Estimate of in-situ stress and geomechanical parameters for Duvernay Formation based on borehole deformation data

Han, Hongxue; Yin, Shunde; Chen, Zhuoheng; Dusseault, Maurice B.

doi:10.1016/j.petrol.2020.107994

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…Equation 4 is the general equation of the ellipse, indicating that circular boreholes in anisotropic reservoirs will deform into elliptical boreholes under the effect of the in situ stress. This observation aligns with the logging data (Zoback et al, 2003;Han et al, 2021), indicating that the proposed model is consistent with the actual situation.…”

Section: Determination Of Shape After Circular Borehole Deformationsupporting

confidence: 88%

“…The analysis of logged data suggests that in layered reservoirs, circular boreholes can be transformed into elliptical boreholes under in situ stress (Zoback et al, 2003;Pierdominici et al, 2020;Han et al, 2021). Various researchers have created models to forecast the extent of borehole deformation (Zou et al, 2018;Fang et al, 2022;Han et al, 2023), but these models do not account for the impact of elastic anisotropy in layered reservoirs, which could affect the accuracy of the forecasts (Ma et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…However, these models are specifically designed for the circular borehole. Field logging data shows that circular boreholes can deform due to stress and mechanical anisotropy (Figure 1) (Zoback et al, 2003;Pierdominici et al, 2020;Han et al, 2021). Various studies have investigated the effects of borehole deformation.…”

Section: Introductionmentioning

confidence: 99%

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Fracture initiation pressure prediction of hydraulic fracturing for layered reservoirs considering borehole deformation

Wang,

Niu

et al. 2024

Front. Earth Sci.

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Accurately predicting fracture initiation pressure is crucial for successfully applying hydraulic fracturing technology in layered reservoirs. However, existing models overlook the effects of rock anisotropy and borehole deformation. In this study, we simplified the layered reservoir to a transversely isotropic medium and developed a model to estimate borehole deformation precisely. Based on this estimated deformation, we created a model to predict fracture initiation pressure in hydraulic fracturing. By comparing previous models and experimental data, we validated the effectiveness of these proposed models. We examined the impacts of various factors on borehole deformation, fracture initiation pressure, and initiation angle. The results revealed that circular boreholes in layered reservoirs deform into elliptical boreholes under in situ stress, with the major axis not aligning with the principal stress direction, which highlights the significant impact of rock anisotropy on borehole deformation. Furthermore, the fracture initiation pressure of hydraulic fracturing either increases or decreases following borehole deformation, depending on specific geological parameters. The calculated initiation angle after borehole deformation is within 10°, closer to previous experimental results, underscoring the notable effect of borehole deformation on hydraulic fracturing. Our research indicates that the impact of borehole deformation on hydraulic fracturing is significant and should not be overlooked. This finding will offer fresh avenues for further study in the field of hydraulic fracturing.

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Section: Determination Of Shape After Circular Borehole Deformationsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

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Fracture initiation pressure prediction of hydraulic fracturing for layered reservoirs considering borehole deformation

Wang,

Niu

et al. 2024

Front. Earth Sci.

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“…The stress state of the pipeline should also be considered, as even a pipeline with low wear can still rupture under a large load. This article draws on research results from petroleum pipelines [20], tunnels, and other engineering projects [21][22][23][24]. It combines the basic principles of elastic mechanics and material mechanics to reveal their failure mechanisms from a mechanical perspective.…”

Section: Introductionmentioning

confidence: 99%

New Model and Finite Element Analysis of the Anti-Extrusion Strength of Backfill Drilling Pipelines

Li,

Wang,

Liu

2024

Minerals

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Currently, in some domestic and foreign mines, the backfill drilling pipeline experiences a rupture phenomenon even when the wear degree is low. This results in a delay in production due to the filling becoming ‘sick’. This paper presents, for the first time, the damage mechanism from a mechanical perspective and re-derives the anti-extrusion strength model of the backfill drilling pipeline. We investigate the influence of the law on the anti-extrusion strength of pipelines from the perspective of strata and cement rings. We then verify the theoretical and simulation results through engineering examples. The results demonstrate that the Mises stress criterion is a suitable modification principle for the anti-extrusion strength model of the backfill drilling pipeline. The anti-extrusion strength of the pipeline is related to the elastic modulus and Poisson’s ratio of the stratum, and the thickness of the cement ring. It is negatively affected by the depth of the stratum. For hard strata, a cement ring with a smaller elastic modulus is suitable, while for soft stratum, a cement ring with a larger elastic modulus is recommended. When the missing angle of the cement ring is less than 60°, the stress concentration factor increases up to 2.2. The stress unloading capacity of the cement ring ranges from 32.7% to 37.8%, and optimal performance of the cement ring is achieved when it has high strength and low rigidity. The backfill filling pipeline of a copper mine abroad was destroyed due to external extrusion force exceeding its anti-extrusion strength value. The modified pipeline anti-extrusion strength model is 18.2% higher than the pipeline API strength value. This finding can inform the design of the backfill filling pipeline for China’s kilometer-deep wells in the future.

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“…Therefore, understanding the magnitude of the in situ stress in the tunnel area is a necessary condition for the design of the tunnel surrounding rock support scheme and the safe construction of the deep tunnel (Li et al, 2022;Qin, 2018). At present, there are generally three types of in situ stress testing methods: one is to measure in situ stress by means of injection, such as hydraulic fracturing tests (Desroches & Kurkjian, 1999;Haimson & Fairhurst, 1967), extended leak-off tests, casing shoe leak-off tests and formation integrity tests (Zoback, 2007); second is strainrelief-based methods, such as over-coring and differential strain analysis (Fischer, 1982); the third type is based on sonic (acoustic) logging (Close et al, 2009), the empirical correlation-calculation of estimated rock mechanical properties (Chang et al, 2006) and in situ stress (Han et al, 2021;Najibi et al, 2017;Sinha et al, 2008). In the in situ stress measurement of underground engineering sites, hydraulic fracturing and over-coring are the most widely used.…”

Section: Introductionmentioning

confidence: 99%

Research on in situ stress inversion of deep‐buried tunnel based on pressure/tension axis mechanism and geological structure

Chen

Liu

Song

2023

Deep Underground Science and Engineering

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The investigation of the in situ stress distribution has always been a key condition for engineering design of deep tunnels and analysis of surrounding rock stability. In this paper, a comprehensive judgment method coupled with pressure/tension (P/T) axis mechanism and geological structure is proposed to invert the in situ stress in the Duoxiongla tunnel in Tibet. In the process of TBM tunnel excavation, 3887 groups of microseismic events were collected by means of microseismic monitoring technology. By studying the temporal and spatial distribution of 3887 groups of microseismic events, 42 groups of microseismic data were selected for in situ stress inversion. Then the focal mechanisms of 42 groups of microseisms were inverted. Combined with the analysis of the previous geological survey, the inversion results of the in situ stress were analyzed. According to the focal mechanism of the tunnel area, the linear in situ stress inversion method was used to invert the in situ stress in the source area. Finally, according to the PTGS (pressure/tension axis mechanism and geological structure) comprehensive judgment method proposed in this paper, the in situ stress of the tunnel microseismic region was determined. The results show that there are mainly three groups of fissures and joint surfaces in the tunnel area, and the in situ stress is dominated by the horizontal tectonic stress; the main driving force of the rupture surface in the excavation process of Duoxiongla tunnel is the horizontal tectonic stress; the distribution of the maximum and minimum principal stress obtained by the inversion is consistent with the distribution of the P/T axis; combined with the linear in situ stress inversion method and the comprehensive judgment of PTGS, the azimuth and dip angles of the three principal stresses are finally determined as N90.71°E, 4.06°, N5.35°W, 3.06°, and N8.10W, 85.32°, respectively. The study verifies the feasibility of microseismic inversion of in situ stress.

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Estimate of in-situ stress and geomechanical parameters for Duvernay Formation based on borehole deformation data

Cited by 8 publications

References 27 publications

Fracture initiation pressure prediction of hydraulic fracturing for layered reservoirs considering borehole deformation

Fracture initiation pressure prediction of hydraulic fracturing for layered reservoirs considering borehole deformation

New Model and Finite Element Analysis of the Anti-Extrusion Strength of Backfill Drilling Pipelines

Research on in situ stress inversion of deep‐buried tunnel based on pressure/tension axis mechanism and geological structure

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