A DEM–CFD coupling method for modelling two-hole synchronous hydraulic fracturing

Abstract

This work introduced a novel numerical approach for modelling hydraulic fracturing processes. The Edinburgh bonded particle model was employed to establish the discrete element model of the rock samples, and it was further coupled with computational fluid dynamics to simulate the hydraulic fracturing. The fracture propagation law was taken into account under various principal stress differences to confirm the viability of the model. In addition, the model was used to investigate the fracture propagation mechanism of two-hole synchronous hydraulic fracturing. The results indicate that the arrangement and spacing of two holes will affect the complexity of hydraulic fractures. The principal stress difference becomes more prominent in the direction of hydraulic fracture propagation with the increase in the principal stress difference.

Assessment of Technology Implementation in the Process of Designing and Finishing Wells of the Precaspian Region Field

“…Для такого рода динамических расчетов с высоким разрешением сетки грида, тем более неструктурированного, значительным изменением объемов и свойства рядом расположенных ячеек необходимо использовать мощные инструменты и программные продукты такие как INTERSECT (IX). Осуществимость модели гидравлического разрыва пласта проверяется путем рассмотрения закона распространения трещины при различных разностях основных напряжений [14]. Рекомендуется уделить особое внимание проверке конфигурации модели с трещиной, подбору количества зон, которые используются при апскелинге, провести предварительную серию расчетов для получения максимальной стабильности.…”

Study on deep learning methods for coal burst risk prediction based on mining-induced seismicity quantification

“…Model performance evaluation is key to predictive models (Yang et al 2023). In binary classification model evaluation, several commonly used statistical parameters are precision (P), recall (R), and accuracy(ACC ).…”

Investigation and Application of Perforation Optimization Method on Shale Gas Horizontal Well with Numerical Simulation of Multicluster Fracturing under Dense-Segment Pattern

“…Hydraulic fracturing has been regarded as a major technique helping stimulate the oil and gas reservoirs. − During a hydraulic fracturing process, sand-carrying fluid is pumped into the well bore to propagate induced fractures in the formation. − Multistage fracturing and horizontal drilling are the major techniques applied in the stimulation of unconventional reservoirs such as tight sand and shale, which are hard to develop with economic benefits by normal ways due to the ultralow permeability and low porosity. − The engineering pattern of stage-by-stage simultaneous fracturing with multiple perforation clusters has been seen as a critical stimulation method and has been proven functioning better than that with one cluster per stage in enhancing the flow abilities of oil and gas in unconventional reservoirs. , However, there is evidence indicating an attendant problem that the profile of the inflow rates of multiple perforation clusters turns out to be nonuniform due to the poor fracture propagation uniformity, which causes the low utilization ratio of perforations and massively blocks the production potential of one fractured horizontal well. − Miller et al’s study indicates that only about 20% of the clusters contribute to the 80% of the total production by acquiring and interpreting the production logs from more than 100 horizontal shale wells in multiple basins. Coincidentally, Cipolla et al drew a similar conclusion with that above by reviewing production logs for over 100 horizontal shale-gas wells, in which less than 30% of the perforation clusters produces the most of the gas and 40% or more of the clusters are nonproductive.…”