| POSC Specifications Version 2.2 | Epicentre Logical Data Model |
The description of a measurement point within a wellbore with associated properties (pressure, temperature, rates etc.) does not seem to be entirely satisfactory. The only entity available is a temporary_completion that does not really represent the business concept carried by a measurement point. Shell EXPRO and SIEP came across the same problem and an extension to the model has been submitted. The extension requires the measurement_point entity to be linked to the spatial model (may be through a position_in wellbore) and to the relevant properties: pty_transient_pressure, pty_transient_temperature, pty_standard_volume_liquid_rate, pty_standard_volume_gas_rate. The depth information would still be carried by the pty_location_1D associated with the general_wellbore_point (position_in_wellbore). In general_wellbore_point: measurement_point (O, K: measurement_point) indicates a facility which is located by this wellbore position. In measurement_point: position_in_wellbore (O, V: set[0,?] position_in_wellbore) specifies the placement of a facility within a wellbore.
Add a new subtype of wellbore_component_facility for the concept of wellbore_measurement_point. It was added as a subtype of product_flow_network_unit. The relationship from well_test_measurement to measurement_point was moved (via add/delete) to the new entity wellbore_measurement_point since this new entity describes the target of the relationship more accurately.
Added objects:
wellbore_measurement_point (Entity)
wellbore_measurement_point.well_test_measurement (Attribute)
well_test_measurement.wellbore_measurement_point (Attribute)
Modify the diagrams to reflect the new entity and the moved relationship.
Modified objects:
POT2:_Well_Testing_Measurements (Diagram)
POV1:_PFNU_Business_Objects (Diagram)
WI2:_Wellbore_Position (Diagram)
Delete the attributes which represent the moved relationship. This effective represents a rename of the well_test_measurement attribute from measurement_point to wellbore_measurement_point.
Deleted objects:
measurement_point.well_test_measurement (Attribute)
well_test_measurement.measurement_point (Attribute)