Pore pressure prediction has gradually became an integral part in the oil and gas industry as it provides the estimates for pore pressure in reservoirs or wells. When impermeable rocks such as shales form as sediments are compacted, their pore fluids cannot always escape and must then support the total overlying rock column, leading to anomalously high formation. Integrated approach to pore pressure and fracture pressure. Modern modeling technologies for petroleum systems provide a complementary. Mangaraj2, c summary the subject of detection of abnormally high pressured. If the pore pressure is predicted inaccurately, costly damage to the well or reservoir can occurresulting in npt and safety hazards. Calculate dexponent to predict pore pressure trends. Pressure pro dynamic pore pressure prediction software platform designed for predrill planning and real time monitoring of drilling operations, incorporating the algorithmic sophistication demanded by more challenging drilling environments and special procedures for extended reach drilling operations, mixed lithology pore pressure and fracture gradient environments and a user. Pore pressure prediction in unconventional resources. Feb 06, 2018 safer drilling log based pore and fracture pressure prediction and modelling of in situ stress duration. In order to ensure well stability and assess optimal orientation for fracture development, drilling professionals need to understand regional stress orientations and magnitudes, and how they affect rock properties in the formations around a wellbore. We include some of these definitions here for convenience.
P is the formation pore pressure psi p ob is the overburden pressure ft z is the vertical depth ft d is the d exponent. Pore pressure prediction using seismic velocity modeling. Improvement in pore pressure prediction resolution using cggs high densit y anisotropic velocity analysis advanced geostatistical techniques to derive rock properties and calibrate seismic and well velocities 3d gocad geomodelling technology for 3d. Geomechanics and pore pressure prediction paradigm ltd. One example of analysis using a trend line is the equivalent depth method illustrated in fig. Hxrs deepwaterpro pore pressure prediction software is developed to use the unique method of integrating multiple seismicsonic velocity stacks to predict pore pressure along the 3d wellpath and also take into account the effect of centroid, buoyancy and formation temperature. Drilling engineeing, geomechanics, pore pressure prediction. The subsurface pore pressure buildup partitions are. Techlog pore pressure prediction schlumberger software. Geologic pore pressure prediction an application of petroleum. Seismic pore pressure prediction volumes can be used to help with well engineering decisions such as trajectory and completion planning.
Software dynaview advanced tool for realtime monitoring. The pressure of the subsurface formation fluids, commonly expressed as the density of fluid required in the wellbore to balance that pore pressure. Pore pressure prediction from well logs and seismic data in this paper we describe the extensive pore pressure prediction ppp from three given wells namely well1, well2 and well3 and also from the 3d marine seismic data acquired over the same area in the arabian. A python package for pore pressure prediction using well log data and seismic velocity data. During the exploration phase, knowledge of the spatial distribution of formation pressures can be used to develop fluid migration models, to study the effectiveness of seals, and to rank. The use of porepressure prediction software on well1 reduced drilling uncertainty and prevented at least one kick, resulting in an estimated time saving of 1220 hours. Modern modeling technologies for petroleum systems provide a complementary approach to traditional methods of pressure prediction.
Because seismic velocities correlate with effective pressure in the formation, sufficiently precise estimates of velocity obtained from seismic observations can be used to determine pore pressure. The initial pressure prognosis of the objectives was based on seismic velocities, calibrated to the only available offset well, some 9. Pore pressure prediction in orthotropic medium based on. Pore pressure calculation methods dug insight user manual. Accurate pore pressure prediction in hpht well reduces risk.
Calibrate pp to credible information as it becomes available. Current commonly used methods of pore pressure prediction are based on the difference between a normal trend in sonic wave velocity, formation resistivity factor frf, or d. Rokdoc rt is software for realtime well monitoring and risk management. These pressure predictions can then be compared against pressures predicted by basinpt, pressure seeding or seismic velocitybased workflows.
The geolog logbased pore pressure prediction module provides tools to predict pore and fracture pressure profiles in wells based on logging data. Subsequent analysis showed the realtime predicted pore pressures to be in excellent agreement with the measured formation pressures. A predrill estimate of formation pore pressure is a key requirement for. This resulted in a more accurate understanding of significant 3d effects such as compaction history and pore pressure development coupled to threecomponent stress behavior through geological time in. A detailed description of pore pressure terminology can be found in bruce and bowers 2002, bowers 2002 and dutta 2002.
Eatons equation eatons method equations for ppp are described in figure 3, and can be made from either velocity slowness or resistivity measurements, in the well or from data volumes. To optimize drilling decisions and well planning in abnormal pressured areas, it is essential to carry out pore pressure predictions before. However, its prediction an essential step of any hydrocarbon exploration and. Isolate shale sections and define your nct to calculate ppfg. Theoretical pore pressureporosity model is the fundamental for pore pressure prediction in shales, where the compaction disequilibrium is the primary mechanism of overpressure generation. Sign up pore pressure prediction using seismic velocity and well log data. During the well planning stage, reservoir pore pressure influences everything from the casing design to the mud weight and type selection.
Addax petroleum chooses paradigm technology as its. Schlumberger works with seam to improve predrill pore. Display of calibration data from drilling or other techlog wellbore software platform tools such as the techlog formation pressure module. Improve predrill pore pressure prediction in gom and other salt basins. Geomechanics and pore pressure prediction improve recovery and reduce exploitation costs. Accurate pore pressure prediction is the foundation of every well design. Pore pressure estimation is important for both exploration and drilling projects. Current seismic approaches for pore pressure prediction mainly initially establish the relation between vertical effective stress and physical parameters velocity, resistivity or porosity, and then predict pore pressures with the known effective stress theory. Safer drilling log based pore and fracture pressure prediction and modelling of in situ stress duration. Pore pressure prediction allows for tighter pressure. Pore pressure prediction and modeling using seismic velocities.
Pdf pore pressure prediction in a carbonate reservoir. To optimize drilling decisions and well planning in abnormal pressured areas, it is essential to carry out pore. Petrospec technologiess pore pressure analysis tools. Drillworks software helps both engineering and geoscience domains better understand the subsurface environment and avoid costly delays. Powerful, accurate engineering and geomechanicspore pressure software is the key to successful well design, modeling and rigsite trend analysis. Mar 28, 2016 pore pressure is notoriously difficult to predict and may vary significantly across a typical sedimentary basin. Pore pressure is notoriously difficult to predict and may vary significantly across a typical sedimentary basin. Velocity determination for pore pressure prediction cseg. Experience from several unconventional plays highlights key aspects of pore pressure prediction work that are different from conventional exploration settings. The pressure of fluids within the pores of a reservoir, usually hydrostatic pressure, or the pressure exerted by a column of water from the formations depth to sea level.
Pore pressure prediction geopressure analysis software. The petromod software enabled classic pore pressure models to be paired with 3d stress models, principally for fracture gradient prediction. Calculate dexponent to predict pore pressure trends excel. Using datasets from the gulf of mexico the course introduces some of the basic concepts of overburden calculation, pore pressure prediction and fracture pressure calculation, but is not intended to be. The two major pore pressure prediction techniques employed are the eatons and bowers models while the eatons fracture pressure model and the hubbert and willis fracture pressure prediction models were utilized for fracture prediction. The solution applies both industry standard and proprietary technologies in a small footprint easy to use application to predict and analyze pore pressure before, during and after drilling. The most recent application of the pore pressure prediction software was the exploration well, well1, drilled from a drillship in a water depth in excess of 450 meters in the south china sea.
Hxr developsutilizes some of the most advanced erd and geomechanics software in the industry today. Pore pressure prediction can also be performed across large areas and used as a more qualitative exploration tool at a basin scale. Pore pressure prediction has been a vital concern to the oil and gas industry. A predrill estimate of formation pore pressure is a key requirement for successful exploration and drilling. The pore pressure prediction module is utilised to estimate the effective stress. Methods to determine pore pressure equivalent depth methods. Pore pressure prediction is critical to reducing drilling costs and exploring hydrocarbons. P p is the formation pore pressure psi p p z is the normal pore pressure gradient psi ft1.
Analyze and model pore pressure and geomechanics to anticipate problems, reduce uncertainty, and optimize wellbore design for safer and improved drilling performance. Pore pressure is the pressure of fluids in the pores of a rock formation. The eaton exponent, used for the computation of the pore pressure can be determined using a single relation. Pore pressure prediction is the ability to create numerical formulas that mimic the subsurface pressure profile. However, a number of different compaction trends can be. Hxrs deepwaterpro pore pressure prediction software is developed to use the unique method of integrating multiple seismicsonic velocity stacks to. One of our software products, pqube, is a suite of programs used for predicting and estimating abnormal pore pressure using 3d or 2d seismic velocity data. Accurate pore pressure prediction in hpht well reduces. The petrophysical data were evaluated using ikons science rokdoc software. Consequently, velocity determination is the key to pore pressure prediction. Pore pressure prediction has been a vital concern to the oil and gas industry for many decades.
More information on our geomochanics analysis software is available from downunder geosolutions. Pore pressure prediction from well logs and seismic data. It is the most comprehensive course using the simple models of geology, rockmechanics and hydrodynamics to predict and appraise subsurface geopressure and consequently evaluate your prospect. If predrill pore pressure prediction has big uncertainty, realtime pore pressure detection is needed to update predrill pore pressure prediction and advise drilling operations in realtime. A normal pressure gradient might require 9 lbmgalus 1. The estimates are either used by geologists or mud engineers for safety by identifying the potential drilling hazards. Pressure pro dynamic pore pressure prediction software platform designed for predrill planning and real time monitoring of drilling operations, incorporating the algorithmic sophistication demanded by more challenging drilling environments and special procedures for extended reach drilling operations, mixed lithology pore pressure and fracture gradient. Understanding pore pressure prediction in unconventional plays is important for executing a safe drilling strategy and for accurate production modeling. This course demonstrates how to run your own pore pressure prediction and analyses, based on a geoscientific foundation, rather than software design. Pore pressure analysis mainly includes three aspects, that is, predrill pore pressure prediction, realtime pore pressure detection, and postwell analysis. Most petroleum provinces exhibit overpressures, and as the industry explores for deeper targets, encountering high overpressures is becoming more common. Pore pressure prediction allows for tighter pressure gradient.
The use of pore pressure prediction software on well1 reduced drilling uncertainty and prevented at least one kick, resulting in an estimated time saving of 1220 hours. Optimizing the mud weight program and planned equivalent circulating density ecd was important to minimize wellbore instability in the 9 7. The pore pressure prediction module adds a complete workflow for interactive geopressure analysis, including prediction at wells and full 3d pressure models. Pore pressure prediction reduce uncertainty in pore pressure estimations. Indepth 3d velocity model left and pore pressure prediction right in equivalent mud weight using the seismic velocities for the 50mi2 area. Geologic pore pressure prediction an application of. These large volumes provide an overview of pressure and fluid behavior within the basin and can be used to identify important features, such as. However, without establishing the geological groundwork for these mathematical equations, results can be misleading.
Pore fluid pressure affects the physical properties of reservoir rocks, hence predicted pressure is a key input when building the geomechanical model of a reservoir. Pore pressure prediction is required in order to carry out safe drilling and well completion job. Pore pressure prediction methods using techlog a predrill estimate of formation pore pressure is a key requirement for successful exploration and drilling. This method first assumes that there is a depth section over which the pore pressure is hydrostatic, and the sediments are normally compacted because of the systematic increase in effective stress with depth. Ee log obg pres tvd obg nhg logval o val n input values needed for the calculations are. Therefore, accurate comparison of the alternatives is with respect to this value. However, its prediction an essential step of any hydrocarbon exploration and exploitation program.
This course introduces the attendee to the basics of the geopressure calculator gpc and fracture pressure calculator fpc modules within rokdoc. The use of porepressure prediction software on well1 reduced drilling uncertainty and prevented at least one kick, resulting in. During the exploration phase, a prediction of pore pressure can be used to evaluate exploration risk factors including the migration of formation fluids and seal integrity. Geopressure or pore pressure prediction is of central importance in both the exploration and development of hydrocarbon reservoirs. Using this theoretical model, pore pressure prediction from porosity and compressional velocity sonic transit time have been obtained. A quantitative predrill prediction of pore pressure is required when drilling in. Geologic pore pressure prediction an application of petroleum system modeling technology. Monitor your drilling window in realtime with live pore pressure and fracture gradient charts. Pore pressure prediction is used to develop a 3d model for the pressure regime and it is a critical property towards an effective reservoir simulation and management. A quantitative predrill prediction of pore pressure is required when drilling in overpressured formations, and can be obtained.
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