Composition for regulation of oil field development

 

(57) Abstract:

The invention relates to the oil industry, in particular, compositions based biopolymer, namely, an exopolysaccharide produced by a strain of Azotobacter vinelandii (Lipman) FC-1 VKPM B-5933, to regulate the development of oil fields. The technical result is to increase the efficiency of water compositions, enhancing their ability to resist washout injected into the well water, the possibility of carrying out insulation work in a wide temperature range. Composition for regulation of oil field development, including the exopolysaccharide produced by a strain of Azotobacter vinelandii (Lipman) FC-1 VKPM B-5933 in the culture fluid, chromalive alum and water, further comprises a sodium or potassium salt of carboxymethyl cellulose in the following ratio, wt.%: the specified exopolysaccharide 3,0 - 10,0, chromalive alum 0,05 - 2,0, sodium or potassium salt of carboxymethylcellulose 0,05 - 2,0, water the rest. 3 table.

The invention relates to the oil industry, in particular, compositions based biopolymer, namely, an exopolysaccharide produced by a strain of Azotobacter vinelandii (Lipman) the deposits flooding one of the main methods of enhanced oil recovery are physical and chemical methods of control seepage water. This is done by selective isolation, blocking highly permeable, well-drained areas viscoelastic compositions, gel-based polymers (polyacrylamide PAA, carboxymethylcellulose CMC, GIPAN and others), silicate-alkali exposure, sedimentation formulations based on, for example, organic silicon compounds, etc. In this regard, one of the most promising reagents are based on natural and synthetic biopolymers, as well as cellulose ethers.

Known gel-forming composition for the treatment of oil wells, containing a simple ester of cellulose, an inorganic salt of trivalent chromium, in particular chromecacheview alum, alkali and water (ed.St. The USSR №1392077). As a simple ether is used acetylcellulose, goldirova acetylcellulose or a mixture of carboxymethylcellulose with acetylcellulose and optionally sodium or potassium salt of hydrochloric or nitric acid and the sodium or potassium salt of orthophosphoric acid. Widely used for the development of heterogeneous permeability and oil saturation oil as surfactant sodium carboxymethylcellulose (Na-CMC) (U.S. Pat. Of the Russian Federation No. 2107812).

The main disadvantage of komponentov gelation excludes the injection of a specified composition in deep low-permeability reservoirs.

For regulation of oil field development uses a variety of biopolymers, for example solutions heteropolysaccharide produced Xanthomomas campestris (ed. St. USSR №1051226), Acinetobacter sp. (ed.St. The USSR №1726732).

Known heteropolysaccharides, including xanthan gum, do not provide the desired changes in filtration resistance with all the variety of geological conditions.

Known composition for regulating the development of oil deposits, containing an aqueous solution of polyacrylamide and as a cross-linking agent chromecacheview alum (ed.St. The USSR №985255). However, this composition is not effective at low concentrations of the polymer due to the active cation adsorption of chromium on the rock at high concentrations of polymer, resulting in a decrease in strength of cross-linked polymer. The increasing of concentrations included in the composition of components is inadmissible for reasons of environmental safety.

Known composition for isolating the flow of formation waters, including the exopolysaccharide (EPS) produced by the strain of Azotobacter vinelandii (Lipman) FC-1 VKPM B-5933 in the form of cultural liquid, silicate clay mineral and water. As silicate clay mineral ispolzuya of exopolysaccharide, produced by the strain of Azotobacter vinelandii (Lipman) FC-1 VKPM B-5933 in the culture fluid, it has become possible to reduce the size of the clay in the working solution, without compromising the technological parameters of the injection solution.

A disadvantage of the known compounds is low and the flow rates of the solution, poor filtration characteristics, the inability to operate in a wide temperature range.

The closest technical solution to the claimed composition is a composition for regulating the development of oil fields by isolating the flow of formation waters, including the exopolysaccharide produced by a strain of Azotobacter vinelandii (Lipman) FC-1 VKPM B-5933 in the culture fluid, chromecacheview alum and water (U.S. Pat. RF 2107811, 27.03.1998).

However, this composition is not sufficiently effective due to insufficient strength of the crosslinked polymer and the inability to use the composition at temperatures above 60°C.

The technical result of the present invention is to improve the efficiency of water compositions, enhancing their ability to resist washout injected into the well water, the possibility of carrying out insulation work in a wide interval t is Farid, produced by the strain of Azotobacter vinelandii (Lipman) FC-1 VKPM B-5933 in the culture fluid, chromalive alum and water, further comprises a sodium or potassium salt of carboxymethyl cellulose in the following ratio, wt.%: the specified exopolysaccharide 3,0-10,0, chromalive alum 0,05-2,0, sodium or potassium salt of carboxymethylcellulose 0,05-2,0, water the rest.

The study of rheological and waterproofing properties of the samples of the inventive compositions was carried out on models of the cores. Used in the experiments equipment:

the Brookfield viscometer (Brookfield - LVT) with interchangeable spindles LV-1, LV-2, LV-3; (Brookfield Engineering Laboratories, Stoughton, Mass., USA);

- viscometer - funnel Ford;

mixer: a laboratory centrifugal and magnetic.

In table.And the physico-chemical characteristics of CMC samples used in the study.

Salt of CMC is quite soluble in fresh (tap) water at room temperature. While CMC swells the particles in the water are collapsed into a rounded granules of white color, becoming as the penetration of water in them colorless. With stirring, magnetic or paddle stirrer 0,05-2,0% aqueous solutions with complete dissolution is xperimenta.

Sample preparation: Samples of the compositions were prepared by serial dilution of the components. Dissolved salt of CMC in the entire volume of water (by calculation), then added the exopolysaccharide, then typed chromalive alum (SG alum). Chromalive alum can be entered in a mixture of salt of CMC and exopolysaccharide both in solution and in the form of crystals (powder).

The stability properties of the samples of the compositions were evaluated by visual observations and re-rheological studies. To evaluate the effectiveness of the inventive compositions applied method of determining changes in the magnitude of proactivamente water through the model of the core. As model core used quartz sand Lytkarino field (fraction - 315+200 µm) placed in research rounds (tube) with a volume of 50 cm3. In the process of loading the cartridge, the sand was carefully condensed tapping rubber tube. From the bottom of the cartridge was mesh, sandwiched coupling nut. The top cartridge in the cap nut has forcively tube through which was carried out by feeding the reactants (water, compositions).

In the loaded cartridge was filled with water and determined its proactivenet (velocity) through the beam, if the sample is not passed through the core under the action of atmospheric pressure (gravity), its supply in the cartridge was performed using a weak vacuum (water pump) - 0.1-0.2 ATM. After passing through the core sample composition in an amount of 2-3 volumes of pore space supply was stopped and the Chuck is closed at the top and bottom plugs. In this position he was left for 2-3 days, after which the newly determined value of proactivamente water. If no leakage under the pressure of the water column in the tube above the cartridge (gauge pressure of about 100 mm of water. Art. or 0.01 ATM) connected vacuum (0.1-0.2 ATM). The ratio of proactivamente before and after processing cores studied composition gave a value of its reduction and served as an estimated measure of the efficiency of the samples. The results are shown in table.1.

Aqueous solutions of salts of CMC is well compatible with solutions of EPS, with no significant changes in the rheological properties of the mixtures (table.1, samples 1 and 2). Both reagent (CMC and XPS) are derivatives of cellulose, have similar molecular structure (on the basis of glycosidic rings). However, this mixture is unstable and on the 7th day of storage stratified by education stroma loss of biopolymer precipitated in the form of large flakes and lumps. The same alum cause thickening of reagents salt CMC without dropping them into the sediment (table.1, samples 3-6). The structure of samples of two-component composition is not strong, easily destroyed by stirring and was never rebuilt.

Samples of viscous, homogeneous and externally stable systems were obtained in the three-component compositions containing a salt of CMC, XPS and K-Cr alum. Physico-chemical and rheological properties of such mixtures are changed within the first 0.5 to 1.0 h (table.1). At the same time the beginning of the thickening system should be considered as the date of introduction of the mixture of EPS and salt CMC ramkalawan alum.

The composition with the desired characteristics and expenditure ratios of components (concentrations of reagents CMC, EPS-SG alum) were selected experimentally.

The viscosity of the system XPS+CMC+K-SG alum increases rapidly when it is >2,0% salt of CMC. The most intensive process occurs already after 0.5 h, fixed large gelatinous education (lumps). After 1-2 h in them formed a powerful consolidated system with high viscosity and strength of the structure. When pouring from one vessel to another such system moves (moves) single CGUs OSU funnel Ford becomes impossible, in the same viscometer Brookfield spindles were often broken the lesion into smaller components (pieces), accurate determination of the viscosity of which is difficult.

Using the Brookfield viscometer was able to clarify the magnitude of the incubation period, the sample of the inventive composition is about 2.5 hours before a substantial increase in viscosity, timed with the help of this device (i.e. >200 MPa·at the speed of 0.3 rpm).

The viscosity of samples with reagent CMC at a concentration of 0.05% increased somewhat less rapidly than the concentration of 2.0%. However, the “lumps” were formed through half an hour after cooking. To get acceptable speed “setting” has been a decrease in the concentration of EPS.

A series of experiments to determine the concentration of EPS in the mixture with the salt of CMC and alum showed that the decrease in EPS (up to 10%) can significantly reduce the slew rate viscosity systems involving CMC salt.

Viscosity growth in almost all samples despite their frequent stirring during re-rheological studies have shown the processes of recovery of the destroyed structures, which in General ol the structure of its viscosity. In this regard, the question of the composition, i.e. the concentration of individual components and, accordingly, on the technological properties of the composition, can be solved by the answer to another question - about the size of the required viscosity of the system.

Focusing on the average values of effective viscosity is not more than 50 PA·with (at the speed of 0.3 rpm) and the content in the system 0,05-2,0% of the specified salt of CMC, technological concentration of EPS can be considered as the amount of 3-10%. Higher content of EPS is impractical due to the high viscosity of the resulting system and unnecessary consumption of EPSS. Fewer leads to the formation of weak, easily destructible patterns, the effectiveness of “work” which in the conditions of formation requires a special study on models of the cores.

- higher rate of dissolution at room temperature (with stirring in 1.5 times, without stirring 2 times);

- compositions (mixtures) have extensive incubation period start “setting” (thickening) of no less than 2.5 hours from the moment of introduction into the system of alum (against 0.5 h the prototype without CMC);

- a more gradual increase of viscosity;

- more stable rheological properties over time.

Ucom, and its use in, for example, Arlan field more acceptable.

As follows from the obtained data, the content of alum less than 0.05% leads to weak salustiano system, the viscosity of which two days is 1.6 PA·with (at the speed of 0.3 rpm). The content of alum to 2.5% leads to extremely rapid salustiano system, the viscosity of which is already 2 h after production is 22 PA·with (at 0.3 rpm). The state of the system is characterized by an almost complete loss of fluidity. Consumption of alum in the amount of 0.05 to 2.0% allows to achieve a sufficiently gradual increase of the viscosity with an incubation period of not less than 2 h in Addition, the strength of the structure increases with time independently in static or in dynamic conditions (with a weak mixing system spindle viscometer).

Thus, to develop compositions the concentration of K-SG alum of 0.05 to 2.0% as possible.

The results of the evaluation experiments to determine changes in the magnitude of proactivamente water under the action of the processing model core developed formulations based on EPS (5,0%), salt, CMC and ramkalawan alum (1%) is shown in table.2.

As slideelement water through the core. Changing the supply pressure of water (vacuum of 0.1 ATM), managed to cause seepage through the core. Thus, the evaluation experiments to determine the effectiveness of actions designed compositions based on the specified salt of CMC, XPS and ramkalawan alum on models of the cores showed the promise of three-component systems.

Thus, research has allowed us to develop a composition satisfying the following requirements:

1) the obtained composition has an incubation period of thickening (after the introduction of alum) for at least 2 h;

2) formed dense (in a day), a gelatinous mass with a viscosity of more than 10 PA·with (at shear rates less than 1.0 with-1) has high stability and delaminate for a period of not less than one month;

3) XPS and these salts CMC actively interact with chromalive alum, which lead to significant thickening of their solutions.

A characteristic feature of real porous media, especially with polymineral composition collectors and high reservoir temperature, is a strong ability to adsorb and to destroy the effect of reservoir temperature, mechanical and biological the stand environment and stop useful work by additional washing and Davitashen oil. As shown by theoretical, laboratory and field studies, injection of a composition consisting of an exopolysaccharide produced by a strain of Azotobacter vinelandii (Lipman) FC-1 VKPM B-5933 in the culture fluid, salts of CMC and ramkalawan alum, significantly improves the efficiency of chemicals. The composition has a high activity, adsorbing a large number of chemicals on the surface of the medium, thereby increasing their Neftekhimiya properties. The exopolysaccharide with salt CMC form micelles that when the temperature is strengthened and selectively distributed throughout the layer according to their size and the diameter of the pore channels.

The claimed composition, except Arlan field tested on Atinskom (layers B-8 and a-1,2) and Megion (layer a-1, 2) elds. Watering in producing wells at the site of exposure decreased by 10-30%.

The set of results obtained under these experimental conditions and analysis can be recommended to conduct field tests on Arlan field.

Composition for regulation of oil field development, including the exopolysaccharide produced stamato it further comprises a sodium or potassium salt of carboxymethyl cellulose in the following ratio of components, wt.%:

The specified exopolysaccharide 3,0 - 10,0

Chromalive alum 0,05 - 2,0

Sodium or potassium

carboxymethyl cellulose 0,05 - 2,0

Water The Rest



 

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