SU1682374A1 - Formulation for removing inorganic and asphalteno-resino-paraphinic deposits - Google Patents

Abstract

This invention relates to the petroleum industry. The goal is to increase the removal efficiency of deposits including iron sulphide. The composition contains the following ingredients in their ratio, wt.%: A scale inhibitor on organophosphate base Inkredol 2.0-8.0, non-ionic surfactant (surfactant) 0.3-0.4, hydrochloric acid 17.5 -19.0, water - the rest. Hydroxyethylated alkyphenols based on a-alefins and propylene trimers are used as nonionic surfactants. When preparing the composition, a hydrochloric acid solution is preliminarily prepared, in which the scale inhibitor is dissolved on an organophosphorus base and a non-ionic surfactant to the desired concentration. This composition keeps the destroyed sediment in suspension, which prevents the blockage of wells and pipelines with sediments. 7 tab. (Ls

Description

The invention relates to the petroleum industry, namely, to remove deposits of complex composition containing iron sulfide, asphalto-resin-paraffin substances, calcium carbonate in the system of extraction, transportation and storage of oil.

The aim of the invention is to increase the removal efficiency of inorganic compounds, including iron sulfide, and asphaltene-resin-paraffin deposits.

The goal is achieved due to the fact that the composition for removing sediments based on an aqueous solution of hydrochloric acid, including an organophosphorus compound and a non-ionic surfactant, contains, as an organophosphorus compound, the scale inhibitor Incredol-1, consisting of wt. - phosphonic

acid28-32

Methylimine-methylphosphonic

acid3-15

Phosphorist

acid1-5

Urea15-18

Ethylene glycol 7-9

Ammonia10-13

WaterUnder 100

and as a non-ionic surfactant it contains hydroxyethin 00

YOU

2

alkylphenols based on α-allefins and propylene trimers in the following ratio, wt.%:

Inhibitor

scaling on

organophosphate

based 2.0-8.0

Non-ionic

surface active

substance0.3-0.4

Sol na acid17,5-19,0

WaterEverything

The phosphorus-based (scaler-1) scale inhibitor is a composition consisting of nitrilotrimethylphosphonic acid, ammonia, urea, ethylene glycol, a corrosion inhibitor and water.

Inkredol-1 is a phosphate type inhibitor, has complexing and crystal-depleting properties:

Aggregate

fluid condition

Color Green

Smell Slightly

specific

pH of solution is 1.5-2.0

Temperature, ° С:

boiling, above 100

decomposition above 150

Frozen Below -40

Density at

20 ° С, g / cm31,3-1,4

Viscosity at minus

20 ° С, MPa.sn 50

Water solubility:

fresh good

reservoir

Solubility

in oil Insoluble

Compatibility Compatible with

reservoir and incidentally mined

water containing calcium ions up to 35 g / dm3

Inkredol-1 is a low-toxic compound, has the properties of a strong acid, is non-combustible, non-explosive and does not adversely affect the preparation and processing of oil,

The non-ionic surfactant neonol AF-14 is hydroxyethylated alkylphenols based on propylene and a-olefin trimers. Neonol AF-14 is used as an emulsifier.

Aggregate

fluid condition

Color Colorless

solution pH

10 g / dm3 6-8

Temperature, ° С:

boiling point 280

congealing 13-17

self-ignition 412

Density at

50 ° С, kg / m31040

Viscosity at

20 ° С, mPa-s417

Solubility:

in the waterGood

in oil - Massowa dol

active substance,% 99

Hazard Class 3

The following solutions are necessary for the preparation of the composition:

15% hydrochloric acid solution (in a volumetric flask with a capacity of 100 cm3, place 50 cm3 of concentrated hydrochloric acid and bring the volume to the mark with distilled water);

5% solution of Incredol-1 (in a volumetric flask with a capacity of 100 cm, add 5 cm of the concentrated solution of Incredol-1 and bring the volume to the mark with distilled water);

1% solution of neonol AF-14 (in a volumetric flask with a capacity of 100 cm °, place 1 cm of the neonol solution and bring the volume with distilled water to the mark).

Drain these three solutions into a flask and mix thoroughly.

The effectiveness of the recommended composition for removing deposits of complex composition was determined experimentally on samples taken from oil producing wells.

The chemical composition of the sediments is given in table. 1, in table. 2 and 3 are compositions of the compositions tested under laboratory conditions as scale removers of complex composition, including iron sulfide, asphaltene-resin-waxy substances and calcium carbonate.

The effectiveness of the recommended compositions for removing deposits of complex composition is determined experimentally by the following method: weights of various salt deposits (1 g) are placed in test tubes and 10 ml of the test mixture is poured. After 4 hours, the remaining precipitate is filtered, washed and weighed. The removal efficiency of the deposits is calculated by the formula

five

P1-P2

Pi

100%

1682374

prevents blockage of wells and pipelines with damaged sediments.

labor

where Pi is the weight of the deposit before removal,

RA is the weight of sediment after removal.

The results of the sediment removal experiments I are given in table. 4, where effective compositions are those that remove sediment by 50% or more,

The data presented in tab 4 show that compositions 11, 14, 15, and 18 are effective, which contain hydrochloric acid, a scale inhibitor on an organophosphorus base, incredol-1, a non-ionic surfactant neonol AF-14, a priority of NG- 12 in various ratios. The most effective composition I is tested on four types of deposits (Table 1). The test results are shown in Table. five.

In tab. 6 shows the data on the qualitative and quantitative content of the investigated samples of composition 11.

In tab. 7 shows the results of the removal of salt deposits in samples of Composition 11.

Thus, from table. 4-7 it follows that. The proposed composition is highly effective.

This composition keeps the destroyed sediment in suspension, which

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five

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five

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Claims (1)

Invention Formula A composition for removing inorganic and asphaltene-resin-paraffin deposits, including an aqueous solution of hydrochloric acid, an organophosphorus compound and a non-ionic surfactant, characterized in that, in order to increase the efficiency of the removal of deposits including iron sulfide, it contains dol-i, and as a non-ionic surfactant contains hydroxyethyl alkylphenols based on a-alefins and propylene trimers and in the following ratio, wt.%: Inhibitor scaling incredol-12-8 Hydroxyethyl Alkylphenols on the basis of a-alefins and trimers propylene 0.3-0.4 Sol on acid17.5-19.0 WaterEverything Table 1 2 eleven 12 2 one. 3 one 3 four 3 one 3 four 3 one 3 four 3 one one one 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 54 27.1 18.9 30.7 19.0 18.1 17.8 30.8 19.0 18.1 17.8 30.8 19.2 14.2 18.1 17.5 13.6 6.5 6.0 2.1 5.1 2.1 6.0 7.9 5.1 8.0 6.0 7.9 5.1 2.1 4.7 8.0 2.0 2.9 2, 0 1.5 100 54.2 37.2 2.8 Table 3 one 5, 8 0.4 0.6 0.3 0.3 0.4 0.3 0.6 0.3 0.3 100 31.1 46.0 29,} Rest n n tl- || 11 „It 3.4 2.5 Table 4 Table 5 Table Table 7