Elfen fm case study predicting the paleo evolution of overpressured geological structures the project. 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. Predrill prediction of formation pore pressure from surface seismic survey is very important for drilling, production, and reservoir engineering because it affects drilling operations and wellplanning processes. Jun 14, 2017 predrill prediction of formation pore pressure from surface seismic survey is very important for drilling, production, and reservoir engineering because it affects drilling operations and wellplanning processes. Techlog pore pressure prediction schlumberger software. Modern modeling technologies for petroleum systems provide a complementary approach to traditional methods of pressure prediction. Calculate dexponent to predict pore pressure trends. Geomechanics and pore pressure prediction paradigm ltd. 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. Overbuden stress computation integrating synthetic and measured density using the extrapolation, amoco, miller, and traugott. Velocity determination for pore pressure prediction. Pore pressure prediction has been a vital concern to the oil and gas industry for many decades. Interactively predict overburden, pore, and fracture pressures.
On the other hand pore pressure prediction from well logs is accurate at a particular point only, but they are spatially limited. The main objectives of this study are to develop a new method to predict pore pressure and safe well design on the top of tulamura anticline in terms of pore pressure. The conventional approach is to use the normally pressured shale section to derive this nct, then apply it to the overpressured shale section to determine the pore pressure. Analytical interpretation of field data was used to predict pore pressure and fracture pressure for the formation.
Calculate dexponent to predict pore pressure trends excel. Deepwaterpro hxrs inhouse developed deepwaterrpro pore pressure prediction software uses the unique method of integrating multiple seismicsonic velocity stacks, offset lwd data, or clientprovided ppfg data, to predict pore pressure along a 3d wellpath by constructing and utilizing a pseudopressure curve that is trajectorydependant. During drilling, realtime data as outlined in this chapter are then used to detect and assure all see pressure interpretation benefits can result. Ut geofluids produces innovative concepts and analysis workflows that couple geologic loading and fluid flow to predict pore pressure and stress in the subsurface. The relation between net stress and reservoir pore pressure can be defined as see for instance christensen and wang, 1985. Pore pressure prediction is the ability to create numerical formulas that mimic the subsurface. Fuyong yan and dehua han, rock physics lab, university of houston.
The actual presence of higher pore pressure can lead to sweet spot preservation and even natural fracturing that can enhance production without the need for artificial stimulation. Predict pore pressure accurately in hpht well to prevent lost time incidents. The petrophysical data were evaluated using ikons science rokdoc software. Therefore, accurate comparison of the alternatives is with respect to this value. Methodology used to derive the overburden gradient key parameter of terzaghi equation different techniques can be used according to well data available. Drillworks expert software is the industrys most comprehensive system for regional pore pressure and geomechanical analysis and modeling. Best practices, wider skills sets, and competencies all viewed as essential for. 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. Drillworks geomechanics software helps both engineering and geoscience domains. Rokdoc geopressure is the complete package for 1d to 3d pressure analysis and prediction. Pore pressure the pore pressure may also be referred to as formation pressure and is the fluid pressure within the pores of a soil or rock. A predrill estimate of formation pore pressure is a key requirement for successful exploration and drilling.
In addition to pore pressure prediction and modeling, the data can be easily. Integrated approach to pore pressure and fracture pressure. Rokdoc rt is software for realtime well monitoring and risk management. By bringing the two together secrets hiding in subsurface data can be revealed. Pore pressure, effective stress, elastic wave velocities, triaxial compression test, eatons. 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. Pore pressure estimation what can we learn from 4d. Optimizing the mud weight program and planned equivalent circulating density ecd was important to minimize wellbore instability in the 9 7. Permedia pore pressure software is a flexible set of tools for conducting pore pressure studies. Petrospec technologiess pore pressure analysis tools. The geolog logbased pore pressure prediction module provides tools for predicting pore and fracture pressure profiles in wells based on logging data.
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. Rt reduces this uncertainty as the well is drilled thus reducing the risk and the. 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. The level of sophistication has indeed improved but there are still variations in pore pressure predictions methods. The pore pressure cube aims to support a better visualization of the mechanisms of overpressure generation and to help in a safer and economic drilling of wells. Overburden stress can be easily obtained from bulk density logs, while effective stress can be correlated to well log data, such as resistivity, sonic travel timevelocity, bulk density and drilling parameters e. These limitations can be traceable to the following main factors. The pore pressure prediction module is utilised to estimate the effective stress. Pore pressure prediction a logbased pore pressure prediction module provides tools to predict pore and fracture pressure profiles in wells based on logging data. Pore pressure prediction reduce uncertainty in pore pressure estimations. Geomechanics and pore pressure prediction improve recovery and reduce exploitation costs. Sign up pore pressure prediction using seismic velocity and well log data. A new pore pressure prediction from compressional velocity and sonic transit time are proposed. Pore pressure prediction geopressure analysis software.
One example of analysis using a trend line is the equivalent depth method illustrated in fig. 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 programming feature. Research highlights pore pressure prediction methods are modified using depthdependent normal compaction equations. Geologic pore pressure prediction an application of petroleum system modeling. Eatons equation eatons method equations for ppp are described in figure 3, and can be made from either velocity slowness or resistivity measurements, in.
Predrill pore pressure prediction using seismic velocities. An overview of pore pressure prediction using seismically. Pore pressure prediction and interpretation starts in the planning stage, with offset well information and seismic data used to develop predrill pressure estimates. Velocity determination for pore pressure prediction satinder chopraand alan huffman arcis corporation,calgary,alberta,canada. Ee log obg pres tvd obg nhg logval o val n input values needed for the calculations are. Subsequent analysis showed the realtime predicted pore pressures to be in excellent agreement with the measured formation pressures. A theoretical pore pressure model is proposed based on effective stressporositycompaction theory. This course demonstrates how to run your own pore pressure prediction and analyses, based on a geoscientific foundation, rather than software design. Following data preparation and compaction trend analysis, the geolog pore pressure prediction module calculates hydrostatic pressure, overburden pressure, pore pressure, and fracture pressure, in a single multitab program. More information on our geomochanics analysis software is available from downunder geosolutions. During the exploration phase, a prediction of pore pressure can be used t. Eatons equation is the most popularly used model for pore pressure prediction, but it is based on oversimplified stress velocity relation. New technology enables subsalt geopressure analysis to improve the accuracy of pore pressure prediction in challenging wells drilled near and below salt.
Velocity determination for pore pressure prediction cseg. To optimize drilling decisions and well planning in abnormal pressured areas, it is essential to carry out pore pressure predictions before. Pore pressure prediction from well logs and seismic data. Understanding pore pressure offshore engineer magazine.
Pore pressure estimation is important for both exploration and drilling projects. The pore pressure predicted graph can be used as a reference in the deep panuke formation for future well drillings. Pore pressure calculation methods dug insight user manual. The basic concepts used in pore pressure prediction will be presented, and methods for estimating pore pressure using log and seismic data will be explained and discussed. When this velocity profile is used to predict pore pressure, the lowvelocity coals cause an anomalously high pressure estimate that is false. 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. Methods to determine pore pressure equivalent depth methods. Each option can be used individually, or in conjunction with pore pressure integration, an easytouse tool for combining pressure data from multiple sources. Monitor your drilling window in realtime with live pore pressure and fracture gradient charts. In this situation, the seismic velocity field is too coarsely sampled in time to see the coals as separate layers as shown in the dashed velocity profile. Without a proper input of the pore pressure an adjusted prediction becomes impossible to obtain for any geomechanical model.
Geopressure or pore pressure prediction is of central importance in both the exploration and development of hydrocarbon reservoirs. Predictive modeling before drilling defining the four zones before drilling compressional seismic velocity v p is the first petrophysical property that can be used to predict the depth to the previouslymentioned four zones. As deeper and more complex geology is drilled, the technical difficulties in predicting and safely drilling through overpressures have become more. In submitted for presentation at the seg 2003 annual meeting. 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. This excel spreadsheet calculates the dexponent, a parameter used by drilling engineers to investigate ppore pressure trends when drilling into overpressurized zones. 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 a comprehensive. Pore pressure and fracture gradient easy mapping of trendlines to offset wells. Geologic pore pressure prediction an application of petroleum system modeling technology duration. 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.
Indepth 3d velocity model left and pore pressure prediction right in equivalent mud weight using the seismic velocities for the 50mi2 area. Pdf issues faced while calculating overburden gradient. Old vs new during conventional drilling, we predict pore pressure values using the available common correlations in the industry, ameen said. The package includes all the features of the drillworks standard and pro packages, and advanced tools for regional pore pressure analysis and modeling. Following data preparation and compaction trend analysis, the geolog pore pressure prediction module calculates hydrostatic pressure, overburden pressure, pore pressure, and fracture. Rock physics driven pore pressure software ikon science. Shale lithology in niger delta is massive and characterized by high pore pressure. Isolate shale sections and define your nct to calculate ppfg. If it is not properly evaluated, it can lead to numerous drilling problems such as dangerous well kicks, lost circulation, blowouts, stuck pipe, excessive costs, and borehole. Use of reflection tomography to predict pore pressure in overpressured reservoir sands.
Applications are presented in deepwater and subsalt wells to improve pore pressure. Pore pressure prediction is required in order to carry out safe drilling and well completion job. The pore pressure prediction module adds a complete workflow for interactive geopressure analysis, including prediction at wells and full 3d pressure models. The pore pressure predicted graph can be used as a reference in the deep panuke formation for. However, a number of different compaction trends can be. Accurate pore pressure prediction is the foundation of every well design. 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. Display of calibration data from drilling or other techlog wellbore software platform tools such as the techlog formation pressure module. Software dynaview advanced tool for realtime monitoring. Predrill pore pressure accurate prediction allows the appropriate mud weight to be selected and allows the casing program to be optimized, thus enabling safety by preventing wellbore collapse and economic drilling by reducing the cost. Fusion petroleum technologies,houston,usa summary knowledge of formation pore pressure is not only essential for safe and costeffective drilling of wells, but is also critical.
Most petroleum provinces exhibit overpressures, and as the industry explores for deeper targets, encountering high overpressures is becoming more common. Pore pressure prediction using seismic velocity modeling. Issues faced while calculating overburden gradient and picking shale zones to predict pore pressure conference paper pdf available march 2017 with 1,144 reads how we measure reads. Drillworks standard software puts pore pressure data and analysis tools at. This course introduces the attendee to the basics of the geopressure calculator gpc and fracture pressure calculator fpc modules within rokdoc. The ability to predict the physical formation of geological structures provides significant benefit in understanding the evolution of stress and pore pressure distribution within a field and, in particular, the material state of the reservoir units. Pore pressure is the pressure of fluids in the pores of a rock formation.
Develop effective stress relationships with confidence to quantify pore pressures. The eaton exponent, used for the computation of the pore pressure can be determined using a single relation. Pore pressure prediction and modeling using seismic velocities. But if the formation contains sand below the surface, then the drilling rate may increases with drilling depth.
Schlumberger works with seam to improve predrill pore. Accurate pore pressure prediction in hpht well reduces risk. To predict pore pressure, certain techniques and correlations are employed. Using traditional methods to predict pore pressure in. Pore pressure prediction, gom multidisciplinary pore pressure prediction solution integrates basin simulation outputs from petromod software to mitigate drilling risks in gom and other salt basins schlumberger helped to define, implement, and improve the workflow as we worked from performing 2d simulations to 3d simulations. Normally, formation density increases with the drilling depth.
Elfen fm geomechanical forward modelling rockfield. Geologic pore pressure prediction an application of petroleum system modeling technology. 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 is notoriously difficult to predict and may vary significantly across a typical sedimentary basin. Pore pressure prediction is a method of forecasting by using data that provides information about upcoming events or risks beforehand. It is useful because it enables drilling to continue without any delays or incidents. Our goal is to provide you with the best pore pressure and stress characterization for your well and to also support you in realtime during drilling to ensure that you meet your well objective in terms of cost and safety by eliminating unscheduled drilling events related to pore pressure and borehole stability. Drillworks software helps both engineering and geoscience domains better understand the subsurface environment and avoid costly delays. Apr 05, 2017 petroleum reservoir pressure prediction. Drillworks geomechanics software landmark solutions. However, its prediction an essential step of any hydrocarbon exploration and exploitation program. Estimation of density using compaction law with depth.
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