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Evaluation of the Performance of a New Biodegradable AA-LDHI in Cyclopentane Hydrate and CH/CH Gas Hydrate Systems

Abstract : The main objective of this work is to evaluate the performance of a readily biodegradable anti-agglomerant, called AA-LDHI, not harmful for the environment following the European legislation. It was tested in cyclopentane (CP) hydrate and methane (CH 4)/propane (C 3 H 8) hydrate systems. The performance of AA-LDHI was first tested in a batch reactor by torque measurements with the two hydrate systems in oil-dominated conditions (70 vol%). The experiments were performed for a subcooling of 6 °C for the CP-hydrate and up to 17 °C for the gas hydrate. The impact of AA-LDHI on hydrate growth pattern and on hydrate crystal morphology were investigated by microscopic observations at the water/CP interface for the CP-hydrate system, and at a water/(n-octane + CH 4 /C 3 H 8) interface for the gas hydrate system. Then, AA-LDHI was evaluated in a semi-industrial flow loop. Without surfactant, the hydrate formed a polycrystalline shell at the water/oil interface. With AA-LDHI, large conical hydrate crystals with the vertex pointing to the aqueous phase grew at the interface before sinking in the aqueous phase. The results obtained with both CP and gas hydrates are consistent amongst themselves. In the batch reactor experiments without surfactant, hydrate crystallization led to a significant increase in the torque value and finally to the blockage of the agitator. With AA-LDHI, the torque remained almost constant at the baseline showing that this AA presented good anti-agglomeration performance. The microscopic observation in a CP phase of CP-hydrate particles formed in the reactor showed large water-wettable particles (about 400 μm) gathered in clusters but not agglomerated. AA performance of AA-LDHI was also evaluated in a semi-industrial flow loop (1-inch diameter & 35.6 m total length) in similar conditions with CH 4 /C 3 H 8 mix gas but using real condensate. This experiment proved that the AA-LHDI is fully efficient in transporting safely hydrates.
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Submitted on : Friday, March 27, 2020 - 1:23:57 PM
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Delroisse Henry, Barreto Gilles, Torré Jean-Philippe, Christophe Dicharry, Glénat Philippe. Evaluation of the Performance of a New Biodegradable AA-LDHI in Cyclopentane Hydrate and CH/CH Gas Hydrate Systems. SPE Middle East Oil and Gas Show and Conference, Mar 2019, Manama, Bahrain. ⟨10.2118/195054-MS⟩. ⟨hal-02521384⟩

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