RU1813778C - Composition for prevention of asphaltene-resin-paraffin deposition in oil field equipment - Google Patents

Abstract

An increase in the effectiveness of preventing paraffin deposits during oil production due to improved dispersion of deposits in highly resinous oils is achieved by the fact that the composition contains a surface-active substance (diproxamine-157 or NGE precocel (10 - 80%), an aromatic solvent, a dispersant - dialkyl (alkaryl polyethylene) glycol ester of phosphoric acid (syntaphate-912) (0.1 -10%).

Description

Diproxamine DPA-157 (TU 6-14-614-76) - a demulsifier used for dehydration of oil in plants

oil preparation. This is the product of the addition of ethylene oxide and propylene to ethylene diamine:

n (s7stous3nbo) p

NCH2CH-N H () m (C3H60) n

2IN

where 80; m 26

As an aromatic solvent can be used butylbenzene fraction (TU - 38-10297-78), ethylbenzene fraction (TU-38-30225-81), toluene fraction (TU-38-303123-81), oil solvent Nefras Ar . 120/200, adsorbent C (TU 38-10976-84) and others.

Cu naphthate-912 is a dialkyl (alkylaryl polyethylene) glycol ester of phosphoric acid obtained by transesterification of trialkyl phosphates with monoalkyl phenyl ether polyethylene glycol OP-10 of the formula

CnH2n + iC6H40 (C2H / iO) mP (0) (OR) 2,

where m 10 - 12; n 8 to 10; R is alkyl.

Syntaphate-912 is a new chemical compound and has the following characteristics (TU 38-50796-88).

Appearance - viscous opaque brown liquid without mechanical impurities, considered when standing

T flash in open

crucible, ° C

The content of hteO,% h

Acid number,

mg KOH / g

T solidification, ° C

240 0.045-0.15

25.8. 9-12

P r and measures 1. Determination of laundering of a film of oil.

100 ml of the inventive composition was prepared; for this, 2 ml of syntaphate-912 was dissolved in 10 ml of surfactant (prevocel or diproxamine), then 88 ml of aromatic solvent was added to the resulting solution. 50 ml of Samotlor oil was poured into the flask and 0.01 ml of the obtained inhibitor was introduced into it, after that the flask was closed with a stopper and left for 20 min, after which the contents of the tube were poured back into the flask with inhibited oil. Then, formation water was poured into the tube to the mark and oil with a retarder inhibitor. The tube was sealed with a stopper and set on a laboratory bench. Turning on the stopwatch, slowly turning the tube around its axis, visually observed the formation of areas washed from the oil film.

-N

/

2IN,

(C3H60) n (C2H) niH

(С3Н6ОУС2ЬЧО) tN

0

5

0

5

0

5 0 5 0

In this experiment, for 30 s, the washout amounted to half the surface of the tube, i.e., according to the 100% procedure. At least two parallel experiments were conducted for each of the ratios of the components of the claimed composition.

Example 2. Determination of particles of dispersion and washing of paraffin deposits.

100 ml of the inventive composition were prepared in the ratio of 2 ml of syntaphate-912, 10 ml of surfactant (prevocel or, diproxamine) and 88 ml of aromatic solvent (analogously to example 1). A 1% working solution was prepared, for which 50 ml of produced water from the Samotlor field was poured into the flask, 0.5 ml of the prepared inhibitor was added and the contents of the flask were mixed until a homogeneous emulsion was formed. Then 2.5 g of paraffin deposits taken from the wells of the Samotlor field were added to the flask and the flask was heated with periodic stirring until the paraffin deposits completely melted. The flask was then cooled under running water until a dispersion of paraffin deposits in the produced water formed, mixing the contents of the flask in a circular motion. After the start of the preparation of the dispersion, the flask was placed on graph paper and at the same time the stopwatch was turned on, visually observing the size of the dispersion particles, the cooling time of the dispersion particles, and washing of the paraffin deposits.

In this experiment, visual observation showed that 50% of the dispersant particles had a size of from 0.1 to 1 mm and from 1 to 3 mm, which, according to the technique, is an excellent indicator. The lagging time of the dispersion particles was 2-2.5 minutes, which corresponds to the requirements of the procedure.

EXAMPLE 3. When analyzing the washing off of formation water paraffin deposits on the glass surface of the flask, the formation of areas washed from paraffin deposits was observed, which in appearance was either a thin bar (coating) or densely adhered deposits (sticking). Visually defined surface areas of the coating

and percent sticking is summed and subtracted from 100% of the surface of the flask in contact with the solution with stirring (equal to half the surface of the flask). Thus, in this experiment, by visual observation, sticking rates of 5% and hardening of 5% were established, and the clean surface was 90%, which, according to the procedure, is a good indicator.

Similar to the above examples, laboratory tests of the compositions in various ratios of components were carried out.

The results of laboratory tests are presented in table. 1 and 2.

From these tables it can be seen that the claimed composition is more effective than the composition of proto-L in the ratio of components, wt.%:

Surfactant (pre-target NGE 10/16

or diproxamine-157) 10-80

Syntaphate-9120.1-10

Aromatic

solvent rest

The cost-effectiveness of using the inventive composition in the Samotlor field is determined by the difference in the cost of the composition and inhibitor SNPCH-7401 (ed. St. No. 1102257). The cost of a ton of SNPCH-7401 inhibitor is 1020 rubles. The estimated cost of the claimed staff is 400 - 500 rubles.

With an average consumption of inhibitor per 1 well. 3.4 tons per year and implementation volume of 100 tons. the economic effect of the inventive composition based on syntaphat-912 reagent will be 204,000 - 210,800 rubles. in year:

E 1020 x 3.4 x 100 - 500 x 3.4 x 100 204000 rub. in year;

E - 1020 x 3.4 x 100 - 400 x 3.4 x 100 - “210800rub. in year.

Thus, the inventive composition is more effective in preventing paraffin deposition in highly resinous oils.

The expected economic benefit from the use of the invention will be "2000 rubles. on 1 well

Claims (1)

Formula and inventions Composition for the prevention of asphyllite-paraffin deposits in oilfield equipment, including a surfactant and an aromatic solvent, characterized in that, in order to increase the efficiency of the composition by improving the dispersion of deposits in highly resinous oils, it additionally contains a dispersant -synthafate-912 based on dialkyl (alkylarylpolyethylene) glycol ether of phosphoric acid, as a surfactant - precoel NGE 10/16 - product neither ethylene oxide nor propylene oxide to one molecule of alkylene or diproxamine DG A-157 is the product of addition of ethylene oxide and propylene to ethylene diamine, at the following ratios of components (wt.%): precocel NGE 10/16 product of addition ethylene oxide and propylene oxide to one molecule of alkylphenol or diproxyamine-157 - the product of addition of ethylene oxide and propylene to ethylene diamine - 10 - 80; synthate-912 based on dialkyl (alkylaryl polyethylene) glycol ether of phosphoric acid - 0.1 - 10.0; aromatic solvent else. Table 1 Table2