A New Instrument for Measuring Bulk and Grain Volumes
- William L. Russell (A&M College of Texas)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- July 1957
- Document Type
- Journal Paper
- 51 - 53
- 1957. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.6 Formation Evaluation & Management
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A new instrument for measuring bulk and grain volumes is described, and compared in accuracy with two modifications of Nutting's method. All three methods are reasonably fast, and in all three the probable error in the determinations of bulk volume can be kept down to about 0.1 to 0.2 per cent.
The new pycnometer described in this paper is designed to give speed without sacrificing accuracy. Some time ago Russell described a somewhat similar apparatus; however, the instrument described in the present paper is more accurate. Nutting designed the pycnometer shown in Fig. 1 (A and B), and Pirson has shown points like those of Fig. 1-D. The procedure described in this paper for using Nutting's pycnometer has been modified from that used by Nutting.
Choice of Liquids
The best liquids for measuring grain volumes are hydrocarbons or chlorinated hydrocarbons which evaporate slowly. Trimethylbenzene or mesitylene, triethylbenzine, carbon tetrachloride, and tertalin have been used for this purpose. Any of these liquids or mercury may be used for measuring bulk volume.
Preventing Errors Due to Invasion of Liquid
Errors due to the invasion of the porous, permeable bulk samples by the liquid of measurement may be prevented or greatly reduced by using mercury, by applying an impervous coating, or by soaking the bulk samples in the liquid of measurement until bubbles cease issuing from them. Errors are produced only by the invasion of the samples which occurs between the movement when the samples are weighed in air and the moment the weight of liquid displayed by the sample in the pycnometers is determined. No error is produced by varying degrees of filling of the pore space of the samples by the liquid of measurement.
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