Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sounds good? Determination of a gas/brine interface by an acoustic
  method at Manosque   Water hammers commonly are observed at wellheads and often are considered a
potential hazard that should be avoided. Nevertheless, there are a few
situations in which water hammers provide very valuable information about a
well. A comprehensive data-acquisition and analysis system has been developed
by Brouard Consulting and Ecole Polytechnique. One potential application of
that system is determining the depth of an interface between two fluids. This
application has been tested successfully at the Manosque field. It is
demonstrated here how this low-cost and non-intrusive system can be accurate
and allows practical, real-time measurements.

34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
16
The categories of this paper are: stat
18
The categories of this paper are: econ
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg