RU2753827C1 - Composition for oil production and transportation - Google Patents

Abstract

FIELD: oil industry and transportation.

SUBSTANCE: invention relates to oil production and pipeline transport of oil and petroleum products and can be used to prevent the formation of asphalt-resin-paraffin deposits in the bottom-hole zone of oil wells and in oil pipelines, to reduce the viscosity during the transportation of high-viscosity types of oil and to destroy oil-water emulsions. The composition for preventing the formation of asphaltene-resin-paraffin deposits contains, by weight percentage: sodium alkylbenzenesulfonate 15-25; nonionic surfactant with 6-13 hydroxyethylated groups 3-8; oxy-leaded phosphoric acid alkyl ether or its potassium or ethanolamine salt 1-4; hydrocarbon solvent 6-12; aliphatic alcohol C1-C3 8-12; sodium hydroxide NaOH or potassium hydroxide KOH 5-15; sodium alkane sulfate being the rest.

EFFECT: increase in the efficiency of preventing the formation of asphalt-resin-paraffin deposits while simultaneously reducing the viscosity of high-viscosity oils and demulsification of oil-water emulsions.

1 cl, 2 tbl, 3 ex

Description

The invention relates to oil production and pipeline transport of oil and oil products and can be used to prevent the formation of asphaltene-resin-paraffin deposits (ARPD) in the bottomhole zone of oil wells and in oil pipelines, to reduce viscosity during transportation of high-viscosity types of oil and to destroy water-oil emulsions.

Known composition for the protection of oilfield equipment from corrosion and asphaltene-resin-paraffin deposits, as well as the destruction of water-oil emulsions, including a block copolymer of ethylene and propylene oxides based on glycerin with a molecular weight of 3000-6000, the product of the interaction of oxyethylated and oxypropylated glycerin with toluene diisocyanate (patent No. 61 C1.10.11.99, C10G 33/04).

The known composition is a reagent of complex action and is quite effective, however, it is selective.

The closest in technical essence and the achieved result is a composition for oil production and transportation (RU patent N 1110152, 5 С09К 3/00, Е21В 37/00, publ. 08/30/94, bull. N 16), containing sodium alkanesulfonate, sodium alkylbenzenesulfonate , nonionic surfactant with 6-13 oxyethyl groups, oxyethylated alkyl ether of phosphoric acid or its potassium or ethanolamine salt, hydrocarbon solvent, in the following ratio of components, wt. %:

The composition effectively prevents the formation of asphaltene-resin-paraffin deposits, slows down gas separation without impairing the permeability of the bottomhole zones of productive formations. However, the composition has a high viscosity, therefore, when transporting active high-viscosity oils, high hydraulic resistances are observed. In addition, it is not a reagent of complex action, does not solve the problem of destruction of an oil-water emulsion.

The basis of the present invention is the task of increasing the effectiveness of preventing the formation of asphaltene-resin-paraffin deposits (ARPD) by increasing the stability of the composition while reducing the viscosity of high-viscosity oils and the destruction of oil-water emulsions.

The task is achieved by the fact that the composition for preventing deposits of ARPD containing sodium alkanesulfonate, sodium alkylbenzenesulfonate, nonionic surfactant with 6-13 oxyethyl groups, oxyethylated alkyl ether of phosphoric acid or its potassium or ethanolamine salt and hydrocarbon solvent, additionally contains aliph -C3 and alkali metal hydroxide NaOH or KOH at the following ratio of components, wt%:

Sodium alkylbenzenesulfonate 15-25 Nonionic surfactant 6-13 oxyethylated groups 3-8 Oxyethylated Phosphoric Acid Alkylether or its potassium or ethanolamine salt 1-4 Hydrocarbon solvent 6-12 Aliphatic alcohol C1-C3 8-12 Alkali metal hydroxide NaOH or KOH 5-15 Sodium alkanesulfonate Rest

The essential features of the method are:

1. Sodium alkylbenzenesulfonate

2. Nonionic surfactant with 6-13 oxyethyl groups

3. Oxyethylated alkyl ester of phosphoric acid or its potassium or ethanolamine salt

4. Hydrocarbon solvent

5. Aliphatic alcohol C ₁ -C ₃

6. Alkali metal hydroxide NaOH or KOH

7. Sodium alkanesulfonate

8. Quantitative ratio of components

Features 1, 2, 3, 4 and 7 are common with the prototype, features 5, 6 and 8 are essential distinguishing features.

The essence of the invention.

As a nonionic surfactant, the composition contains monoalkyl ethers of polyethylene glycol based on fatty alcohols of the fraction C ₁₀ -C ₁₃ (Sintanol DT-7, TU 6-14-1037-79) or mono- and dialkyl ethers of polyethylene glycol (Wetting agent DB, MRTU 6 -02-530-80).

Of the sodium alkylbenzenesulfonates, sulfonol with 10-18 carbon atoms is used (TU-01-1043-79 or TU 6-01-1001-73 or TU 38-9-35-69).

From sodium alkanesulfonates - Volgonate containing 11-17 carbon atoms (OST 6-01-32-77).

We also used oxyethylated alkyl ether of phosphoric acid or its potassium or ethanolamine salt in the form of Oxyphos KD-6 (TU 6-02-640-73), estefate (TU 6-02-1148-78) or oxyphos B (TU 6-02-812 -73).

The composition contains gasoline (GOST 2084-77) or White spirit (GOST 2134-78) as a hydrocarbon solvent.

As aliphatic alcohols of the C ₁ -C ₃ group, technical ethyl alcohol (GOST 17299-78) or methyl alcohol (GOST 69-95-77) is used.

The alkali metal hydroxide is NaOH (GOST 2263-79) or KOH (GOST 24363-80).

The initial components, taken in a certain mass ratio, are mixed until a homogeneous low-viscosity mass is formed.

Example 1. Prepare a mixture of 54 g of sodium alkanesulfonate (Volgonate), 12 g of ethyl alcohol, 5 g of sodium hydroxide and 7 g of White spirit. Upon reaching the homogeneity of the mixture by volume with constant mechanical stirring, 2 g of syntanol DT-7, 17 g of sodium alkylbenzenesulfonate, 3 g of oxyphos KD-6 are introduced. Received 100 g of the composition is dissolved in water and used according to the proposed technology.

Example 2. Prepare a mixture of 51 g of sodium alkanesulfonate (Volgonate), 8 g of ethyl alcohol, 7 g of sodium hydroxide, 9 g of White spirit and mix. Upon reaching the homogeneity of the mixture by volume with constant mechanical stirring, 2 g of Syntaiol DT-7, 20 g of sodium alkylbenzenesulfonate and 3 g of oxyphos KD-6 are introduced. Received 100 g of the composition is dissolved in water and used according to the proposed technology.

Example 3. Prepare a mixture of 48 g of sodium alkanesulfonate (Volgonate), 10 g of ethyl alcohol, 10 g of sodium hydroxide, 8 g of White spirit and mix. Upon reaching the homogeneity of the mixture by volume with constant mechanical stirring, 2 g of Syntanol DT-7, 19 g of sodium alkylbenzenesulfonate and 3 g of oxyphos KD-6 are introduced. Received 100 g of the composition is dissolved in water and used according to the proposed technology.

Composition options are given in Table 1, and their performance characteristics, determined during the tests, are shown in Table 1. 2. When introduced into oil, the composition is dissolved in fresh, sea or formation water to a concentration of 0.05-100.0%. The effectiveness of the composition was determined in laboratory conditions according to the following indicators: decrease in the viscosity of high-viscosity oils; the effectiveness of preventing the formation of asphalt-resin-paraffin deposits; separation efficiency of oil-water emulsion.

The viscosity of high-viscosity oils was determined on a Brookfield LVDV-II rotary viscometer.

The effectiveness of preventing the formation of asphalt-resin-paraffin deposits was determined by the amount of ARPD deposited from oil on the surface of a metal cylinder with a temperature below the wax crystallization temperature. Efficiency (E) was determined by the formula:

where Р ₀ - the mass of the sediment from the control sample (without additives of the composition); P is the mass of the sediment from the oil sample with the addition of the composition.

The separation efficiency of the oil-water emulsion was determined visually by the amount of released water for a given time. The water cut of the original oil was determined by the Dean-Stark method in accordance with GOST 2477-65. The degree of dehydration of the oil emulsion was determined on the basis of the data on the volume of released water over time and the initial water content, according to the formula:

where: γ - degree of dehydration,%;

V is the volume of released water, ml;

V ₀ - initial water cut, ml.

As an oil emulsion, oil was used, which has an asphalt-resinous type of stabilizers and which is quite difficult to degrade at a temperature of 20 ° C with the help of imported and domestic demulsifiers traditionally used by the oil industry.

The composition practically does not penetrate into oil, but has a complex effect at the interfaces: oil-water, oil-wetted pipe perimeter, water-rock, water-metal, water-air, water-microcrystals of paraffins and salts. The effectiveness of preventing the formation of ARPD when using the composition practically does not depend on the degree of mineralization of the aqueous phase. Examples given in table. 2, were obtained using saline associated water (total salinity 209 g / l). Less concentrated aqueous solutions and analogues of this composition do not have an excess of free surface energy, are homogeneous, and therefore are practically infinitely stable under any conditions of storage and operation. The stability parameter of the composition is meaningful only in relation to the commercial form (100%) of the composition. These data on the stability of the composition are given in table. 2.

As can be seen from the table. 2 data, additional introduction into the composition of aliphatic alcohol C ₁ -C ₃ , sodium hydroxide at the specified ratio provides an increase in the efficiency of surface protection from ARPD, especially for high-viscosity active oils, a more significant decrease in viscosity compared to the prototype, and significant destruction of the oil-water emulsion occurs.

Claims (2)

Composition for preventing the formation of asphaltene-resin-paraffin deposits, containing sodium alkanesulfonate, sodium alkylbenzenesulfonate, nonionic surfactant with 6-13 oxyethylated groups, oxyethylated alkyl ether of phosphoric acid or its potassium or ethanolamine salt and a hydrocarbon solvent, which additionally contains -C3 and sodium or potassium hydroxide in the following ratio of components, wt%: Sodium alkylbenzenesulfonate 15-25 Nonionic surfactant 6-13 oxyethylated groups 3-8 Oxyethylated Phosphoric Acid Alkylether or its potassium or ethanolamine salt 1-4 Hydrocarbon solvent 6-12 Aliphatic alcohol C1-C3 8-12 Alkali metal hydroxide NaOH or KOH 5-15 Sodium alkanesulfonate Rest