Automatic fracture optimization for shale gas reservoirs based on gradient descent method and reservoir simulation

Chen, Jiaheng; Wang, Lei; Yao, Bowen; Tian, Yan; Wu, Yu‐Shu

doi:10.46690/ager.2021.02.08

Cited by 22 publications

(7 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Three approaches are usually utilized to estimate the formation pore pressure in a region. The first employs the steady pressure at the end of stage completion during fracturing stimulation of horizontal wells to estimate the formation pore pressure 26 . The second utilizes field monitoring tests of reservoir pressure 9 .…”

Section: Methodsmentioning

confidence: 99%

Mitigating risks from hydraulic fracturing-induced seismicity in unconventional reservoirs: case study

Hui

Chen

Wang

et al. 2022

Sci Rep

View full text Add to dashboard Cite

The recent remarkable increase in induced seismicity in Western Canada has been largely attributed to hydraulic fracturing in unconventional reservoirs. The nucleation of large magnitude events has been demonstrated to be closely linked to site-specific geological and operational factors. A mitigation strategy of fracturing-induced seismicity concerning both factors has not been well investigated. In this paper, a comprehensive investigation of risk mitigations from induced seismicity is conducted based on the formation overpressure, distance to Precambrian basement, proximity to faults, fracturing job size and safe hydraulic fracture-fault distance. It is found that the middle-south region near Crooked Lake is an optimal region for fracturing operations with low formation pressure, a great distance to the basement and relatively fewer pre-existing faults. A field case study suggests that fracturing operations of three new horizontal wells are successful with low magnitude induced events and with high production performance, demonstrating the applicability of a comprehensive approach of seismicity risk mitigations. Such an approach can be applied to other field cases to mitigate the potential fracturing-induced seismicity in unconventional reservoirs.

show abstract

Section: Methodsmentioning

confidence: 99%

Mitigating risks from hydraulic fracturing-induced seismicity in unconventional reservoirs: case study

Hui

Chen

Wang

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…In the last decade, benefiting from the rapid development of horizontal well drilling and fracturing technology, shale gas extraction has achieved commercial exploitation. [ 9,10 ] During a hydraulic fracturing process, a large volume of fracturing fluid with high pressure is pumped into a reservoir to improve its permeability of formation by creating fractures ranging from several metres to hundreds of metres. [ 11,12 ] However, the fractures induced by hydraulic fracturing are not sufficient to characterize the entire shale gas production process because shale reservoirs demonstrate complex petrophysical properties.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive review on the flow behaviour in shale gas reservoirs: Multi‐scale, multi‐phase, and multi‐physics

Feng

Chen

et al. 2022

Can J Chem Eng

View full text Add to dashboard Cite

An accurate description of fluid flow is critical for the prediction of the productivity of shale gas reservoirs. In this paper, we present the current advances and a systematic summary on the fluid flow in shale gas reservoirs. First, shale pore structures, consisting of organic pores and inorganic pores ranging from nanoscale to micro-scale, and reservoir fluids, including free gas, absorbed gas, and water, are systematically presented. Thereafter, multi-physics flow phenomena motivated by scale effects, such as continuum flow, slip flow, transition flow, free molecular flow, and surface diffusion for gas, as well as the effective viscosity and slip boundary condition for water, are carefully summarized. Meanwhile, these flow mechanisms are discussed with molecular dynamics (MD) simulations and theoretical analysis. Subsequently, on the basis of upscaling approaches, including capillary bundle models, the lattice Boltzmann method (LBM), and pore network models (PNMs), fluid flow through heterogeneous shale matrix is reviewed and the influences of scale effects and pore structures are clarified. Additionally, shale gas well performance is discussed by combining the multiple transport mechanisms and a fracturing-shut-in-flowback-production process. Our review concluded that the fluid flow behaviour in shale gas reservoirs is a complex multi-scale process accompanied by multi-physical phenomena and multi-fluid distributions. Keeping this in mind is helpful for predicting the shale gas production and recoverable gas resources. We expect this study can not only help by providing a better understanding of the fluid flow in shale reservoirs but also provide significant implications to address other multiphase flow processes.

show abstract

“…Generally, the evaluation indicators of shale fracturability mainly include: brittle mineral content (Mullen and Enderlin, 2012), Young's modulus and Poisson's ratio (Rickman et al, 2008), brittleness (Guo et al, 2015), and in-situ stress difference coefficient (Xiao et al, 2022). In recent years, more and more scholars have established a coupled multi-parameter comprehensive characterization model of shale fracturability by considering multiple geomechanical factors (Huang et al, 2019;Chen et al, 2021;Dou et al, 2021;Xiao et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of fracturability of shale reservoirs in the longmaxi formation in southern sichuan basin

et al. 2022

View full text Add to dashboard Cite

Major breakthroughs have been made in the exploration and development of shale gas in the Longmaxi Formation in the southern Sichuan Basin, China. The previous have adopted various methods to study the fracturability of shale, but the quantitative characterization of the comprehensive properties of shale during hydraulic fracturing is still difficult. For this reason, in this study, taking the Longmaxi Formation shale in the Changning and Luzhou Blocks in the southern Sichuan Basin as an example, the mineral composition, petrophysical properties, rock mechanical properties and in-situ stress of the shale were systematically studied using X-ray diffraction, pulsed porosity-permeability analysis, rock mechanics and in-situ stress tests. Furthermore, the brittle mineral content, elastic modulus, and in -situ stress parameters were calculated, and the Analytic Hierarchy Process (AHP) method was adopted to establish a comprehensive evaluation index of shale fracturability. The research results show that the shale of the Longmaxi Formation in southern Sichuan is dominated by mixed shale facies, and it has the characteristics of high content of brittle minerals, low porosity, large compressive strength and Young’s modulus, and small value of in-situ stress difference coefficient. Therefore, the Longmaxi Formation shale has good fracturing conditions. TOC and quartz contents have important effects on the fracturability of the Longmaxi shale. The analytic hierarchy process was adopted to determine the weight coefficients of the modulus brittleness index, mechanical brittleness index, in-situ stress difference coefficient, rock compressive strength and TOC content. Furthermore, a comprehensive evaluation index of fracturability was constructed. Calculations show that the comprehensive fracability indices of shale in the Changning and Luzhou Blocks are 0.49 and 0.59, respectively. Moreover, the quality of shale in the Luzhou Block is better than that in the Changning Block, which is related to the organic matter and quartz content and the microscopic pore structures inside the shale.

show abstract

Automatic fracture optimization for shale gas reservoirs based on gradient descent method and reservoir simulation

Cited by 22 publications

References 17 publications

Mitigating risks from hydraulic fracturing-induced seismicity in unconventional reservoirs: case study

Mitigating risks from hydraulic fracturing-induced seismicity in unconventional reservoirs: case study

A comprehensive review on the flow behaviour in shale gas reservoirs: Multi‐scale, multi‐phase, and multi‐physics

Evaluation of fracturability of shale reservoirs in the longmaxi formation in southern sichuan basin

Contact Info

Product

Resources

About