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. Using traditional methods to predict pore pressure in. The package includes all the features of the drillworks standard and pro packages, and advanced tools for regional pore pressure analysis and modeling. The pore pressure prediction module adds a complete workflow for interactive geopressure analysis, including prediction at wells and full 3d pressure models. Pdf issues faced while calculating overburden gradient. The pore pressure prediction module is utilised to estimate the effective stress. Best practices, wider skills sets, and competencies all viewed as essential for. 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. But if the formation contains sand below the surface, then the drilling rate may increases with drilling depth. Methods to determine pore pressure equivalent depth methods. Pore pressure estimation what can we learn from 4d.
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. Apr 05, 2017 petroleum reservoir pressure prediction. Calculate dexponent to predict pore pressure trends excel. Drillworks expert software is the industrys most comprehensive system for regional pore pressure and geomechanical analysis and modeling. 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.
The petrophysical data were evaluated using ikons science rokdoc software. The discussion will focus on deriving a calibrated pore pressure model from seismic velocities. Fuyong yan and dehua han, rock physics lab, university of houston. Ee log obg pres tvd obg nhg logval o val n input values needed for the calculations are. Pore pressure prediction using seismic velocity modeling. Geomechanics and pore pressure prediction paradigm ltd. 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. To predict pore pressure, certain techniques and correlations are employed. Nov 01, 2015 mpd, on the other hand, enables precise measurement of the pp with dynamic pore pressure testing dppt, which reduces the nonproductive time inherent in rft and dst without compromising safety. 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 pore pressure predicted graph can be used as a reference in the deep panuke formation for. 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. Indepth 3d velocity model left and pore pressure prediction right in equivalent mud weight using the seismic velocities for the 50mi2 area.
Analytical interpretation of field data was used to predict pore pressure and fracture pressure for the formation. Pore pressure is notoriously difficult to predict and may vary significantly across a typical sedimentary basin. 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. 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. An overview of pore pressure prediction using seismically. 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. Pore pressure prediction is the ability to create numerical formulas that mimic the subsurface. 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. Permedia pore pressure software is a flexible set of tools for conducting pore pressure studies. Geopressure or pore pressure prediction is of central importance in both the exploration and development of hydrocarbon reservoirs. 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. Software dynaview advanced tool for realtime monitoring.
A predrill estimate of formation pore pressure is a key requirement for successful exploration and drilling. New technology enables subsalt geopressure analysis to improve the accuracy of pore pressure prediction in challenging wells drilled near and below salt. Modern modeling technologies for petroleum systems provide a complementary approach to traditional methods of pressure prediction. These limitations can be traceable to the following main factors. Rt reduces this uncertainty as the well is drilled thus reducing the risk and the.
During drilling, realtime data as outlined in this chapter are then used to detect and assure all see pressure interpretation benefits can result. 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. 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. 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. The pore pressure predicted graph can be used as a reference in the deep panuke formation for future well drillings. Pore pressure and fracture gradient easy mapping of trendlines to offset wells. On the other hand pore pressure prediction from well logs is accurate at a particular point only, but they are spatially limited. Overbuden stress computation integrating synthetic and measured density using the extrapolation, amoco, miller, and traugott. Drillworks geomechanics software helps both engineering and geoscience domains. This excel spreadsheet calculates the dexponent, a parameter used by drilling engineers to investigate ppore pressure trends when drilling into overpressurized zones. 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. Elfen fm geomechanical forward modelling rockfield. Geologic pore pressure prediction an application of petroleum system modeling technology. Pore pressure prediction geopressure analysis software.
Ut geofluids produces innovative concepts and analysis workflows that couple geologic loading and fluid flow to predict pore pressure and stress in the subsurface. A new pore pressure prediction from compressional velocity and sonic transit time are proposed. Elfen fm case study predicting the paleo evolution of overpressured geological structures the project. In addition to pore pressure prediction and modeling, the data can be easily. Integrated approach to pore pressure and fracture pressure. Optimizing the mud weight program and planned equivalent circulating density ecd was important to minimize wellbore instability in the 9 7. In submitted for presentation at the seg 2003 annual meeting.
Therefore, accurate comparison of the alternatives is with respect to this value. Geologic pore pressure prediction an application of petroleum system modeling technology duration. Eatons equation eatons method equations for ppp are described in figure 3, and can be made from either velocity slowness or resistivity measurements, in. When this velocity profile is used to predict pore pressure, the lowvelocity coals cause an anomalously high pressure estimate that is false. 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. Isolate shale sections and define your nct to calculate ppfg. Drillworks standard software puts pore pressure data and analysis tools at. More information on our geomochanics analysis software is available from downunder geosolutions. 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. Shale lithology in niger delta is massive and characterized by high pore pressure. Predrill pore pressure prediction using seismic velocities. Rokdoc geopressure is the complete package for 1d to 3d pressure analysis and prediction. 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. Pore pressure prediction a logbased pore pressure prediction module provides tools to predict pore and fracture pressure profiles in wells based on logging data.
Rokdoc rt is software for realtime well monitoring and risk management. Minimizes uncertainty in the velocity analysis because pore pressure imaging is based on mapping seismic velocity to pore pressure, any uncertainty in the velocity model impacts both pore pressure prediction and the calibration of the pore pressure model. Pore pressure, effective stress, elastic wave velocities, triaxial compression test, eatons. A theoretical pore pressure model is proposed based on effective stressporositycompaction theory.
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. Monitor your drilling window in realtime with live pore pressure and fracture gradient charts. Calculate dexponent to predict pore pressure trends. However, its prediction an essential step of any hydrocarbon exploration and exploitation program. 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. This course demonstrates how to run your own pore pressure prediction and analyses, based on a geoscientific foundation, rather than software design. One example of analysis using a trend line is the equivalent depth method illustrated in fig. Velocity determination for pore pressure prediction. Drillworks geomechanics software landmark solutions. Applications are presented in deepwater and subsalt wells to improve pore pressure. Subsequent analysis showed the realtime predicted pore pressures to be in excellent agreement with the measured formation pressures.
By bringing the two together secrets hiding in subsurface data can be revealed. 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. 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. Velocity determination for pore pressure prediction cseg. 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. Each option can be used individually, or in conjunction with pore pressure integration, an easytouse tool for combining pressure data from multiple sources. Old vs new during conventional drilling, we predict pore pressure values using the available common correlations in the industry, ameen said. The geolog logbased pore pressure prediction module provides tools for predicting pore and fracture pressure profiles in wells based on logging data. Petrospec technologiess pore pressure analysis tools. Accurate pore pressure prediction is the foundation of every well design. 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. 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. Normally, formation density increases with the drilling depth. Estimation of density using compaction law with depth.
Sign up pore pressure prediction using seismic velocity and well log data. Accurate pore pressure prediction in hpht well reduces. The relation between net stress and reservoir pore pressure can be defined as see for instance christensen and wang, 1985. 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. Predict pore pressure accurately in hpht well to prevent lost time incidents. 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. Methodology used to derive the overburden gradient key parameter of terzaghi equation different techniques can be used according to well data available. During the exploration phase, a prediction of pore pressure can be used t. Pore pressure prediction reduce uncertainty in pore pressure estimations.
The level of sophistication has indeed improved but there are still variations in pore pressure predictions methods. Interactively predict overburden, pore, and fracture pressures. As deeper and more complex geology is drilled, the technical difficulties in predicting and safely drilling through overpressures have become more. Following data preparation and compaction trend analysis, the geolog pore pressure prediction module calculates hydrostatic pressure, overburden pressure, pore pressure, and fracture. 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. Display of calibration data from drilling or other techlog wellbore software platform tools such as the techlog formation pressure module. Pore pressure estimation is important for both exploration and drilling projects. 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. Use of reflection tomography to predict pore pressure in overpressured reservoir sands. Most petroleum provinces exhibit overpressures, and as the industry explores for deeper targets, encountering high overpressures is becoming more common. It is useful because it enables drilling to continue without any delays or incidents. Geomechanics and pore pressure prediction improve recovery and reduce exploitation costs.
Research highlights pore pressure prediction methods are modified using depthdependent normal compaction equations. How to predict formation pressure prior to drilling. Understanding pore pressure offshore engineer magazine. 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. To optimize drilling decisions and well planning in abnormal pressured areas, it is essential to carry out pore pressure predictions before. Pore pressure prediction has been a vital concern to the oil and gas industry for many decades. However, a number of different compaction trends can be. 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. 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. 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 calculation methods dug insight user manual.
Pore pressure prediction and interpretation starts in the planning stage, with offset well information and seismic data used to develop predrill pressure estimates. Without a proper input of the pore pressure an adjusted prediction becomes impossible to obtain for any geomechanical model. Rock physics driven pore pressure software ikon science. This course introduces the attendee to the basics of the geopressure calculator gpc and fracture pressure calculator fpc modules within rokdoc. Pore pressure prediction is required in order to carry out safe drilling and well completion job. Drillworks software helps both engineering and geoscience domains better understand the subsurface environment and avoid costly delays. Techlog pore pressure prediction schlumberger software. Develop effective stress relationships with confidence to quantify pore pressures. Analyze cause of drilling problems in area and create pore pressure and wellbore stability models. Accurate pore pressure prediction in hpht well reduces risk.
Geologic pore pressure prediction an application of petroleum system modeling. Pore pressure prediction and modeling using seismic velocities. Pore pressure is the pressure of fluids in the pores of a rock formation. Pore pressure prediction from well logs and seismic data. 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.
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