A Comprehensive Well Look-Back; Analyzing Three Years’ Worth of Drilling, Completing and Producing Eagle Ford Wells in Order to Understand Trend-Wide Performance Drivers and Variability

Portis, Douglas H.; Bello, Hector; Murray, Mark W.; Suliman, Bailo; Barzola, Gervasio; Basu, Neil K.

doi:10.1190/urtec2013-018

Cited by 7 publications

(3 citation statements)

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“…Well look backs across Pioneer's acreage position have consistently shown that TOC is one of the key performance drivers in Pioneer's 'sweet spot' Eagle Ford acreage (Portis et al, 2013). TOC is an attribute that is consistently used to define Pioneer's lateral well target intervals and to high grade acreage in the Eagle Ford play.…”

Section: Toc Modelingmentioning

confidence: 99%

Expanding the Application of Chemostratigraphy within Cretaceous Mudrocks: Estimating Total Organic Carbon and Paleoredox Facies using Major, Minor and Trace Element Geochemistry

Tinnin

Hildred²,

Martinez³

2013

Unconventional Resources Technology Conference, Denver, Colorado, 12-14 August 2013

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Section: Toc Modelingmentioning

confidence: 99%

Expanding the Application of Chemostratigraphy within Cretaceous Mudrocks: Estimating Total Organic Carbon and Paleoredox Facies using Major, Minor and Trace Element Geochemistry

Tinnin

Hildred²,

Martinez³

2013

Unconventional Resources Technology Conference, Denver, Colorado, 12-14 August 2013

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“…A more efficient solution is required to group rock with similar production characteristics and mechanical properties into optimized stages for a more consistent and effective fracturing operation. Portis (2013) also analyzes production and petrophysical data from several wells drilled in the Eagle Ford shale and reports that it is critical to acquire data such as pilot logs, pressure-volume-temperature (PVT) data, etc. Therefore, an investigation of sensitivity and errors is of interest for optimized formation evaluation, fracture staging, and perforation cluster picking.…”

Section: Introductionmentioning

confidence: 99%

“…Empirical observations indicate that sensitivity to inaccurate measurements decreases with an increased number of well logs. Portis (2013) concludes that the following parameters are the important factors controlling the production (in decreasing order of importance): Cadwallader et al (2015), Sebastian et al (2015), and discuss considerations for successful implementation of geomechanics and completion optimization in the Eagle Ford shale.…”

Section: Introductionmentioning

confidence: 99%

Selecting optimum log measurements for hydraulic fracturing

2016

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We have developed a statistical method for investigating the importance of different log measurements for picking the best zones for hydraulic fracturing. We have determined the method's applicability using data from unconventional reservoirs (Eagle Ford, Haynesville, Barnett, and a reservoir from the Middle East). The analysis began with single log measurements (e.g., gamma ray [GR], compressional and shear sonic [DTC and DTS], and spectral gamma ray [SGR], which could measure the radioactivity of uranium [U], potassium [K], and thorium [Th]). Other types of measurements, including density (RhoB), neutron porosity (NPHI), and resistivity, were added to obtain more complex logging suites. These log measurements were the inputs for this analysis. Each input combination was referred to as a "scenario." Parameters such as effective porosity (PhiE), brittleness, total organic carbon (TOC), production index (PI), and fracture index (FI) were referred to as the outputs for the analysis. We have investigated linear and nonlinear combinations of the inputs to predict the outputs. Various scenarios, beginning with the simplest cases and ending with the most complete combination, were tested. The selection of log combinations was either based on the importance of individual logs or on industry-standard combinations (such as triple and quad combos). For each scenario, we computed correlation coefficients and root-mean-square errors of predicting the output parameters. The prediction accuracies generally increased as a result of increasing the number of input logs. Our analysis clearly found the importance of using SGR (for PI and FI prediction) and resistivity (for TOC prediction) logs. Based on comparison of the reconstruction results, actual values, and correlation coefficients/errors, we ranked the log combinations for predicting/modeling a specific parameter. The most challenging properties to model included TOC, PhiE, PI, and FI; the easiest properties to predict were brittleness and Young's modulus.

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Hydraulic Fracture Propagation in Layered Heterogeneous Rocks with Spatially Non-Gaussian Random Hydromechanical Features

Sarmadi,

Harrison,

Mousavi Nezhad

et al. 2024

Rock Mech Rock Eng

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This study proposes a stochastic method to analyse the propagation of hydraulic fractures affected by layered heterogeneity in rocks in a toughness-dominated regime. The study utilises the phase-field method in the context of two-dimensional finite element analysis to model the hydraulic fracture (HF) propagation in rock materials in laboratory scale. Field data on hydrogeologic properties of some rocks reveal that material heterogeneity may appear in the form of leptokurtic marginal distributions. Generalised sub-Gaussian (GSG) model is capable of capturing physical characteristics of such rocks, and it is employed to stochastically model rocks with layered lithologic heterogeneity by generating a large number of auto- and cross-correlated random fields for hydro-geomechanical properties. To investigate the sensitivity of the cracking response to the inherent characteristics of material heterogeneity, various GSG distribution forms are considered in Monte Carlo (MC) analyses. The HF’s deviation from the theoretically predicted direction, which is perpendicular to the direction of the minimum in situ stress, is correlated with the distribution of hydro-geomechanical properties, showing a Gaussian-type distribution. This study concludes that the differential stress and the bedding orientation are the main factors affecting the HF deviation and the required breakdown pressure for initiating the HF propagation from a borehole. In the application of directional hydraulic fracturing (DHF), the effect of bedding layers becomes dominant when the bedding orientation is aligned with the direction of perforations in the boreholes.

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A Comprehensive Well Look-Back; Analyzing Three Years’ Worth of Drilling, Completing and Producing Eagle Ford Wells in Order to Understand Trend-Wide Performance Drivers and Variability

Cited by 7 publications

References 0 publications

Expanding the Application of Chemostratigraphy within Cretaceous Mudrocks: Estimating Total Organic Carbon and Paleoredox Facies using Major, Minor and Trace Element Geochemistry

Expanding the Application of Chemostratigraphy within Cretaceous Mudrocks: Estimating Total Organic Carbon and Paleoredox Facies using Major, Minor and Trace Element Geochemistry

Selecting optimum log measurements for hydraulic fracturing

Hydraulic Fracture Propagation in Layered Heterogeneous Rocks with Spatially Non-Gaussian Random Hydromechanical Features

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