Method for treating tubulars with a gelatin pig

Details Method for treating tubulars with a gelatin pig Method for treating tubulars with a gelatin pig

1992-03-16

1993-06-01

Pianalto, Bernard

Coating processes

Frictional application

134 8, 134 15, 134 2211, 134 2214, 134 26, 427238, 427239, B08D 500

Patent

active

052157814

ABSTRACT:
An ablating gelatin pig for use in tubulars which can easily negotiate the bends, etc in a tubular. Due to the properties of gelatin, the pig will ablate thereby depositing a protective layer onto the wall of the tubular. The pig can be molded outside the tubular or it can be formed in situ. The pig is formed by mixing common gelatin with a heated liquid and then allowing the mixture to cool to ambient temperature. Preferably, the liquid includes a treating solution (e.g. corrosion inhibitor, drag reducer, etc ) which is to be used to treat the pipeline. In some applications, a slug of the treating solution is also passed through the pipeline between two ablating gelatin pigs. For high temperatures applications, a hardener may be added to the pig to increase the melting temperature of the pig and/or a slug of the hardener can also be passed through the pipeline between two ablating gelatin pigs if necessary.

REFERENCES:
patent: 4254559 (1981-03-01), Purinton
Kirk-Othmer, third ed., vol. 11, Gelatin, pp. 711-715.

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