Silty mudstone natural gas hydrate storage compound type drilling fluid
A drilling fluid and natural gas technology, applied in the field of natural gas hydrate exploitation, can solve the problems of temperature and pressure condition damage, easy collapse and fracturing of wellbore, increase of drilling fluid viscosity, etc., to reduce and prevent repeated breakage and avoid serious enlargement of pore diameter , the effect of good low temperature stability
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Embodiment 1
[0037] Embodiment 1, the content of each component in the drilling fluid is: the mass ratio of polyethylene glycol is 2.8%, the mass ratio of sodium chloride is 8%, the mass ratio of ethylene glycol is 14%, the mass ratio of potassium chloride is 4.5%, The mass ratio of potassium humate 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 polyvinyl caprolactam is 0.8%, the mass ratio of polyvinyl methyl ether is 0.8%, The mass ratio of tetra-n-hexyltrimethylammonium bromide is 0.8%, and the remaining components are preparation water.
Embodiment 2
[0038] Embodiment 2, the content of each component in the drilling fluid is: the mass ratio of polyethylene glycol is 3%, the mass ratio of sodium chloride is 10%, the mass ratio of ethylene glycol is 15%, the mass ratio of potassium chloride is 5%, The mass ratio of potassium humate is 2%, the mass ratio of potassium polyacrylate is 2%, the mass ratio of xanthan gum is 0.5%, the mass ratio of polyvinyl caprolactam is 1%, the mass ratio of polyvinyl methyl ether is 1%, The mass ratio of tetra-n-hexyltrimethylammonium bromide is 1%, and the remaining components are preparation water.
Embodiment 3
[0039] Embodiment three, the content of each component in the drilling fluid is: the mass ratio of polyethylene glycol is 3.2%, the mass ratio of sodium chloride is 12%, the mass ratio of ethylene glycol is 16%, the mass ratio of potassium chloride is 5.5%, The mass ratio of potassium humate 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 polyvinyl caprolactam is 1.2%, the mass ratio of polyvinyl methyl ether is 1.2%, The mass ratio of tetra-n-hexyltrimethylammonium bromide is 1.2%, and the remaining components are preparation water.
[0040] 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:
[0041] 1 Evaluation of drilling fluid shale hydration inhibition
[0042] Inhibition evaluation experiment is an important part of the indoor evaluation of drilling fluid rel...
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