fractures reopen more easily via fluid injection during the HF operation.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Hydraulic Tensile Strength Correlation with Strength-Based Brittleness Indices for Carbonate Reservoirs

Ezazi,

Ghorbani,

Shafiei

et al. 2024

Geosciences

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Hydraulic fracturing (HF) is the primary choice for stimulating petroleum reservoirs. Rock tensile strength and brittleness are crucial parameters required for screening candidate reservoirs and in designing successful HF operations. However, in situ and laboratory determinations of the hydraulic tensile strength (HTS) of rock can prove problematic. Alternatively, the HTS could be estimated from the rock brittleness once a reliable relationship has been established between them. Accordingly, this paper investigates the correlations between the HTS, as measured using laboratory hydraulic fracture tests, and ten strength-based brittleness indices (BIs) selected from the research literature. The primary inputs for computing these BIs are uniaxial compressive strength (UCS) and the Brazilian tensile strength (BTS), which are typically measured for most projects using standard laboratory rock mechanics tests or obtained from log data. For the purposes of this experimental investigation, intact rock core samples were obtained from a carbonate–dolomite formation in Iran, comprising eight distinct geomechanical units, with measured values of UCS, BTS, and HTS ranging 29.7–162.2, 1.93–12.23, and 7.20–20.63 MPa, respectively. The measured HTS was found to directly correlate with the UCS, BTS, and Young’s modulus, and inversely correlated with the rock porosity. Seven of the ten investigated BIs correlated with the measured HTS over 69% (R2 ≥ 0.69). In particular, the BI expressions developed by Yagiz and Gokceoglu, Ghadernejad et al., and Khandelwal et al. exhibited relatively strong correlations with the measured HTS (producing R2 values of 0.94, 0.87, and 0.86, respectively), suggesting that these three HTS–BI correlations could be used to provide preliminary HTS estimates for the investigated carbonate–dolomite formation in Iran. This work adds to a database that can be expanded to include other geographical regions for providing useful information about the selection of a suitable site or reserve for conducting HF operations.

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“…Meanwhile, borehole instability is an important problem restricting shale gas drilling [8][9][10]. Shale gas reservoirs generally have high strength and strong brittleness [11][12][13][14][15] and are a typical hard brittle shale. Borehole instability in such formations has not been effectively solved all the time [16][17][18], the borehole may still collapse with increasing borehole drilling time even though the pressure of the drilling fluid column is higher than the collapse pressure and the stress around the borehole is lower than the peak strength [16,19].…”

Section: Introductionmentioning

confidence: 99%

Permeability Change Caused by Stress Damage of Gas Shale

et al. 2017

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Stress damage of shale during the uniaxial loading process will cause the change of permeability. The study of stress sensitivity of shale has focused on the influence of confining pressure on shale permeability and the change of shale permeability during the loading process of axial stress is lacking. The permeability of gas shale during loading process was tested. The results show that shale damage macroscopically reflects the process of axial micro-cracks generation and expansion, and the axial micro-cracks will cause permeability change during the loading process. There is a good corresponding relationship between damage development and micro-crack expansion during the process of shale loading. The damage factor will increase in the linear elastic stage and enlarge rapidly after entering the stage of unstable micro-crack expansion, and the permeability of shale increases with the increasing of shale damage. The research results provide a reliable test basis for further analysis of the borehole instability and hydraulic fracture mechanisms in shale gas reservoirs.

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Effects of elastic anisotropy on primary petroleum migration through buoyancy-driven crack propagation

Cited by 6 publications

References 30 publications

Experimental Study on the Physical Simulation of Water Invasion in Carbonate Gas Reservoirs

Experimental Study on the Physical Simulation of Water Invasion in Carbonate Gas Reservoirs

Laboratory Hydraulic Tensile Strength Correlation with Strength-Based Brittleness Indices for Carbonate Reservoirs

Permeability Change Caused by Stress Damage of Gas Shale

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