If there is any conflict in the usages ofa word or term in this  disclosure and one or more patent(s) or other documents that 60  may be incorporated by reference, the definitions that are  consistent with this specification should be adopted.  The words "comprising," "containing," "including," "hav› ing," and all granimatical variations thereof are intended to  have an open, non-limiting meaning. For example, a compo- sition comprising a component does not exclude it from hav› ing additional components, an apparatus comprising a part  The words or terms used herein have their plain, ordinary  meaning in the field of this disclosure, except to the extent  explicitly and clearly defined in this disclosure.  Interpretation  (iii) a water-soluble polymer having at least one functional  group that can be crosslinked with aluminum(III);  (iv) a water-soluble aluminum carboxylate; and  (iv) a complexation agent for calcium ions;  wherein the pH of the treatment fluid is less than the pH  required for the aluminum to crosslink the polymer to form a  crosslinked gel.  According to another embodiment of the invention, a  method of treating a zone of a subterranean carbonate forma› tion penetrated by a wellbore is provided, the method includ- ing the steps of:  (a) forming a treatment fluid comprising:  (i) water;  (ii) a strong acid;  (iii) a water-soluble polymer having at least one functional  group that can be crosslinked with aluminum(III);  wherein the pH of the treatment fluid is less than the pH  required for the aluminum to crosslink the polymer to  form a crosslinked gel;  (iv) a water-soluble aluminum carboxylate; and  (v) a complexation agent for calcium ions;  (b) introducing the treatment fluid through the well bore  into the zone; and  ( c) allowing time for the strong acid in the treatment fluid  to spend in the formation such that the pH of the fluid  increases sufficiently for the aluminum to crosslink the poly› mer, thereby forming a crosslinked gel in the zone.  The method can be used in acidizing treatments, including,  for example, in acid fracturing or matrix acidizing.  Preferably, the method includes the step of allowing time  for the strong acid and any other acids in the previously› introduced treatment fluid to spend against the formation  such that the pH increases sufficiently to break the  crosslinked gel.  Although the methods have been described here for, and  are most typically used for, hydrocarbon production, they  may also be used in storage wells and injection wells, and for  production of other fluids, such as water or brine.  These and other aspects of the invention will be apparent to  one skilled in the art upon reading the following detailed  description. While the invention is susceptible to various  modifications and alternative forms, specific embodiments  thereof will be described in detail and shown by way of  example. It should be understood, however, that it is not  intended to limit the invention to the particular forms dis- closed, but, on the contrary, the invention is to cover all  modifications and alternatives falling within the spirit and  scope of the invention as expressed in the appended claims.  DETAILED DESCRIPTION OF PRESENTLY  PREFERRED EMBODIMENTS  Definitions and Usages  A "well" includes a wellhead and at least one wellbore  from the wellhead penetrating the earth. The "wellhead" is  Well Terms  Limestone is essentially calcium carbonate. Dolomite is  essentially a combination of calcium carbonate and magne› sium carbonate, wherein at least 50% of the cations are mag› nesium. As used herein, a carbonate formation is at least 50%  by weight calcium carbonate, magnesium carbonate, or a  combination thereof.  As used herein, a subterranean formation having at least  50% by weight of inorganic siliceous materials ( e.g., sand› stone) is referred to as a "sandstone formation."  Sandstone, Carbonate, and Other Formations  Reservoirs can be of various rock materials.  A "subterranean formation" is a body of rock that has  sufficiently distinctive characteristics and is sufficiently con› tinuous for geologists to describe, map, and name it. A sub› terranean formation having a sufficient porosity and perme- ability to store and transmit fluids is sometimes referred to as  a "reservoir." A subterranean formation containing oil or gas  may be located under land or under the seabed off shore. Oil  and gas reservoirs are typically located in the range of a few  hundred feet ( shallow reservoirs) to a few tens of thousands of  feet (ultra-deep reservoirs) below the surface of the land or  seabed.  In the context of production from a well, oil and gas are  understood to refer to crude oil and natural gas. Oil and gas  are naturally occurring hydrocarbons in certain subterranean  formations.  Oil and Gas Reservoirs  Terms such as "first," "second," "third," etc. are assigned  arbitrarily and are merely intended to differentiate between  two or more components, parts, or steps that are otherwise  similar or corresponding in nature, structure, function, or  action. For example, the words "first" and "second" serve no  other purpose and are not part of the name or description of  the following name or descriptive terms. The mere use of the  term "first" does not require that there be any "second" simi› lar or corresponding component, part, or step. Similarly, the  mere use of the word "second" does not require that there by  any "first" or "third" similar or corresponding component,  part, or step. Further, it is to be understood that the mere use  of the term "first" does not require that the element or step be  the very first in any sequence, but merely that it is at least one  of the elements or steps. Similarly, the mere use of the terms  "first" and "second" does not necessarily require any  sequence. Accordingly, the mere use of such terms does not  exclude intervening elements or steps between the "first" and  "second" elements or steps, etc.  Whenever a numerical range of degree or measurement  with a lower limit and an upper limit is disclosed, any number  and any range falling within the range is also intended to be  specifically disclosed. For example, every range of values (in  the form "from a to b," or "from about a to about b," or "from  about a to b," "from approximately a to b," and any similar  expressions, where "a" and "b" represent numerical values of  degree or measurement) is to be understood to set forth every  number and range encompassed within the broader range of  values.  The indefinite articles "a" or "an" mean one or more than  one of the component, part, or step that the article introduces.  does not exclude it from having additional parts, and a method  having a step does not exclude it having additional steps.  When such terms are used, the compositions, apparatuses,  and methods that "consist essentially of’ or "consist of’ the  specified components, parts, and steps are specifically  included and disclosed.  US 9,399,728 B2  8  7 