|Publisher||Society of Petroleum Engineers||Language||English|
|Content Type||Conference Paper|
|Title||Multiphase Flowmeter and Production Logs Diagnose Well Response in an Onshore ADCO Field, Abu Dhabi|
|Authors||A. Khoori, M. AEK. Bekkousha, ADCO; B.G. Pinguet, E.P. Turna, T. Koshy, Schlumberger|
Middle East Oil Show, 9-12 June 2003, Bahrain
|Copyright||2003. Society of Petroleum Engineers|
In early 2002, Abu Dhabi Company for Onshore Oil Operations (ADCO) ran a production-logging program on a high-performance onshore well with an intensive surface welltesting program. This involved running a multiphase flow meter in combination with a calibrated gauge tank and a test separator, in order to qualify the metrological performance of the multiphase flow meter. The objectives were to determine well productivity, establish the flow profile of the reservoir, and assess the performance of the multiphase flowmeter.
This paper describes the benefit of advanced multiphase flowmeter technology and the verification of its performance accuracy against production logs and surface equipment.
In addition to the accuracy computations, the repeatability and linearity of each measuring device were also evaluated. Examples will be given.
The paper also illustrates how this multiphase flowmeter technology improved the diagnosis of the actual well response.
Production logging assists production engineers in analyzing well performance. For instance, increased water production in a well could be investigated by running a production log so that water entry points are found and water rates are measured.1 Analysis can suggest an action that can improve the well productivity for a poorly performing well.
Well response is best diagnosed when information from production logging is coupled with accurate surface rate and pressure measurements. This advantage becomes more apparent in complex reservoir lithology or well configurations. In order to address this need, ADCO planned and carried out a production-logging survey for one of its high-performance wells that included surface measurements from three independent devices.
Multiphase flow metering technology has attracted a lot of attention in the oil and gas industry for more than a decade. Established technologies over the years, combined with recent developments, have consolidated the position of multiphase flow metering in the oil industry worldwide.
Using a multiphase flowmeter (MFM) for exploration, development, and production wells2,3 has been proved to be successful with many field applications. It is not the objective of this paper to review use of MFM in each of these cases; it is only intended to present the major advantages. The main benefits of well testing with MFM are:
In order to assess the performance of MFM, ADCO decided to use a calibrated gauge tank and a test separator on the surface for comparison purposes. The core of the test was a tool for production logging that measures flow rates downhole. The downhole rates were converted to surface rates and then compared with MFM readings.
It is a conventional practice to evaluate the performance of MFM with a test separator in the field applications. This has raised questions about measurement uncertainties between the test separator and the MFM.4 In this case, having one downhole and three surface measurements recorded by independent measuring devices and with different measurement principles clarified these issues.
Test objectives and design
For the first time in an onshore ADCO well, production rates were recorded by an exhaustive surface test setup and a tool downhole. The well was producing around 3,800 STB/D with no water at the time. The specific gravity of the produced oil is 0.835 (28°API). The test objectives were to:
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