Interpolymer crosslinked gel and method of using
AssigneeSchlumberger Technology Corporation
InventorsAndrey Mirakyan, Philip F. Sullivan, Richard D. Hutchins, Lijun Lin, Gary Tustin, Bruno J. Drochon
Life of this patent
Estimating the term…
Abstract
Disclosed herein is a gel comprising, polyacrylamide crosslinked with a non-metallic crosslinker, the non-metallic crosslinker comprising a polyamine. A method of making the gel and a method of using the gel are also disclosed.
Claims12
-2. (canceled)
The method of claim 19, wherein the gel has a pH of greater than or equal to about 9.
The method of claim 19, wherein the non-metallic cross linker is tetraethylenepentamine, pentaethylenehexamine, or a combination thereof.
The method of claim 19, wherein the gel has having a pH of less than or equal to about 3.
The method of claim 19, wherein the gel has a complex viscosity of greater than or equal to about 100 Pa·s at less than or equal to about 0.01 Hz.
The method of claim 19, wherein G′−G″ is greater than or equal to about 0.1 Pa·s and wherein G′ and G″ are determined using an oscillatory shear rheometer at a frequency of 1 Hz and at 20° C.
8-18. (canceled)
A method of treating a wellbore comprising:
- injecting a composition comprising greater than about 0.5 wt % polyacrylamide into a wellbore;
- injecting a composition comprising a non-metallic crosslinker comprising a polyamine having a molecular weight of less than 500 g/mol into the wellbore, and
- injecting a pH adjusting fluid into the wellbore in an amount sufficient to produce a downhole solution pH of greater than or equal to about 9 or less than or equal to about 3, to produce a gel in-situ, the in-situ gel comprising greater than or equal to about 0.5 wt % polyacrylamide crosslinked with greater than or equal to about 0.01 wt % of the non-metallic crosslinker,
- wherein the composition comprising greater than about 0.5 wt % polyacrylamide, the composition comprising a non-metallic crosslinker, and the pH adjustment fluid are injected into the wellbore separately, simultaneously, or any combination thereof.
A method of treating a wellbore comprising:
- injecting a composition comprising a gel concentrate into a wellbore, wherein the gel concentrate comprises polyacrylamide crosslinked with a non-metallic crosslinker, wherein the non-metallic crosslinker comprises a polyamine having a molecular weight of less than 500 g/mol.
(canceled)
Dependencies are inferred from the claim text.