Compound drilling fluid applied to deposit of natural gas hydrates in seafloor
A drilling fluid and hydrate technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of fracture pressure reduction, temperature and pressure condition damage, easy wall collapse and fracturing, etc., to achieve hydrate formation Inhibition effect enhances, reduces and prevents repeated crushing, and avoids the effect of severely expanding the pore size
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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 methanol is 4.5%, the mass ratio of ethylene glycol is 14%, the mass ratio of humic The mass ratio of potassium acid potassium 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 phenyl ether is 0.8%, and the mass ratio of polyvinyl methyl ether is 0.8%. Divided into prepared water.
Embodiment 2
[0035] Embodiment 2, the content of each component in the drilling fluid is: the mass ratio of polyethylene glycol is 6%, the mass ratio of sodium chloride is 10%, the mass ratio of methanol is 5%, the mass ratio of ethylene glycol is 15%, the mass ratio of humic The mass ratio of potassium acid potassium 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 phenyl ether is 1%, and the mass ratio of polyvinyl methyl ether is 1%. Divided into prepared water.
Embodiment 3
[0036] Embodiment three, the content of each component in the drilling fluid is: the mass ratio of polyethylene glycol is 7%, the mass ratio of sodium chloride is 11%, the mass ratio of methanol is 5.5%, the mass ratio of ethylene glycol is 16%, the mass ratio of humic The mass ratio of potassium acid potassium 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 phenyl ether is 1.2%, and the mass ratio of polyvinyl methyl ether is 1.2%. Divided into prepared 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 shal...
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