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Vienna, Austria

Schmager T.,ABB | Kinast J.,RAG
Petroleum and Chemical Industry Conference Europe Conference Proceedings, PCIC EUROPE | Year: 2012

This publication describes the challenges and experience with the four electric variable speed drive systems, type LCI, rated at 15.5 MW, installed at RAG's (Rohöl-Aufsuchungs Aktiengesellschaft) gas storage facility in Haidach, Austria. The project consists of two phases. At the time of implementation of phase one, the second phase was optional. In the first phase of the project, which started in 2005, two drive systems were installed to control the gas compressors at the underground gas storage facility. The project was expanded in 2010 with two additional identical drive systems. Special focus will be on the challenges of adding variable speed drives to an existing environment and the operational experience so far. © 2012 PCIC. Source

Sam G.,RAG | Kaestenbauer M.,RAG | Burgstaller C.,RAG | Chevelcha E.,University of Leoben
Society of Petroleum Engineers - SPE Asia Pacific Oil and Gas Conference and Exhibition 2011 | Year: 2011

The fully automated fluid level measurement tool was developed recently. The paper describes the technical features of the tool and shows via case study the results of the field tests on various Electrical Submersible Pumps - ESPs and sucker rod pumps - SRP, running with and without Variable Speed Drive - VSD. The unique feature of this system is its fully automated and purely electronic functioning. The measuring device is enclosed, mounted on the casing valve, has a pressure rating of 350 bar (5000psi) and works with zero emissions on the environment (no outlet of casing gas). Compared with a conventional downhole pressure sensor, mounted on an ESP, the system is insensitive to high well fluid temperatures and simple to maintain due to its easy access on surface location. It additionally has a sampling rate of down to one measurement per minute. The measured fluid level data can be transmitted via SCADA system. The measurement tool enables to run a pump in a more safe way. It can be used to avoid pump off conditions and the resulting equipment damage. It can also be used to control a VSD to keep the fluid level in a well at a specific depth to avoid bottomhole flow conditions below the bubble point pressure. Due to the availability of online fluid level data, all kind of pumps (e.g. ESP, Sucker Rod, PCP, Jet Pump) can be operated safely at more aggressive production rates in order to mobilize more oil. Furthermore the vision and corresponding thoughts of acoustic well diagnosis, also a feature of the tool which is currently under investigation, are presented. Copyright 2011, Society of Petroleum Engineers. Source

Andiappan A.,RAG | Hofstatter H.,University of Leoben | Mussig S.,RAG | Barth P.,ESK Ceramics
Oil Gas European Magazine | Year: 2014

Screen only systems (such as wire-wrapped screens) and gravel-pack completions are amongst the common options used in unconsolidated reservoirs. A new sand controlfilicr on the basis of industrial ceramics (SIC) was developed primarily for the Danish offshore sector with low permeability and porosity reservoirs, requiring a bare minimum of pressure loss across the productive zone andprotection of the well equipment against erosion from proppant backflow during clean-up ("Defeating Sand with "Sand' Ceramic Screens -Successful PilotApplicalions ", Proc. DGMK Spring Meeting p. 312 if (2011)). In the meantime a number of successful applications of ceramic sand screens have been reported in the literature, e. g. "Sand Control with Ceramic Screens in Unconsolidated Reservoirs demonstrated in the mature Gaiselberg Oilfield" Proc. DGMK Spring Meeting p. 285ff (2012), "Ceramic screens, an innovative downhole sand control solution for old and challenging cased hole solutions in Bolivia" SPE 166092, Proc. ATCE 2013, etc. The behaviour of ceramic screens in comparison to state of the art metal screens is not yet fully understood. RAG installed ceramic screen instead of a state of the art metal screen in their mature Gaiselberg oil- field. The latter caused an immediate decline in the production rate due to plugging, while the ceramic screen showed constant production rates. This was believed to be due corrosion triggered by erosion. Therefore a comparative investigation of plugging and scaling processes that occurs in stainless steel and ceramic screens was carried out. The results of this study are presented in this article. The results show significant advantages of the ceramic sand screen compared to conventional stainless steel applications. © 2014 URBAN-VERLAG Hamburg/Wire GmbH. Source

Bourges M.B.,Geovariances | Deraisme J.D.,Geovariances | Derksen R.D.,RAG | Reutemann M.R.,RAG
73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011: Unconventional Resources and the Role of Technology. Incorporating SPE EUROPEC 2011 | Year: 2011

A velocity calibration has been performed using a 3D PSTM velocity cube and 600 well time/depth curves. The purpose was twofold: to perform the quality control of the data and measure the added value of the seismic data integration to obtain a velocity model. This model was then used to convert 3D seismic to "depth" in order to better identify smaller structures not visible in the time domain. Therefore two velocity models have been obtained; one using only the wells information, the other integrating the seismic velocity. These two velocity models have then been checked and compared. The velocity models show rather large misties at wells. This is mainly explained by the filtering during the interpolation of a small scale variability component that has been interpreted as artefacts. Finally, several perspectives that may help to reduce the misties have been discussed: as local geostatistics and flattening. Source

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