Optimizing Shale Economics with an Integrated Hydraulic Fracturing and Reservoir Simulator and a Bayesian Automated History Matching and Optimization Algorithm

This study describes an automated history matching and optimization workflow using an integrated hydraulic fracturing reservoir simulator and applies the workflow in four cases. The automated workflow solves a formal mathematical optimization problem to minimize misfit with observations from any point in the lifecycle of a hydraulically fractured well, or to maximize a quantity of interest, such as net present value.

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Optimization and Design of Next-Generation Geothermal Systems Created by Multistage Hydraulic Fracturing

Multistage hydraulic stimulation has the potential to greatly expand the production of geothermal in the United States and worldwide. Zonal isolation and limited-entry completion overcome the problem of flow localization and generate hundreds or thousands of conductive fractures throughout a large volume of rock. In contrast, conventional geothermal stimulation designs are bullheaded as a single stage into a vertical or deviated wellbore, resulting in a small number of dominant flow-pathways.

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Modeling Frac Hits: Mechanisms for Damage Versus Uplift

Parent/child interactions pose a critical challenge for oil and gas shale producers. The industry has progressed significantly in its understanding of causes and mitigation. However, important uncertainties remain. Fracture-driven interactions or more commonly, “frac hits”, exhibit varied behaviors in different basins.

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The Impact of Extended-Time Proppant Conductivity Impairment on the Ultimate Recovery from Unconventional Horizontal Well Completions

The stimulation design of hydraulically fractured wells has always pitted the engineer’s capability to maximize the fracture extent (or fracture half-length within the formation) versus the conductivity of the fracture pack generated by the deposited proppant material. In essence, the area of productive reservoir rock contacted by the hydraulic fracture treatment needs to be appropriately engineered to remain connected to the wellbore over the life of the well to maximize reservoir recovery.

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Modelling of Parent Child Well Interactions

We performed a modeling study calibrating a coupled “true” hydraulic fracturing and reservoir simulator to a complex set of observations from a parent-child well pad in the STACK play located in the Anadarko Basin area of Oklahoma. The model was constrained by sealed wellbore pressure monitoring, interference testing, pressure responses during frac hits, production data, and responses to chemical treatment.

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Best Practices in DFIT Interpretation: Comparative Analysis of 62 DFITs from Nine Different Shale Plays

In URTeC-123-2019, a group of operators and service companies presented a step-by-step procedure for interpretation of diagnostic fracture injection tests (DFITs). The procedure has now been applied on a wide variety of data across North and South America. This paper statistically summarizes results from 62 of these DFITs, contributed by ten operators spanning nine different shale plays.

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A Feasibility Study on Three Geothermal Designs: Deep Closed-Loop (with and without Conductive Fractures) and Open-Loop Circulation Between Multifractured Laterals

We performed a modeling study to compare the feasibility of three geothermal designs: a closed- loop heat exchanger, a closed-loop heat exchanger with hydraulic fractures engineered to contain thermally conductive material, and an open-loop two-well doublet with multistage fracturing along horizontal laterals. The study was performed with a fully integrated hydraulic fracturing, reservoir, and wellbore simulator. Simulations were performed at a variety of temperatures and operating conditions. The findings show that the closed-loop heat exchanger designs yield very low energy production per foot of wellbore drilled.

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