Flow Modeling and Comparative Analysis for a New Generation of Wireline Formation Tester Modules

Kristensen, M.; Ayan, C.; Chang, Y.; Lee, R.; Gisolf, A.; Leonard, J.; Corre, P.-Y.; Dumont, H.

doi:10.3997/2214-4609-pdb.395.iptc-17385-ms

IPTC 2014: International Petroleum Technology Conference 2014

DOI: 10.3997/2214-4609-pdb.395.iptc-17385-ms

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Flow Modeling and Comparative Analysis for a New Generation of Wireline Formation Tester Modules

M. Kristensen¹,

C. Ayan²,

Y. Chang³

et al.

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Integrated Characterization Workflow Enables Ecuador NOC to Increase Oil Production from Very Thin Sand Reservoirs

Izurieta

Pastrana

Pazos

et al. 2015

SPE Latin American and Caribbean Petroleum Engineering Conference

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The objective of this paper is to describe a comprehensive approach integrating static and dynamic well characterization to optimize well completion and subsequent improving oil production in thin sand reservoirs.The following procedure was used to estimate and optimize the production potential of 3 feet sand reservoir located in Limoncocha Field:• Accurate well logging program to identify thin sands. (Vertical Resolution, Static Data) • Open Hole Mini DST program to estimate permeability, skin effect, and reservoir pressure and productivity index. (Dynamic Data) • Anchored guns with 800 psi of static underbalance to avoid control fluid invasion. • Well completion done with drilling rig; No well test is required using this methodology. • PVT sample taken in cased hole for further characterization and continuous improvement.

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Integrated Characterization Workflow Enables Ecuador NOC to Increase Oil Production from Very Thin Sand Reservoirs

Izurieta

Pastrana

Pazos

et al. 2015

SPE Latin American and Caribbean Petroleum Engineering Conference

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Optimization of Downhole Fluid Sampling Using Focused Probes

Kristensen

Machado

Chugunov

2018

SPE Europec Featured at 80th EAGE Conference and Exhibition

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Acquisition of fluid samples using wireline formation testers is an integral part of reservoir evaluation and fluid characterization. The use of focused probe technology, in which the flow of mud filtrate to the main sampling port is shielded by one or more guard ports, has proved to be particularly effective in acquiring clean formation fluid samples with short pump-out times. To both improve operational efficiency for the current focused probes and optimize the design of next-generation tools, it is necessary to understand how to optimally operate the tools in different sampling environments. The objective of this study is to investigate optimal sampling strategies for focused tools in presence of formation and fluid property uncertainty. In particular, the pump rates for the sample and guard ports in a focused tool can be manipulated, allowing for optimization of pump rate profiles to maximize overall sampling efficiency. We use a numerical forward model of the filtrate cleanup process coupled with optimization. We study the problem of pump rate profile optimization in different sampling environments and compare the results against two operating strategies commonly applied in the field. The optimization results show that significant sampling time savings are possible (for each sampling station) compared with a default fixed-rate strategy, especially in environments characterized by a high viscosity contrast between the formation fluid and mud filtrate. These savings translate directly into rig time savings for the operator. In general, the results in the paper provide guidance on optimal focused-sampling operation in different environments.

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Flow Modeling and Comparative Analysis for a New Generation of Wireline Formation Tester Modules

Cited by 2 publications

References 0 publications

Integrated Characterization Workflow Enables Ecuador NOC to Increase Oil Production from Very Thin Sand Reservoirs

Integrated Characterization Workflow Enables Ecuador NOC to Increase Oil Production from Very Thin Sand Reservoirs

Optimization of Downhole Fluid Sampling Using Focused Probes

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