RU2224778C1 - Multifunctional inhibiting additive - Google Patents

Abstract

FIELD: oil and gas production. SUBSTANCE: additive that can be used to prevent formation of asphalt-tarparaffin deposits and corrosion of metal in oil-field equipment contains, wt %: neonol 1-2, sodium sulfonate 6-8, triethanolamine 2-3, sodium hydroxide 0.8-1.3, water 1.0-1.5, tallow oil 11-12, and phenol purification extract - the balance. EFFECT: improved rheological properties of paraffin-rich oil and reduced formation of deposits and metal corrosion. 6 tbl, 3 ex

Description

The invention relates to the oil industry and can be used to prevent the formation of asphalt-resin-paraffin deposits (AFS) and metal corrosion in oilfield equipment.

Known inhibitory compositions based on esters of acrylic and methacrylic acids - DN-1 and DN-MA [Skovorodnikov Yu.A. “Improving the effectiveness of depressant additives for paraffinic oils” // Oil industry. - 1978. - No. 6. - S. 49].

The closest in technical essence and in the achieved effect are multifunctional inhibitors of paraffin deposits Inkor-2, Inkor-3, Inkor 6a and Inkor-9, which include synthesized surfactants, polymer and solvent [Abbasov MV, Ismailov T.A. , Nazarov I.G., Samedov A.M., Abdullaev E.Sh., Magerramov R.S. Paraffin inhibitor of multifunctional action // Materials of the 4th International Conference “Chemistry of Oil and Gas”. - T.1. - S. 529-531].

However, they are not effective enough for oils with a mass fraction of paraffin hydrocarbons of more than 10% and for pumping oil and oil products at temperatures below 20 ° C.

The objective of the invention is the creation of an inhibitory additive with a complex effect to prevent the formation of paraffin deposits and metal corrosion on the walls of oilfield equipment.

The technical result is achieved by the fact that the inhibitory additive of complex action contains phenolic purification extract, triethanolamine, sodium hydroxide, water, neonol, sodium sulfonate and tall oil in the following ratios of components, wt.%:

Triethanolamine 2-3

Caustic Sodium 0.8-1.3

Water 1.0-1.5

Neonol 1-2

Sodium Sulfonate 6-8

Tall oil 11-2

Phenolic Purification Extract

The additive is prepared as follows: first, the phenolic purification extract is mixed with tall oil at a temperature of 30 ° C until a homogeneous mixture is obtained. The calculation of the required amount of phenolic purification extract (G _efo ) is calculated by the formula:

G _efo = G _tm · ( _K.Ch.tm -70) / 70,

where G _tm - mass of tall oil, t;

K.Ch. _tm - acid number of tall oil, mg KOH / g

After stirring, the calculated amount of triethanolamine is supplied and the mixture is stirred at a temperature of 50 ° C for 10 hours. The amount of triethanolamine (C _tea ) required for saponification of tall oil is calculated by the formula:

G _tea = (K.Ch. _{(tm + efo)} · G _{(tm + efo)} · 0.6) / _tea

where K.Ch. ( _{tm + efo)} is the acid number of tall oil after treatment with phenolic purification extract, mg KOH / g;

G _{(tm + efo)} - weight of tall oil with phenolic purification extract, g;

S.Ch. _tea - alkaline number of triethanolamine, mg HCl / g.

Then, an aqueous solution of sodium hydroxide is fed into the mixer, the amount of which (G _c ) is determined by the formula:

_With G = (KC _{(tm + EFO)} · G _{(tm + EFO)} · 0.75 · 100) / 1000 · C

where C is the concentration of an aqueous solution of caustic soda,%.

After saponification with caustic soda, the mixture is aged for about 10 hours at a temperature of + 50 ° C and then the required amount of neonol, sodium sulfonate is added and the resulting concentrate is diluted with phenolic extract.

A quantitative assessment of the process of precipitation is carried out on the installation, developed on the basis of the well-known method of “cold rod”. Under the following test conditions: the temperature of the test oil sample is 30 ° C, the temperature of the metal rod is 12 ° C and the duration of a single experiment is 60 minutes. The inhibitory ability of additives to prevent the formation of oil sludge on the “cold rod” is calculated by the formula:

S _and = (W ₀ -W ₁ ) 100 / W ₀ ,

where S _and - the degree of inhibition, wt.%;

W ₀ is the sediment yield of the original oil, g;

W ₁ - the output of oil sediment with an additive,

Kinematic viscosity is determined according to GOST 20287-74. Studies of the corrosion resistance of the additive are carried out according to GOST 9.908-85, 9.040-74 using metal plates of steel grade St-3 with a surface area of S = 0,000939 m ² . The tests are carried out at temperatures of 20 and 40 ° C for 4 hours on oil and water-oil mixture. As a water-oil mixture using a mixture of oil and Cenomanian water (CB) in a ratio of 3: 1. The composition of the Cenomanian water, g / l:

NaCl - 13.7.

CaCl ₂ · H ₂ O — 1.72.

MgCl ₂ · 6H ₂ O - 0.83.

JISC ₃ - 0.27.

Example 1. On the oil of the South Tabagan field, the inhibitory properties of the “Progress” additive were studied, wt.%:

Triethanolamine 2

Caustic Sodium 0.8

Water 1.0

Neonol 1

Sodium Sulfonate 6

Tall oil 11

Phenolic Purification Extract

The use of the Progress inhibitory additive for the oil of the Yuzhno-Tabaganskoye field prevents the process of sedimentation by 85-82% at an additive concentration of 0.03-0.05 wt.% In oil. The use of the “Progress” additive leads to a decrease in the kinematic viscosity of oil by 25.5% (Table 1.1.).

The use of the Progress complex additive for oil of the Yuzhno-Tabaganskoye field at 40 ° C reduces the corrosion rate by 1.3-1.6 times (Table 1.2.). For oil with an additive at 20 ° C, the corrosion rate in this experiment is close to zero. When additives are added to the water-oil mixture in concentrations of 0.03-0.05 wt.%, The protective effect against corrosion is 99%.

Example 2. The inhibitory effect of the additive "Progress" composition, wt.%:

Triethanolamine 2.5

Sodium Caustic 1.0

Water 1,2

Neonol 1.5

Sodium Sulfonate 7

Tall oil 11.5

Phenolic Purification Extract

was studied on oil of the Ostaninskoye field. The experimental conditions are as in example 1.

The use of the “Progress” additive for oil of the Ostaninskoye field prevents the process of sedimentation by 84-80% at an additive concentration of 0.03-0.05 wt.% In oil. The use of the additive "Progress" leads to a decrease in the kinematic viscosity of oil by 30% (table. 2.1.).

When using the Progress complex additive for oil of the Ostaninskoye field, the corrosion rate decreases by 2.8–3.7 times at 20 ° C, and 4.6–5.9 times at 40 ° C (Table 2.2.).

For the oil-water mixture using the complex additive "Progress" a decrease in the corrosion rate by 1.5 times at 20 ° C and at 40 ° C - by 1.4 times. The complex additive "Progress" shows a significant effect of protection against corrosion - from 60 to 93%.

Example 3. The inhibitory effect of the additive "Progress" composition, wt.%:

Triethanolamine 3

Sodium hydroxide 1.3

Water 1.3

Neonol 1.5

Sodium Sulfonate 8

Tall oil 11.8

Phenolic Purification Extract

was studied on oil from the Sredne-Vasyugan field. The experimental conditions are as in example 1. The results obtained are shown in tables 3.1.-3.2. The use of the Progress complex additive for oil of the Sredne-Vasyugan field reduces sedimentation by 84-81%, and the kinematic viscosity decreases by 11%.

The additive "Progress" reduces the corrosion rate at 40 ° C by 20 times, at 20 ° C there is no corrosion. For a water-oil mixture at 20 and 40 ° C, the corrosion rate under the action of the additive is reduced by 200 times. The corrosion protection effect for oil from the Sredne-Vasyugan field is 93-100%.

Thus, the proposed additive complex action “Progress” allows to improve the rheological properties of paraffin oil, to reduce the formation of paraffin and corrosion of metal on the walls of oilfield equipment and, therefore, to increase the inter-cleanup period of operation of oilfield equipment.

Claims (1)

An inhibiting additive with a complex effect based on a surfactant, characterized in that it contains neonol and sodium sulfonate as a surfactant and additionally contains phenolic purification extract, triethanolamine, sodium hydroxide, water and tall oil in the following ratio, wt.%: Triethanolamine 2-3 Caustic Sodium 0.8-1.3 Water 1.0-1.5 Neonol 1-2 Sodium Sulfonate 6-8 Tall oil 11-12 Phenolic Purification Extract