Method for inhibiting or controlling inorganic scale...

Details Method for inhibiting or controlling inorganic scale... Method for inhibiting or controlling inorganic scale...

2008-07-15

2008-07-15

Suchfield, George (Department: 3676)

Wells

Processes

Material placed in pores of formation to treat resident...

C166S307000, C166S308200, C166S310000, C166S312000, C507S222000, C507S224000, C507S225000, C507S229000, C507S242000, C507S243000, C507S244000, C507S927000

Reexamination Certificate

active

07398824

ABSTRACT:
A formulation containing a copolymer derived from a cationic monomer effectively inhibits and controls the formation of inorganic scales. Suitable copolymers include those comprising an acrylamide unit and a quaternary ammonium salt group, and optionally an acrylate and/or nitrogen heterocyclic monomer including those wherein the quaternary ammonium salt is a unit of the formula:wherein R is methyl or hydrogen; R4is a C1to C6alkyl group, optionally substituted with halogen, hydroxyl and alkoxy groups, X is halogen; and R1, R2and R3are independently selected from the group consisting of alkyl and alkoxy groups. Suitable nitrogen heterocyclic compounds include N-vinylpyrrolidone, N-vinylformamide, N-vinylacetamide, N-vinylcaprolactam, N-vinylimidazole and N-vinylpyridine. The copolymers have particular applicability in the control and inhibition of zinc sulfide or iron sulfide scales, typically formed when zinc bromide brines are used as fluids in the treatment of a gas or oil well, such as a completion fluid.

REFERENCES:
patent: 3744566 (1973-07-01), Szabo et al.
patent: 4532052 (1985-07-01), Weaver et al.
patent: 4536303 (1985-08-01), Borchardt
patent: 4630679 (1986-12-01), Reeves, III et al.
patent: 4762626 (1988-08-01), Emmons et al.
patent: 5213691 (1993-05-01), Emmons et al.
patent: 5224543 (1993-07-01), Watkins et al.
patent: 5282976 (1994-02-01), Yeung
patent: 5342530 (1994-08-01), Aften et al.
patent: 5342540 (1994-08-01), Perez
patent: 5465792 (1995-11-01), Dawson et al.
patent: 6090773 (2000-07-01), Lukenbach et al.
patent: 6123159 (2000-09-01), Brookey et al.
patent: 6787506 (2004-09-01), Blair et al.
patent: 6855672 (2005-02-01), Poelker et al.
patent: 7159655 (2007-01-01), Ke et al.
patent: 7192907 (2007-03-01), Patel
patent: 7270180 (2007-09-01), Ke et al.
patent: 2005/0215439 (2005-09-01), Blair
Fernández, I.J., “Evaluation of Cationic Water-Soluable Polymers with Improved Thermal Stability” Presented at the SPE International Symposium on Oilfield Chemistry, Houston, TX, Feb. 2-4, 2005 (SPE 93003).
Graham, G.M., et al., “The Impact of Dissolved Iron . . . ” Presented at the SPE International Symposium on Oilfield Chemistry, Houston, TX, Feb. 5-7, 2003 (SPE 80254).
Graham, G.M., et al., “The Importance of Appropriate Laboratory Procedure . . . ” Presented at the SPE Oilfield Scale Symposium, Aberdeen, U.K., Jan. 30-31, 2002 (SPE 74679).
Graham, G.M., et al., “Occurance, Prediction and Prevention of Zinc Sulfide Scale . . . ” Presented at the SPE Third International Symposium on Oilfield Scale, Aberdeen, U.K., Jan. 30-31, 2001 (SPE 68317).

Affiliated with

Also associated with

Rating

Method for inhibiting or controlling inorganic scale... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for inhibiting or controlling inorganic scale..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for inhibiting or controlling inorganic scale... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2812590