Institute of Petroleum Engineering

Centre for Gas Hydrate Research Publications

Abstract 121
Experimental Investigation on the Effect of Commercial Oilfield Scale Inhibitors on the Performance of Low Dosage Hydrate Inhibitors (LDHI)
Masoudi, R., and Tohidi, B.
The 5th International Conference on Gas Hydrates, Trondheim, Norway, June 13-16 (2005).
In deep-water oil and gas exploration and production operations, hydrate and scale are two important flow assurance concerns. Specialty chemicals, including low dosage oilfield scale and hydrate inhibitors may be used to overcome these problems. However, compatibility of various chemicals is an important issue, when using two or more chemicals, as the interaction among chemicals may influence chemical performance and in some cases exacerbate at least one of the undesirable phenomena. Therefore, it is necessary to examine the performance of each chemical in the presence of other chemical that may be used under operating conditions. In this work, an experimental investigation has been carried out, using a hydrate kinetic rig with mixing capability, on the effect of three commercial scale inhibitors on the performance of LUVICAP, a known LDHI in the industry, which contains 40 mass% PVCAP and 60 mass% ethylene glycol (EG). These scale inhibitors are: BELLASOL S40, which is an aqueous solution of Phosphinocarboxylic Acid supplied by Biolab Water Additives, BRIQUEST 543-45AS supplied by Rhodia Consumer Specialities Limited, and SCALETREAT 810 supplied by Clariant Oil Services. Two concentrations of scale inhibitors, i.e., 200 and 1000 ppm, with a constant concentration of LUVICAP of 1.25 mass% have been tested at favorable conditions for hydrate formation. The results show that, for the system of natural gas and water with hydrate kinetic inhibitor, different scale inhibitors have different effects on the performance of LUVICAP, however in general; the studied scale inhibitors play a synergist role and improve the performance of LUVICAP at the studied conditions.

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