Marine facies natural gas hydrate storage compound drilling fluid
A drilling fluid and natural gas technology, applied in the field of natural gas hydrate exploitation, can solve problems such as temperature and pressure conditions damage, formation collapse pressure increase, well wall easy collapse and fracturing, etc., to reduce and prevent repeated fragmentation, and reduce formation leakage The degree of avoiding the effect of severely expanding the aperture
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Embodiment 1
[0036] Embodiment 1, the contents of each component in the drilling fluid are: the mass ratio of sodium formate is 2.8%, the mass ratio of sodium chloride is 4.5%, the mass ratio of methanol is 4.5%, the mass ratio of ethylene glycol is 14%, and the mass ratio of potassium chloride is 14%. 4.5%, low viscosity carboxymethylcellulose LV-CMC mass ratio of 1.8%, potassium humate mass ratio of 1.8%, xanthan gum mass ratio of 0.4%, polyvinyl caprolactam mass ratio of 0.8%, propylene glycol The mass ratio of phenylene ether is 0.8%, the mass ratio of tetra-n-hexyltrimethylammonium bromide is 0.8%, and the remaining components are prepared water.
Embodiment 2
[0037] Embodiment two, the contents of each component in the drilling fluid are: the mass ratio of sodium formate is 3%, the mass ratio of sodium chloride is 5%, the mass ratio of methanol is 5%, the mass ratio of ethylene glycol is 15%, and the mass ratio of potassium chloride is 5%. 5%, low-viscosity carboxymethylcellulose LV-CMC mass ratio of 2%, potassium humate mass ratio of 2%, xanthan gum mass ratio of 0.5%, polyvinyl caprolactam mass ratio of 1%, propylene glycol The mass ratio of phenylene ether is 1%, the mass ratio of tetra-n-hexyltrimethylammonium bromide is 1%, and the remaining components are prepared water.
Embodiment 3
[0038] Embodiment three, the contents of each component in the drilling fluid are: the mass ratio of sodium formate is 3.2%, the mass ratio of sodium chloride is 5.5%, the mass ratio of methanol is 5.5%, the mass ratio of ethylene glycol is 16%, and the mass ratio of potassium chloride is 16%. 5.5%, low viscosity carboxymethyl cellulose LV-CMC mass ratio is 2.2%, potassium humate mass ratio is 2.2%, xanthan gum mass ratio is 0.6%, polyvinyl caprolactam mass ratio is 1.2%, propylene glycol The mass ratio of phenylene ether is 1.2%, the mass ratio of tetra-n-hexyltrimethylammonium bromide is 1.2%, and the remaining components are prepared water.
[0039] The drilling fluid configuration methods of the above-mentioned examples 1, 2, and 3 are conventional drilling fluid configuration methods, and are evaluated by the following experimental methods:
[0040] 1 Evaluation of drilling fluid shale hydration inhibition
[0041] Inhibition evaluation experiment is an important part of...
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