Difference between revisions of "OR/19/034 Description of data"
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|Fellgett, M W, Kingdon, A, Fernie, A, Baker, G, Mehta, M, Henderson, A F. 2019. Oilfield in a box: The Hutton Field dataset. British Geological Survey Internal Report, OR/19/034.|
The dataset consists of 64 wells from blocks 211/27 and 211/28 and includes two exploration wells, five appraisal wells, and 57 development wells. Twelve of the development wells are marked as sidetracks. A full listing of all of the available data can be found in the spreadsheet: Filespace_Listing.xlsx
The well data is split into two categories, with information that relates to a specific well placed in the Well_data folder and data that relates to multiple wells placed in the Field_Data folder.
In addition to the well data, there is a 3D seismic survey which has had the header geometry edited to allow it to be read easily into Petrel.
The metadata for all of the wells including slot numbers and previous names can be found in the Well_Meta_Data folder.
Well meta data and naming conventions
Many of the wells in the Hutton Field are referred to by two separate identifiers, a WELLREGNO and a slot number. The WELLREGNO should be treated as the primary identifier, however, many of the platform wells (i.e. production wells)are also referred to by a slot number which appears in multiple documents such as: Hutton_production_data.xls and Hutton_water_injection_data.xls. For clarity, the slot number has been added to the file CDA_NHDA_HUTTON_WELLS_20_APR_2018.xlsx to allow for comparison across the dataset.
There was also a discrepancy between the WELLREGNO listed in 2014 and the current WELLREGNO from CDA for 30 wells in the field. All of the registration numbers have been updated to make them consistent with the current outputs from CDA (treated as the definitive reference). However, for clarity an index of old and new filenames is available in CDA_Renamed_wells.xlsx. For more information on naming conventions for UKCS wells see Hatwin (2016).
The data that relates to multiple wells has been split into five categories:
- Multi_Well_Reports — A list of well reports which make reference to multiple wells;
- Strat_Data — Contains stratigraphic and chronostratigraphic information for a subset of the wells in this dataset;
- Velocity_data — Digitised check shots from a subset of the wells in this dataset;
- Hutton_production_data.xls — Production data from the Hutton Field (wells are referred to by their slot names);
- Hutton_water_injection_data.xls — Water injection data from the Hutton Field (eells are referred to by their slot names).
Well data has been sorted by well and split into five categories:
- Comp_Log_Scan — A composite or final well log, or where this log is not available, a summary log such as lithology log or mud log. Where this is not provided, presume no such log was available.
- Deviation — PDFs and Digitised deviation surveys provided to BGS with the initial data deposit, which are not available for all wells. For a subset of wells there is a .las file containing the calculated well path using minimum curvature which has been resampled to 15 cm increments in the Wellpath folder. If deviation information is not contained in this folder it may be available in one of the well reports.
- Digital_Data — Digital wireline and checkshot information in digital formats including: .dlis, .lis, .las and .segy. For a subset of wells, a joined well log has been created for the high value curves and is available in the Joined_Well_Log folder.
- Log_Scans — Scanned copies of the original logs from the well which can include: wireline, mud, velocity and lithology, etc. logs. This information is compiled from CDA and the data deposited with BGS.
- Reports — A series of reports from the well which can include: drilling end of well reports, geological end of well reports, end of well reports, stratigraphic/geological/palaeontological reports etc.
There is likely to be significant duplication of files in the well data folder as data has been deposited with BGS multiple times with different file names. These have been left in the dataset to provide a maximal dataset containing all of the possible files. In addition to this, some reports that cover well construction information for multiple wells, usually motherbores and their sidetracks, are included in the Well_data folder. One example is the file KM038185.pdf which can be found in wells 211/28a-H18, 211/28a-H18Y and 211/28a-H18Z. A summary of the information available for each well is presented in Table 2.
- Hawtin, S. 2016. Basic Wellbore Validation. Oil & Gas Authority Limited. https://itportal.ogauthority.co.uk/web_files/gis/Documents/OGA_WellboreStandard_2016_005_7.pdf