Select Page

Traditionally, permanent monitoring has primarily referred to downhole pressure and temperature measurement. However, development and deployment of accurate and reliable downhole flowmeters has extended the types of in-well measurements available to fluid flow rates and phase fractions.

Downhole Fiber-Optic Multiphase Flowmeter

Compiled by : Nugroho Wibisono

This article, written by Technology Editor Dennis Denney, contains highlights of paper SPE 77655, ‘Downhole Fiber-Optic Multiphase Flowmeter: Design, Operating Principle, and Testing,’ by Tor K. Kragas, SPE, F.X. Bostick III, SPE, and Christopher Mayeu, Weatherford Completion Systems; Daniel L. Gysling, SPE, CiDRA Corp.; and Alex van der Spek, Shell Intl. E&P B.V., originally presented at the 2002 SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 29 September-2 October.

Real-time, downhole, multiphase flow-rate data are of significant value for production optimization, particularly for high-cost deepwater developments and complex multilateral wells. Continuous measurements of downhole flow rates in producing wells generally have not been available because of difficulties in designing and deploying measurement devices. The design, operating principles, and flow-loop testing of an all-fiber-optic multiphase flowmeter for downhole deployment are presented.

Introduction

Traditionally, permanent monitoring has primarily referred to downhole pressure and temperature measurement. However, development and deployment of accurate and reliable downhole flowmeters has extended the types of in-well measurements available to fluid flow rates and phase fractions. Applications of downhole flow data include the following.

-Zone production allocation.

-Identifying and localizing production anomalies.

-Directly determining productivity index.

-Commingling production.

-Reducing the number of surface tests.

-Reducing the surface facilities.

Fig. 1 shows hydrocarbon flow regimes that may occur in the wellbore. Although the downhole environment imposes significant design challenges for hardware manufacturers, the higher pressures and lower gas-volume fractions (GVFs) that exist downhole typically result in conditions that are more conducive to multiphase flow measurement than conditions at the surface.

Selengkapnya :

Share This