Jesco Multiphase Metering Systems
The upstream oil and gas industry deals with some of the most challenging metering applications. Virtually every well produces a multiphase mixture that includes oil, water, natural gas and, in some cases, solids such as sand, wax, etc. The conventional process utilized to determine the flowrates of the individual phases was simple; use a large gravity-based separator to segregate the phases and then measure the individual flowrates of oil, natural gas and water using conventional, single-phase meters. In recent years, a number of forces have emerged to drive the development of a higher-technology approach, geared toward multiphase measurement.
Jesco Multiphase Metering Systems are compact continuous cyclonic separators with Coriolis metering for gas and liquid, and a built-in float liquid level controller. The principle of operation is based on creating a cyclonic flow pattern in the vertical piping to separate the gas from the liquid. Additional secondary separation occurs in horizontal section of separator. Although this concept and its advantages have been known for some years, recent advances in technology have brought continuous cyclonic separators to the forefront in multiphase metering and oil and gas process facilities design.
The major advantage of Jesco Multiphase Metering System is that it utilizes conventional Coriolis metering equipment, with a proven water-cut determination in the transmitter with Advance Phase Measurement Software (APM), to produce a reliable 3-phase metering data. With liquid and gas Coriolis flow meters, the system provides exceptional 2-phase separation and accurate metering of the liquid (oil and water) and gas streams. These streams can then be recombined, or kept separate and sent to other process components downstream. Also the multiphase meters are built to ANSI B31.3 piping code, which can eliminate the need for a pressure safety valve, or they can be built as an ASME section VIII vessel depending on customer requirements.
The oil and gas industry has found a broad range of advantages in multiphase meter developments, ranging from reduced capital costs and access to remote locations, to the reduction of environmental impacts from oil and gas operations. One of the key industry drivers is the need for a continuous data stream, to improve monitoring, production optimization and forecasting capabilities.
Today, the primary use of multiphase measurement technology is for production testing, performed periodically to determine individual well production performance. In facilities servicing a number of wells, the combined production flows into a primary separator, while one well at a time is routed to the test separator.
Replacement of conventional test separator by a multiphase metering system has a number of distinct advantages. First, use of a multiphase metering system saves space and weight, a critical concern for offshore operations. Second, the stabilization time required to obtain a good test is greatly reduced. Conventional test separators require long residence times to achieve separation of the phases and must be purged for an appropriate period of time prior to starting the next testing cycle.
Advantages of the system
- Low cost, compared with In-line Multiphase meters and Conventional Separators
- Compact and very portable
- Low maintenance
- Low power consumption
- Reduced net oil, water and gas measurement uncertainty
- Real-time data for continuous mode monitoring
- Low pressure drop
- ability to handle a variety of slugging conditions
- Lower Initial and Operating Cost
- Continuous Mode Monitoring
- Well Optimization with real-time Data
- Dynamically Controlled Systems
- Advanced Diagnostics and Operations
- Multi Well Testing
- Individual Well Head Monitoring
- Production Field Monitoring
Specifications for the Design
These systems are a function of flow rate ranges and operating conditions. Typical systems are from ANSI 150 to 600, 100 - 20,000 BPD, and up to 10,000,000 SCFD (@ 50 psig). The normal turndown for this equipment is a 100:1, but higher capacity and higher rated system can easily be designed as long as conventional instrumentation is available.
The Multiphase Metering System is an engineered product to the specific customer requirements. The following is a general description of the system specifications.
|Inlet & Outlet Pipe dimension||2 – 8 inch Available|
|Materials||Carbon or 316L Stainless Steel Typical, Skid is White|
|Wetted parts||Carbon or 316L Stainless Steel, Restricted to Instrument specifications|
|Pressure range||0 to 149 bar|
|Flowing Temperature range||0 to +204oC, Restricted to Instrument specifications|
|Instrument Temperature||0 to +55oC ambient, Optional Heaters Available|
|Installation||Skid mounted in vertical pipe|
|Power suppl||230 VAC 50/60 Hz or 24 VDC|
|Power consumption||12 W|
|Pressure drop||Typically <0.2 bar (3 psi)|
|Weight and size||Dependent of design flow rates.|Performance
|Measuring Range|| |
|Water Cut||0 to 100%|
|GVF at operating conditions||0 to 100% GVF: (Gas Void Fraction)|
| || |
|Individual flow meters|| |
|Gas flow meter||Coriolis, Vortex|
|Liquid flow meter||Coriolis|
|Water Cut Determination||Micro Motion APM |
|Typical overall uncertainties|| |
|Liquid flow rate||Relative error of +/- 2 %|
|Gas flow rate||Relative error of +/- 3%|
|Water Cut||Absolute error of +/- 3 %, according to application|
|Typical Accuracy Requirements|
5 to 10% for reservoir management,
2 to 5% for production allocation, and
0.25 to 1% for fiscal metering
we are gald to announce the release of our new Multiphse metering system