16 Analytical Instrumentation New Sample Temperature Control and 2D Inversion at SCA 2013
The Society of Core Analysts (SCA) is a chapter-at-large of the Society of Petrophysicists and Well Log Analysts (SPWLA). The SCA symposium is a four day conference and exhibition, which, in 2013, arrived in the Napa Valley for its 27th year. The symposium featured one workshop during the first day and a plenary technical session showcasing approximately 32 oral presentations and 28 posters. The annual symposium has a reputation for its high quality technical presentations in the area of Core Analysis, as well as for giving the main players in the industry the opportunity to showcase their latest technical innovations and offerings in equipment and services.
Magritek (New Zealand) were an active participant in the meeting where they showcased their new core sample temperature control system, the STC5401. This is a cost- effective accessory to the Magritek 2MHz Rock Core Analyser enabling accurate, stable control of sample temperature up to 80°C.
Magritek also demonstrated their new NMR Rock Core Analyser software version 4.1. This update has a wide range of improvements for ease of use and data processing and includes 2D Inverse Laplace- optional with an extra license. Magritek recently licensed this advanced capability from Schlumberger Technology Corporation, enabling advanced 2D NMR analysis including methods such as fluid typing.
Describing their exhibition plans before the SCA Symposium, Magritek's Head of Sales and Marketing, Dr. John Trail said "In addition to our new items we will be showing our standard strong suite of capabilities. Our high-resolution T2 measurements of tight cores using our short echo time P35 probe. With a minimum TE of 60 µs, the P35 can resolve T2 down to <0.1 ms making it ideal for shales. 4" diameter core measurements are straightforward in the same compact Magritek magnet using the P108 probe. Homogeneity of the magnetic field and probe in the Magritek system are key to accurate porosity measurements from the full sample."
Magritek's hardware and software are completely integrated. The software provides the optimal interface for all core analysis tasks with operation open and transparent
to the user. For standard core analysis it provides a straightforward interface for making routine measurements. For the research user, the advanced mode provides complete flexibility with control of all parameters including the ability for users to write their own pulse sequences.
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Measurement of Hydrocarbons in Drilling Mud and Oil in Water
Portable infrared analysers, such as the InfraCal Analysers from Wilks (USA), have been used worldwide for measuring off-shore oil in produced water for over 50 years. They have the advantage over other analytical instruments in that the measurement can be performed by non-technical users and it is relatively unaffected by composition changes in the effluent. They also provide off-shore users with the necessary ruggedness and reliability that is a key requirement.
In addition to their use for measuring oil content in produced water on oil drilling platforms, portable IR analysers are ideal for both on- and off-shore oil measurements in drill cuttings. If drill cuttings are to be disposed of via land application or overboard, there are limits on hydrocarbon levels depending on the disposal choice.
While water samples typically have hydrocarbon levels in the part per million (ppm) range, drill cuttings can be in the 1- 10% range. Both the InfraCal TOG/TPH Analyser Model HATR-T2 and the new InfraCal 2 Model ATR-SP are configured with horizontal ATR sample stages. Hexane, pentane or cyclohexane is used as the extraction solvent for oil in water levels from 0.3 to 1000 ppm range. The solvent is evaporated off and the infrared absorbance due to the residual oil film is measured.
The same InfraCal Analysers with an ATR sample stage can be used for the higher 1- 10% range found in drill cuttings. The sample is diluted by using a solvent that does not have an infrared absorbance at the hydrocarbon wavelength such as tetrachloroethylene (perchloroethylene) or S- 316 (dimer/trimer of chlorotrifluorethylene) and, therefore, does not require evaporation. The solvent dilution allows for the high percent range measurements with the same ATR sample stage used to measure the ppm levels.
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