Structure
design of and experimental research on a two-stage laval foam breaker for
foam fluid recycling
Wang Jin-song,
Cao Pin-lu* and Yin Kun
College of
Construction Engineering, Jilin University, 130026, Changchun, China
*Corresponding
Author?s Email : jluplc@163.com
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Publication
Data
Paper received:
25 June 2014
Revised received:
30 September 2014
Re-revised received:
01 January 2015
Accepted:
07 February 2015
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Abstract
Environmental,
economical and efficient antifoaming technology is the basis for achievement
of foam drilling fluid recycling. The present study
designed a novel two-stage laval mechanical foam breaker that primarily uses
vacuum generated by Coanda effect and Laval principle to break foam.
Numerical simulation results showed that the value and distribution of
negative pressure of two-stage laval foam breaker were larger than that of
the normal foam breaker. Experimental results showed that foam-breaking
efficiency of two-stage laval foam breaker was higher than that of normal
foam breaker, when gas-to-liquid ratio and liquid flow rate changed. The
foam-breaking efficiency of normal foam breaker decreased rapidly with
increasing foam stability, whereas the two-stage laval foam breaker remained
unchanged. Foam base fluid would be recycled using two-stage laval foam
breaker, which would reduce the foam drilling cost sharply and waste
disposals that adverse by affect the environment.
Key
words
Environmental
antifoaming, Foam drilling, Foam fluid recycling, Foam-breaking efficiency,
Two-stage laval foam breaker
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