Well cementing methods and compositions.

摘要

1. A set retarded cement composition for cementing high temperature zones in wells, comprising: hydraulic cement; sufficient water to form a pumpable slurry; and an effective amount of one or more methylene phosphonic acid derivative retarders selected from: (a) compounds having the general formula: <CHEM> wherein: R1, R2 and R3 are independently hydrogen, -CH2PO3(X)2 or -CH2CH2-O-PO3(X)2 with the limitation that one of R1, R2 and R3 is always -CH2PO3(X)2 or -CH2CH2-O-PO3(X)2; X is hydrogen, an alkali metal cation, ammonium, a protonated amine or an alkaline earth metal cation in which case there is only one X per methylene phosphonate group; and at least one X is hydrogen which is associated with the nitrogen atom by way of an intramolecular hydrogen bond between the nitrogen atom and an oxygen atom attached to a phosphorus atom; (b) compounds having the structural formula: <CHEM> wherein: n is an integer from 1 to 4; R1 is hydrogen or -CH2PO3(X)2; R2 is hydrogen, -CH2PO3(X)2 or -CH2CH2N(R3)2 wherein R3 is hydrogen or -CH2PO3(X)2; X is hydrogen, an alkali metal cation, ammonium, a protonated amine or an alkaline earth metal cation in which case there is only one X per methylene phosphonate group; and at least one of R1, R2 or R3 is -CH2PO3(X)2 and one of X is hydrogen which is associated with a nitrogen atom by way of an intramolecular hydrogen bond between the nitrogen atom and an oxygen bond between the nitrogen atom and an oxygen atom attached to a phosphorus atom; (c) compounds having the structural formula: <CHEM> wherein: n is an integer from 0 to 4; R1 is hydrogen or -CH2PO3(X)2; R2 is hydrogen, -CH2PO3(X)2 or -CH2CH2N(R4)2 wherein R4 is hydrogen or-CH2PO3(X)2; R3 is -N(R5)2 or <CHEM> wherein R5 is hydrogen or -CH2PO3(X)2; X is hydrogen, an alkali metal cation, ammonium, a protonated amine or an alkali earth metal cation in which case there is only one X per methylene phosphonate group; and at least one of R1, R2 or R3 is -CH2PO3(X)2 and one of X is hydrogen which is associated with a nitrogen atom by way of an intramolecular hydrogen bond between the nitrogen atom and an oxygen atom to a phosphorus atom; (d) compounds having the structural formula: <CHEM> or <CHEM> wherein: n is an integer from 2 to 6; R is hydrogen, -CH2PO3(X)2 or -CH2CH2N(R1)2 wherein R1 is hydrogen or -CH2PO3(X)2; X is hydrogen, an alkali metal cation, ammonium, a protonated amine or an alkaline earth metal cation in which case there is only one X per methylene phosphonate group; and at least one R is -CH2PO3(X)2 and one X is hydrogen which is associated with a nitrogen atom by way of an intramolecular hydrogen bond between the nitrogen atom and an oxygen atom attached to a phosphorus atom; (e) compounds having the structural formula: <CHEM> or <CHEM> wherein: R1 is hydrogen or -CH3; R2 is -CH2PO3(X)2 -CH2NHCH2PO3(X)2; X is hydrogen, an alkali metal action, ammonium, a protonated amine or an alkaline earth metal cation in which case there is only one X per methylene phosphonate group; and when nitrogen is present, at least one X is hydrogen which is associated with the nitrogen atom by way of an intramolecular hydrogen bond between the nitrogen atom and an oxygen atom attached to a phosphorus atom. The compositions may also further comprise a hydratable gel-forming material.