Measurement of well production: units based on multiphase flow meters and separation-type units. Stationary and mobile design.
The metering units are designed to measure the mass flow rate and mass of crude oil, the volumetric flow rate and volume of associated petroleum gas reduced to standard conditions, and the mass flow rate and mass of separated oil excluding water, produced from wells (a group of wells), as well as to display, archive and transmit measurement results and alarm signals to the oilfield dispatch centre for field surface facilities or to an engineering station (for a mobile metering unit).
Metering units based on multiphase flow meters are manufactured to TU 28.99.39-011-88090790-2023 and can be either stationary or mobile.
Separation-type metering units are manufactured to TU 28.99.39-011-88090790-2023
Both types of metering units can be of mobile (based on a trailer or self-propelled chassis) or stationary design.
The choice of the metering unit modification is based on the Customer's needs, taking into account the operational specifics of the facility or well (group of wells) and the possible advantages of a particular type of unit.
Using a mobile separation-free metering unit as an example.
| Measured parameters | Value |
|---|---|
| Flow meter installation method | Vertical with upward flow |
| Measured medium | Oil / water / gas |
| Nominal diameter | From 50.8 mm to 203.2 mm (from 2" to 8") |
| Size/internal diameter | 4/50, 4/67, 6/87, 8/132, 10/173 in/mm |
| Gas volume fraction in the flow (GVF) | from 0 to 100% |
| Viscosity of the measured medium | Any |
| Density of the measured medium | Not more than 1,200 kg/m³ |
| Maximum pressure in the pipeline | Not more than 34.5 MPa |
| Temperature of the measured medium | From -20 to +130 ºC |
| Communication interface | RS-232/RS-485/Ethernet |
| Data exchange protocol | Modbus ASCII/RTU/TCP |
| Permissible relative error of measurements of the mass and mass flow rate of crude oil at a gas volume fraction of 0% to 90% | Not more than 2.5% |
| Permissible relative error of measurements of the mass and mass flow rate of crude oil excluding water | Value |
|---|---|
| At a water volume fraction in crude oil not exceeding 70% | Not more than 6% |
| At a water volume fraction in crude oil from 70% to 95% | Not more than 15% |
| Permissible relative error of measurements of the volume of associated petroleum gas reduced to standard conditions at a gas volume fraction from 25% to 100% | Not more than 5% |
Using a mobile separation-free metering unit as an example. As standard, the unit consists of a process skid and an instrumentation skid.
The process skid is designed to house the measuring instruments and process equipment included in the unit and to provide conditions for their normal operation. For example, the skid can be made as an insulated enclosure, inside which the following are installed:
The instrumentation room is designed as an insulated enclosure housing:
An electric heater is installed to maintain the required positive temperature in the room. If required, a diesel generator set with a fuel storage tank can be optionally installed.
* The flow computer is a computing unit for fast execution of all flow parameter calculation algorithms. It communicates with all internal measuring instruments and interacts with the flow meter maintenance software and customer systems. This minimizes the number of metrologically significant elements of the unit, eliminating the need for additional computing units and controllers.
Key advantages and capabilities of metering units based on multiphase flow meters:
The separation metering unit consists of a process skid and a control and management unit and includes a set of installation and spare parts, a set of life support equipment, tools and accessories.
The process skid of the separation metering unit is designed to separate the production of an oil well into liquid and gas phases, measure the flow rate and quantity of each phase, control the operating mode of the separation vessel (SV) and operate the shut-off and control valves, to ensure normal operating conditions for the process equipment, measuring instruments and life support system installed in it.
The metering unit (Type C) includes:
Mobile metering units on different chassis and with different flow meters — swipe the slides.
We will select the unit type for your flow rate and site conditions and send a quotation.
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