Integrated Workflow of Geomechanics, Hydraulic Fracturing, and Reservoir Simulation for Production Estimation of a Shale Gas Reservoir

Lee, Taeyeob; Jeong, Daein; So, Youngseok; Park, Daejin; Baek, Munseok; Choe, Jonggeun

doi:10.1155/2021/8856070

Cited by 2 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…And the increase in illite content and micropore volume is the same [15]. The research results of rock mechanics show that fracturing fluid causes shale hydration and rock strength reduction, and the proppant is more likely to be embedded, resulting in a decrease in conductivity of artificial fracture [16]. Zolfaghari et al's research shows that the higher the clay content, the greater the cation exchange capacity, which will lead to an increase in the imbibition amount of the fracturing fluid.…”

Section: Introductionmentioning

confidence: 95%

The Effect of Slickwater on Shale Properties and Main Influencing Factors in Hydraulic Fracturing

Liu,

Yang,

Zhao

et al. 2023

Geofluids

View full text Add to dashboard Cite

As shale gas reservoirs have low porosity and low permeability, hydraulic fracturing is a necessary means for industrial exploitation of shale gas. In this study, aiming at the problem of reservoir damage in the process of hydraulic fracturing of shale gas reservoir, a physical simulation method of slickwater fracturing fluid flow in shale core has been established. The change laws of physical parameters of the shale were quantified after slickwater fracturing fluid filtrating into it. The main factors affecting physical parameters of shale matrix around fractures were found out in the process of fracturing, shut-in, and flowback of slickwater fracturing fluid. The results show that after treated by slickwater fracturing fluid, the wettability of shale becomes more uniform in distribution (the water contact angles from 43° to 48°). In the fracturing filtration zone, the damage rate of fracturing fluid to shale porosity is 6.4%-42.0%. Low differential pressure flowback can reduce the damage of the shale, and prolonging the time of shut-in has no obvious effect on the damage to porosity. After 0.3 d (imbibition stability time), the damage of fracturing fluid to shale permeability is basically stable (55.9%). Permeability damage is mainly caused by residue of the fracturing fluid in large pores and bound water in small pores. Analysis of weights of all fracturing parameters shows that flowback differential pressure has the largest influence weight on shale porosity (51.4%), and well shut-in time has the largest influence weight on shale permeability (62.7%). Therefore, in the production process, it is suggested to properly reduce the backflow differential pressure and moderately shorten the well shut-in time.

show abstract

Section: Introductionmentioning

confidence: 95%

The Effect of Slickwater on Shale Properties and Main Influencing Factors in Hydraulic Fracturing

Liu,

Yang,

Zhao

et al. 2023

Geofluids

View full text Add to dashboard Cite

show abstract

“…In general, the larger the Young's Modulus and the smaller the Poisson's ratio, the more impactful the fracturing operation will be, and a larger volume of rock near the fracture will be stimulated. This volume is called the stimulated reservoir volume (SRV) [31][32][33].…”

Section: Estimation Of the Brittleness Indexmentioning

confidence: 99%

Applications of Differential Effective Medium (DEM)-Driven Correlations to Estimate Elastic Properties of Jafurah Tuwaiq Mountain Formation (TMF)

Shawaf,

Rasouli,

Dehdouh

2023

Processes

View full text Add to dashboard Cite

Organic-rich mud rocks are being developed on a large scale worldwide, including in the Middle East. The Jurassic Tuwaiq Mountain Formation (TMF) in the Jafurah Basin is a potential world-class unconventional play. Based on a petrophysical evaluation of the Jafurah basin, the TMF exhibits exceptional and unconventional gas characteristics, such as a high total organic content (TOC) and low clay content. Additionally, the TMF is in the appropriate maturity window, indicating that it has reached the required level of thermal maturity to generate hydrocarbons. Plans for the development of the Jafurah unconventional field use multistage hydraulic fracturing technology. The elastic properties of the shale formation, particularly its Young’s modulus and Poisson’s ratio, dictate how the rock responds to stress and deformation. These properties strongly impact the growth of hydraulic fractures in shale formations. Without a comprehensive understanding of the elastic properties, predicting the bulk mechanical response of the target zones and surrounding layers would be challenging. Therefore, this study aims to predict the elastic characteristics of the Jafurah shale play considering the variations in carbonate facies, the kerogen volume fraction, and the pore’s geometry. Petrophysical and XRD data were used to estimate the elastic properties of various tiers (geological units) of the TMF (Tiers 1, 2, and 3). Inclusion-based, differential effective medium (DEM) rock physics models were used to estimate the formation’s elastic and velocity properties as a function of the kerogen volume fraction and the pore’s geometry. The results showed that the Young’s modulus as well as the mineral and elastic brittleness indices increase as the volume fraction of calcite increases. At the same time, they decrease due to intensified clay and kerogen volumes. The effect of the TMF’s elastic parameters on the rock brittleness behavior was also investigated by considering the formation’s mineralogy, as well as clay and kerogen contents. The results led to the development of physics-based correlations of the mineral brittleness index as function of the Young’s modulus and Poisson’s ratio for various tiers of the TMF.

show abstract

Integrated Workflow of Geomechanics, Hydraulic Fracturing, and Reservoir Simulation for Production Estimation of a Shale Gas Reservoir

Cited by 2 publications

References 16 publications

The Effect of Slickwater on Shale Properties and Main Influencing Factors in Hydraulic Fracturing

The Effect of Slickwater on Shale Properties and Main Influencing Factors in Hydraulic Fracturing

Applications of Differential Effective Medium (DEM)-Driven Correlations to Estimate Elastic Properties of Jafurah Tuwaiq Mountain Formation (TMF)

Contact Info

Product

Resources

About