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US 11,959,017 B1Granted
Methods and materials for wellbore fluid diversion using visco-elastic surfactants
AssigneesSaudi Arabian Oil Company, King Fahd University of Petroleum and Minerals
InventorsRajendra Arunkumar Kalgaonkar, Mohammed Abudullah Bataweel, Nour Othman Baqader, Nisar Ullah, Muhammad Mansha
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Abstract
A diverter agent includes a morpholinium based zwitterionic surfactant having a sulfonate terminal moiety; and an ammonium based zwitterionic surfactant.
Claims10
A diverter agent, comprising:
- a surfactant composition, comprising:
- a morpholinium based zwitterionic surfactant including a sulfonate terminal moiety having formula (I):
- wherein R1 and R2 are alkyl groups that are the same or different having from 1 to 10 carbons and sulfonate terminal moieties, and
- an ammonium based zwitterionic surfactant having formula (II):
- wherein R3 is an alkyl group having from 1 to 4 carbons with a sulfonate terminal moiety or a carboxylate terminal moiety,
- wherein R4 and R5 are alkyl groups that are the same or different having from 1 to 10 carbons,
- wherein X is an integer from 15 to 27;
- and
- an activator selected from the group consisting of calcium chloride, sodium chloride, potassium chloride, magnesium chloride, and combinations thereof,
- wherein the diverter agent is a gel,
- wherein the diverter agent has a viscosity of at least 80 cP at a shear rate of 100 l/s at a temperature up to 150° F.
8 more elements
A diverter fluid, comprising:
- a base fluid;
- an organic solvent
- a morpholinium based zwitterionic surfactant including a sulfonate terminal moiety having formula (I):
- wherein R1 and R2 are alkyl groups that are the same or different having from 1 to 10 carbons and sulfonate terminal moieties, and
- an ammonium based zwitterionic surfactant having formula (II):
- wherein R3 is an alkyl group having from 1 to 4 carbons with a sulfonate terminal moiety or a carboxylate terminal moiety,
- wherein R4 and R5 are alkyl groups that are the same or different having from 1 to 10 carbons,
- wherein X is an integer from 15 to 27;
- and
- an activator selected from the group consisting of calcium chloride, sodium chloride, potassium chloride, magnesium chloride, and combinations thereof;
- wherein the morpholinium based zwitterionic surfactant including a sulfonate terminal moiety and the ammonium based zwitterionic surfactant are thermally stable from about 20° C. to about 350° C.,
- wherein the diverter fluid is a gel,
- wherein the diverter fluid has a viscosity of at least 80 cP at a shear rate of 100 l/s at a temperature up to 150° F.
10 more elements
Dependencies are inferred from the claim text.