This document is not an API Standard; it is under consideration within an API technical committee but has not received all approvals required to become an API Standard. It shall not be reproduced or circulated or quoted, in whole or in part, outside of API committee activities except with the approval of the Chairman of the committee having jurisdiction and API staff. Copyright API. All rights reserved. Manual of Petroleum Measurement Standards Chapter 20.1 Production Measurement and Allocation Systems DRAFT SECOND EDITION, FEBRUARY 2019 i This document is not an API Standard; it is under consideration within an API technical committee but has not received all approvals required to become an API Standard. It shall not be reproduced or circulated or quoted, in whole or in part, outside of API committee activities except with the approval of the Chairman of the committee having jurisdiction and API staff. Copyright API. All rights reserved. Change Log Issue Date Issued by Modification 0 2012-09-06 Roy Meyer Second Edition Draft Created 0a 2012-12-19 Roy Meyer Inserted Change Log Added RP85 6.8, 7. Changed flowline to flow line 0b 2013-01-28 Roy Meyer Deleted section content for sections to be covered by 20.2 0c 2015-09-30 Arun Kurian Updates from WG3 0d 2016-08-04 Arun Kurian Ongoing Updates Changed title 0e 2016-09-14 Arun Kurian 80% Draft for first WG ballot 0f 2016-12-07 Arun Kurian Dec 7-8 Drafting Group Update og 2017-03-01 Arun Kurian Jan Drafting group updates 0h 2017-06-28 Arun Kurian May/June Drafting group updates 0.1 2017-08-08 Arun Kurian Clean copy for drafting team review 0.2 2017-09-20 Arun Kurian Copy for WG Review on Sept 20/2017 0.5 2019-01-07 Arun Kurian Extensive updates from WG Review and ballot results 0.6 2019-02-11 Arun Kurian For WG Ballot ii This document is not an API Standard; it is under consideration within an API technical committee but has not received all approvals required to become an API Standard. It shall not be reproduced or circulated or quoted, in whole or in part, outside of API committee activities except with the approval of the Chairman of the committee having jurisdiction and API staff. Copyright API. All rights reserved. Table of Contents 1 Scope ....................................................................................................................................... 1 2 Normative References .............................................................................................................. 1 3 Terms, Definitions, Abbreviations and Symbols ........................................................................ 1 3.1 Terms and Definitions .................................................................................................... 1 For the purposes of this document, the following terms and definitions apply. .................................. 1 3.2 Abbreviations and Symbols ........................................................................................... 7 4 Overview of a Production Measurement and Allocation System .............................................. 8 4.1 General .......................................................................................................................... 8 4.2 Applicability .................................................................................................................... 8 4.3 PMAS Business Process Workflow ............................................................................. 10 5 Identify Production Measurement and Allocation System Requirements ............................... 12 5.1 General ........................................................................................................................ 12 5.2 Roles and Responsibility ............................................................................................. 12 5.3 Governmental Requirements ....................................................................................... 12 5.4 Commercial and Royalty Agreements ......................................................................... 12 5.5 Reservoir/Production Management ............................................................................. 12 5.6 Acceptance Criteria ..................................................................................................... 13 6 Select Basis of Allocation ....................................................................................................... 13 6.1 General ........................................................................................................................ 13 6.2 Fluids to Allocate ......................................................................................................... 13 6.3 Frequency of Allocation ............................................................................................... 13 6.4 Engineering Units and Physical Constants .................................................................. 13 6.5 Material Balance .......................................................................................................... 14 7 Define Allocation Process ....................................................................................................... 16 7.1 General ........................................................................................................................ 16 7.2 Considerations for Defining an Allocation Process ...................................................... 17 7.3 Allocation Tiers ............................................................................................................ 20 7.4 Allocation Process Inputs and Outputs ........................................................................ 22 7.5 Procedures and Formulations for the Determination of Net Theoretical Quantities .... 33 7.6 Allocation Method ........................................................................................................ 46 8 Implement Production Measurement and Allocation System ................................................. 47 8.1 General ........................................................................................................................ 47 8.2 Measurement and Allocation Process Flow Diagram (MAPFD) .................................. 47 8.3 Measurement Equipment Lists for Allocation Inputs .................................................... 48 8.4 Allocation Algorithm ..................................................................................................... 49 8.5 Equipment Verification ................................................................................................. 49 iii This document is not an API Standard; it is under consideration within an API technical committee but has not received all approvals required to become an API Standard. It shall not be reproduced or circulated or quoted, in whole or in part, outside of API committee activities except with the approval of the Chairman of the committee having jurisdiction and API staff. Copyright API. All rights reserved. 8.6 Fluid Quality Verification .............................................................................................. 49 8.7 Data Handling and Storage ......................................................................................... 50 8.8 Contingency Plan ........................................................................................................ 50 8.9 Phase Behavior Calculation Basis ............................................................................... 50 8.10 Well Testing Application Basis ..................................................................................... 51 9 Operate and Manage Production Measurement and Allocation System ................................ 51 9.1 General ........................................................................................................................ 51 9.2 Performance Capability Assessment ........................................................................... 51 9.3 Review ......................................................................................................................... 52 9.4 Modifications ................................................................................................................ 52 9.5 Performance Monitoring and Reporting ....................................................................... 53 9.6 Out-of-Tolerance Performance Management .............................................................. 53 Annex A ............................................................................................................................................ 55 A.1 Onshore Scenario Description ................................................................................................ 55 A.2 Identify PMAS Requirements.................................................................................................. 57 A.2.1 Roles and Responsibilities .......................................................................................... 57 A.2.2 Governmental and Commercial Requirements ........................................................... 58 A.2.3 Reservoir / Production Management Requirements .................................................... 64 A.2.4 Acceptance Criteria ..................................................................................................... 64 A.3 Select Basis of Allocation ......................................................................................................