Composition for isolating the flow of formation waters

 

The invention relates to the oil industry. Composition for isolating the flow of formation waters in the renovation of injection wells for sealing cracks and holes formed in its walls, includes the exopolysaccharide produced by a strain of Azotobacter vinelandii (Lipman) FC-1 VKPM B-5933 in the form of cultural liquid, silicate clay mineral and water. The composition additionally contains chromalive alum and as a silicate clay mineral used palygorskite in the following ratio, wt. %: the exopolysaccharide 5,0-15,0, chromalive alum 0.05 to 0.15, palygorskite 2,5-7,5, water - the rest. The composition provides improved resistance to leaching injected into the well water, the possibility of carrying out insulation work in a wide range of temperatures, significantly improves the efficiency of chemicals. 2 Il., table 2.

The invention relates to the oil industry, in particular, compositions for isolating the flow of formation waters in the renovation of injection wells for sealing cracks and holes formed in its walls.

Known composition for regulating the development of oil fields by Yves-5933 in the culture fluid, chromecacheview alum and water (U.S. Pat. RF 2107811). However, this composition is not sufficiently effective due to the low strength of the crosslinked polymer and the inability to use the composition at temperatures above 60oC.

In the known technical solutions as silicate clay mineral used bentonite clay bentonite according to OST 39-202-86 (U.S. Pat. RF 2078917, 2086758). Download clay suspension into the well mainly produced separately from solutions of biopolymers. The use of clay suspension was reduced reagent consumption by 5-7 times in the receipt of the same technological effect. The concentration of clay was chosen depending on the permeability of the reservoir, i.e. the injection well, and it could fluctuate from 0.5 to 25%.

The closest technical solution to the claimed composition is a composition for isolating the flow of formation waters, including the exopolysaccharide produced by strain Azolobacler vinelandii (Lipman) FC-1 VKPM B-5933 in the form of cultural liquid, silicate clay mineral and water (U.S. Pat. RF 2128283). As clay silicate mineral used bentonite. Through the use of an exopolysaccharide produced by a strain of Azotobacter vinelandii (Lipman) FC-1 VKPM B-5933 as the culture fluid is at his solution.

The disadvantage of this composition is low and the flow rates of the solution, poor filtration characteristics, the inability to operate in a wide temperature range.

The purpose of this invention is to improve the efficiency of water structures, enhancing their ability to resist washout injected into the well water, the possibility of carrying out insulation work in a wide temperature range.

This goal is achieved through the use of a composition for isolating the flow of formation waters, including stolichani produced by strain Azotobacter vinelanclii (Lipman) FC-1 VKPM B-5933 in the form of cultural liquid, silicate clay mineral and water. The composition additionally contains chromalive alum and as a silicate clay mineral used palygorskite in the following ratio, wt.%: The exopolysaccharide - 5,0-15,0 Chromalive alum 0.05 to 0.15 Palygorskite - 2,5-7,5 Water - the Rest Palygorskite (mountain leather) is a silicate clay mineral subclass of chain silicates of Mg5/Si4O10/2(OH)44H2O, light gray units leathery, fibrous structure. Mainly used Audiodatarate and the impossibility of making clay suspensions with the required properties.

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 effects of injected reagents in them. For this reason, the latter quickly cease to exist in a porous medium and discontinue 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 Azotohacter vinlandii (Lipman) FC-1 VKPM B-5933 in the culture fluid, palygorskite and alum, significantly improves the efficiency of chemicals. Fine fibrous medium PA the basis of palygorskite has a high activity, adsorbing a large number of chemicals (exopolysaccharide, alum). In addition, adsorbed on the surface of particles of palygorskite the exopolysaccharide and alum attach to the hydrophobic surface of the particles, thereby increasing their Neftekhimiya properties. The exopolysaccharide in a fine environment of palygorskite forms micelles that when p is orovich channels.

In the manufacture and repair of suspension type claimed components contributing to the formation of large, high-viscosity (solid) blocks of clay particles surround coagulation structure.

In the laboratory prepared samples of clay-polymer suspensions and determine their physico-chemical and rheological properties.

The chemical composition of the used model of the reservoir water Samotlor field is specified in table 1.

Suspension samples were prepared at 20oWith in the following way. A portion of the exopolysaccharide was placed in a porcelain Cup, poured a measured amount of produced water and stirred using a paddle stirrer for 10 min at a speed of 800 rpm for 10 min at a speed of 1300 rpm). Without stopping the stirring, was added a solution of alum in distilled water (amount of water, followed by dissolving alum, was taken into account in the total amount of water in suspension), then the system is stirred for another 5 min at 1300 rpm without stopping the stirring was added a portion of palygorskite and the suspension is stirred for another 5 min at 1300 rpm, the resulting suspension was poured into a glass for holding rheological studies after a certain period of time (without stirring). polimernoi composition; - the nature of the resulting sediment (particle size, the presence of flakes, large blocks of particles, not collapsing under the action of shaking the system); - the type of rheological curve of clay-polymer systems; - the dynamics of the rheological properties of the system (increasing viscosity).

In table 2 and Fig. 1 and 2 presents the main results of the research.

From the data presented in table 2, it follows that the quality and quantity of alum and palygorskite has a significant impact on the process of forming the volume of coagulation structure (ACS).

In samples a, B, formed a large volume of the precipitate, consisting of large sticky particles and flakes of palygorskite, which are not destroyed even with vigorous shaking of the sample. In samples D, e, F sediment has the form of a fine mist with a small amount of flakes easily vspuchivaetsja and slowly settles. Precipitation samples a, B and C has hydrophobic properties, and will not stick to the glass walls of the vessel and when the tilt cylinder begin to move as a single unit, which allows to state education volume coagulation system (ACS).

In Fig. 1 shows the rheological curves of the samples and, As can be seen, vysokopatogennyj rest of the order of several tens of PAsince, at low shear rates becomes fluid (viscosity at the shear rate from 0.3 to 1.5 sec-1decreased almost PA order). The viscosity of A sample is more gradual with increasing shear rate from 0.3 to 1.5 sec-1reduced 4.5 times.

The viscosity in this case characterizes the strength of the resulting structure, therefore, the change in viscosity over time describes the change in the strength of the emerging coagulation system. In Fig. 2 shows the dynamics of changes in the viscosity (strength) patterns of samples a and G at the shear rate of 0.3-1. As can be seen, the viscosity of the sample And varies slightly, weakly increasing, respectively, and the strength of the structure of the sample And virtually no increase. The viscosity of sample G increases rapidly over time, which involves the successive formation and strengthening volume of coagulation patterns of sediment in the static conditions of the present experiment (or quasi-static conditions of the reservoir).

Thus, only the use of the claimed composition can be achieved forming the volume of coagulation structure.

The composition was tested on Atinskom (layers B-8 and a-1,2) and Megion (layer A-1,2) mestro the 2mm;">
Claims

Composition for isolating the flow of formation waters, including the exopolysaccharide produced by a strain of Azotobacter vinelandii (Lipman) FC-1 VKPM B-5933 in the form of cultural liquid, silicate clay mineral, and water, wherein the composition further comprises chromalive alum and as a silicate clay mineral used palygorskite in the following ratio, wt.%:
The exopolysaccharide - 5,0-15,0
Chromalive alum - 0,05-0,15
Palygorskite - 2,5-7,5
Water - Ostalnoe

 

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