Prediction of volumetric sand production and wellbore. Therefore, it is significant to strengthen the research of the evolution rule for well drilling and casing protection. A wellbore stability model for formations with anisotropic. These soil models are incorporated in the commercial finite element program abaqus tm through user material subroutines hashash, 1992. Dassault systemes 2011, abaqus user manual version 6. Geostress evolution in the process of oil field development can directly influence wellbore stability. Pge 334 reservoir geomechanics recommended for you. Highlights developed is a wellbore stability model in which anisotropic strength and two shear failure modes are considered.
Wellbore stability in geomechanics nottingham eprints. Comprehensive wellbore stability analysis utilizing. Wellbore stress example, reservoir geomechanics youtube. Ensuring wellbore stability with geomechanics and pore. The finite element code abaqus is applied to analyse the mechanical behaviour of wells with.
The 1dmem is the backbone of every geomechanical workflow for which it provides the stress field, pore pressure, and mechanical properties. Abaqus tutorial free download as powerpoint presentation. This is a basic introduction for structural fem modelling using the popular software abaqus. Buckling analysis for the longterm integrity evaluation. Hydraulic fracturing of shale is simulated using an extended finite element method xfem with an explicit user element in abaqus. The analyses predict critical mud pressure values necessary to maintain wellbore stability at different deviation angles and stress histories. Introducing optimized validated meshing system for. Wellbore instability can result in lost circulation figure 1a where tensile failure has occurred, and spalling andor hole closure. Scribd is the worlds largest social reading and publishing site. Abaqus so ware as the solver, in which di erent parts such as thermal, hydraulic, and mechanical modules can be called.
Mechanical responses of formation and wellbore induced by. In the uniaxial example, it is selfexplanatory that the plastic. Borehole instabilities can be encountered at any stage in the life of a well and they are the main cause of drilling difficulties, resulting in substantial expenditures, expensive loss of time, sometimes even in the loss of part of or even whole boreholes. The main aim of this research is to use new method and theory in geomechanics to conduct the stability analysis of wellbore. Comprehensive wellbore stability analysis utilizing quantitative risk assessment daniel moos1 pavel peska1 thomas finkbeiner1 mark zoback2 1geomechanics international, palo alto, ca 94303 2stanford university, stanford, ca 94305 abstract utilization of a comprehensive approach to wellbore stability requires knowledge of rock.
Pdf borehole stability analysis for underbalanced drilling. Introduction to wellbore stability analysis duration. An experimental and numerical modelling study on stability of. Ensuring wellbore stability with geomechanics and pore pressure prediction. Unfortunately, wellbore stability problems, such as unexpected low fracture gradient, are. We would like to show you a description here but the site wont allow us. This study is intended to initiate the first step towards helping oil operators to design an optimized pumping scheme as well as a wellbore completion strategy in terms of maximizing the oil production.
Guidelines for papers to be presented at the abaqus users. Geomechanics, wellbore stability, buckling, contact interface. Pdf finite element analysis for wellbore stability of transversely. Wellbore instability is a major problem in the oil and gas industry and has been. Pdf the goal of this paper is to present a best practice for deep water subsalt wellbore stability analysis. Wellbore instability in hard brittle shale is a critical topic related to the effective exploitation of shale gas resources. Prior to drilling, the mechanical stresses in the formation are less than the strength of the. Himmelberg, nevan christopher, numerical simulations for wellbore stability and integrity. Development and verification of the comprehensive model.
Mechanical responses of formation and wellbore induced by water injection for enhanced geothermal system. The analyses consider two different boundary conditions on seepage at the cavity. The failure wellbore pressure, borehole closure, plastic zone. The verification results show that ignoring the effect of mean effective stress on the parameters of hydrate formation aggravates the invasion of drilling fluid into the. Coupled thm modelling of wellbore stability with drilling.
Finite element modeling of the stability of single. Introduction to wellbore stability analysis youtube. Buckling analysis for the longterm integrity evaluation of a hydrocarbon well c. We use cookies to personalize content and ads, provide social media features and analyze site traffic, and we may share this data with our partners, as outlined by our cookie policy. Erosion of material sand production in an oil wellbore sand control application. Wellbore stability analysis acts an important role in the drilling design to avoid stuckpipe, lost circulation and. A generalized plane strain model is used in the calculation. This software applies the coupled fluid flow and rock deformation analyses in the studies of wellbore stability and drilling mud design. In this video the basics are covered including creating.
Safe mud weight also depends on their relative orientation. The investigation is based on finite element threedimensional modeling using the commercial software abaqus. Numerical simulations for wellbore stability and integrity. The effect of field coupling on pore pressure, stress redistribution, and temperature around a wellbore has been analyzed in detail. Abaqus tutorial rotation around a fixed axis normal mode.
Coupled thm modelling of wellbore stability with drilling unloading, fluid flow, and thermal effects considered shanpojia,1,2 caoxuanwen,3 fuchengdeng,3. Numerical simulation of geostress and pore pressure. Pbore3d is a userfriendly software that analyzes and simulates the timedependent effects on wellbore stability while drilling. While managing the mud weight in the wellbore to solve the above issues, there should not be a significant weight reduction otherwise there will be instability at the wellbore above and below the depleted reservoir with the possibility of losing the well. Numerical wellbore stability numerical wellbore stability traditionally, the wellbore stability is performed based on analytical solution to calculate the stress state around the wellbore.
The hm coupling module and thermal module in abaqus software is used to. Marcellus and utica point pleasant, pittsburgh, pennsylvania, june 1719, 2014 datapages. This solution is valid when it is assumed the assumptions of plane strain condition and material with behavior. Wellbore stability analysis using strain hardening andor softening plasticity models article in international journal of rock mechanics and mining sciences 93.
The techlog wellbore stability module comprises mechanical earth model 1dmem building, wellbore stability, sand management, and fracture stability computation. Part three studies the effects of consolidation on longterm wellbore stability. Rock compaction on a hydrocarbon well completion using contact interfaces with abaqus g. Creating and analyzing a simple model the following section leads you through the abaqus cae modeling process by visiting each of the modules and showing you the basic steps to create and analyze a simple model. Pdf numerical analysis on subsalt wellbore stability in. Benefits improve stability of offshore structures 14 sand control application. Wellbore instabilities are responsible for 1020% of the total drilling cost. The development plan of a hydrocarbon field includes the design of all the productioninjection wells forecasted for the scenario considered. The finite element code abaqus is applied to analyse the mechanical behaviour of wells with different inclinations and different azimuths. Finite element method fem as a powerful tool for studying stress and strain status is being extensively employed in geotechnical studies. Special considerations for the marcellus shale julie kowan1,2 and see hong ong1. As a preliminary analysis perform free vibration analysis to obtain 30 vibration modes and their natural frequencies. Coupled thm modelling of wellbore stability with drilling unloading. The stability of single holes and multilateral junctions was analyzed at different orientations in a threedimensional insitu stress field.
Basic introduction to wellbore stability analysis designed and presented by sam saeed hashemi. Model actual wellbore geometry and coiled tubingdrill pipe include all nonlinearities, such as friction and contact collection of analysis techniques for. Wellbore stability in geomechanics connecting repositories. Nonlinear coupled consolidation analyses are performed to simulate the postdrilling, timedependent deformations and pore pressures around the wellbore. Then the wellbore stability is simulated with the proposed model by considering the drilling unloading, fluid flow, and thermal effects between the borehole and the formation. As the initial and boundary conditions, element type, and meshing system heavily affect the accuracy and precision of the results obtained from fem, in this research we present a novel approach which is optimized and validated by the results obtained from. Wellbore failure depends on the relative orientation between well paths and weak planes. Review and cite wellbore stability protocol, troubleshooting and other methodology information contact experts in wellbore stability to get answers.
Wellbore stability analysis using strain hardening andor. Generally an updip drilling is more stable than other drilling directions. Considering the interaction between reservoir seepage and stress fields, a mathematical model to characterize the stress evolution around wellbore was built. With the help of abaqus finite element software, the established comprehensive model was verified by the use of the wellbore stability numerical model of hydrate reservoir. A numerical investigation of wellbore stability problems using an. Donato milanese, mi, italy now politecnico di torino, italy. The solution method has been verified through a typical example of one dimensional thermal consolidation 20. Numerical analysis on subsalt wellbore stability in vioskaknoll, deepwater of.
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