Drilling fluid applicable to seabed natural gas hydrate storage
A drilling fluid and hydrate technology, applied in the field of drilling fluid, can solve the problems of reduced fracture pressure, damaged temperature and pressure conditions, easy wall collapse and fracturing, etc., so as to improve the inhibition effect of hydrate formation, reduce and prevent repeated crushing , to avoid the effect of serious expansion of aperture
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Embodiment 1
[0034] Embodiment 1, the content of each component in the drilling fluid is: the mass ratio of polyethylene glycol is 5%, the mass ratio of sodium chloride is 9%, 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 xanthan gum is 0.4%, the mass ratio of polyvinylpyrrolidone K90 is 0.8%, the mass ratio of propylene glycol monomethyl ether is 0.8%, and the mass ratio of polyvinyl methyl ether is 0.8%. , and the remaining components are the preparation water.
Embodiment 2
[0035] Embodiment 2, the content of each component in the drilling fluid is: polyethylene glycol mass ratio is 6%, sodium chloride mass ratio is 10%, ethylene glycol mass ratio is 15%, potassium chloride mass ratio is 5%, The mass ratio of potassium humate is 2%, the mass ratio of xanthan gum is 0.5%, the mass ratio of polyvinylpyrrolidone K90 is 1%, the mass ratio of propylene glycol monomethyl ether is 1%, and the mass ratio of polyvinyl methyl ether is 1%. , and the remaining components are the preparation water.
Embodiment 3
[0036] Embodiment three, the content of each component in the drilling fluid is: polyethylene glycol mass ratio is 7%, sodium chloride mass ratio is 11%, ethylene glycol mass ratio is 16%, potassium chloride mass ratio is 5.5%, The mass ratio of potassium humate is 2.2%, the mass ratio of xanthan gum is 0.6%, the mass ratio of polyvinylpyrrolidone K90 is 1.2%, the mass ratio of propylene glycol monomethyl ether is 1.2%, and the mass ratio of polyvinyl methyl ether is 1.2%. , and the remaining components are the preparation water.
[0037] 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:
[0038] 1 Evaluation of drilling fluid shale hydration inhibition
[0039] Inhibition evaluation experiment is an important part of the indoor evaluation of drilling fluid related performance. The present invention adopts mud shale expansion inhib...
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