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 monitoring module in METTE calculates phase flow rates from multiple boundary conditions. Boundary condition data originate from stationary sensors located along the branch trajectory. Applicable measurements can be pressure, temperature, force, density, fluid velocity, phase fractions or flows etc. As such it can be regarded as a distributed multi phase meter.

The monitoring application is designed for stand alone calculation of phase flows. It is also ideally suited for working in tandem with multi phase meters as it is capable of exploiting any or all measurements or results originating from these.

The system is cost effective as a single application can serve a large number of wells extracting flow information from sensors which are part of field design.

The module can be employed offline for post processing of data or online against an external data source. If required we will build the interface module to communicate with your data source.

We take advantage of our network capability to utilize commingled flow information to resolve the in situ phase fluxes. In practical life this means we can utilize information from fiscal meters or multi phase meters mounted on lines carrying production from several wells.

In order to enable this type of application it is a requirement to have a calculation start point in a well or line which defines initial fluid phase properties in the form of known pressure and temperature. In addition a minimum of one sensor type must be available per phase to be calculated. For an under saturated oil system where the gas oil ratio can be fixed to a known value, two sensor measurements are required - one for oil and one for water, with the gas rate given by calculated oil and GOR.

All available sensor signals used for calculation of phase flows work in unison via a single response function which can be formulated as

where the summation is over i sensors, Y is a sensor response, subscripts M and C indicates measured and calculated sensor responses while w is an optional weight factor allowing different sensors to contribute differently to the response function.

The calculation process itself is iterative in nature and employs a fast and robust search algorithm. The algorithm varies the phase fluxes in order to minimize the difference between measured and calculated sensor responses to find a minimum in the response function. The phase fluxes associated with this minimum are taken to be the in situ flows.

An extension is open or closed loop control of production wells to achieve predefined target production rates. The module calculates set points for production valves in order to meet defined targets satisfying defined system constraints employing the powerful network solver.

Search process schematic