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Title: Field Experience With Real Time Water-In-Oil Monitoring
Author: Claudio Barreiros,Jose Alberto Pinheiro, Marcelo A. L. Gonalves,Gualton Manhes, Josaphat Dias Da Mata, Ricardo Pessanha, Roberto Guedes
Source: Flomeko 2000
Year Published: 2000
Abstract: Water-in-oil or BSW monitoring in produced oil streams on offshore platforms in Campos Basin, Brazil, consists of a daily basis procedure to calculate the total liquid production balance. The measurement of the water cut becomes more critical through time when there is a natural depletion with a consequent decrease in the reservoir production, normally followed by an increase in water production, which can mask the oil fiscal metering. It is fundamental to consider the instability of the oil flow from the reservoir caused by gas or water slug, in the production columns, which can cause problems with sampling representivity and results from laboratory analysis carried out within pre-set periods. In the case of Petrobras, each analysis run represents the average value of six samples collected at the field locations and eventually the process of sampling can be problematic because of the process variations. Oils analysis is performed using centrifuging, decanting and by means of differential pressure measurement and none of these processes can be used in a continuous on-line basis. In order to guarantee a better representivity in the oil and water metering, a real time metering process is necessary. This can eliminate the constraints of the non-continuous metering processes and make the automation of the manifolds and oil gathering stations possible as well as the reduction of the total measurement uncertainties, among other advantages.

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