Production Measurement & Allocation CPMA Robbie Lansangan, Ph.D. Measurement Eng. Technical Authority BP Upstream Global Projects

Transcription

1 Production easurement & Allocation CPA 20.1 Robbie Lansangan, Ph.D. easurement Eng. Technical Authority BP Upstream Global Projects

2 Presentation Outline What is CPA and where does it fit in the API COP? Intent of the CPA What are the CPA Working Groups? Brief description of the subsections

3 What is CPA? CPA Committee on Petroleum easurement & Allocation * 20.1 Introduction to Production easurement and Allocation Production ultiphase easurement Flow Using easurement Single Phase CPA 20.4 Phase Behavior 20.5 Well Rate Determination * While all subsections 20.1 through 20.6 are working groups under CPA, section 20.1 serves to introduce all the other sections and contain common subject matter Allocation

4 What is CPA s SoW? CPA serves to address and provide standardized guidance on measurement technologies and procedures associated with oil and gas production. Addresses the application of single-phase fluid measurement standards in typical production operations upstream of custody transfer points and before production streams are fully processed and/or stabilized. Recommendations for multiphase flow measurement, and the application of phase behavior calculations. Addresses periodic production well rate determination and the allocation of reference measurements of combined and/or commingled flows (typically custody transfer measurement) to the individual wells or production fields

5 Where does CPA reside? COP COET COL CPA CELE COA COQ/ AST D02.02 COGF Education & Training Tank easurement Production easurement Evaporative Loss Estimiation Accountability & Reconciliation Sampling, Sediment & Water Gas Fluids Tank Gauging Allocation arine easurement Statistics* Gas easurement etering Physical Properties Calculations & Statistics* ass easurement

6 What is the CPA in relation to COP The API anual of Petroleum easurement Standards (PS) produced by the COP, addresses primarily custody transfer of fiscalbased measurement systems and operations CPA addresses production allocation measurement upstream of the custody transfer point/s

7 CPA Structure Typical Gas Recycled Streams * 20.1 Introduction to Production easurement and Allocation CPA * While all subsections 20.1 through 20.6 are working groups under CPA, section 20.1 serves to introduce all the other sections and contain common subject matter. Field A D P Inlet Sep. A D P Gas Lift Fuel Gas Dehy Typical Custody Transfer etering Location 20.2 Production easurement Using Single Phase 20.3 ultiphase Flow easurement 20.4 Phase Behavior 20.5 Well Rate Determination 20.6 Allocation Field B Injection Well Inlet Sep. B Separator 3 rd Stage Entry 2 nd Stage Entry Separator ulti- Stage Gas Comp. 1 st stage (VRU) entry Scrubber Liquid Recycle Final Liquid Processing Produced Water Handling Oil Shipping Pumps Typical Custody Transfer etering Location

8 CPA 20.2 Production Allocation easurement Using Single Phase Devices Chapter 20.2 document addresses single-phase measurement techniques upstream of the custody transfer points where custody transfer conditions are not possible. discusses measurement devices used in the allocation process and located downstream of the first stage of separation on a production facility. addresses the common allocation measurement devices for liquid hydrocarbons, water, and gas including sampling and ancillary systems such as fuel, flare, and recirculation. Field A Field B Injection Well D P Inlet Sep. A D P Inlet Sep. B Separator Typical Gas Recycled Streams Gas Lift Fuel 3 rd Stage Entry ulti- Stage 2 nd Stage Entry Gas Comp. Separator Gas Dehy Scrubber Liquid Recycle 1 st stage (VRU) entry Typical Custody Transfer etering Location Final Liquid Processing discusses configuration and operation of measurement equipment as well as discusses the production fluid processing and associated flow conditions and their affects on the quality of the measurement results. Produced Water Handling Oil Shipping Pumps Typical Custody Transfer etering Location provides methods for determining separator efficiencies and recommends corrective practices.

9 ultiphase Flow easurement The 20.3 WG will address multiphase flow measurement in the production environment, upstream of the custody transfer (single-phase) measurement point. These applications include but are not limited to: measurement for reservoir management, well tests, and flow allocation from downstream reference measurements including onshore, off shore or subsea production systems. The document will provide practical standards and processes concerning multiphase flow measurement for regulatory authority, users and manufactures CPA 20.3

10 Draft Standard for Phase Behavior Application in Upstream easurement & Allocation CPA 20.4 This draft standard will provide a guideline on the proper application of phase behavior in upstream production measurement and allocation. While production measurement system and allocation processes could vary, there are base commonalities across the board in terms of phase behavior application. East West The draft standard scope will include minimum PVT data set requirements, fluid sample planning, PVT studies specific to production allocation, PVT data uncertainty, PVT model development, PVT model validation and PVT model maintenance.

11 CPA 20.5 Well Rate Determination This document addresses the use of production facilities and associated measurement systems in order to determine the production rates (commonly called welltest results) of oil and gas wells. Well #1 Well #2 ulti-port selector valve or manifold system S Gas Composition Gas eter F Welltest information will be used to determine production quantities. This document will discuss the various reasons for performing periodic welltests and the various production operational scenarios associated with welltesting. Well #3 Well #4 Well #5 Well #6 (typ.) WHP P Flow Line Pressure Flow Line Nodal Analysis Separator S P T L F Oil eter Oil Composition F Water eter DCS, PI, etc. Flow Computation and Control specifically address the welltest operation resulting in the observed production rate of oil, gas, and water. Subsequently, the welltesting results are used for the determination of theoretical production quantities in production measurement and allocation systems. BHP P Flow

12 CPA 20.6 Recommended Practice for Allocation of Commingle Production Quantities This document will address the issues and give consideration for the allocation of commingled production quantities as it relates to the process of attributing the final (end-of-process, normally custody transfer) measured quantities of oil, gas, and produced water, back to the individual production sources and/or production wells. The range of operations will include production, upstream area gathering systems, and certain pipeline operations where phase change is inherent to the operation Primarily the RP will describe industry accepted allocation algorithms that recognize the various methodologies currently in use in major theaters of operation. The document will describe the integration of uncertainty terms in the allocation formulation (uncertainty based allocation) and address measurement system and commingling scenarios where uncertainty based allocation is appropriate. Standard volume, mass, energy, and component-mass based allocation systems will all be described. Sales Volume Fiscal Allocation X Well Set (1) Well Set (i) Well Level Allocation Y Well (1-1) Well (1-j) Well (i-1) Well (i-k)

13 CPA 20.1 Overview of Production easurement and Allocation This section is an introductory document where all the subsequent subject areas within the production measurement arena are touched upon in an overview fashion. Some subjects that truly apply to many or all of the specific areas may be housed in further detail within the revised 20.1 section. For example defined terms and computational procedures from measured quantities to standard quantities may be addressed in section 20.1 due to the general applicability of these particular subjects.

14 In Summary CPA provides guidance and standards in measurement systems and procedures for oil & gas production upstream of the custody transfer point QUESTIONS?