SU1495354A1 - Composition for controlling paraffin and resin deposition in oilfield equipment - Google Patents

Abstract

The invention relates to the petroleum industry and can be used to remove and prevent the formation of asphalt-resin and paraffin deposits in the systems for extracting, transporting and storing oil, for example, in well bottom zones, in underground and surface field equipment. The goal is to increase the efficiency of dispersion and dissolution of deposits. The composition includes (wt.%) Hexane fraction 70-90 and bottoms production of butyl alcohols by the method of oxosynthesis 10-30. Hexane fraction - secondary product, mixture of alkanes of composition C ₆ -C ₁₀ . The bottoms of the production of butyl alcohols are secondary production, they contain alcohols, aldehydes, esters of C ₄ and higher, and a boiling point of 130-300 ° C. Using the composition, 89-97% of deposits of various types are removed and it is more efficiently known. 3 tab.

Description

The invention relates to the petroleum industry and can be used to remove and prevent the formation of asphalt-resin and paraffin deposits in the systems for extracting, transporting and storing oil, for example, in well bottom-hole zones, in underground and above-ground field equipment.

The aim of the invention is to increase the efficiency of dispersion and dissolution of asphalt-resin-paraffin deposits (ARP).

The composition, including the hexane fraction, additionally contains bottoms production of butyl alcohols by the method of oxosynthesis in the following ratio of components, wt.%:

Hexane fraction 70-90 Vat residues of the production of butyl alcohol 10-30

The bottoms are secondary raw materials for the production of butyl alcohols by the method of oxosynthesis in chemical plants.

The composition of the bottoms of the alcohols, wt.%;

four;; coke

00

SP

i

1495354

3-14

3-15

2-12

3-135

5-24

5-28

5-30U

. 5-41

Acetal of isobutyric aldehyde and

and-butanol

Ester isomasnoe

acid and 2-ethiphexanol

Ether n-oil

acid and 2-ethylhexanol

No ideas impurity impurities

Isobutanol

Physical and chemical characteristics: Boiling point at normal pressure, with Acid number, mg KOH / g Essential number, mg KOH / g Carbonyl number, mg KOH / g Hydroxyl number, mg KOH / g

(In parentheses are the limits of change of parameters).

The hexane fraction, a secondary production product, is a mixture of hydrocarbons of composition C and vii, used as a raw material in refineries, in the production of motor gasoline. This is a colorless liquid with a specific aroma of hydrocarbons.

Physico-chemical constants of the hexane fraction:

Density, kg / m

Viscosity

Interfacial tension

n / m

731 0.78

Temperature, (

boil

Flash Solubility:

in water

0.047

97-140 -3

Insoluble

in oil Soluble indefinitely;

The chemical composition of the hexane fraction,% ::

15.0 50.2 6.5 9.2 8.3 5.0 5.8

130 - 300 2.5 (2-5) 105 (90-115) 64 (55-70) 237 (220-240)

The pre-compound composition is 5 a physical mixture of two ingredients - the bottoms of butyl alcohols and the hexane fraction, the mixture of which is not accompanied by a chemical reaction, i.e. their chemical composition does not change.

Physico-chemical properties of the proposed composition:

five

0

five

Density, kg / m Viscosity, mm / s, with;

20 ° С

Temperature, C;

flashes

Solubility:

in the back

in oil

800

2.4-2.7 1.6-2.0 1.2-1.6

22-24 (4o) - (- 50)

Insoluble ma

Dissolves indefinitely

For the study, field paraffin deposits of deposit A, having the following composition, were used. wt.%, and properties:

Paraffin48,2

Silica gel resin 2.99

Asphaltenes1,29

Sediment density, kg / m

1290

Fusing temperature, s

77.4

as well as smoparaffin deposits of deposit B, having the following composition, wt.%, and cBofioTBa:

23.25 3.30 6.95

75.4

Paraffin

Silica gel resins

Asphaltenes

Melting point, C

The effectiveness of the compositions is determined by the change in the mass of the sediments that are selected from the paraffin-producing wells after they have been aged for 90 minutes in 100 ml of the composition under study at room temperature.

The essence of the method consists in determining the dispersion, dissolution of commercial resin-paraffin deposits in the studied composition under dynamic conditions. The ratio of the amount of sediment to the remover reagent (in this case, the composition under study) can vary from 1: 5 to 1:: 100 depending on the size of the container and the reagent vessel. The duration of the experiment is established experimentally. Upon its completion, the effectiveness of composition E is determined by dispersion and dissolution by the formula:

m - m 2 m

X 100

(

m -

where m, is the mass of the sediment sample under study prior to contact with the studied composition, g; the mass of insoluble residue deposits in a container with a side of holes O, 15 mm after contact with the test composition, g, Dp experimental verification of the composition of resin-paraffin deposits of the field A is prepared six mixtures of ingredients (hexane fraction + + bottoms of butyl alcohols) in various ratios x Mixtures are obtained by simply mixing the components; The effectiveness of the proposed and well-known compositions at field A and B is shown in Table. .1 and 2 respectively.

Example 1. 90 ml of the hexane fraction and 10 mp of the bottoms of butip alcohols are poured into the beaker, the beaker is placed on a magnetic stirrer, and the flexible thread is suspended in the beaker

pre-weighted metal container with a hole side of 0.15 mm with two grams of commercial resin-paraffin deposits. The mixer is turned on without heating for 30 minutes. Then the container is expanded, dried, weighed, and the effectiveness of dispersion and sediment dissolution is determined by the formula. Then the container was placed 2 more times for 30 minutes per test composition and each time the efficiency was determined. With an increase in the duration of contact with the composition under study up to 120 minutes, the solubility of sediments increases slightly - by an average of 1 to 10%; therefore, the optimal time required to remove deposits does not exceed 90 minutes. The results of the effectiveness of the composition in laboratory tests are given in Table. 3

thirty

35

40

As a result of the experiment, in 90 min the deposition of deposit A is completely destroyed. The degree of dispersion to a particle size of 0.15 mm or less is 96.68%. When this occurs and the partial dissolution of sediment.

Similarly carried out determine the effectiveness of the composition with a different ratio of ingredients (Table 1).

The composition is used in the following way.

The estimated amount of the composition is poured into the annular space of the well or tubing-tubing (tubing), and the well is set to circulate the tubing — the annulus i.

Upon completion of the circulation, the well is put into operation in accordance with the approved process conditions.

The amount of solvent required 50 yes rinse depth equipment is determined based on the amount of resin-paraffin deposits on the tubing walls and the effectiveness of the composition. For example, for the deposits of Western Siberia, 55 is required the amount of the composition. equal to 0.2-5.0 m.

The following are used as technical means for pumping solvents: an AC-320 unit, an AC-5 tank truck and

other types of mobile pumping units.

Being surface-active substances, the components of chicken residues of butyl alcohols are characterized by a high penetrating effect in ARPD, weaken structural and mechanical bonds in paraffin deposits and, as a result, in combination with the hydrocarbon solvent, which is hexane fraction, contribute to more intense their dissolution. In addition, the bottoms are a good dispersant, form a stable dispersion of paraffin in the oil and prevent its secondary precipitation from solution when the thermodynamic conditions change.

Thus, the composition according to the efficiency of dispersion and solution

40.0

70.0

41.0 37.5

resin paraffin deposits exceed known compositions.

Claims (1)

Invention Formula A composition for combating tar-paraffin deposits in oilfield equipment, including a hexane fraction, characterized by The fact that, in order to improve the efficiency of dispersing and dissolving the smoloparaffin deposits, it additionally contains bottoms from the production of butyl alcohols by the method of oxosynthesis with the following ratio of components, wt.%: Hexane fraction 70-90 The bottoms of the production of butyl alcohols I by the method of oxosynthesis 10-30 Table I 96.0 91.0 85.5 10.0 8.5 85.0 23.5 23.0 88.5 21.5 17.5 80.5 20.5 8.5 76.5 72.0 41.5 9.5 Neg. 9.0 otrmts, otr 90 ten Severo-Varyeganskoye 649 hard currency. Table 3 12.14 4.14 12.66 30 74.0 60 90 90.5 96.68