Polyethylene glycol drilling fluid for drilling in marine gas hydrates-bearing sediments: An experimental study

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Abstract

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% Na 2CO 3, 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 ° C to 15 ° 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.

Figures

  • Figure 1. Schematic diagram of the experimental gas-hydrate integrated simulation system.
  • Table 1. The results of the shale expansion experiments.
  • Figure 2. The shale expansion in the pure water and the drilling fluid.
  • Table 2. The rheological properties of polyethylene-glycol drilling fluid at different temperatures.
  • Figure 3. The change of gel strength and yield point of polyethylene glycol drilling fluid at different temperatures.
  • Table 3. Experiment for preventing pollution by calcium and magnesium ions.
  • Figure 4. The contrast of temperature and pressure evolution of polyethylene glycol drilling fluid with and without the addition of PVP K-90 (a) in absence of PVP and (b) in presence of PVP.
  • Table 4. The rheological properties of polyethylene-glycol drilling fluid with different PVP K-90 concentration.

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CITATION STYLE

APA

Jiang, G., Liu, T., Ning, F., Tu, Y., Zhang, L., Yu, Y., & Kuang, L. (2011). Polyethylene glycol drilling fluid for drilling in marine gas hydrates-bearing sediments: An experimental study. Energies, 4(1), 140–150. https://doi.org/10.3390/en4010140

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