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Southern North Sea Well Database

Introduction

A UK southern North Sea Well database for 600+ wells across UK quads 36-39, 41-44, 47-49 and 53-54. For each of the wells, all relevant data is worked up in single-well pressure vs. depth, and mudweight vs. depth cross-plots.

Data includes:

  • Formation tops
  • Wireline logs (GR, Lithology, Resistivity, Density, Sonic)
  • All pressure data (WFTs, DSTs, LOTs, FITS, Kicks, Lost Circulations)
  • Mudweights
  • Casing depths
  • Deviation surveys
  • Temperature
  • Check-shots/time-depth pairs
  • Drilling gas (connection, background and total gas etc.)
Benefits
  • Analysis of shales – understanding of shale lithofacies and its variation is key to safe well planning and real-time drilling in particular bore hole stability (BHS).
  • Interpretations of pressure data e.g. free-water levels, gradients and contacts
  • Interpretations of kicks for mapping purposes – influxes in the Zechstein are the biggest drilling issue in the SNS, and understanding local kick instances and overpressure magnitudes is key to safe drilling of exploration wells and plugging/decommissioning existing boreholes
  • Well pressure interpretation – detailed pressure analysis of any of the wells include local calibration and interpretation of the hydrostatic pressure, overburden pressure, pore pressure and fracture pressure
  • Understanding of pore and fracture pressures in drilled wells allows a more confident well plan to be produced in advance of drilling new wells
  • A full well interpretation also provides a full rock column pressure profile such that porous intervals with potential for flow and non-porous zones can be understood for decommissioning to meet new legislation
  • Single-consistent and QC’d well database
Deliverables
  • A .roc file of all 600+ wells
  • A comprehesive Atlas including:
    • Description of workflow
    • Single well pressure vs. depth and mudweight vs. depth cross-plots for all wells
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