Download or read book The Pore Pressure Bulk Density and Lithology Prediction written by Olalere Sunday Oloruntobi and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The pore and fracture pressures are the two most important parameters required for the effective well design. In general, the difference between the two parameters at any given depth dictates the drilling window with no consideration for wellbore stability. While pore pressure prediction from the drilling parameters started in the mid-nineties, very few improvements have been made in these areas when compared to other pore pressure prediction techniques such as seismic and well logs. Pore pressure prediction using the d-exponent method does not consider the effect of bit hydraulic energy on the rate of penetration (ROP). This limits the application of the d-exponent to mostly hard rock environments. Under downhole conditions where the bit hydraulic energy has a significant influence on the ROP (soft rock environments), the d-exponent method may produce inaccurate results. Hence, the primary goal of this research is to develop new pore pressure prediction models from the drilling parameters that incorporate the bit hydraulic energy, making them suitable for any subsurface drilling conditions. The new pore pressure prediction models use the concept of specific energy to predict the onset of overpressure. The concept of specific energy is then extended to the real-time identification of subsurface lithology. Furthermore, overburden pressure is an important input parameter in pore pressure prediction. Inaccurate prediction of overburden pressure may result in the erroneous prediction of pore pressure which can lead to well control and process safety incidents. In areas where density logs are not available, synthetically derived density logs are used for overburden pressure computations. In this research, an attempt is also made to improve the accuracy of pore pressure prediction by improving the accuracy of overburden pressure computation via improvement in density logs prediction. Finally, since pore and fracture pressures are closely related, an attempt is made to develop a new fracture pressure prediction model for the Niger Delta basin.
Download or read book Pore Pressure written by P. E. Gretener and published by . This book was released on 1978 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Elastic Properties Prediction for Drilling and Subsurface Evaluation for the Grand Banks and Niger Delta written by Babatunde Olaiya Yusuf and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Formation bulk density (RhoB) is an essential parameter which can provide very useful information required for planning the position of a new well and properly characterize a reservoir for effective field development. Several correlations had been developed in the past decades to estimate bulk density. A previous study done using data from the Grand Banks reveal that the prior density-velocity relations could not predict density accurately in the five wells studied. The two major problems with these empirical relationships are: (1) they were developed primarily for clean formations and they have failed to produce reasonable estimates in non-clean/mixed-lithology formations; (2) they are not applicable to rocks that contain micro-cracks/fractures. There is no single model that has dealt with these two problems. In this thesis, a new formation bulk density prediction method that can be applied to clean formations, non-clean/mixed-lithology formations and rocks that contain micro-cracks is proposed. The model is validated with additional laboratory measurements on cores and field-tested with field wireline log data from the Niger Delta and Grand banks basins. The most reliable method of deriving the shear wave velocity is by estimation from compressional wave velocity. Most old wells lack shear wave velocity data and for the wells drilled recently, the need to verify poor quality data makes the development of models very important. A region-specific model is proposed for more accurate derivation of shear wave velocity from compressional wave velocity applicable to the Grand Banks. This model was found to predict better than prior models. Poisson's ratio is commonly utilized in estimation of fracture pressure. There is need to develop a correlation specific for the Grand Banks. The availability of sufficient well data, a depth trend of Leak-off-test (LOT) data and series of Modular Dynamic Formation Tester (MDT) type data were used to establish a depth trend of fracture pressure and pore pressure profiles to aid successful well planning. The application of outputs from these models and correlations to subsurface reservoir characterization and field development was tested using the Excess Pressure (EP) methodology.
Download or read book Principal Stress Pore Pressure Prediction written by Kyle Wade Richardson and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A novel method of predicting pore pressure has been invented. The method utilizes currently recorded drilling measurements to predict the pore pressure of the formation through which the bit is drilling. The method applies Mohr's Theory to describe the stresses at the bottom of the borehole. From the stress state and knowledge of Mohr's Envelope, the pore pressure is predicted. To verify the method, a test procedure was developed. The test procedure enabled systematic collection and processing of the drilling data to calculate the pore pressure prediction. The test procedure was then applied to industry data that was recorded at the surface. The industry data were composed of wells from different geographical regions. Two conclusions were deduced from the research. First, Mohr's Theory indicates that the model is valid. Second, because of too much variation in the torque measurements the model cannot be proved and requires further investigation.
Download or read book Pore Pressure written by Peter E. Gretener and published by . This book was released on 1976 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pore Pressure Prediction written by Landon Paul Lockhart and published by . This book was released on 2018 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: My thesis focuses on evaluating the relative contribution of both mean stress and deviatoric (shear) stress and understanding how to incorporate their role in order to better predict pore pressure. In Chapter 1, I introduce my thesis by providing a brief background of pore pressure prediction, discussing the importance of using the full stress tensor (mean and shear stress) to predict stress and pressure, and summarizing the agenda of the following two Chapters. In Chapter 2, I predict pore pressure in the deepwater Gulf of Mexico Mad Dog Field, using three different methods that are based on (i) the vertical effective stress (VES), (ii) the mean effective stress (MES), and (iii) the full stress tensor (FES). The VES and MES methods are traditional workflows, whereas the FES method is a new technique. I use ultra-high resolution sonic velocity data, geomechanical modeling, and the Modified Cam Clay soil model. I compare the predicted pore pressures against those that were measured while drilling. I also evaluate the fraction of pore pressure induced by the mean stress and deviatoric (shear) stress. I show that the MES method can account for the mean stress-induced pressure, but neither VES nor MES can account for the deviatoric (shear) stress-induced pressure. In Chapter 3, I present the new University of Texas Full Application of Stress Tensor to Predict Pore Pressure (UT-FAST-P3) online software that I developed to predict pore pressure. I created the software to be a learning tool to illustrate how pore pressure and stress interact in non-uniaxial settings. I wrote the program to predict pore pressure based on the VES, MES, and FES methods. I communicate the results in a velocity vs. mean effective stress plot, and a mean effective stress vs. deviatoric (shear) stress plot. This allows for a side-by-side comparison of each method, thus providing physical insight into the relative contribution of mean stress and deviatoric (shear) stress to compression and pore pressure development. Overall, my thesis contributes to our understanding of the interaction of pressure and stress in the subsurface, demonstrates the importance of using the full stress tensor to predict pore pressure, and explores a new technique (FES approach) that is applicable to a wide range of complex geological environments where the traditional VES and MES methods underperform.
Download or read book Comparing Stress Permeability Models for Various Lithologies Through Permeability Compliance Pore Spacing and Bulk Modulus written by Mohammad Al Noaimi and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: We compare leading models for permeability evolution as a function of changing effective stress for various lithologies. In particular, the permeability compliance model as given in the literature is analyzed and compared to the cubic law, where changing pore aperture is cast in terms of pore spacing, bulk modulus, and changing pore pressure. Using equivalence relationships, it is shown that empirically derived values of permeability compliance for various lithologies can be used to determine the average spacing between pores used in the cubic law and related to the material strength of the rock (Bulk modulus). We derive equations for different rock types to calculate the pore network for each rock. In addition, we use values from the literature for bulk modulus for each lithology to calculate the permeability compliance and find excellent agreement with values for permeability evolution with changing stress found in the literature. The cubic law predicts permeability loss under the same conditions based on the density of pores (number and size per unit volume). If a rock has a denser pore network (small s/b) it will have more pores available to accommodate a given deformation, leading to smaller permeability loss. We find that the term (s/b*1/K) found in the cubic law is proportional to the permeability compliance, where s is the average spacing between pores, b is the average pore diameter, and K is the bulk modulus. Therefore, permeability compliance can be viewed as a description of a rock's ability to resist permeability loss due to the pore network's compression during pressure-driven deformation.
Download or read book Quantitative Analysis of Geopressure for Geoscientists and Engineers written by Nader C. Dutta and published by Cambridge University Press. This book was released on 2021-03-11 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geopressure, or pore pressure in subsurface rock formations impacts hydrocarbon resource estimation, drilling, and drilling safety in operations. This book provides a comprehensive overview of geopressure analysis bringing together rock physics, seismic technology, quantitative basin modeling and geomechanics. It provides a fundamental physical and geological basis for understanding geopressure by explaining the coupled mechanical and thermal processes. It also brings together state-of-the-art tools and technologies for analysis and detection of geopressure, along with the associated uncertainty. Prediction and detection of shallow geohazards and gas hydrates is also discussed and field examples are used to illustrate how models can be practically applied. With supplementary MATLAB® codes and exercises available online, this is an ideal resource for students, researchers and industry professionals in geoscience and petroleum engineering looking to understand and analyse subsurface formation pressure.
Download or read book Pressure Regimes in Sedimentary Basins and Their Prediction written by Alan R. Huffman and published by AAPG. This book was released on 2002 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Title available in Digital Reprint form on CD-ROM
Download or read book A Concise Guide to Geopressure written by Peter B. Flemings and published by Cambridge University Press. This book was released on 2021-03-25 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: A concise guide to the origins and prediction of subsurface fluid pressures, emphasizing the interactions with geological processes.
Download or read book Origin and Prediction of Abnormal Formation Pressures written by V.A. Serebryakov and published by Gulf Professional Publishing. This book was released on 2002-05-24 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Knowledge of the presence of abnormally-high pressure zones (AHFP) prior to drilling into them can prevent considerable economic losses and, possibly, save human lives. The various origins (undercompaction, tectonics, etc.) of AHFPs are discussed, followed by the description of predictive techniques in clastic, carbonate and salt-bearing formations. In addition to the well-logging predictive techniques, the authors discuss smectite-illite transformation and the chemistry of interstitial solutions. Other topics covered include (a) abnormally low formation pressures and subsidence, and (b) mathematical modelling. Loss of potential production may result if AHFPs are not properly identified and evaluated. Many hydrocarbon-bearing formations with AHFPs are erroneously "condemned". This book is of interest to engineers and geologists involved in the (a) evaluation, (b) drilling in, (c) completing, and (d) producing from hydrocarbon reservoirs with AHFPs.
Download or read book The Rock Physics Handbook written by Gary Mavko and published by Cambridge University Press. This book was released on 2009-04-30 with total page 525 pages. Available in PDF, EPUB and Kindle. Book excerpt: A significantly expanded new edition of this practical guide to rock physics and geophysical interpretation for reservoir geophysicists and engineers.
Download or read book Compaction of Argillaceous Sediments written by H.H. Rieke and published by Elsevier. This book was released on 1974-01-01 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compaction of Argillaceous Sediments
Download or read book Quantitative Analysis of Geopressure for Geoscientists and Engineers written by Nader C. Dutta and published by Cambridge University Press. This book was released on 2021-03-11 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: An overview of the processes related to geopressure development, prediction and detection using state-of-the-art tools and technologies.
Download or read book The Rock Physics Handbook written by Gary Mavko and published by Cambridge University Press. This book was released on 2020-01-09 with total page 741 pages. Available in PDF, EPUB and Kindle. Book excerpt: Brings together widely scattered theoretical and laboratory rock physics relations critical for modelling and interpretation of geophysical data.
Download or read book Offset dependent Reflectivity written by John P. Castagna and published by SEG Books. This book was released on 1993 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recognizing the need for education and further research in AVO, the editors have compiled an all-encompassing treatment of this versatile technology. In addition to providing a general introduction to the subject and a review of the current state of the art, this unique volume provides useful reference materials and data plus original contributions at the leading edge of AVO technologies.
Download or read book Methods and Applications in Reservoir Geophysics written by David H. Johnston and published by SEG Books. This book was released on 2010 with total page 669 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reservoir-engineering tutorial discusses issues and data critically important engineers. The geophysics tutorial has explanations of the tools and data in case studies. Then each chapter focuses on a phase of field life: exploration appraisal, development planning, and production optimization. The last chapter explores emerging technologies.
