Download or read book Geomechanical Analysis to Predict the Oil Leak at the Wellbores in Big Hill Strategic Petroleum Reserve written by and published by . This book was released on 2014 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oil leaks were found in wellbores of Caverns 105 and 109 at the Big Hill Strategic Petroleum Reserve site. According to the field observations, two instances of casing damage occurred at the depth of the interbed between the caprock bottom and salt top. A three dimensional finite element model, which contains wellbore element blocks and allows each cavern to be configured individually, is constructed to investigate the wellbore damage mechanism. The model also contains element blocks to represent interface between each lithology and a shear zone to examine the interbed behavior in a realistic manner. The causes of the damaged casing segments are a result of vertical and horizontal movements of the interbed between the caprock and salt dome. The salt top subsides because the volume of caverns below the salt top decrease with time due to salt creep closure, while the caprock subsides at a slower rate because the caprock is thick and stiffer. This discrepancy yields a deformation of the well. The deformed wellbore may fail at some time. An oil leak occurs when the wellbore fails. A possible oil leak date of each well is determined using the equivalent plastic strain failure criterion. A well grading system for a remediation plan is developed based on the predicted leak dates of each wellbore.
Download or read book Interface Modeling to Predict Well Casing Damage for Big Hill Strategic Petroleum Reserve written by and published by . This book was released on 2012 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oil leaks were found in well casings of Caverns 105 and 109 at the Big Hill Strategic Petroleum Reserve site. According to the field observations, two instances of casing damage occurred at the depth of the interface between the caprock and top of salt. This damage could be caused by interface movement induced by cavern volume closure due to salt creep. A three dimensional finite element model, which allows each cavern to be configured individually, was constructed to investigate shear and vertical displacements across each interface. The model contains interfaces between each lithology and a shear zone to examine the interface behavior in a realistic manner. This analysis results indicate that the casings of Caverns 105 and 109 failed by shear stress that exceeded shear strength due to the horizontal movement of the top of salt relative to the caprock, and tensile stress due to the downward movement of the top of salt from the caprock, respectively. The casings of Caverns 101, 110, 111 and 114, located at the far ends of the field, are predicted to be failed by shear stress in the near future. The casings of inmost Caverns 107 and 108 are predicted to be failed by tensile stress in the near future.
Download or read book Interface Modeling to Predict Wellbore Damage for Big Hill Strategic Petroleum Reserve written by and published by . This book was released on 2013 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Petroleum Rock Mechanics written by Bernt S. Aadnoy and published by Gulf Professional Publishing. This book was released on 2011-07-13 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: Petroleum Rock Mechanics: Drilling Operations and Well Design covers the fundamentals of solid mechanics and petroleum rock mechanics and their application to oil and gas-related drilling operations and well design. More specifically, it examines the role of formation, strength of rock materials, and wellbore mechanics, along with the impact of in-situ stress changes on wellbore and borehole behavior. Practical examples with solutions and a comprehensive glossary of terminologies are provided. Equations are incorporated into well-known failure criteria to predict stresses and to analyze a range of failure scenarios throughout drilling, well operation, and well completion processes. The book also discusses stress and strain components, principal and deviatoric stresses and strains, materials behavior, the theories of elasticity and inelasticity, probabilistic analysis of stress data, the tensile and shear strength of rocks, wellbore stability, and fracture and collapse behavior for both single and multi-lateral wells. Both inexperienced university students and experienced engineers will find this book extremely useful. - Clearly applies rock mechanics to on and off shore oil and gas drilling - Step by Step approach to the analyze wellbore instabilities - Provides worked out examples with solutions to everyday problems
Download or read book Geomechanical Analysis of the Wellbore Instability Problems in Nahr Umr Formation Southern Iraq written by Haider Qasim Mohammed and published by . This book was released on 2017 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Wellbore instability problems play a major rule of increasing nonproductive time (NPT) during drilling processes. In most cases, the cost of drilling a well can be reduced by designing a suitable operational window using geomechanical models. Several wellbore instability problems have been encountered during drilling Nahr Umr Formation in an oil field in southern Iraq. These problems include but are not limited to, mechanical stuck, caving, and tight holes. Data from twenty vertical wells are investigated to reveal the major factors that control the instability problems and to design an optimum mud window. A geomechanical model is developed to determine the in-situ stress and induced stresses by using numerous field and laboratory data for Nahr Umr Formation. Mohr-Coulomb and Mogi-Coulomb failure criteria are used to predict the breakout profile and to estimate the optimum mud weight to avoid sticking. Our analysis shows that the majority of wellbore instability problems are mainly caused by, rock failure (shear failure) around the wellbore due to high stresses and low rock strength, and inappropriate drilling practice with respect to the heterogeneity of Nahr Umr Formation. Moreover, the wellbore failure analysis demonstrates the necessity of core analyses and field tests such as the triaxial test and the mini-frac. test to improve the geomechanical model when studying lithology with high heterogeneity"--Abstract, page iii.
Download or read book Oil Spills and Gas Leaks Environmental Response Prevention and Cost Recovery written by Stephen M. Testa and published by McGraw Hill Professional. This book was released on 2013-02-01 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: The definitive guide to petroleum hydrocarbon fuel spill and leak causes, prevention, response, and cost recovery Oil Spills and Gas Leaks highlights the complex nature of petroleum hydrocarbon fuel extraction methods, the unintended consequences when disasters occur, spill behavior, and environmental impact mitigation. This practical resource discusses engineering techniques; long-term biological and environmental effects; dealing with insurance claims, litigation, and legislation in overlapping jurisdictions; and much more. Featuring global case studies and best practices, this timely volume provides an in-depth understanding of how oil spills and gas leaks occur and describes the most effective environmental assessment, remediation, and restoration options available to respond to these industrial accidents. Coverage includes: The role of petroleum hydrocarbon fuels in society Geology and geochemistry of oil and gas deposits Oil and gas well drilling and production issues Hydraulic fracturing for shale gas and oil Behavior of oil spills in various environments Behavior of gas leaks in various environments Assessment of spills and leaks Toxicity issues and exposure pathways Subsurface investigations Sampling strategies and remedial approaches Sampling methods on land and offshore Prevention, oversight, and mitigation Remediation of oil spills Case histories and cost recovery Oil spills and wildlife Oil spills and safety issues Conclusions and recommendations
Download or read book Petroleum Geomechanics Characterization Using Coupled Numerical Modeling and Soft Computing written by Shike Zhang and published by . This book was released on 2013 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Petroleum geomechanics characterization is very important for conducting successful geomechanics operations such as reservoir compaction, associated surface subsidence, wellbore stability, hydraulic fracturing and coupled geomechanics-reservoir simulation in petroleum engineering. However, there are two big challenges which restrict accurate petroleum geomechanics characterization. The first challenge is deep subsurface formation. Restricted access to subsurface formation makes this characterization challenging. Consider oil, gas and geothermal reservoirs both conventional and unconventional which are more than the average depth of 200 m, making it very difficult for engineers and geoscientists to accurately obtain the geomechanical parameters with the traditional methods such as core analysis, field test methods and observation of discontinuity states. The other challenge is that there is usually a nonlinear relationship between the geomechanical parameters and the geomechanical behavior of rock mass. Because the traditional methods are mainly based on the linear theory, this remains a challenge and desires that we seek to develop an effective and reliable linear and/or nonlinear regression procedure to overcome the complex spatial relationship for petroleum geomechanics characterization. Inverse analysis can help overcome these challenges by taking advantage of field-observed and recorded information. Thus, inverse analysis has been receiving increasing attention in various fields of science and engineering, and can be defined as the one in which model parameters are obtained from the given observed data. In this dissertation, a displacement and pressure based inverse analysis method using coupled numerical modeling and soft computing is presented in more detail for petroleum geomechanics characterization in oil, gas and geothermal reservoirs. It can effectively overcome several disadvantages of traditional methods in estimating the geomechanical parameters, for example sample disturbance problem encountered in laboratory testing of geomechanical parameters, high cost to obtain core from the in-situ formation in the deep subsurface, and lack of effective tools to measure the fracture properties directly. In this integrated inverse analysis method, a forward modeling is used to (1) create the training and testing samples for artificial neural network (ANN) model, and (2) verify if the identification results are accurate by using back substitution calculation. The ANN model is used as an alternative to the numerical modeling to establish the objective function for optimization search of genetic algorithm (GA). And GA is used as an optimization and search tool to characterize the geomechanical parameters based on the objective function established by a combination of the ANN-predicted values and the field-observed information. In addition, some applications are presented in detail in this dissertation to illustrate the proposed methodology can effectively conduct petroleum geomechanics characterization by utilizing the available field-observed and recorded information in petroleum engineering. For instance, with measured ground surface movements, petroleum goemechanics properties such as Young's modulus, Poisson's ratio, internal friction angle and cohesion, can be characterized; with measured wellbore deformation during drilling, petroleum geomechanics properties such as the maximum and minimum horizontal earth stresses and the spacing, aperture, orientation stiffness of natural fracture, can be characterized in the oil, gas and geothermal reservoirs; with wellbore pumping pressures during hydraulic fracturing tests, petroleum geomechanics such as horizontal earth stress state, elastic parameters and fracture properties can be characterized in both conventional and unconventional reservoirs. This work also demonstrates that an inverse analysis technique based on the integration of coupled numerical modeling, artificial neural network and genetic algorithm combination is an effective and robust method to characterize natural fracture stiffness and spacing that there is currently no effective method of estimating in petroleum engineering.
Download or read book Unconventional Reservoir Geomechanics written by Mark D. Zoback and published by Cambridge University Press. This book was released on 2019-05-16 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive overview of the key geologic, geomechanical and engineering principles that govern the development of unconventional oil and gas reservoirs. Covering hydrocarbon-bearing formations, horizontal drilling, reservoir seismology and environmental impacts, this is an invaluable resource for geologists, geophysicists and reservoir engineers.
Download or read book Wellbore Stability and Integrity written by Meng Meng and published by Gulf Professional Publishing. This book was released on 2023-09-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A demand for better understanding on wellbore stability and integrity is increasing in the global energy market where traditional oil and gas well practices are extending to CO2 sequestration, geothermal, and offshore. A comprehensive understanding of modeling and failure analysis of wellbore systems is critical to serve the common oil and gas wellbore as well as future activities. Wellbore Stability and Integrity: Models and Case Studies for Oil and Gas, Geothermal, and CO2 Sequestration gives today's engineers both the foundations and practical applications needed to mitigate common and future wellbore challenges. Organized into distinct parts, the authors start with problem-oriented and step-by-step instructions on how to model wellbore stability and integrity from fundamental elastic models before moving on to more advanced thermo-chemo-poro-elastic models. Dynamic loading and multiphase flow effects are also introduced. The authors then move to a comprehensive comparison between analytical methods and numerical methods in modeling wellbore stability and integrity with recommendations for field applications of specific problems. Last, the reference provides guidelines for researchers and engineers on future research developments that support the energy transition such as geothermal wellbores and CO2 storage capability. Supported by case studies throughout, Wellbore Stability and Integrity: Models and Case Studies for Oil and Gas, Geothermal, and CO2 Sequestration delivers a critical tool for engineers to solve the future of wellbores.
Download or read book Geomechanical Modeling to Predict Wellbore Stresses and Strains for the Design of Wellbore Seal Repair Materials for Use at a CO2 Injection Site written by and published by . This book was released on 2015 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geomechanical Assessment of Leakage Through Oil Wellbores written by Ahmad Nabih A. Alsayed and published by . This book was released on 2014 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon capture and storage (CCS) is an approach to reduce carbon dioxide (CO2) emissions. The approach involves three main steps; capturing, transporting, and storing of CO2. Storing is done by injecting CO2 directly into underground deep geological formations such as depleted oil and gas reservoirs, un-minable coal seams, saline formations, and declining oil and gas reservoirs. Safe storage of CO2 into oil and gas reservoirs depends mainly on the caprock sealing that provide a physical natural barrier for leakage to the surface and/or a strata where other energy, mineral and/or groundwater resources are present. Storage integrity assurance is controlled by two mechanisms; geological leakage mechanism and wellbore leakage mechanism. In all problems, dealing with CCS, safety assessment of wellbore integrity is a major challenge. Researchers' main objective is to gain more information and knowledge to understand wellbore behavior under different states and/or conditions. However, all of these efforts are scattered and dispersed due to either the various approaches of the study and the multi-disciplinary nature of the problem. There is no unified and universally accepted procedure to investigate wellbore leakage mechanism. There is a need for a methodology to standardize the assessment of wellbore integrity in a more regulatory manner. To be a standard code of practice, key elements of the methodology must be gathered, recognized, classified, and systematically ordered. Such considerations necessitate an appropriate procedure that can be standardized and considered as a sound practical tool to check the safety evaluation of wellbores with respect to wellbore leakage mechanism. Wellbore sealing efficiency index is introduced to assess wellbore leakage mechanism with engineering rigor. It can be used as a quantification index to assess wellbore leakage failure mechanism. The index is proposed to be a criterion to rank different wellbore elements in the same formation, to compare with different elements within the same wellbore, and/or to check the safety condition of wellbore. Two indices, storage index and permeability index, are found to govern wellbore leakage mechanism and facilitate the creation of wellbore performance charts that monitor and check wellbores' leakage mechanism and their lifecycle performance.
Download or read book Estimation of Geomechanical Parameters and In situ Stresses for an Oil Field in Saskatchewan Based on Borehole Deformation written by Brett McIntosh and published by . This book was released on 2014 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: In-situ stresses are important geomechanical parameters for wellbore stability analysis, hydraulic fracture design and coupled geomechanics-reservoir simulation. Conventional characterization method involves costly field injection tests. In this work, low-cost numerical modeling and soft computing is performed to characterize the in-situ stresses at an oil field in Saskatchewan, based on well logs that are widely available. First, a forward geomechanical model is built at borehole scale, to create multiple samples with varying in-situ stresses as input parameters, and associated displacements on borehole wall as output. Second, with these obtained samples, an artificial neural network (ANN) model is trained to map the relationship between in-situ stresses and displacements on the borehole wall. Third, a genetic algorithm (GA) is integrated with ANN model to perform the inverse analysis: given a certain range of in-situ stresses, ANN is able to predict the displacements at the borehole, an objective function is defined as the difference between the ANN-predicted displacements and the displacements observed from the well logs. Based on this objective function, the GA is able to search the optimal in-situ stresses from the given ranges. Lastly, the in-situ stresses obtained from the inverse analysis are compared with those from the hydraulic fracturing test performed in the oil field. The comparison shows that the in-situ stresses obtained from inverse analysis is consistent with those from the field hydraulic fracture test.
Download or read book The Geotechnical and Economic Constraints of the US Strategic Petroleum Reserve written by Benjamin A. Eisterhold and published by . This book was released on 2008 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geomechanical Analyses to Investigate Wellbore written by and published by . This book was released on 2010 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geomechanical analyses have been performed to investigate potential mine interactions with wellbores that could occur in the Potash Enclave of Southeastern New Mexico. Two basic models were used in the study; (1) a global model that simulates the mechanics associated with mining and subsidence and (2) a wellbore model that examines the resulting interaction impacts on the wellbore casing. The first model is a 2D approximation of a potash mine using a plane strain idealization for mine depths of 304.8 m (1000 ft) and 609.6 m (2000 ft). A 3D wellbore model then considers the impact of bedding plane slippage across single and double cased wells cemented through the Salado formation. The wellbore model establishes allowable slippage to prevent casing yield.
Download or read book Lost Circulation and Wellbore Strengthening written by Yongcun Feng and published by Springer. This book was released on 2018-05-14 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the underlying mechanisms of lost circulation and wellbore strengthening, presenting a comprehensive, yet concise, overview of the fundamental studies on lost circulation and wellbore strengthening in the oil and gas industry, as well as a detailed discussion on the limitations of the wellbore strengthening methods currently used in industry. It provides several advanced analytical and numerical models for lost circulation and wellbore strengthening simulations under realistic conditions, as well as their results to illustrate the capabilities of the models and to investigate the influences of key parameters. In addition, experimental results are provided for a better understanding of the subject. The book provides useful information for drilling and completion engineers wishing to solve the problem of lost circulation using wellbore strengthening techniques. It is also a valuable resource for industrial researchers and graduate students pursuing fundamental research on lost circulation and wellbore strengthening, and can be used as a supplementary reference for college courses, such as drilling and completion engineering and petroleum geomechanics.
Download or read book Update of Assessment of Geotechnical Risks Strategic Petroleum Reserve Weeks Island Site written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Wellbore Stability Analysis and Pore Pressure Prediction Modeling Parameters written by Ahmet Serkan Cenberlitas and published by . This book was released on 2006 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt:
