SU920061A1 - Composition for inhibiting paraffin deposition - Google Patents

Description

(54) COMPOSITION FOR THE PREVENTION OF PARAFFINE DEPOSITS

I

The invention relates to the oil industry, namely, to compositions for the prevention of wax deposits in pipelines, and can be used for the completion and transport of paraffinic oils.

Hydrophilizing compounds that prevent the deposition of paraffin on pipe surfaces are known: oxyethylated fatty acids, saponin, albulin, as well as surface-active substances that are used either individually or in combination with detergents and demulsifiers 11.

However, these compositions have not sufficiently high efficiency in dynamic conditions.

The closest to the proposed component composition and the achieved result is a composition for the prevention of paraffin deposits in pipes 2, comprising a methylphosphonic group polyelectrolyte, sodium silicate, polystylenimine and water: in the following ratio of components, wt.%:

Methylphosphonic group polyelectrolyte1.0-2.5

Sodium silicate 1.0-4.0

Polyenshenimine 0.04-0.1

WaterEverything

However, the use of this composition requires the use of a currently expensive polyethylene products (PEI). The collision {consumption of PEI in the known composition, however, leads to a sharp deterioration in the protective

10 properties of the composition.

The purpose of the invention is to increase the protective effect in dynamic operating conditions and reduce the consumption of amine-containing polymer.

15

The goal is achieved in that the composition for preventing paraffin B deposits in wells and communications, including a polyelectrolyte with methylphosphonic grouping, sodium silicate, an amino-containing component, and water, contains the modification product of polyethyleneimine urea of the general formula -dHe-CH -N- as an amine-containing component oh with a mole. weighing equal to 25000-85000 services. units in the following ratio of components, weight Methylphosphonic grouping polyelectrolyte1, 0-2.5 Sodium silicate Modification of polyethylenimine urea 0.025-0.075 WaterOne More The additional content in the composition of ukti modification of polyethylenimine urea enhances the effect of the composition under high dynamic conditions of high centrifugal criterion Relnoyds ( R) more than 50. Example. The composition is treated with the internal surface of the tubing (tubing) of the well. For this, a calculated amount of fresh water (for example, a diameter equal to 2 and a depth of 1000 m requires 2 m of solution), i.e., 1.91 m dissolve 60 kg of water glass. Mixing is carried out by a circulating pump, the air is supplied with the help of an electric motor mixer. After the sodium silicate is completely dissolved, 30 kg of polyelectrolyte with methylphosphonic group are gradually introduced into the above solution. This solution is further stirred for 15 minutes. Then serves the product of modification of polyethyleneimine urea in the amount of 0.7 kg. Stirring continues for another 10-15 minutes. After that, the composition is submitted to the tubing. Next, the wellbore B is left inoperative for 15 minutes to 1 hour. During this period, a complex, hygrophilic film is formed on the walls of the X-ray. According to 1, 0

Famous

1.5

2.5 9

78

Up to 100

0.04

82

Up to 100

3.0. 0.05

98

Up to 100

, 00,10 4 the execution of these operations, the well is put into operation. Dynamic tests are carried out according to the following meta-technique. Pre-cleaned and degreased with hexane and alcohol steel plates tighten in a desiccator. The plate is then immersed in glass cylinders with the proposed composition for 10-15 minutes. The processed plates are then transferred to cylinders of the following dimensions, mm: Height of a cylindrical vessel 120 Diameter of a propeller40 Diameter of a vessel 110 The speed of an electric motor varies between 300-1400 rpm. The selected laboratory mechanics can simulate the hydrodynamic regime of pipeline flows within the required limits of the main criterion for the hydrodynamic criterion for hydrodynamic similarity — the Reynold centrifugal criterion (Re). Cylinder 1 is filled with oil with a temperature of 75 ° C. Circulation of paraffin oil in cylinders with test plates takes 16 hours. The oil temperature in the experiments during this period of time drops to 20 ° C. Next, the plates are transferred to the cylinders with water and evaluate the effectiveness of the composition. Testing the effectiveness of the compositions was carried out on the Bobrovskaya and Pokrovskaya oils of the NGDU Buzulukneft. In these tests, the oil was additionally saturated with 5% paraffin. The compositions are prepared by mixing freshly prepared solutions of the components. The table shows the results of experiments to assess the effectiveness of the known and proposed formulations at the upper, lower and optimal concentrations of ingredients in dynamic conditions.

Proposed

1.0

1.5

2.5 From the data given in the table it is clear that the proposed composition is superior in efficiency known. The use of this composition allows to increase the protective effect in dynamic conditions of work during the extraction and transportation of oil with a high content of paraffin. Formula for the prevention of fallow vapor deposition in wells and utilities, including methylphosphonic group popieeprolite, sodium silicate, amino-containing component and water, characterized in that, in order to increase the protective effect in dynamic working conditions and reduce the consumption of the amino-containing component , as the last part contains the product

0.025 to 100

90

0.035 to 100

96

0.075To 100100 odifikatsii polyethylenimine urea both formulas l-CH, -CH, mol. weight equal to 25000-85000 y. e., with a ratio of Cr,% by weight: Polyelectrolyte with methyl1, 0-2.5 phosphonic group 1.0-4.0 Sodium silicate Product of modification 00, 025-0.075 lithylenimine urea Remaining Water Sources of information, taken in attention during examination 1. Gubnn V. B., et al. Hydrophilisation operator for preventing raffin deposits in pipelines .-- Oilfield, 1975, No. 8, p. 22-23. 2. USSR author's certificate according to the application No. 2632127, cl. C 09 K 7/02, 1978 (prototype).

Claims (1)

Claim Composition for preventing paraffin deposits in wells and communications, including ³⁵ methyl poplite phospholite with sodium phosphate group, sodium silicate, amine-containing component and water, characterized in that, in order to increase the protective effect under dynamic operating conditions and reduce the consumption of the amine-containing component, as the latter composition contains the product of the modification of popietilenimine with urea of the general formula [—CH ₂ —CH ₂ —N — 1 _P C * 0 yng with mol. weighing 25,000-85,000 e., in the following ratio of components, wt.%: Methylphosphonic Polyelectrolyte Sodium Silicate Modification product of urea polyethyleneimine Water