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Septi Anggraeni
Research and Development Centre for Oil and Gas Technology "LEMIGAS"
Chemical Engineering, Chemistry & Bioengineering Energy

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A LABORATORY STUDY TO IMPROVE ACID STIMULATION IN SANDSTONES Septi Anggraeni; Junita Trivianty; Bambang Widarsono
Scientific Contributions Oil and Gas Vol 29 No 3 (2006)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.29.3.1029

Abstract

The main purpose of acidizing is to improve well productivity. Acids are useful for this reason because of their ability to dissolve undesired formation minerals and materials which may either be intrinsic in nature or be introduced into the formation during the processes of drilling, completion, and production. The effectiveness of acids in improving productivity in a particular well essentially depends on an accurate analysis of the problem and the selection of acid.Prudent judgment in acid to be used should be confirmed by laboratory tests. Apart from the analysis on the nature of the formation damage itself, acid selection should be based on study of reservoir rocks mineralogy and characteristics in general and accordingly the relevant material/minerals to be dissolved or removed. Improper diagnostics may result in inefficient, and even damaging, acidizing. Various studies have been conducted in this highlight (e.g. Crowe, 1984; Gidley, 1971; Crowe in Economides and Nolte, 1989; Daccord in Economides and Nolte, 1989; Ali, 1981; and Piot and Perthuis in Economides and Nolte, 1984).Those studies conducted in the past reveal that in comparison the success ratio of acidizing for limestone reservoir is almost 90%, whereas for sandstone reservoir the success ratio is only 30%. Undoubtedly, this disparity in success ratios is caused by the fact that appropriate acids dissolve limestones more properly due to limestones generally simpler mineral composition and by the fact that sandstones usually have more complex mineralogy hence providing less simple materials to dissolve. From this point Those studies conducted in the past reveal that in comparison the success ratio of acidizing for limestone reservoir is almost 90%, whereas for sandstone reservoir the success ratio is only 30%. Undoubtedly, this disparity in success ratios is caused by the fact that appropriate acids dissolve limestones more properly due to limestones generally simpler mineral composition and by the fact that sandstones usually have more complex mineralogy hence providing less simple materials to dissolve. From this point
UPSCALING PERMEABILITY Septi Anggraeni; Harry Hardiman
Scientific Contributions Oil and Gas Vol 25 No 2 (2002)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.25.2.1065

Abstract

In reservoir simulation, the engineer needs a set of permeability values estimated on grid block which are as representative as possible of the true value. However. the sample data is limited to small scale measurement relative to the scale of reservoir simulation. Therefore. we need to upscale the permeability data measurement by averaging permeability on volumes. Prior to obtain the appropriate averaging method, an upscaling experiment was performed. The averaging method at the plug scale can be specified from the probe data and the Hassler cube data, by comparison.
APPLICATION OF CT-SCAN IN CORE ANALYSIS Septi Anggraeni; Indra Jaya
Scientific Contributions Oil and Gas Vol 23 No 3 (2000)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.23.3.1085

Abstract

Computerized tomography (CT) is a new radiological imaging technique that measures density and otomic composition inside object. Since 1980, the CT has been applied in petrophysics and reservoir engineering. This paper discusess several petrophysica application in core analysis such as: quantification of complex mineralogy, characterixation drilling fluid invasion core quality control bedding detection, porosity determination, and fracture analysis.
THE USE OF MTS (MULTIPLE TIP SIZE) PROBE PERMEAMETER METHOD IN CARBONATE ROCK Septi Anggraeni
Scientific Contributions Oil and Gas Vol 22 No 2 (1999)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.22.2.1090

Abstract

The fundamental control in petrophysical properties of carbonate rock can be quite different from sandstone, there-fore it needs different technique in permeability assessment. In this study we proposed a technique to assess permeability using probe permeameter for carbonate rock.The technique applied Multiple Tip Size (MTS) Probe permeameter which provides speedy, non destructively sampling at a significantly increased density. The key feature of the MTS is the use of different tip size. By using the MTS probe permeameter, the data can be screened to assess the appropriate data
Co-Authors Bambang Widarsono Harry Hardiman Indra Jaya Junita Trivianty