Wells – Processes – Graveling or filter forming
Reexamination Certificate
2007-05-22
2007-05-22
Suchfield, George (Department: 3676)
Wells
Processes
Graveling or filter forming
C166S280100, C166S283000, C166S300000, C166S308200, C166S308300, C507S260000, C507S265000, C507S267000, C507S269000, C507S902000
Reexamination Certificate
active
11159023
ABSTRACT:
A method is given for treating a subterranean formation penetrated by a wellbore with a viscosified fluid. The fluid contains a solid hydrolysable polyacid that upon dissolution and hydrolysis releases an acid that is a breaker for the viscosifying system. Suitable solid hydrolysable polyacids include polylactic acid and polyglycolic acid. The fluid also contains a pH control agent, present in an amount sufficient to neutralize any acid present in the solid hydrolysable polyacid before the injection and to neutralize any acid generated by the solid hydrolysable polyacid during the injection, so that the acid breaker is not available to break the fluid during the injection. In one embodiment the viscosifier is a viscoelastic surfactant fluid system and the solid hydrolysable polyacid is of a size selected to be a fluid loss additive, for example in fracturing or gravel packing. In another embodiment, the solid hydrolysable polyacid is used in particles sufficiently small that they enter the pores of the formation. In either case, the viscosifier is broken after the solid releases more acid than can be neutralized by the pH control agent.
REFERENCES:
patent: 3353600 (1967-11-01), Annis et al.
patent: 4715967 (1987-12-01), Bellis et al.
patent: 4848467 (1989-07-01), Cantu et al.
patent: 4957165 (1990-09-01), Cantu et al.
patent: 4986355 (1991-01-01), Casad et al.
patent: 5330005 (1994-07-01), Card et al.
patent: 5439055 (1995-08-01), Card et al.
patent: 5501275 (1996-03-01), Card et al.
patent: 5551516 (1996-09-01), Norman et al.
patent: 5782300 (1998-07-01), James et al.
patent: 5939453 (1999-08-01), Heller et al.
patent: 5964295 (1999-10-01), Brown et al.
patent: 5979555 (1999-11-01), Gadberry et al.
patent: 5979557 (1999-11-01), Card et al.
patent: 6035936 (2000-03-01), Whalen
patent: 6140277 (2000-10-01), Tibbles et al.
patent: 6258859 (2001-07-01), Dahayanake et al.
patent: 6509301 (2003-01-01), Vollmer
patent: 6713807 (2004-03-01), Weimer et al.
patent: 6828280 (2004-12-01), England et al.
patent: 6837309 (2005-01-01), Boney et al.
patent: 6881709 (2005-04-01), Nelson et al.
patent: 6908888 (2005-06-01), Lee et al.
patent: 6929070 (2005-08-01), Fu et al.
patent: 6938693 (2005-09-01), Boney et al.
patent: 7008908 (2006-03-01), Chan et al.
patent: 7028775 (2006-04-01), Fu et al.
patent: 7066260 (2006-06-01), Sullivan et al.
patent: 7115546 (2006-10-01), Qu et al.
patent: 7144844 (2006-12-01), Qu et al.
patent: 7166560 (2007-01-01), Still et al.
patent: 2003/0060374 (2003-03-01), Cooke, Jr.
patent: 2003/0062160 (2003-04-01), Boney et al.
patent: 2003/0106690 (2003-06-01), Boney et al.
patent: 2003/0134751 (2003-07-01), Lee et al.
patent: 2004/0094300 (2004-05-01), Sullivan et al.
patent: 2004/0094301 (2004-05-01), Hughes et al.
patent: 2004/0106525 (2004-06-01), Willberg et al.
patent: 2004/0152601 (2004-08-01), Still et al.
patent: 2004/0216876 (2004-11-01), Lee et al.
patent: 2004/0221989 (2004-11-01), Zhou et al.
patent: 2005/0034865 (2005-02-01), Todd et al.
patent: 2005/0059558 (2005-03-01), Blauch et al.
patent: 2005/0107265 (2005-05-01), Sullivan et al.
patent: 2005/0161220 (2005-07-01), Todd et al.
patent: 2007/0032386 (2007-02-01), Abad et al.
patent: 03/023177 (2003-03-01), None
patent: 2004/037946 (2004-05-01), None
patent: 2004/038176 (2004-05-01), None
patent: 2005/028587 (2005-03-01), None
SPE18211-Laboratory and Field Evaluation of a Combined Fluid-Loss-Control Additive and Gel Breaker for Fracturing FluidsBy Lisa A. Cantu and Phil A. Boyd.
SPE68977-Visual Observation of Produced Water Re-Injection Under Laboratory ConditionsBy F.A.H. Al-Abduwani, W.M.G.T. van den Broek and P.K. Currie.
SPE24844—Fracturing Unconsolidated Sand Formations Offshore Gulf of MexicoBy F.L. Monus, F.W. Broussard, J.A. Ayoub and W.D.Norman.
M. Economides and K. Nolte, eds.,Reservoir Stimulation, 3rdedition, John Wiley & Sons, Ltd, New York (2000) pp. 10-21 to 10-24.
Brown J Ernest
Lee Jesse C.
Salamat Golchehreh
Sullivan Philip F.
Cate David
Fonseca Darla
Mitchell Thomas O.
Schlumberger Technology Corporation
Suchfield George
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