Drilling fluid for natural gas hydrate (NGH) reservoir in siltstone
A drilling fluid and natural gas technology, applied in the field of drilling fluid, can solve problems such as easy collapse and fracturing of the well wall, increase of formation collapse pressure, increase of well wall penetration, etc., to avoid serious expansion of pore diameter, strong shale suppression ability, and suppression and the effect of reducing the solid phase
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Embodiment 1
[0036] Embodiment 1, the content of each component in the drilling fluid is: the mass ratio of sodium formate is 2.8%, the mass ratio of sodium chloride is 9%, the mass ratio of ethylene glycol is 9%, the mass ratio of potassium chloride is 4.5%, the low viscosity carboxylate The mass ratio of methylcellulose LV-CMC is 1.8%, the mass ratio of potassium polyacrylate is 1.8%, the mass ratio of xanthan gum is 0.4%, the mass ratio of polyvinylpyrrolidone K90 is 0.8%, and the mass ratio of propylene glycol monomethyl ether is 0.8% , The mass ratio of polyvinyl methyl ether is 0.8%, and the remaining components are prepared water.
Embodiment 2
[0037] Embodiment 2, 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 10%, the mass ratio of ethylene glycol is 10%, the mass ratio of potassium chloride is 5%, and the low-viscosity carboxylate The mass ratio of methylcellulose LV-CMC is 2%, the mass ratio of potassium polyacrylate is 2%, the mass ratio of xanthan gum is 0.5%, the mass ratio of polyvinylpyrrolidone K90 is 1%, and the mass ratio of propylene glycol monomethyl ether is 1%. 1. The mass ratio of polyvinyl methyl ether 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 11%, the mass ratio of ethylene glycol is 11%, the mass ratio of potassium chloride is 5.5%, and the low-viscosity carboxyl The mass ratio of methylcellulose LV-CMC is 2.2%, the mass ratio of potassium polyacrylate is 2.2%, the mass ratio of xanthan gum is 0.6%, the mass ratio of polyvinylpyrrolidone K90 is 1.2%, and the mass ratio of propylene glycol monomethyl ether is 1.2%. 1. The mass ratio of polyvinyl methyl ether 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 the ind...
PUM
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