Well Treatment with Complexed Metal Crosslinkers
AssigneeSchlumberger Technology Corporation
InventorsAndrey Mirakyan, Michael D. Parris, Carlos Abad, Yiyan Chen
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Abstract
Disclosed are compositions and methods for treating subterranean formations, in particular, oilfield stimulation compositions and methods using polymer viscosified fluid crosslinked with metal complexes with amino and/or phosphonic acids to provide an increased crosslinking temperature and a low pH sensitivity. The metal complexes can be used with borate crosslinkers to provide continuous viscosification as the temperature is increased.
Claims27
-32. (canceled)
A method of treating a well bore penetrating a subterranean formation, the method comprising:
- mixing into an aqueous mixture a crosslinkable, hydratable polymer and a delayed crosslinking agent comprising a complex comprising:
- a metal
- a first ligand having from 3 to 40 carbon atoms, the ligand selected from the group consisting of a β-amino acid, a derivative of a β-amino acid, or a salt of a β-amino acid of the formula:
- wherein R1 and R2 are independently selected from hydrogen and hydrocarbyl optionally containing a heteroatom, or together can form a substituted or unsubstituted cycloaliphatic bridge optionally containing a heteroatom;
- wherein R3 and R4 are selected from hydrogen and hydrocarbyl, or together can form a substituted or unsubstituted cycloaliphatic bridge optionally containing a heteroatom, or wherein one of R3 and R4 and one of R1 and R2 together can form a substituted or unsubstituted cycloaliphatic bridge optionally containing a heteroatom;
- wherein R6 is hydrogen or a lone electron pair;
- and
- wherein R7 and R8 are independently selected from hydrogen and substituted or unsubstituted aliphatic hydrocarbyl, or together can form a substituted or unsubstituted cycloaliphatic bridge optionally containing a heteroatom, or wherein one of R7 and R8 and one of R1 and R2 together can form a substituted or unsubstituted cycloaliphatic bridge optionally containing a heteroatom;
- and
- a second ligand selected from the group consisting of alkanolamines, alkoxides, and α-hydroxyacid derivatives,
- injecting the aqueous mixture into the well bore;
- and
- gelling the aqueous mixture.
A method of treating a well bore penetrating a subterranean formation, the method comprising:
- mixing into an aqueous mixture a crosslinkable, hydratable polymer and a delayed crosslinking agent comprising a complex comprising:
- a Group 4 metal and
- a first ligand having from about 2 to 40 carbon atoms, the first ligand comprises a phosphono carboxylic acid of the formula:
- wherein R1 and R2 are independently selected from hydrogen and hydrocarbyl optionally containing a heteroatom, or together can form a substituted or unsubstituted cycloaliphatic bridge optionally containing a heteroatom;
- and
- m is 0 or 1 and when m is 1, R5 is substituted or unsubstituted aliphatic alkylene;
- and
- a second ligand selected from the group consisting of alkanolamines, alkoxides, and α-hydroxyacid derivatives,
- injecting the aqueous mixture into the well bore;
- and
- gelling the aqueous mixture.
Dependencies are inferred from the claim text.