Construct Mechanical Earth Model
Construct Mechanical Earth Model
The geomechanics study or a Mechanical Earth Models (MEMs) evaluate the wellbore stability, pore pressure and fracture gradient to determine the mud weight windows for safe and successful drill a well. The MEM integrated all available data, such as log data and drilling data, to characterize the rock properties (elastic properties, rock strength and friction), the in-situ stresses and the pore pressure prevailing in the field
The data required to construct the mechanical earth model are found in Table 1.
Item | Must have | Better to have | Nice to have | |
Field scale | Field layout | X | ||
Full field review report | X | |||
Reservoir | Reservoir pressure | X | ||
Overburden pressures | X | |||
Geology | Geological report | X | ||
Geological cross-section | X | |||
Image log interpretation report | X | |||
Formation tops | X | |||
Stratigraphic column | X | |||
Structural map | X | |||
Drilling | Daily drilling report | X | ||
Strip log / master log / mud logging data | X | |||
Deviation Survey | X | |||
Stress measurements (XLOT, LOT, MDT, RFT) | X | |||
Casing and cementing diagram | X | |||
Real-time drilling data (ECD, ROP, Hook load, Pump rate, Pump pressure, Torque) |
X | |||
Cavings, Cutting reports, pictures | X | |||
Log data | Sonic data (DTCO, DTSM) | X | ||
Image log data (FMI, FMS, SHDT, UBI, OBMI) | X | |||
Open hole logs (GR, NPHI, RHOB, CALI, Resistivity) | X | |||
LWD data (caliper, resistivity, Density images) | X | |||
Elan volumes (VCL, PHIE, PHIT) | X | |||
Core | Core data (mechanical properties, porosity, density, petrography) | X | ||
Core photos | X | |||
Seismic | Cross line section | X | ||
Compressional velocities along the well path | X | |||
Inline section | X |
Table 1 Data required for Geomechanics Model
Deliverables:
A single (1) PowerPoint presentation describing the method and results of the mechanical earth model will be provided in addition to an Excel file with the output for the 2-D MEM (specific to the well based on the finalized trajectory). The results of the model will include a TVD plot of the MEM for a vertical well, and a MD plot of the planned well which will both include: pore pressure, low, medium and high risk collapse gradient, minimum horizontal stress and breakdown gradient.
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