API MPMS 20.3
Manual of Petroleum Measurement Standards Chapter 20.3 Measurement of Multiphase Flow
|Publication Date:||1 January 2013|
This standard addresses multiphase flow measurement in the production environment, upstream of the custody transfer (single-phase) measurement point, where allocation measurement for onshore, offshore, or subsea is applied. For other multiphase flow measurement applications such as reservoir management, well tests, and flow assurance, the standard can be used as a reference or guide. However, the focus of this standard is on those applications where the accuracy of multiphase flow measurement for allocation systems is required.
This document refers to existing standards and recommended practices to supplement the guidance it provides in this subject area. The document addresses principles used in multiphase flow measurement, multiphase metering types and classifications, assessment of expected performance, and selecting and operating multiphase measurement systems. Operational requirements or constraints are addressed, including expectations for flow meter acceptance, calibration criteria, flow loop and in situ verifications, and other guidance specific to different multiphase flow metering applications. The document does not address specific meter configurations.
This standard provides guidance on multiphase flow measurement taken upstream of the custody transfer point. The standard is intended for the application of production allocation measurement where... View More
This standard provides guidance on multiphase flow measurement taken upstream of the custody transfer point. The standard is intended for the application of production allocation measurement where required by commercial contracts. While this document is not aimed specifically for use in reservoir management or other operational needs, it can be used for this purpose.
This standard addresses in depth the question of how the user measures (multiphase) flow rates of oil, gas, water, and any other fluids that are present in the production stream.
In this standard, the measurement of multiphase flow addresses all possible flow conditions that can be encountered in the production of oil and gas-i.e. there are no conditions specifically excluded here that are found in typical hydrocarbon production.
NOTE 1 As a common practice and essentially as the vernacular within the industry, multiphase flow is referred to as "three phase," and throughout this document multiphase measurement is referred to as a three-phase flow measurement situation. There are normally only two phases: namely gaseous fluids and liquid fluids flowing together. Produced water is normally considered the third phase. However, the water is a portion of the liquid phase, making the liquid phase actually a mixture of water and hydrocarbon liquid.
NOTE 2 Wet gas refers to a subset of multiphase flow in which gas is the dominant phase. While it is a highly important condition of multiphase flow, it is simply that-a special case of multiphase flow. As such, in what is described here, for the sake of clarity, multiphase flow metering system will generally be used in place of multiphase meter or wet gas meter or multiphase/wet gas meter. When special cases of wet gas or multiphase flow arise, they will be treated in an appropriate manner.View Less