Journal
ENERGIES
Volume 4, Issue 1, Pages 140-150Publisher
MDPI AG
DOI: 10.3390/en4010140
Keywords
marine gas hydrate; drilling fluid; polyethylene glycol; kinetic inhibitor
Categories
Funding
- Project 863 [2006AA09Z316]
- National Natural Science Foundation of China [40974071, 50704028, 50904053]
- Program for New Century Excellent Talents in University [NCET-05-0663]
- Graduate Academic Research and Innovation Foundation of CUG [CUGYJS0803]
- Fundamental Research Funds for the Central Universities [CUGL100410]
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Shale inhibition, low-temperature performance, the ability to prevent calcium and magnesium-ion pollution, and hydrate inhibition of polyethylene glycol drilling fluid were each tested with conventional drilling-fluid test equipment and an experimental gas-hydrate integrated simulation system developed by our laboratory. The results of these tests show that drilling fluid with a formulation of artificial seawater, 3% bentonite, 0.3% Na2CO3, 10% polyethylene glycol, 20% NaCl, 4% SMP-2, 1% LV-PAC, 0.5% NaOH and 1% PVP K-90 performs well in shale swelling and gas hydrate inhibition. It also shows satisfactory rheological properties and lubrication at temperature ranges from -8 degrees C to 15 degrees C. The PVP K-90, a kinetic hydrate inhibitor, can effectively inhibit gas hydrate aggregations at a dose of 1 wt%. This finding demonstrates that a drilling fluid with a high addition of NaCl and a low addition of PVP K-90 is suitable for drilling in natural marine gas-hydrate-bearing sediments.
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