Application for Monitoring and Analysis of real-time drilling data PFAS from ITC a.s

Transcription

1 Application for Monitoring and Analysis of real-time drilling data PFAS from ITC a.s ITC a.s Stalsbergveien Tønsberg Phone: , web: Management note PFAS has been developed over the past 12 years in close partnership with Norsk Hydro. The scope has been to develop a PC based system that is simple to use and with an open architecture to enable monitoring and analysis of depth and time related data. The handling of time based data is the latest addition to the system. PFAS is used by several oil and service companies to plan and follow-up wells in relation to geological information (lithology, formation tops), petro-physical information (logs), geo-pressure data (pore pressure), geo-mechanical info (strength and stress, to get fracture and collapse info) and logging drilling information (events) to monitor pore pressure and well-bore stability. PFAS is also used by well-site geologists and other personnel. When real-time ECD is monitored simultaneously the drilling operation may be run close to zero integrity, which is the optimum drilling under extreme conditions. To get the full benefit of close to real-time analysis, it will be necessary to further develop derived local data for strength and stress info, such as the IKU correlations (strength in shale linked to lithology, depth and log values) and stress values based on the LOT data. The PFAS system may monitor any other type of depth and time related data as well, and more analysis modules may easily be included. The next step is to link PFAS up to a WITSML client, select the needed data, and thus enable close to real time analysis. The frequency of such analysis will depend on the severity of the drilling operation and availability of information. ITC has a wide range of highly qualified technological consultants covering most drilling and well related topics, together with our software development capability, we will be eager to take active part in the next step of PFAS development. Tønsberg, Svein Fagereng, Manager Director Sverre H. Bautz, Manager Software Development ITC a.s. Filename: invitation_witsml_tbd.doc Printed: Page - 1

2 PFAS, current status The main objective for PFAS today is: Before drilling: While drilling: After drilling: Make a Well Plan or geo-mechanical prognosis. This includes calculation of overburden, pore pressure, fracture and collapse and combine these data with the geological prognosis and ECD. Following up pore pressure, well bore stability and well integrity prognosis. Update lithology and lithostratigraphy (formation tops). Post analysis and experience transfer. General The figure below shows the main parts of PFAS. PFAS is an open system that can handle all types of depth related data. From the next version of PFAS, it will also be able to handle time based data. Calculations OB, PP, frac & collapse, stress, correlations Import/Export ASCII, LAS, Scripts PFAS Edit Logs, geology, depth data PFAS projects (data for one well) User Defined Calculations Any data Presentations Screen, file, printer WITSML Future implementation PFAS Plus only Shared database ITC a.s. Filename: invitation_witsml_tbd.doc Printed: Page - 2

3 Overview of PFAS functionality Import / Export: PFAS can import data from all types of ASCII text files including LAS files. Import of logs can be done manually or with the use of templates (user defined). In addition, in Saga Petroleum, a special script was made to read data directly from the Saga database system using Geo-share half-link. This may be one option to implement WITSML into PFAS. Export of data from PFAS is done through text files for use in other applications such as RMS. Edit You can edit all logs visually (click & drag) or as text. Lithology Lithostratigraphy Chronostratigraphy Text and symbols on presentations All kind of depth related information (optional with symbols) Calculations Overburden Pore pressure Stress Correlations for stress and strength d-exponent User Defined Calculations Presentations PFAS Data PFAS Plus This is the most powerful and flexible part of PFAS. In this module the user can insert her/his calculations and attach them to the PFAS menu system. Calculations can be performed using complex mathematics on multiple logs. Well information can be presented in up to 12 columns, and up to 8 different data types in each column. You can set up presentations manually or with the use of templates (user defined). Also cross-section plots with up to 15 wells can be made. Time Based Data: ITC will soon finish the functionality to handle time based data. The user will then have the possibility to mix depth based and time based data in presentations. Data in PFAS are stored into one database for each project (typically one well). PFAS uses database technology from Faircom CTree with data compression from PkWare. Today ITC have set a limitation of a maximum number of logs in one project to 200. Norsk Hydro does not have this extension to PFAS. This is a shared database system where all project data are stored. All PFAS users has easy access to all PFAS data and in addition there are a Quality Control system to monitor different revision of a well plan, quality control of logs and more. ITC a.s. Filename: invitation_witsml_tbd.doc Printed: Page - 3

4 Data used in PFAS The figure below shows all types of input data used in PFAS at Norsk Hydro. ITC a.s. Filename: invitation_witsml_tbd.doc Printed: Page - 4

5 Requirement of input data for a well plan Density log: Gammaray: Sonic or Resistivity Strength Stress size and direction Poisson Ratio Survey data LOT MDT Caliper Bulk density used to calculate overburden Used in correlations to establish strength Used to set shale base line in pore pressure calculations. Used to set formation tops. Used as bases for the pore pressure calculations. Used in correlations to establish strength. From correlations, used in fracture and collapse calculations. Used in fracture and collapse calculations. Used in fracture and collapse calc. Used in fracture and collapse calculations and in LOT inversion (stress) LOT tests from neighbour wells and current well. Pressure tests Used for stress calculations and break-out analysis. Gas data Bits and casing d-exponent Drilling data Used in the Well Plan presentation. Can be used in pore pressure calculations. Torque, drag, ROP Since PFAS is an open system with respect to data and calculations, the type of input data will be dependant on the use of the application. Time Based Data in PFAS So far, a lot of time based data has been collected, but there has been inadequate methodology for presentation, analysis and calculations. This is the background for implementation of time based data in PFAS. Time based data will be available in the next version of PFAS, to be issued in April In this version of PFAS you can import time based data in to a project and present the data just as time data, or as depth data together with other depth data, for example logs from the prognosis. You will also get the option to convert a time based log to a depth based log. You can now do any type of calculations using the new log. To be able to mix depth based and time based data, you need to select a depth reference log from the group of time data for example MD-hole or MD-bit. ITC a.s. Filename: invitation_witsml_tbd.doc Printed: Page - 5

6 Conclusion WITSML ITC will implement WITSML as an option in PFAS, when economics and partners for such a project is in place. As for real-time monitoring, it will be no need to store all data in PFAS, PFAS can use a memory window to the data obtained from WITSML. Monitoring and analysis of real-time drilling data PFAS can handle large amount of data and any type of logs can be used depth based or time based. New calculations based on logs are easy and straight forward to implement. A natural part of this expansion will be a real-time updating, with user defined intervals, of logs and trend lines in the current working window for example in pore pressure calculations. In this way, also automatic recalculations over a fixed selection of logs is possible. PFAS is therefore well suited to use as a front-end / analysing tool for real-time drilling data. ITC a.s. Filename: invitation_witsml_tbd.doc Printed: Page - 6