SU1154222A1 - Composition for preventing salt deposition - Google Patents

Abstract

COMPOSITION FOR PREVENTION OF SALT DISTRIBUTIONS, including nitrilotrimethylphosphonic acid and carbon dioxide, characterized in that, in order to increase the degree of prevention of salt deposition and removal of corrosivity of the composition, it additionally contains sulfosilicates in the form of alkyl sulfonates C = 6 or sodium salts of the carbon-bonded carbon chrome carbon-bonded carbon chrome carbon-bonded carbon chrome carbon-bonded carbon chromium carbon-bonded carbon chrome carbon-bonded carbon chrome carbon-bonded carbon chrome carbon-bonded carbon chrome carbon-bonded carbon chrome carbon-bonded carbon chrome carbon-bonded carbon chromium carbon-bonded carbon chrome carbon-bonded carbon bonded carbon chrome carbon-bonded carbon chrome carbon-bonded carbon chrome carbon-bonded carbon chrome carbon-bonded carbon bonded carbon carbon. the ratio of components, MZ-C g Nitri otrimethylphosphonic acid 30-50 Etklene glycol Sulfos compounds in the form of alkyl sulfates C, o-C | 6 (L il sodium salts sulfocarboxylic synthetic fatty acids C, - C 20 rest O1 .42 ND 1C Yu

Description

The invention relates to the prevention of scaling and corrosion of metals with the help of organic inhibitors and can be used in the oil industry in the extraction, transportation, preparation of oil, as well as in technological processes in other industrial enterprises, where the problem of preventing the inorganic salts from occurring occurs.

Known scale inhibitor comprising nitrilotrimethylphosphonic acid (NTF), polyacrylamide and water 1.

This inhibitor has a high corrosivity, which is explained by the high content of NTF, which is a strong acid. In addition, under the conditions of formation of the most common mixed salt deposits, including gypsum, anhydrite, calcium carbonate, chlorides of salus and sodium, the effectiveness of its inhibitory effect does not exceed 70%.

The closest to the invention to the technical essence is the inhibitor of the inorganic salt deposition 2j, containing aminoalkylphosphonic acid and ethylene glycol, while as aminoalkylphosphonic acid it contains NTF, ethylenediamine-N, H, H, N-tetramethylphosphonic acid (EDTP) or N- ( 2-hydroxyethyl) ethylenediamine-S, S, N-trimethylphosphonic acid (EDTP) in the following ratio, wt.%:

Aminoalkylphosphonic

acid50-90

Ethyl glycol 10-50

However, the known inhibitor has a high corrosivity, low inhibiting ability while preventing the formation of salt precipitates.

The purpose of the invention is to increase the degree of scaling prevention and eliminate the corrosivity of the composition.

The goal is achieved by the fact that the composition for the prevention of scaling, including NTF and ethylene glycol, additionally contains sulfo compounds in the form of alkolsulfonat C, o - C (or sodium

salts of sulfo-carboxylic synthetic fatty acids С |, - Cjo in the following ratio of components, wt.%:

NTF. 30-50 Ethylene glycol 10-30

Sulfos compound in a

CIQ-C alkyl sulfonates, or

sodium salts

sulfo carbon

synthetic

fatty acids

(MFA) From 20 Else

For the preparation of a particular composition, for example, 0.5 kg of NTP, 0.3 kg of ethylene glycol and 0.2 kg of alkyl sulfonate are taken and each of the components is introduced in any order into the container in small portions of 20-40 g with thorough mixing using mechanical agitators for, for example, one hour at a speed of 2000-2500 rpm. An inhibitor of composition 4 is obtained (Table 1). The inhibitor is used in the form of 1080% aqueous solutions.

The compositions of inhibitors salt-decomposed scientific research institute with the proposed ratio of the components are given in table. 1 (denoted by numbers 2-4 and 7-9). Compositions 1, 5, 6 and 10 are given to substantiate the optimality of the proposed compositions.

The limits of addition of sulfosilicates are determined by the need to save expensive reagent - NTF, ensuring high efficiency of the inhibitory effect and low corrosivity of the composition.

Inhibitor is tested on the example of formation water. .

The chemical composition of the water samples used is given in table. 2

five

Mixed salt precipitates containing crystals of various salts (calcium carbonate and calcium sulphate, sodium and potassium chlorides, magnesium carbonate) fall out of these waters.

O

Pr and measures. Scale inhibitors and corrosion inhibitors are introduced into water samples at various concentrations, after

what they are pumped through a thermostat at 50 ° C through a glass co-;

55 zhuh with a metal heater. The electric heater is supplied with a load of 1500 W with the help of an adjusting autotransformer 3 for 5.5 hours. At the end of the experiment, the electric heater, which accumulates mudflows, is removed from the casing, dried in an oven at 105 ° C for 30 minutes, and weighed. the effectiveness of the inhibitory effect of the proposed and known inhibitors are presented in table. 3. The data given in table. 3, it is shown that the proposed inhibitor, with a content of 0.0005 wt.% In the water forming the mixed salt sediments, has a 95-100% effectiveness inhibitory effect, and the known inhibitor has an efficiency of 67-77% while the consumption of expensive NOTs in the proposed composition is reduced by almost half. At the same time, there is a greater effect of scaling prevention (by 33-23%). The closing temperature of the proposed composition is ft5 ° C. The study of the rate of general corrosion of steel samples in aqueous solutions of inhibitors Compounds 1-10, as well as in aqueous solutions of a known inhibitor is presented in table 4. 22 From the results of the experiments, it can be seen that the proposed inhibitors (compounds 2-4 and 7-9) prevent equipment corrosion with a protective effect of 91-100%. Aqueous solutions of a known inhibitor, on the contrary, increase the intensity of corrosion processes. The technology of using an inhibitor consists in supplying an aqueous solution to the stream of watered oil at a concentration of 0.0005-0.001% by weight of the volume of secondary water. The feasibility of using the proposed inhibitor lies in the fact that the effectiveness of preventing the deposition of mixed salt deposits (a mixture of CaSO, NaCl, CaClj, CaCO, BaSO), which are most often encountered in the oil field practice, increases by 23-33%. Preventing corrosion and embrittlement of equipment, the operating costs of an expensive inhibitor (NTF) are reduced by almost 2 times.

60

60 40

Table 1

20

20

25 30 40 50 55 15 30 20 30 25 60 60 40 20 20

Continuation of table.3.

154222

 The known inhibitor contains 90% by weight of aminoalkylphosphonic acid and 10% ethylene glycol. Such a ratio, and its components determine the greatest effectiveness of a known inhibitor.

YU

Continued table. 3

ITABLE4

Claims (1)

COMPOSITION FOR PREVENTION OF SALINATION, including nitrilotrimethylphosphonic acid and ethylene glycol, characterized in that, in order to increase the degree of 30-50 10-30 nor the prevention of scaling and the elimination of the corrosive activity of the composition, it additionally contains sulfo compounds in the form of alkyl sulfonates C _{l (} j-C | b or sodium salts of sulfocarboxylic synthetic fatty acids C ^ - C ₂₀ in the following ratio of components, May.%: Nitrilotrimethylphosphonic acid Ethylene glycol Sulfonates in the form of alkyl sulfonates С ₁₀ - С _{) 6} or sodium salts of sulfocarboxylic synthetic fatty acids С |? - С g Ό Rest SU. .. 1154222