Block copolymers useful for enhanced oil recovery processes

Patent · Tue Mar 07 04:00:00 EST 1989

OSTI ID:5953689

Shu, P

A method is described for permeability control of a subterranean formation and for enhancing oil recovery from the subterranean formation. The method comprising consists of injecting an aqueous solution comprised of a block copolymer having a segment which entangles in a high brine environment to function as a physical crosslink and a segment which form a continuous non- or low degree crosslinked phase which is brine tolerant. The block copolymer has the structural form of ABA triblock or (AB)/sub n/ multiblock, wherein A is a brine sensitive polymer block capable forming entangled segments, each a polymer block being characterized by a degree of hydrolysis of over 30% and a degree of polymerization of 1,000 to 200,000, each B polymer block is a brine tolerant segment and n is a number of at least 2, each B polymer block having a degree of polymerization of 10,000 to 600,000.

• Assignee: Mobil Oil Corp., New York, NY
• Patent Number(s): US 4809782
• OSTI ID: 5953689
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030900 -- Natural Gas-- Artificial Stimulation
Plowshare-- (-1989)
AQUEOUS SOLUTIONS
BRINES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COPOLYMERS
DECOMPOSITION
DISPERSIONS
HYDROLYSIS
LYSIS
MIXTURES
NATURAL GAS WELLS
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PERMEABILITY
PLUGGING
PLUGGING AGENTS
POLYMERIZATION
POLYMERS
RESERVOIR ROCK
SOLUTIONS
SOLVOLYSIS
STIMULATION
WELL STIMULATION
WELLS