Influence of non-intersecting cemented natural fractures on hydraulic fracture propagation behavior

Wang, Haiyang; Yang, ShuGang; Zhou, Desheng; Wang, Qingqing

doi:10.1016/j.jsg.2024.105111

Cited by 2 publications

(4 citation statements)

References 50 publications

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“…(4) The heated rock was taken ou placed in the fracturing fluid or drilling fluid heated in a water bath for soaking. (5) The samples soaked for a certain period of time were taken out, and triaxial compression e iments were conducted.…”

Section: Rock Immersion Experimental Proceduresmentioning

confidence: 99%

“…(4) The heated rock was taken out and placed in the fracturing fluid or drilling fluid heated in a water bath for soaking. (5) The rock samples soaked for a certain period of time were taken out, and triaxial compression experiments were conducted. Figure 15 illustrates the variation curve of compressive strength in coal seam rock over time under immersion in different drilling fluid systems.…”

Section: Rock Immersion Experimental Proceduresmentioning

confidence: 99%

“…8 coalbed in the Ordos Basin, with daily natural gas production exceeding 100,000 cubic meters. However, due to the considerable burial depth of deep coalbed methane reservoirs, strong rock heterogeneity, and complex mechanical properties, drilling and hydraulic fracturing operations face significant challenges [4][5][6]. Addressing these challenges is essential for the efficient and safe development of unconventional deep coalbed methane resources in the future.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Analysis of the Mechanical Properties and Failure Behavior of Deep Coalbed Methane Reservoir Rocks

Wang,

Yang,

Zhang

et al. 2024

Processes

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A comprehensive understanding of the mechanical characteristics of deep coalbed methane reservoir rocks (DCMRR) is crucial for the safe and efficient development of deep coalbed gas resources. In this study, the microstructural and mechanical features of the coal seam roof, floor, and the coal seam itself were analyzed through laboratory experiments. The impact mechanisms of drilling fluid and fracturing fluid hydration on the mechanical properties and failure behavior of coal seam rocks were investigated. The experimental results indicate that the main minerals in coal seams are clay and amorphous substances, with kaolinite being the predominant clay mineral component in coal seam rocks. The rock of the coal seam roof and floor exhibits strong elasticity and high compressive strength, while the rock in the coal seam section shows a lower compressive capacity with pronounced plastic deformation characteristics. The content of kaolinite shows a good correlation with the mechanical properties of DCMRR. As the kaolinite content increases, the strength of DCMRR gradually decreases, and deformability enhances. After immersion in drilling fluid and slickwater, the strength of coal seam rocks significantly decreases, leading to shear fracture zones and localized strong damage features after rock compression failure. The analysis of the mechanical properties of DCMRR suggests that the horizontal well trajectory should be close to the coal seam roof, and strong sealing agents should be added to drilling fluid to reduce the risk of wellbore collapse. Enhancing the hydration of slickwater is beneficial for the formation of a more complex fracture network in deep coalbed methane reservoir.

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Section: Rock Immersion Experimental Proceduresmentioning

confidence: 99%

Section: Rock Immersion Experimental Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Analysis of the Mechanical Properties and Failure Behavior of Deep Coalbed Methane Reservoir Rocks

Wang,

Yang,

Zhang

et al. 2024

Processes

Self Cite

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“…Researchers have explored the effects of various fracturing parameters (such as fracturing fluid type, injection rate, fracturing pressure, etc.) on fracturing outcomes through experiments and numerical simulations to optimize fracturing construction schemes and enhance oil and gas production capacity [10][11][12][13][14]. Some studies have focused on the distribution of fluids in the reservoir and their influence on the formation of hydraulic fracture networks.…”

Section: Introductionmentioning

confidence: 99%

Study on the Interaction Propagation Mechanism of Inter-Cluster Fractures under Different Fracturing Sequences

Cai,

Zhao,

et al. 2024

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Horizontal-well multi-cluster fracturing is one of the most important techniques for increasing the recovery rate in unconventional oil and gas reservoir development. However, under the influence of complex induced stress fields, the mechanism of interaction and propagation of fractures within each segment remains unclear. In this study, based on rock fracture criteria, combined with the boundary element displacement discontinuity method, a two-dimensional numerical simulation model of hydraulic fracturing crack propagation in a planar plane was established. Using this model, the interaction and propagation process of inter-cluster fractures under different fracturing sequences within horizontal well segments and the mechanism of induced stress field effects were analyzed. The influence mechanism of cluster spacing, fracture design length, and fracture internal pressure on the propagation morphology of inter-cluster fractures was also investigated. The research results indicate that, when using the alternating fracturing method, it is advisable to appropriately increase the cluster spacing to weaken the inhibitory effect of induced stress around the fractures created by prior fracturing on subsequent fracturing. Compared to the alternating fracturing method, the propagation morphology of fractures under the symmetrical fracturing method is more complex. At smaller cluster spacing, fractures created by prior fracturing are more susceptible to being captured by fractures from subsequent fracturing. The findings of this study provide reliable theoretical support for the optimization design of fracturing sequences and fracturing processes in horizontal well segments.

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Influence of non-intersecting cemented natural fractures on hydraulic fracture propagation behavior

Cited by 2 publications

References 50 publications

Experimental Analysis of the Mechanical Properties and Failure Behavior of Deep Coalbed Methane Reservoir Rocks

Experimental Analysis of the Mechanical Properties and Failure Behavior of Deep Coalbed Methane Reservoir Rocks

Study on the Interaction Propagation Mechanism of Inter-Cluster Fractures under Different Fracturing Sequences

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