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US 2023/0265335 A1Published application
Delayed Gelation Polymer System For High Temperature and High Salinity Applications
AssigneesCNPC USA Corporation, Beijing Huamei, Inc., China National Petroleum Corporation
InventorsMeng Lu, Danhua Zhang, Fuchen Liu, Nancy Zhou, Jianshen Li, Weibin Zha
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Abstract
This disclosure describes the composition and methods of use for a novel delayed polymer gelation system for high temperature and high salinity applications. This polymer gelation system includes a polymer of acrylamide, AMPS and 500-5000 ppm polyethylene glycol diacrylate in inverse emulsion form, and a polyethyleneimine (PEI) with a MW of 2,000-30,000 daltons as the crosslinking agent.
Claims20
A polymer system comprising:
- a polymer comprising:
- acrylamide;
- 2-acrylamido-2-methylpropane sulfonic acid (AMPS);
- polyethylene glycol diacrylate;
- and
- sodium formate;
- a crosslinker comprising polyethyleneimine;
- and
- a temperature stabilizer;
- wherein the polymer is in inverse emulsion form.
7 more elements
A method of improving sweep efficiency for an oil-bearing zone comprising:
- preparing a polymer system comprising:
- a polymer comprising:
- acrylamide;
- 2-acrylamido-2-methylpropane sulfonic acid (AMPS);
- polyethylene glycol diacrylate;
- and
- sodium formate;
- a crosslinker comprising polyethyleneimine;
- and
- a temperature stabilizer;
- wherein the polymer is in inverse emulsion form;
- and
- injecting the polymer system into a wellbore to improve the sweep efficiency.
10 more elements
Dependencies are inferred from the claim text.