RU2566795C1 - Composition for preventing asphaltene-resin-paraffin deposits - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: composition contains, wt %: non-ionic surfactant - 1.0-20.0, monoethanolamine - 0.5-7.0, sulphonic acid derivative - 1.0-20.0, methanol - 0.5-95.0, aromatic solvent - the balance.

EFFECT: composition has high solubility, dispersion and detergent activity with respect to different asphaltene-resin-paraffin deposits and demulsifying effect.

4 tbl, 19 ex

Description

The invention relates to the oil industry, in particular to compositions for preventing the deposition of asphaltenes, resins, and paraffins and can be used in the processes of extraction, transport and storage of oil.

Known reagent to prevent asphaltene-resin-paraffin deposits, including in wt. %: 15-30 Ν-alkyl- N, N-di (polyethylene glycol) amines based on coconut oil acids, 1-5 monoalkyl ether of polyethylene glycol based on synthetic higher fatty alcohols and the rest is a solvent (see RF Patent No. 2034894, MKI S09K 3/00, ЕВВ 37/06, publ. 1995).

The reagent is not effective enough to inhibit paraffin deposits in oils containing water.

A known composition for preventing asphaltene-resin-paraffin deposits, containing in wt. %: 20-65 block copolymer of ethylene and propylene oxides, 1-15 oil-soluble surfactant, 3-10 monoalkyl ether of polyethylene glycol based on a compound with a mobile hydrogen atom and the rest is a solvent (see RF Patent No. 2104391, MKI E21B 37 / 06, publ. 1998).

The known composition exhibits low effectiveness in preventing paraffin, since it does not have a sufficient degree of dispersion of particles of paraffin.

Closest to the proposed invention in technical essence and the achieved result is a composition for preventing asphaltene-resin-paraffin and paraffin-hydrate deposits, containing in wt. %: 5-35 oxyalkylated amino compound, 5-10 monoalkyl ether of polyethylene glycol based on primary fatty acids, 5-15 triethanolamine, 10-30 methanol and the rest is a solvent (see RF Patent No. 2115682, MKI C09K 3/00, Е21В 37 / 06, publ. 1998).

However, this composition exhibits low efficiency for the prevention of paraffin due to an incomplete degree of dispersion of paraffin particles, the washing of the oil film and the delamination of the aqueous phase of the oil from the organic phase containing paraffin.

The aim of the invention is the development of a composition for the prevention of asphaltene-resin-paraffin deposits, with high dissolving, dispersing and washing activity in relation to various types of paraffin deposits.

This goal is achieved by creating a composition for preventing asphaltene-resin-paraffin deposits containing a nonionic surfactant, an amine-containing reagent, methanol and an aromatic solvent, moreover, it contains a sulfonic acid derivative, and monoethanolamine as an amine-containing reagent, in the following ratio of components wt. %:

nonionic surfactant substance 1,0-20,0 monoethanolamine 0.5-7.0 sulfonic acid derivative 1,0-20,0 methanol 0.5-95.0 aromatic solvent rest

For the preparation of the claimed composition as a nonionic surfactant can be used, for example, neonol AF 9-10 or neonol AF 9-12 according to TU 2483-077-05766801-98, syntanol ALM-2, or ALM-3, or ALM -10, or DS-10 according to TU 6-14-864-88, OP-7, OP-10 according to GOST 8433-81, syntamide - 5 according to TU 2483-064-05807977-2003.

Monoetonolamine is used according to TU 2423-159-00203335-2004.

As a sulfonic acid derivative, for example, sulfen-35K according to TU 2481-001-72649752-2004 with ISM 1, alkylbenzenesulfonic acid (ABSK) according to TU 2481-036-04689375-95, paratoluenesulfonic acid (PTSK) made in China can be used.

Methanol is used according to GOST 2222-78.

The following can be used as aromatic solvent: petroleum toluene according to GOST 14710-78, Nefras Ar 120/200 according to TU 38-101809-80, Nefras 120/120 according to TU 38-30225-81, butylbenzene fraction (BBF) according to TU 2414- 076-05766563-2005, ethylbenzene fraction (EBP) according to TU 2415-195-00203335-2010, liquid pyrolysis products (GIP) according to TU 2451-001-68699968-2011.

The proposed composition can be prepared both in industrial production conditions, and immediately before use by mixing the components of the composition in the claimed quantities using tankers with circulation.

The composition is a liquid from yellow to dark brown in color with a pour point of no higher than -40 ° C.

We give examples of the preparation of the proposed composition to prevent paraffin, the compositions are shown in table 1.

Example 1 (the claimed composition)

1.0 g of Syntamide-5, 5.0 g of monoethanolamine, 10.0 g of Sulfene 35K are added successively to the prepared solution containing 34.0 g Nefras Ap 120/200 and 50.0 g methanol with constant stirring and stirring is continued until formation homogeneous solution (see table 1, example 1).

Examples 2-18. Other compositions are similarly prepared by changing the amount and type of the claimed reagents.

Example 19 (prototype).

To a chemical vessel, 5.0 g of diproxamine-157 are sequentially poured into 5.0 g of syntanol ALM-10, 5.0 g of triethanolamine, 10.0 g of methanol and 75.0 g of butyl alcohol. The vessel is closed with a ground stopper and the resulting composition is mixed with agitation (see table 1, example 19).

To prove the effectiveness of the inventive composition, experiments are carried out in laboratory conditions to determine the degree of dispersion, adherence and glossing of paraffin deposits under the influence of the inventive composition on the paraffin samples of various oil producing institutions of the Perm Territory, washing off the oil film and the demulsifying ability of the claimed composition.

The test procedure is as follows. In a 250 ml conical flask, 50 ml of produced water is poured and a paraffin inhibitor at a concentration of 150 g / t is dosed into it. Next, a paraffin ASPO weighing 2.5 g is placed in the flask and heated on a tile until the paraffin is completely dissolved. Then the mixture is cooled in a bath of cold water, shaking the flask in a circular motion. In this case, the dispersion of the paraffin deposits, the sticking and coating of the walls of the flask with it are fixed.

The degree of dispersion is estimated by the size of the AFS particles: 0.1-3.0 mm - excellent result, 0.1-5.0 mm - good, 0.1-7.0 mm - satisfactory, above 7.0 mm - unsatisfactory.

Adhesion is evaluated as a percentage of the surface of the flask: up to 5% - excellent result, up to 10% - good, up to 40% - satisfactory, above 40% - unsatisfactory.

Coating is also evaluated as a percentage of the surface of the flask: the result is excellent if the coating is up to 5%, good - up to 20%, satisfactory - up to 50%, unsatisfactory - more than 50%.

To determine the degree of washing off the oil film, the produced water is poured into a glass test tube with defatted walls to half the volume and oil is added to the top with a paraffin inhibitor contained in it at a concentration of 150 g / t. The tube is closed with a core, squeezing the air, and the tube is turned down the tube. After 30 seconds, the film of oil was washed off the walls of the tube. The result is considered to be excellent if more than 70% of the tube surface is washed in 30 seconds, good in 60 s and satisfactory in 180 s.

The determination of the demulsifying ability of the reagent is as follows. Oil containing water (flooded oil, emulsion) in the amount of 100 ml is poured into a 100 ml glass graduated test tube with a screwed stopper, a paraffin inhibitor is dosed with a microdoser at a rate of 150 g / t, closed with a stopper and the tube is thoroughly mixed by shaking. Next, the test tube is placed in a thermostat and begin to record the level of released water at certain intervals. The experiment was carried out at a temperature of 50 ° C, the time of the marks of the levels of released water was 10, 30 and 60 minutes. According to the water level marks for the indicated time intervals, the dynamics (speed) of demulsification is evaluated, and the degree of demulsification from full (a test tube with a reagent aged to a constant level of released water) is calculated in percentage terms.

In the tests, samples of oils, paraffin deposits and formation waters of the Perm Territory are used.

Oil 1 Pavlovskoye field, well 964

Oil 2 Pavlovskoye field, well. 816

Oil 3 Pavlovskoye field, well. 752

Oil 4 Pavlovskoye field, well. 853

Oil 5 Shagirtskoye field, well. 1122

Oil 6 Gozhanskoye field, well. 670

Oil 7 Moskudinsky field, well. 220

Oil 8 Moskudinsky field, well. 4020

Table 2 shows the group composition of the studied paraffin deposits.

Table 3 shows the components of the formation water.

Formation water 1 BKNS 0505S (UPSV "Dawn")

Formation water 2 BKNS-0103

Produced water 3 KNS-0304

Table 4 shows the results of testing the proposed composition to prevent asphaltene-resin-paraffin deposits. Analysis of the data table shows an increase in the effectiveness of the prevention of paraffin and demulsifying effect compared with the prototype.

Claims (1)

A composition for preventing asphaltene-resin-paraffin deposits, containing a nonionic surfactant, an amine-containing reagent, methanol and an aromatic solvent, characterized in that it additionally contains a sulfonic acid derivative, and monoethanolamine as an amine-containing reagent in the following ratio, wt. %:
nonionic surfactant 1,0-20,0 monoethanolamine 0.5-7.0 sulfonic acid derivative 1,0-20,0 methanol 0.5-95.0 aromatic solvent rest.