Polyvinyl alcohol compound drilling fluid for natural gas hydrate (NGH) reservoir in frozen soil area
A polyvinyl alcohol and drilling fluid technology, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problem of not considering the use of complex hydrate inhibitors, avoid serious pore size enlargement, and achieve good rheological properties. , the effect of preventing catheter blockage
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Embodiment 1
[0040] Embodiment 1, the content of each component in the drilling fluid is: polyvinyl alcohol mass ratio is 2.8%, sodium chloride mass ratio is 4.5%, methanol mass ratio is 4.5%, ethylene glycol mass ratio is 19%, sulfonated phenolic The mass ratio of resin SMP-2 is 1.8%, 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 phenyl ether is 0.8%, polyethylene The mass ratio of methyl ether is 0.8%, and the remaining components are water for preparation.
Embodiment 2
[0041] Embodiment 2, the content of each component in the drilling fluid is: polyvinyl alcohol mass ratio is 3%, sodium chloride mass ratio is 5%, methanol mass ratio is 5%, ethylene glycol mass ratio is 20%, sulfonated phenolic The mass ratio of resin SMP-2 is 2%, 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 phenyl ether is 1%, polyethylene The mass ratio of methyl ether is 1%, and the remaining components are water for preparation.
Embodiment 3
[0042] Embodiment three, the content of each component in the drilling fluid is: polyvinyl alcohol mass ratio is 3.2%, sodium chloride mass ratio is 5.5%, methanol mass ratio is 5.5%, ethylene glycol mass ratio is 21%, sulfonated phenolic The mass ratio of resin SMP-2 is 2.2%, 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 phenyl ether is 1.2%, polyethylene The mass ratio of methyl ether is 1.2%, and the remaining components are water for preparation.
[0043] 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:
[0044] 1 Evaluation of drilling fluid shale hydration inhibition
[0045] Inhibition evaluation experiment is an important part of the indoor evaluation of drilling fluid related performance. The present...
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