SU1281288A1 - Inhibitor of hydrate formation - Google Patents

Abstract

The invention relates to the oil and gas industry, namely, to means of preventing hydrate formation, corrosion and scaling during extraction, preparation and transportation of natural gases and allows to increase the inhibitory ability, prevent corrosion, salt deposition and reduce costs. The inhibitor is prepared by mixing the components in the following ratio, wt%: polypropsten glycol 50; calcium chloride 20-28,: catapin inhibitor -1 -1-5; water the rest. Inhibitor consumption rate of 2.8 kg / 1000 m of gas. The prepared mixture is loaded into the hydration chamber, natural gas is passed into it under a pressure of 5.5 MPa, then, lowering the temperature of the system, the temperature of the onset of hydrate formation is determined. At the same time, the decrease in the hydrate formation temperature is b c. 3 tab. a (O (/) C

Description

one

The invention relates to the oil and mining industry, specifically to the means of preventing hydrate formation, corrosion and scaling during mining, preparation and transportation of natural gases.

The aim of the invention is to increase the inhibitory capacity, prevent corrosion, salt deposition and reduce cost reduction.

Example 1. A mixture is prepared by mixing the components in the following ratio (wt.%) - Composition 1. The consumption rate of the inhibitor is 2.8 kg / 1000 m of gas.

Polypropylene glycol 3,5

X | 1 Calcium Calcium17.5

CI-1.0,5

Water 78,5

The catapin inhibitor-1, which is a part of the proposed composition, is,%:

Catapin25

Gasoline alcohol 1,5

Urotropin25

23.4

Pyridin 25

Water0,1

Catapin is a product of chemical activity.

Polypropylene glycol is a production of propylene glycol and contains in its composition, wt.%: Dipropylene glycol - 85, propylene glycol col - 12, tripropylene glycol - 2 and water 1.

The prepared mixture is loaded into a hydration chamber, natural gas is passed into it under a pressure of 5.5 MPa, then, lowering the temperature of the system, the temperature of the start of hydrate formation is determined. Meanwhile, the decrease in the hydrate formation temperature is 26 C.

Example 2. The experiment was carried out analogously to example 1 in the following ratio of components (wt.%) - composition 2: Polypropylene glycol - 5, calcium chloride - 20, KI-1, O, water - 74. At the same time, the decrease in the hydrate formation temperature is.

Example 3. The experiment was carried out analogously to example 1 in the following ratio of components (wt,%) - composition 3. The consumption rate of the inhibitor is 3.0 kg / 1000 m of gas.

Polypropylene glycol 7 Calcium chloride 25 KI-12,5

Water 65,5

The decrease in the hydrate formation temperature is 36.0 ° C.

EXAMPLE 4 The experiment was carried out analogously to example 1 with the following ratio of components (wt.%) —Composition 4. The inhibitor consumption rate was 3.5 kg / 1000 m of gas. Polypropylene glycol 10 Calcium chloride 28 KI-15

Water57

The decrease in the hydrate formation temperature is 41.5 C.

EXAMPLE 5 The experiment is carried out analogously to example 1 in the following ratio of components (wt.%) - composition 5. The consumption rate of the inhibitor is 4.5 kg / 1000 m of gas. Polypropylene glycol 12 Calcium chloride 30 KI-17,0

Water46,5

The decrease in the hydrate formation temperature is 32 C.

In Example 5, the composition indicators are good, but the inhibitor consumption increases dramatically.

Example 6. The effectiveness of the proposed composition as a corrosion inhibitor is determined by the weight loss of the metal on steel samples 3. A two-phase medium containing kerosene and 3% aqueous is chosen as the most aggressive medium model.

NaCl solution, acidified with 0.04% acetic acid solution. The phase ratio is 1: 1, the corrosive environment is saturated with hydrogen sulfide to a concentration of 2000 mg / l.

Inhibitor tests are carried out with constant agitation of the corrosive environment for 3 hours. In Table. 1 presents data on the inhibiting properties of the composition.

Example 7. The effectiveness of the inventive composition as an inhibitor, preventing the deposition of salts, is determined on samples-witnesses in the form of a stainless steel tube. The working solution is poured into a vessel equipped with an electric motor with a stirrer, the solution flows by gravity into the system, the temperature is monitored with a thermometer installed on the code

31281288

from the heating system, and maintained within the required limits. At the end of the test tube, i.

Naime

The witness is dried at 105–110 ° C, and the lesion is weighed. The results of the experiments are presented in Table. 2

Comparative indicators of the proposed hydrate formation inhibitor and its separate components are given in Table. 3.JO

Claims (1)

Invention Formula Continuation of table 1 about Concentration, mg / l Corrosiopa Wednesday: 3; OZ NaCt + 0.05 SNdON - kerosene (1; 1) saturated with H S up to 2000 mg / l noschetny effect. A natural gas hydrate formation inhibitor based on aqueous solution of polypropylene glycol, characterized in that, in order to increase inhibitory capacity, prevent corrosion, salt deposition and reduce cost, it additionally contains calcium chloride and catapin inhibitor in the following ratio of components, wt. %: Polyprogram glycol 5-10 Calcium Chloride 20-28 Catapin inhibitor-1 1-5 WaterEverything Table 1 without ingiitod lactous alcium I-1 100 250 500 50 100 250 500 5.6 5.0 5.0 5.0 0.40 0.40 0.38 0.37 Naming 50 92.85 Without ingi-2.85 bitor 93.20 94.30 KI-1 composi- and 1 composites 2 Composites 3 50 100 250 500 50 100 250 500 50 100 250 500 0.38 0.21 0.14 0.02 0.30 0.20 0.13 0.02 0.27 0.18 0.12 0.02 93.20 96.25 97.67 99.64 96.42 97.67 97.60 99.64 96.78 97.85 99.64  table 2 The name Consumption g / l Medium: brine water saturated with salt, Ca, HS, Na, CO, sd.; J and others. 250 g / l salt deposition g / l protective effect,% 80 - 5 70 12.5 10 50 37.5 51281288 Continuation of table 2 Continuation of table 2