Differential Strain Analysis: An Investigation Over Its Feasibility For Determining Coals Cleat Orientation  

Oleh:

Widarsono, Bambang

Jenis: Article from Journal - ilmiah nasional
Dalam koleksi: Lemigas Scientific Contributions to Petroleum Science & Technology vol. 33 no. 02 (Sep. 2010), page 106-114.
Topik: Coal; Cleats; Coal Bed Methane; Effective Production; Cleat Orientatiton; Differential Strain Analysis; Core Sample; Better Coal Characterization;

Ketersediaan

Perpustakaan PKPM Nomor Panggil: L15 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

GAs Production from coal bed methane (CBM) has been rising as supplement to conventional gas reservoirs. Effective CBM production is much determined by well placmenet with regards to orientation of the coal reservoir's face cleat. This is true since this cleat type provides the main path of fluid migration from storage to welbore. It is therefore imperative to understand and determine the general orientation of the cleats of concern. This information is usually obtained from visual description on core samples, and whenever available from analogy to outcrop data. This is consider as inssuficient and a means for studiying core sample's interior is required in order to ensure consistency between external and internal appearances. This paper presents an investigative study over the possibility of differential strain analysis (DSA) technique to serve purpose. The technique is normally used for measuring subsurface in situ stress field, and through the use of a similiar basic concept it is purposed to be used for determining orientation of face cleats in coal samples. The study includes uilization of DSA data obtained from measurement on samples taken from greath depths. Review and re-working over the data has shown that the technique can well indicate the oreintation of face cleats. A general orientation over all tasted sample is also indicated with resonable degree of reliability. This leads into conclusion that the DSA technique can be well used into indicate cleat orientation and therefore help in better characterizing coal.

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