What it does

METTE is a multi modus state of the art application for thermo hydraulic calculations, targeting the oil and gas industry. It covers cased hole logging, engineering calculations, forecasting and operational data processing.

The network simulator is an integrated optimization tool for seamless calculations from reservoir to topsides. It uses an in house developed equation solver. The solver is computation efficient, robust and with demonstrated capability. The simulator yields full mass, thermal and mechanical energy balances for the network while honoring defined system constraints.

The simulator is event based allowing runtime changes in network boundary conditions. Operational decisions are implemented using events, effectively modeling and computing field life development in a single simulation. Events include automatic and manual well openings, altering of well, line and network configurations, changes in internal and external boundary conditions with respect to phase flows, pressures, temperatures etc. and rerouting of wells and lines.

Using automated well opening METTE provides best estimates for well scheduling. The schedule can reflect lead time for wells, annual drill period and number of drill rigs available.

Pressure losses can be calculated with built in proprietary multiphase flow models. The module has built-in interfaces to the OLGA 2 and 3 phase point models. Other external models can be implemented that both for pressure loss and unit operations like pumping, compression, and valves.

Material balances include reservoir gas saturation water and mono ethylene glycol (MEG). Branches with multiple feed sources include fluid property averaging.

Multiple control elements can be defined in parallel and/or series reflecting relevant field equipment. Equipment types include valves, pumps, compressors, heaters and coolers.

The network can include multiple source nodes for gas lift and MEG injection. These source nodes can be used as interface elements to additional networks which are solved simultaneously with the production network. Material balances account for mass transfer of gas and MEG/water between the networks. The multiple network capability is useful for calculating field lifetime requirements of MEG and/or gas lift and power requirements.

The module includes dynamic pig and slip front tracing allowing the steady state solutions to reflect reduced pressure losses due to variations in liquid hold-up. This is especially useful in conjunction with long distance full well stream transfers.

Online interface to different reservoir simulators for coupled calculations with two-way communication to METTE is built-in. Experience indicate that METTE/reservoir simulator can reduce computation time with a factor of 2-6 compared with a reservoir simulator using VFP tables. Multiple reservoir simulation processes can be handled simultaneously with METTE acting as master. A large number of wells can be handled simultaneously with demonstrated capability at 100+ production wells.

The simulator can be run standalone (offline) based on input well phase flows and flowing bottom hole pressure predictions from a reservoir simulator or equivalent.

Simulation schematic