Nitrilo-trimethyl phosphonic acid

Small amounts of pyridine bases increase the corrosion resistance of cement stone without any associated loss of strength [1016]. The use of nitrilo-trimethyl phosphonic acid and an adduct between hexamethylene tetramine and chlorinated propene or butene improves the adhesion to the metal, hardening times, mobility, and strength [ 1770]. The latter adducts are further claimed to be useful as additives in cementing oil and gas wells in salt-bearing strata [1768]. 

Nitrilo-Trimethyl Phosphonic Acid Hydrazine Hydrochloride... 

A corrosion-resistant formulation [1767] is achieved by adding phosphonic acid and hydrazine hydrochloride, as shown in Table 18-3. Hydrazine hydrochloride, combined with nitrilo-trimethyl phosphonic acid, provides a synergetic effect of increased inhibition of the plugging solution. 

Plugging Portland cement Nitrilo-trimethyl phosphonic acid Hydrazine hydrochloride Water 73.20-73.38 0.02-0.04 0.18-0.32 up to 100... 

Small amounts of phosphonium complexone [1560] are sufficient to increase adhesion to the stratal rock. Table 18-4 illustrates an example for plugging solution with Portland cement and phosphonium complexone. Calcium chloride acts as a regulator of the setting time in the suggested composition. More precisely, phosphonium complexone stands for certain chelating phosphorous compounds (e.g., oxyethylidene diphosphonic acid, nitrilo-trimethyl phosphonic acid, sodium tripolyphosphate, or amiphol) [1540]. The mixture is applicable at low temperatures from 20° to 75° C. 

Hemi-hydrated gypsum Waste obtained in production of nitrilo-trimethyl phosphonic acid [1594]... 

P. F. Tsytsymushkin, S. R. Khajrullin, A. P. Tamavskij, P. V. Kovalenko, Z. N. Kudryashova, R. M. Iskhakov, V. N. Levshin, and V. M. Sudakov. Plugging solution for oil and gas wells—contains plugging Portland cement, nitrilo-trimethyl phosphonic acid, hydrazine hydrochloride and water and has corrosion-protective properties. Patent RU 2(X)2037-C,... 

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