Wells – Processes – Cementing – plugging or consolidating
Patent
1995-07-06
1997-03-11
Suchfield, George A.
Wells
Processes
Cementing, plugging or consolidating
166300, 507903, 523130, E21B 33138
Patent
active
056092083
ABSTRACT:
A process and composition are provided for permeability reduction in a treatment region to improve hydrocarbon recovery from a hydrocarbon-bearing formation. The process includes placement of a crosslinked polymer gel in the treatment region preceded by surface preparation of a gelation solution which is the gel precursor. The gelation solution contains a crosslinkable polymer, a chromium(III)/carboxylate complex crosslinking agent, a carboxylate salt delaying agent and an aqueous solvent. The gel is placed in the treatment region by injecting the gelation solution into a well bore in fluid communication with the treatment region, displacing it into the desired treatment region and gelling the solution to completion forming the permeability-reducing gel in situ. The gelation rate is retarded in a controlled manner by adjusting the composition or concentration, and correspondingly the pH, of the delaying agent in the gelation solution.
REFERENCES:
patent: 3762476 (1973-10-01), Gall
patent: 4683949 (1987-08-01), Sydansk et al.
patent: 4706754 (1987-11-01), Smith
patent: 4770245 (1988-09-01), Sydansk
patent: 4917186 (1990-04-01), Mumallah
patent: 5069281 (1991-12-01), Tackett, Jr.
patent: 5131469 (1992-07-01), Lockhart et al.
patent: 5143958 (1992-09-01), Lockhard et al.
patent: 5181568 (1993-01-01), McKown et al.
patent: 5219475 (1993-06-01), Lockhart et al.
patent: 5219476 (1993-06-01), Lockhart et al.
patent: 5338465 (1994-08-01), Lockhart et al.
patent: 5421411 (1995-06-01), Sydansk
patent: 5431226 (1995-07-01), Sydansk
Lockhart et al., "A New Gelation Technology for In-Depth Placement of Cr.sup.3+ /Polymer Gels in High-Temperature Reservoirs," SPE/DOE 24194, Apr. 1992.
Lockhart et al., "Gelation-Delaying Additives for Cr.sup.3+ /Polymer Gels," SPE/DOE 25221, Mar. 1993.
Ebel Jack E.
Hummel Jack L.
Marathon Oil Company
Suchfield George A.
LandOfFree
pH dependent process for retarding the gelation rate of a polyme does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with pH dependent process for retarding the gelation rate of a polyme, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and pH dependent process for retarding the gelation rate of a polyme will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-437172