Method and device for reducing viscosity of shaft applicable to extremely-viscous oil recovery
A viscosity-reducing and wellbore technology, applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., can solve the problems of imperfect process conditions and poor performance of viscosity-reducing agents, saving thin oil rate and reducing production. cost effect
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[0034] The present invention is applied to the TH12329 mechanically pumped well of Tahe Oilfield to carry out the field test of viscous reduction of heavy oil. The solution of SDG-2 composite viscosity reducer (publication number CN102604621A) developed by China University of Petroleum (Beijing) is housed in the drug storage tank 1.
[0035] The preparation steps of this viscosity reducer are:
[0036] (1) Preparation of oil-soluble viscosity reducer:
[0037] Mixed aromatics (50% by mass): toluene, ethylbenzene (1:1)
[0038] Alcohols (50% by mass): ethanol, octanol, pentanol (1:1:1);
[0039] Preparation method: Mix the above components at normal temperature and pressure, and stir to obtain.
[0040] (2) Preparation of water-soluble viscosity reducer
[0041] Fatty alcohol ether carboxylate is: CH 3 (CH 2 ) 8 O(CH 2 CH 2 O) 8 CH 2 COONa.
[0042] Preparation:
[0043] Add 0.1mol structural formula to the reactor AEOs 8 , under strong stirring and slight heat...
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