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Collaborating Authors
Alberta
Combining unsupervised deep learning and Monte Carlo dropout for seismic data reconstruction and its uncertainty quantification
Chen, Gui (China University of Petroleum-Beijing, China University of Petroleum-Beijing) | Liu, Yang (China University of Petroleum-Beijing, China University of Petroleum-Beijing, China University of Petroleum-Beijing at Karamay)
ABSTRACT Many methods, such as multichannel singular spectrum analysis (MSSA) and deep seismic prior (DSP), have been developed for seismic data reconstruction, but they do not quantify the uncertainty of reconstructed traces, relying on the subjective visual inspection of results. Our goal is to quantify the reconstructed uncertainty while recovering missing traces. We develop a framework including an unsupervised deep-learning-based seismic data reconstruction method and the existing Monte Carlo dropout method to achieve this goal. The only information required by our framework is the original incomplete data. A convolutional neural network trained on the original nonmissing traces can simultaneously denoise and reconstruct seismic data. For uncertainty quantification, the Monte Carlo dropout method treats the well-known dropout technique as Bayesian variational inference. This refers to the fact that the dropout technique can be regarded as an approximation to the probabilistic Gaussian process and thus can be used to obtain an approximate distribution (Bernoulli variational distribution) of the posterior distribution. The reconstructed result and uncertainty of the trained model are yielded through multiple Monte Carlo dropout simulations. The analysis of the reconstructed uncertainty quantifies the confidence to use reconstructed traces. Tests on synthetic and field data illustrate that our framework outperforms the MSSA and DSP methods on reconstructed accuracy and quantifies the reconstructed uncertainty as an objective benchmark to guide decision making.
- Asia > China (0.30)
- North America > Canada > Alberta > Woodlands County (0.24)
In-situ combustion processes are largely a function of oil composition and rock mineralogy. The extent and nature of the chemical reactions between crude oil and injected air, as well as the heat generated, depend on the oil-matrix system. Laboratory studies, using crude and matrix from a prospective in-situ combustion project, should be performed before designing any field operation. The chemical reactions associated with in-situ combustion are complex and numerous. They occur over a broad temperature range.
- North America > United States (1.00)
- North America > Canada > Alberta (0.29)
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
Distributed Acoustic Sensing (DAS) is a technology that enables continuous, real-time measurements along the entire length of a fiber optic cable. The low-frequency band of DAS can be used to analyze hydraulic fracture geometry and growth. In this study, the low-frequency strain waterfall plots with their corresponding pumping curves were analyzed to obtain information on fracture azimuth, propagation speed, number of fractures created in each stage, and re-stimulation of pre-existing fractures. We also use a simple geomechanical model to predict fracture growth rates while accounting for changes in treatment parameters. As expected, the hydraulic fractures principally propagate perpendicular to the treated well, that is, parallel to the direction of maximum horizontal stress. During many stages, multiple frac hits are visible indicating that multiple parallel fractures are created and/or re-opened. Secondary fractures deviate towards the heel of the well, likely due to the cumulative stress shadow caused by previous and current stages. The presence of heart-shaped tips reveals that some stress and/or material barrier is overcome by the hydraulic fracture. The lobes of the heart are best explained by the shear stresses at 45-degree angles from the fracture tip instead of the tensile stresses directly ahead of the tip. Antennas ahead of the fracture hits indicate the re-opening of pre-existing fractures. Tails in the waterfall plots provide information on the continued opening, closing, and interaction of the hydraulic fractures within the fracture domain and stage domain corridors. Analysis of the low-frequency DAS plots thus provides in-depth insights into the rock deformation and rock-fluid interaction processes occurring close to the observation well.
- North America > Canada > Alberta (1.00)
- North America > United States (0.67)
- North America > Canada > British Columbia > Western Canada Sedimentary Basin > Alberta Basin > Montney Formation Field > Montney Formation (0.99)
- North America > Canada > British Columbia > Western Canada Sedimentary Basin > Alberta Basin > Montney Formation (0.99)
- North America > Canada > Alberta > Western Canada Sedimentary Basin > Greater Peace River High Basin > Pouce Coupe Field (0.99)
- (2 more...)
- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Completion > Hydraulic Fracturing (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (1.00)
- Production and Well Operations > Well & Reservoir Surveillance and Monitoring > Production logging (1.00)
Abstract This presentation will discuss how the existing corrosion resistant pipeline solutions measure against the performance characteristics required for safe and reliable corrosion-resistant pipelines in the oil and gas industry. This evaluation will survey the performance requirements of corrosion-resistant pipeline solutions considering technical, construction, economic and ESG (Environmental, Social and Governance) perspectives and will compare those requirements to the characteristics of the available corrosion-resistant pipeline systems. This presentation also includes a case study covering the use of an innovative factory lined carbon steel pipeline product in a produced water network for a global exploration and production company in the Rocky Mountain region of the USA. As the corrosion-resistant pipeline options are engineered systems that vary in construction, performance, economics and ESG characteristics, this presentation will highlight the advantages and disadvantages of the various corrosion-resistant pipeline options and will provide criteria for material selection in order to achieve safe and reliable corrosion-resistant pipelines within the oil and gas industry. This presentation will provide the pipelines professional with relevant considerations to support the decision-making process related to the material selection of corrosion-resistant pipelines.
- North America > United States (0.24)
- North America > Canada > British Columbia (0.24)
- North America > Canada > Alberta (0.24)
- Materials > Metals & Mining (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Energy > Oil & Gas > Midstream (1.00)
- Construction & Engineering (1.00)
This new educational video series provides you with career tools to get noticed and rise above the rest. Today, managing technical competence and personal development largely rests on the employees' shoulders. Career development can feel like a daunting task for any individual, but there are many tools available to make it easier for you to identify and fill your knowledge gaps and demonstrate your professional prowess. Each webinar is a 1-hour presentation followed by a live/recorded 30-minute Q&A session. It also features a post-webinar Happy Hour event via Facebook where you can ask the speaker anything!
- Asia (1.00)
- North America > United States (0.72)
- North America > Canada > Alberta (0.15)
- Energy > Oil & Gas > Upstream (1.00)
- Education > Educational Setting > Online (1.00)
- Education > Educational Technology > Educational Software > Computer Based Training (0.87)
Investigating the Impact of Aqueous Phase on CO2 Huff โnโ Puff in Tight Oil Reservoirs Using Nuclear Magnetic Resonance Technology: Stimulation Measures and Mechanisms
Liu, Junrong (School of Petroleum Engineering, China University of Petroleum (East China)) | Li, Hangyu (Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China)) | Liu, Shuyang (SchoolSchool of Petroleum Engineering, China University of Petroleum (East China)) | Xu, Jianchun (Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China) (Corresponding author) of Petroleum Engineering, China University of Petroleum (East China)) | Wang, Xiaopu (School of Petroleum Engineering, China University of Petroleum (East China)) | Tan, Qizhi (Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China))
Summary CO2 huff โnโ puff is a promising enhanced oil recovery (EOR) technique for tight/shale reservoirs, also enabling CO2 geological storage. However, the effectiveness of this method can be significantly affected by the aqueous phase resulting from connate water and hydraulic fracturing. The mechanism underlying the influence of the aqueous phase on oil recovery during CO2 huff โnโ puff, as well as the corresponding stimulation methods in such scenarios, remain unclear and warrant further study. To investigate this, we utilized a nuclear magnetic resonance (NMR) instrument to track the movement of fluids during CO2 huff โnโ puff under water invasion conditions. The impact of the invaded aqueous phase on oil recovery was examined, and the impact of different treatment parameters was explored. The results show that the aqueous barrier formed by water invasion alters the pathway of CO2 diffusion to matrix oil. This alteration leads to a diminished concentration of CO2 in the oil phase, which, in turn, results in a substantial reduction in oil recovery. Consequently, the performance of CO2 huff โnโ puff is highly sensitive to the water phase. Nevertheless, the oil recovery dynamics in cyclic CO2 huff โnโ puff under water invasion exhibit distinctive patterns compared with those without water invasion. These differences manifest as notable low oil recovery in the first cycle, followed by a rapid increase in the second cycle. This behavior primarily arises from the expulsion of a significant portion of the invaded water from the macropores after the first cycle. However, the effectiveness of this mechanism is limited in micropores due to the challenging displacement of trapped water in such pores. Raising the injection pressure mainly boosts oil recovery in macropores, with minimal response in micropores. Yet, the achievement of miscibility does not lead to a substantial improvement in the CO2 huff โnโ puff performance, primarily due to the constraints imposed by the limited CO2 dissolution through molecular diffusion Additionally, we have proposed three stimulation mechanisms achieved by lengthening the soaking time under water invasion conditions. First, the prolonged soaking time increases the concentration of CO2 molecules that diffuse into the matrix oil. Second, it promotes the imbibition of the trapped water on the fracture surface into the deeper matrix to alleviate water blockage. Finally, the invaded water in macropores displaces oil in micropores by capillary force during the soaking period.
- North America > United States > Texas (0.46)
- North America > Canada > Alberta (0.46)
- Research Report > New Finding (1.00)
- Research Report > Experimental Study (0.88)
- Geology > Mineral (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (0.49)
- North America > United States > Texas > West Gulf Coast Tertiary Basin > Eagle Ford Shale Formation (0.99)
- North America > United States > Texas > Sabinas - Rio Grande Basin > Eagle Ford Shale Formation (0.99)
- North America > United States > Texas > Maverick Basin > Eagle Ford Shale Formation (0.99)
- (6 more...)
Numerical Analysis of Permeability Changes for Clogging and Microcracks Induced by the Invasion of Fracturing Fluid
Liu, Bailong (Institute of Fluid Science, Tohoku University (Corresponding author)) | Yang, Deyi (Institute of Fluid Science, Tohoku University) | Ito, Takatoshi (Institute of Fluid Science, Tohoku University)
Institute of Fluid Science, Tohoku University Summary Hydraulic fracturing can produce a main fracture and increase flow efficiency. It can also result in the invasion of fracturing fluid, which can produce clay swelling. The invasion can block the pores and throats in the porous media and damage matrix permeability, while it can also induce microcracks under certain conditions. This study developed a numerical model to evaluate the permeability change induced by the invasion. Both pore-throat clogging and microcracks are integrated into the model. The numerical model coupled a flow model based on the pore-scale network method (PNM), a solid model, and a permeability evaluation model. The solid model and permeability evaluation model are based on our microcrack performance model reported previously. We validated the flow model by analytical results and the coupled model by previous experiments of the soaking test. Simulation results show that the invasion can decrease the permeability for the clogging effect and increase the permeability for the microcrack generation. The generation of microcracks can greatly increase the permeability even with the clogging effect for clay swelling. Our simulation results indicated that rock properties can affect the effect of clogging and microcracks on permeability. This study provides an approach for the selection of fracturing fluid and the design of fracturing fluid flowback. This is crucial for the understanding of the invasion on permeability and can serve as a guide for fracturing operations.
- North America > Canada > Alberta (0.28)
- Asia > Japan > Tลhoku (0.24)
- Research Report > New Finding (0.48)
- Research Report > Experimental Study (0.48)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Mineral > Silicate > Phyllosilicate (0.59)
Effect of Calcium Expansive Additives on the Performance of Granite-Based Geopolymers for Zonal Isolation in Oil and Gas Wells
Gomado, Foster Dodzi (Department of Energy and Petroleum Engineering, Faculty of Science and Technology, University of Stavanger (Corresponding author)) | Khalifeh, Mahmoud (Department of Energy and Petroleum Engineering, Faculty of Science and Technology, University of Stavanger) | Saasen, Arild (Department of Energy and Petroleum Engineering, Faculty of Science and Technology, University of Stavanger) | Sanfelix, Susana G. (Department of Engineering, Faculty of Computer Science, Engineering and Economics, รstfold University College) | Kjรธniksen, Anna-Lena (Department of Engineering, Faculty of Computer Science, Engineering and Economics, รstfold University College) | Aasen, Jan Aage (Department of Energy and Petroleum Engineering, Faculty of Science and Technology, University of Stavanger)
Summary Geopolymers have emerged as a promising alternative to Portland cement for oil and gas wells. Achieving effective zonal isolation by use of geopolymers may require controlling their expansion. This study investigates the effect of calcium oxide (CaO) as an expansive agent on the performance of geopolymer-based sealing materials. Specifically, we explore the impact of CaO reactivity on various material properties using isothermal calorimetry, Brunauer-Emmett-Teller (BET) surface area analysis, linear expansion (LE) test, shear bond strength, compressive strength, and hydraulic bond strength (HBS). Our results indicate that CaO reactivity is a critical factor affecting the properties and performance of geopolymers for zonal isolation. Lower reactivities are associated with longer induction periods and lower heat evolution, which in turn increase LE. While lower reactivity decreases compressive strength, it increases shear bond strength. However, the CaO with the lowest reactivity resulted in a very low HBS due to matrix cracking and leakage. Therefore, optimizing the reactivity of CaO expansive agents is essential to enhancing the properties of geopolymer-based sealing materials for oil and gas wells. Shown in this paper is the successful application of CaO as an expansive agent for granite-based geopolymers at shallow depths in oil and gas wells.
- North America > United States (1.00)
- Europe (1.00)
- North America > Canada > Alberta (0.28)
- Research Report > New Finding (0.34)
- Overview (0.34)
- Well Drilling > Drilling Fluids and Materials > Drilling fluid selection and formulation (chemistry, properties) (1.00)
- Well Drilling > Casing and Cementing > Cement formulation (chemistry, properties) (1.00)
- Health, Safety, Environment & Sustainability > Environment (0.94)
- Well Completion > Well Integrity > Zonal isolation (0.82)
Upon completion of this course, participants are expected to have a good understanding of the characteristics of the machine learning approaches and be able to use them to identify potential application domains in the upstream oil and gas industry. They will acquire detailed knowledge of the popularly used machine learning algorithms and the workflow to employ these algorithms to solve petroleum engineering problems. Finally, they will see the demonstrations of different machine learning algorithms to reservoir characterization, production analysis, well productivity forcast, and recovery enhancement in tight/shale reservoirs.
- North America > Canada > Saskatchewan > Western Canada Sedimentary Basin > Alberta Basin (0.99)
- North America > Canada > Northwest Territories > Western Canada Sedimentary Basin > Alberta Basin (0.99)
- North America > Canada > Manitoba > Western Canada Sedimentary Basin > Alberta Basin (0.99)
- (2 more...)
Xianhuai Zhu is recognized for his meritorious service to the Society and SEG China. Zhu, a 2012 recipient of SEG's Reginald Fessenden Award, served on the SEG Board of Directors from 2014 to 2017 as a director at large. He also served as a Geophysics associate editor from 1997 to 2002. In addition to those duties, he has served as member or chair of several committees and continues to be a valued volunteer for SEG. Xianhuai Zhu, a native of Yixing, China, and currently the president and CEO of Forland Geophysical Services, is awarded SEG Life Membership for his voluntarily rendered, meritorious service to professional societies and the geophysical community.
- Asia > China (1.00)
- North America > United States > Texas (0.16)
- North America > Canada > Alberta (0.15)
- Asia > China > Sichuan > Sichuan Basin (0.99)
- Asia > China > Jiangsu Basin > Jiangsu Field (0.99)
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)