Use of mgda as additive in processes for recovering crude oil and/or gas from subterranean formations
AssigneeBASF SE
InventorsJennifer JACKSON, Stefan FRENZEL, Oscar LAFUENTE CERDA
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Abstract
Use of methyl glycine diacetic acid (MGDA) as additive in processes for recovering crude oil and/or gas from subterranean formations, wherein the MGDA is a mixture of L- and D-enantiomers of MGDA or salts thereof, said mixture containing an excess of the respective L-isomer, and the enantiomeric excess (ee) of the L-isomer is in the range of from 10% to 75% Preferably, the process is a processes of acidizing subterranean formations.
Claims24
-23. (canceled)
A process for recovering crude oil and/or gas from subterranean formations which comprises adding methyl glycine diatetic acid (MGDA) as additive to the subterranean formulations, wherein the MGDA is a mixture of L- and D-enantiomers of MGDA or its respective mono-, di or trialkali metal or mono-, di- or triammonium salts, said mixture containing an excess of the respective L-isomer, wherein the enantiomeric excess (ee) of the L-isomer is in the range of from 10% to 75%.
A mixture of L and D-enantiomers of molecules of general formula (II)
- [CH3—CH(COO)—N(CH2—COO)2]M3-yHy (II),
- wherein y is in the range of from 0.75 to 2.9, M is selected from substituted or non-substituted ammonium, potassium and sodium or mixtures thereof, said mixture containing an excess of the respective L-isomer, wherein the enantiomeric excess (ee) is in the range of from 10 to 75%.
Dependencies are inferred from the claim text.