Imbibition inducing tensile fractures and its influence on in-situ stress analyses: A case study of shale gas drilling

Liu, Yang; Ge, Hongkui; Shen, Yinghao; Zhang, Junjing; Yan, Wei; Wu, Shunchuan; Tang, Xianglu

doi:10.1016/j.jngse.2015.07.028

Cited by 50 publications

(24 citation statements)

References 25 publications

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“…Roshan et al (2015) found that the formation of micro-fractures by crystalline swelling is much slower under confining pressure compared to when the shale sample is unconfined and allowed to swell freely. Yang et al (2015) studied the creation of micro-fractures induced by water imbibition in the laboratory using the shale samples from Longmaxi formation in China. They found that micro-fractures are concentrated in the organic-rich intervals that have lower grain density and high porosity.…”

Section: Fractures Micro-fractures and Matrixmentioning

confidence: 99%

A critical review of water uptake by shales

Singh

2016

Journal of Natural Gas Science and Engineering

240

146

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The shale boom in North America started more than a decade ago, however, the issue of substantial fracturing fluid loss inside shale did not draw much attention for a decade. In the past few years, many researchers conducted laboratory experiments to 1) observe various processes by which water imbibes into shale rocks, and 2) understand the mechanisms behind each process that contributes to fluid uptake in shale. Although there is consistency in most of the observations that control the liquid filling in shales, some issues remain in regards to wettability. Many mechanisms seem to be contributing to liquid filling in the laboratory experiments, but there is no consensus on the dominant mechanisms. Even though some observations from field provide consistent signatures, we do not yet have a verified answer for the geo-mechanisms behind those observations. This paper provides a critical review of the observations (laboratory and field), the mechanisms behind those observations, and the models to mimic the imbibition behavior of shales. In this regard, following contents are critically reviewed: 1) history of imbibition in shales, 2) laboratory observations, 3) field observations, 4) mechanisms of water imbibition in shales, and 5) simulation models. We also discuss evaporation of water in shale as an additional mechanism that has not been proposed before, but may be contributing to the loss of water in shale formations.

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Section: Fractures Micro-fractures and Matrixmentioning

confidence: 99%

A critical review of water uptake by shales

Singh

2016

Journal of Natural Gas Science and Engineering

240

146

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“…It is worth noting that the conductivity curves of some formations (e.g., GCG, UYC, and LYC) are not strictly linear which tend to have different curve behaviors (i.e., "inferior fovea", "upper convex" and "multi-stages"). Some of them are similar to the imbibition curves, whose behavior are mainly related to the pore size distribution and pore connectivity (Yang et al, 2015). The crushed shale samples of 100 mesh (diameter is less than 154 mm) is more of a reflection of matrix characteristics.…”

Section: The Characteristics Of Ions Transport Into Watermentioning

confidence: 68%

Quantitative investigation on the characteristics of ions transport into water in gas shale: Marine and continental shale as comparative study

Liu

Shi

et al. 2017

Journal of Natural Gas Science and Engineering

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“…Shale reservoir with bedding planes can be regarded as a transverse isotropy vertical formation, compared to the conventional isotropic model of the in situ stress, the transverse isotropy vertical model is more suitable for shale reservoir with horizontal bedding :

({, \begin{matrix} left σ_{H} = \frac{E_{h}}{E_{v}} \frac{ν_{v}}{1 - ν_{h}} (σ_{v} - δ P_{p}) + \frac{E_{h}}{1 - ν_{h}^{2}} ε_{H} + \frac{E_{h} ν_{h}}{1 - ν_{h}^{2}} ε_{h} + δ P_{p} \\ left σ_{h} = \frac{E_{h}}{E_{v}} \frac{ν_{v}}{1 - ν_{h}} (σ_{v} - δ P_{p}) + \frac{E_{h}}{1 - ν_{h}^{2}} ε_{h} + \frac{E_{h} ν_{h}}{1 - ν_{h}^{2}} ε_{H} + δ P_{p} \end{matrix})

where E v is the vertical Yang’s modulus; E h is the transverse Yang’s modulus; ν v is the vertical Poisson’s ratio; and ν h is the transverse Poisson’s ratio.…”

Section: In Situ Stress In Depleted Shale Gas Reservoirmentioning

confidence: 99%

“…Based on laboratory testing on gas shale samples in QY1 well in the Sichuan Basin of China by TerraTek, the dynamic properties are converted to static properties with a conversion factor of 0.78 .…”

Section: In Situ Stress In Depleted Shale Gas Reservoirmentioning

confidence: 99%

A novel evaluation on fracture pressure in depleted shale gas reservoir

Zhao

Yuan²,

Feng

et al. 2018

Energy Science & Engineering

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Fracture pressure is the key parameter both for horizontal drilling and hydraulic fracturing in the shale gas reservoir. Reservoir depletion will push for the change of the fracture pressure. Previous studies showed that fracture pressure will be decreased with reservoir depletion, which is not suitable for the anisotropic shale gas reservoir. Aiming at resolving this problem, a novel evaluation was established, which can be used to evaluate the influence on fracture pressure of the reservoir depletion, the anisotropy, and the well inclination. The results showed that the fracture pressure will be increased for the strongly anisotropic reservoir with reservoir depletion, and the fracture pressure has a tiny difference between the various anisotropic reservoirs before reservoir depleted, but a larger difference will appear after reservoir depleted, at the later depletion period, the fracture pressure is higher for the stronger anisotropic one. When the anisotropy and the depletion are both the same, the fracture pressure for the higher deviated well is lower. The method and the results can provide a theoretical basis both for the drilling and hydraulic fracturing in depleted shale gas reservoir.

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Imbibition inducing tensile fractures and its influence on in-situ stress analyses: A case study of shale gas drilling

Cited by 50 publications

References 25 publications

A critical review of water uptake by shales

A critical review of water uptake by shales

Quantitative investigation on the characteristics of ions transport into water in gas shale: Marine and continental shale as comparative study

A novel evaluation on fracture pressure in depleted shale gas reservoir

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