Reagent for enhanced oil recovery, with the effect of the destruction of oil-water emulsions, corrosion inhibition and asphaltoresinparaffin deposits and desulfurization of oil

 

(57) Abstract:

The invention relates to the oil industry, in particular reagents for enhanced oil recovery. The technical result is to provide comprehensive actions - enhanced oil recovery, destruction of oil-water emulsions, corrosion inhibition and asphaltene-resin-paraffin deposits and desulfurization of crude oil. Galactomannan used as a reagent for enhanced oil recovery, with the effect of the destruction of oil-water emulsions, corrosion inhibition and asphaltene-resin-paraffin deposits and desulfurization of crude oil. table 2.

The invention relates to the oil industry, in particular, to reagents for enhanced oil recovery.

The method for extracting liquid hydrocarbons (options), including the injection of a foaming solution containing synthetic or biopolymer, a surfactant, an aqueous solvent and the gas in the underground formation with cracks through one of the wells and the extraction of liquid hydrocarbons through the second hole (see RF patent №2071554, MKI E 21 In 43/22, publ. 1997).

This method is used for the insulation vertically is ora, as for the oil extraction requires the injection of the displacing fluid.

Known composition for breaking oil-water emulsions and wastewater treatment, with the effect of inhibiting hydrogen sulfide and carbon dioxide corrosion and asphaltene-resin-paraffin deposits (see RF patent №2152425, MKI With 10 G 33/04, publ. 2000)

Known composition does not possess sufficiently high demulsifying activity and does not promote the desulfurization of crude oil.

Known methods of neutralization of hydrogen sulfide in the oil well, comprising pumping a definite volume of neutralizing fluid-a mixture of polyglycerol with an aqueous solution of sodium chloride, which is injected into the bottom zone of the well (see RF patent №2136864, MKI E 21 In 43/22, publ. 1999).

The disadvantage of this method is that the processing of a neutralizing liquid is subjected to the well bottom-hole zone and does not provide remote from the bottom zone areas of the layer.

The closest in technical essence and the achieved effect is the method of increasing oil recovery from oil wells, including injection into the injection well an aqueous solution of starch and exopolysaccharide produced by Azotobacter vinelandii (Lipman) f is (see RF patent №2125648, MKI E 21 In 43/22, publ. 1999).

The disadvantage of this method is that used polysaccharides are not agents of complex action.

The present invention is the task of creating a high-performance environmentally friendly reagent for enhanced oil recovery, with the effect of the destruction of oil-water emulsions, corrosion inhibition and asphaltene-resin-paraffin deposits and desulfurization of crude oil.

The problem is solved by the use of galactomannan as a reagent for enhanced oil recovery, with the effect of the destruction of oil-water emulsions, corrosion inhibition and asphaltene-resin-paraffin deposits and desulfurization of crude oil.

As a reagent for enhanced oil recovery using galactomannan, representing heteroglycan contained in the seeds of leguminous plants. Commercial preparations of galactomannans called gums, which receive water extraction of polysaccharides from the crushed plant material. As the galactomannans are used guar gum, or karaya gum, or xanthan gum, or carob gum long mixtures thereof in any ratio of the gum used in food, paper and other industries as adhesives, stabilizers of emulsions and suspensions (see “Great Soviet encyclopedia”. Moscow: Publishing house “Soviet encyclopedia”, 1973., page 737).

Injection of galactomannan produced by pre-mixing it with water, followed by injection or by injection into the conduit or tubing using, for example, ejection pump with such speed that the concentration of galactomannan in the water was of 0.001 to 2.0%. For more efficient use of galactomannan you can pre-make a mixture with water in the mixer mill type, for example in retrochallenge mill with a rotor speed of 3000 rpm, which occurs simultaneously with the dissolution of galactomannan and grinding. For the preparation of galactomannan use water with different salinity. In the mixing of galactomannan with water, it forms a viscous gel that effectively displaces oil from both homogeneous and heterogeneous permeability reservoirs. Moving on to the reservoir, the reagent reacts with the oil, as if absorbing her, and brings with him from the pore space. Acively reagent, having neftehimichwsky properties, while blocking large pores and contributes to the displacement of oil from the fine pores. Next, download the displacing agent is water, the solution of surface-active substances and other oil-driving agents.

The inventive reagent can be used for enhanced oil recovery and achieving all of the claimed effects storagename, for example, surfactants, water soluble polymers, stabilizing additives, corrosion inhibitors and bactericides.

A new set of declared essential features allows you to get a new technical result, which is expressed in enhanced oil recovery operations with concurrent complex influence on the produced products.

The analysis selected in the search process known solutions showed that in science and technology there is no object, similar to the claimed combination of features and high efficiency in enhanced oil recovery, which allows to make a conclusion on the compliance of the claimed invention, the criteria of “novelty” and “inventive step”.

To prove compliance of the claimed invention, the criterion of “PR is reamers determine the effectiveness of the use of this reagent for enhanced oil recovery. Efficiency is determined by the growth rate of oil displacement.

Define the following physicochemical characteristics: surface and interfacial tension using stalagmometer method and viscosity using viscosimetry VPI-2. The research results are summarized in table 1. As can be seen from table 1, the applied reagent has high physical and chemical characteristics.

Research on the effectiveness of the use of the reagent is performed on the models of heterogeneous oil reservoir, composed of two hydrodynamically unrelated raznoprofilnyh glass tubes long 100 cm and a diameter of 2 cm of Tube fill with crushed rock. Set the value of the permeability receive a specific set of fractions of the breed. Prepared tubes under vacuum saturated with formation water. To create the water saturation of the models displace oil, to obtain a residual oil saturation oil to displace full of water production at the outlet of the porous medium. Later in the model injected reagent and continue the displacement of water. Carried out measurements of the hydrodynamic parameters of the model.

The research results are summarized in table 2.

is Tracii in the amount of 15%. Next, fetch the water. The residual resistance factor is 11,9, and an annual growth rate of oil displacement is 16.1%(see tab. 2, example 1).

Examples 2-7 carried out analogously to example 1, using various components and by varying their content.

Example 8 (prototype). In the model of heterogeneous oil reservoir consistently zamachivayutsya solution containing 0.005 g of exopolysaccharide, 5.0 g of starch and 94,99 g of water, is then pumped aqueous solution containing 0.1 g of exopolysaccharide and 99.9 g of water. The residual resistance factor is 6.2, and an annual growth rate of oil displacement is 9.3% (see tab. 2, example 8). The resulting compositions are tested for effectiveness.

Further experience reagent for demulsifying activity, for this purpose, the emulsion NGDU “Almetyevneft” density 1,105 g/cm3original water content of 51%, the content of iron sulfide 1058,4-2653 mg/l Reagents are dosed into the emulsion in the form of 0.8% aqueous or alcohol solution. The determination of the content of residual water in the oil is carried out in accordance with GOST 14870-77 method Dean-stark.

Anticorrosive properties of the reagent evaluated according to GOST 9-506-87, OST 39-099-79, GOST 9.505-86 method.

The degree of wastewater treatment op is="ptx2">To launder the oil film.

The particle size of the dispersion.

To launder ARPD.

Determination of washing the oil film is carried out in the following order. In a glass tube to a certain label pour the oil treated with the reagent from the calculation of 0.005% on an active basis and stand for 20 minutes. Then the oil was poured in a test tube halfway pour produced water, add oil up to the mark. The tube is closed refinished tube, and then simultaneously turn on the stopwatch test tube is turned. Oil and water are changing volumes. Record the area of washing the surface of the tube occupied by the reservoir with water instead of oil. The result is excellent, if when 70% of the area is 30 seconds, good for 60 seconds and satisfactory for 180 sec. The dispersion of paraffin and washing the surface.

These two methods are combined in one procedure and are carried out in a conical flask, which is placed 50 cm3the reservoir water, dispense the test reagent. In the same flask ASPO weight of 0.5, the Contents of the flask are heated to melt the wax (60 to 90°C) and then cooled while stirring. After cooling to 20-25°With the measured particle size of the dispersion of paraffin () and square Ratsa excellent - when the value of variance of 1-2 mm, satisfactory when the value of variance of 2-5 mm, unsatisfactory when the value of variance of more than 5 mm In the evaluation method of washing the deposits from the surface, the result is considered excellent if the share of natural stone surfaces from ASPO is 90-100%, good - 80-90%) and poor - less than 50%.

For determination of total sulfur in samples of oil are processed samples of 200 ml of 0.8% aqueous solution of the reagent in 20 ml of oil. Analysis of the percentage of sulfur in the samples of oil carried out according to the method described by Y. Y. Lurie, A. I. Rybnikova “Chemical analysis of industrial wastewater” (1974).

The results of the test compounds on efficiency and their qualitative and quantitative characteristics are presented in table 2.

As can be seen from table 2, the proposed reagent effectively displaces oil from reservoirs of different permeability with simultaneous complex influence on the produced products.

The use of the reagent allows

- to increase the growth rate of oil displacement in oil reservoirs with different permeability with water content up to 98%,

- effectively apply in layers with the presence of water to any mineralbearing corrosion and asphaltene-resin-paraffin deposits, to reduce the sulfur content in crude production.

The use of galactomannan as a reagent for enhanced oil recovery, with the effect of the destruction of oil-water emulsions, corrosion inhibition and asphaltoresinparaffin deposits and desulfurization of crude oil.



 

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