Technological liquid for damping oil and gas hole and method for its preparing

FIELD: oil and gas extracting industry.

SUBSTANCE: invention relates to damping holes in their overhaul repair. Proposed technological liquid used in damping oil and gas holes comprises the following components, wt.-%: microbial xanthane biopolymer, 0.5-2.0; modified starch, 0.2-2.5; surfactant (surface-active substance), 0.01-0.2; sodium carbonate, 0.1-1.0; aluminum power, 0.005-0.08, and water, the balance. Method for preparing indicated aphron-containing technological liquid used in damping oil and gas holes involves mixing its components to obtain two solution wherein one solution contains sodium carbonate and surface-active substance obligatory, and other solution contains aluminum powder. Mixing these solution is carried out at temperature from 50°C to 90°C. Invention provides preparing aphron-containing liquid for damping under static conditions without using special gas-dispersing equipment and based on available reagents.

EFFECT: improved and valuable technical properties of liquid.

2 cl, 3 tbl, 3 ex

 

The invention relates to the oil and gas industry, in particular the killing of wells in their repair.

The kill fluid when the renovations must meet certain requirements regarding their optimal filtration and viscosity characteristics, the control of structural-mechanical properties, preservation of reservoir properties of bottom-hole formation zone, availability of components and other

The main types of process liquids used in the modern practice of killing the well, are the following:

1) potassium chloride solutions [1-3], the main disadvantages are the coagulation of clay particles and precipitation of insoluble precipitation of mineral salts in the channels of the filter layer, the increase of water saturation in a well bore zone and reducing the flow rate of the wells, which was confirmed by the feasibility study [4];

2) the process liquid in the oil (hydrocarbon) [5-9], common deficiencies which should include the standard physico-chemical properties of oil, the need to use complex reagents for regulation and stabilization of technological properties of hydrophobic emulsion solutions, the implementation of several environmental and fire safety when COI is whether the solutions are petroleum-based;

3) the composition of polysaccharide gels for plugging wells and foamable compositions using a mixture of surface-active substances, modified starches or biopolymers, as well as various fillers as mudding - Hydrosol aluminum, caso3and others [10-12]. These fluids are of limited use, in particular they cannot be used for plugging wells that came in late stage of development and is characterized by abnormally low formation pressure (anpd), due to the fact that the composition of these fluids does not provide aeration sufficient to form a stable foam system with low density that is necessary for plugging wells under conditions of abnormally low. Add in the kill fluid chalk (caso3), salts and other solid-phase particles as bridging agents, reinforcing blocking properties, further complicates the process of development wells. This is due to the fact that when developing well removing such liquid, scolytinae layer, is possible only with high depression, i.e. high pressure release, which is absolutely unacceptable for fields with abnormally low. In such cases, dissolution of chalk, sakellaropoulo layer, it is necessary to resort to acid treatment, resulting in significant is velicanu of completion time and reduction of the rate of recovery of the permeability of the reservoir.

To avoid the above complications developed process liquid, which has an anomalously high viscosity at low shear rates and high pseudoplasticity. Usually they are colloidal solutions of biopolymers, in particular microbial polysaccharides at a concentration of from 0.5 wt.% up to 2 wt.% [13]. A distinctive feature of pseudo-plastic fluids is that they have an extremely high shear stress at rest, which may be reduced tenfold with active stirring. Suspension of solid particles, prepared on the basis of colloidal biopolymers, extremely stable, which prevents the formation of sludge, for example, when stopping the drilling tool, as well as in horizontal or tilted plots wells. Another distinguishing feature of pseudo-plastic fluids is that they have low penetrating properties when filtering in the area of the collector.

In recent years, developed drilling muds and fluids for completion, not containing solid-phase mechanical fluid filter, and including efroni - microscopic gas bubbles with a diameter of 20-100 μm, secure complex with two layered membrane consisting of thickened water and surface-act the main substances (surfactants) [14]. For the first time, their description, and the term "efroni", given Fuseboy [15].

The main difference Aronov from conventional foams is that they are surrounded by two membranes with an intermediate layer of water, while the shell of the bubble of air in a conventional foam consists of one monomolecular layer of surfactant. Due to their small size and specific structure efroni have (in comparison with bubbles pins) high mechanical strength and stability.

In the American patent [14], which should be seen as a prototype of the proposed process fluid and a prototype of the proposed method of its preparation, describes the composition and method of preparation of process solution-based polymer additives and specially selected surface-active components, representing a group of empirically selected, synthetic surfactants. As active principle is proposed to use, in particular, dioctylsulfosuccinate sodium, specialty surfactants "Chubb National Foam-High Expansion", which is part of the reagent "Blue Streak", produced by M-I Drilling Fluids, and some other expensive and not readily available components. Described synthetic surfactants give a stable microbubble gas inclusions reducing the overall density of solutions. The advantage of the latter, compared with the usual pins, one is in the fact, that efroni easily pass through even a small cell shale shakers, and under the influence of centrifugal forces in the hydrocyclone and centrifuge emerge and are separated together with clean solution. Thanks to its small size and high strength efroni compared with the pins do not affect the operation of drilling and centrifugal pumps, and is fully compatible with telemetry systems using hydraulic data channel. Due to the elasticity, the hydrophobic nature of the outer surface of microvesicles and their conglomerates (from tens of microns to several millimeters) efroni have the ability to reverse the clogging of a wide range of porous media - from low-permeability Sandstone to fractured limestone with permeability in dozens Darcy, forming on their surface similarity protective shell. Composition-the prototype has a neutral or alkaline pH values achieved by the introduction of various components and, in particular, sodium carbonate.

The main advantage of Aronov before other clogging agents is that they do not form irreversible crusts and blocking the screen on the surface and in the collector and easily dissociate in solution upon removal of the stress. In the known composition of drilling fluids efroni are generated under the influence of high mechanical tension the Affairs and cavitation, for example, in centrifugal pumps, jetting nozzles bits, hydrosocial, hydrocyclones, in the process of compression and decompression of the fluid at the time of movement in the wellbore, etc.

Application of known afrosamurai process fluids in the practice of killing the well and although it seems promising, but is complicated by the fact that the incorporation of air bubbles into the liquid phase occurs only when it is active dispersion and simultaneous capture of air. These processes are natural, if aprosodia liquid is used as the drilling fluid, i.e continuously circulated in the wellbore through the gradient of hydrostatic pressure, through vibrating screens, centrifugal pumps and mixed, trapping the air in the open process vessels. The use of the static process fluid, for example, for killing the well, does not create conditions for autogeneration of Aronov and requires additional getdisplayname equipment, which significantly increases the cost of repair of the well.

Solve the proposed group of inventions task and the expected technical result are developing composition and method of preparation afrosamurai the kill fluid in static conditions without using special is th getdisplayname equipment on the basis of available reagents.

The problem is solved in that aprosodia process fluid for plugging oil and gas wells, including water, surfactant component, surfactant, sodium carbonate and stabilizing and regulating supplements in the form of microbial xanthan biopolymer, modified starch, characterized in that it additionally contains aluminum powder, in the following ratio, wt.%:

Microbial xanthan biopolymer0,5-2,0
Modified starch0,2-2,5
PAV0,01-0,2
Sodium carbonate0,1-1,0
The aluminum powderof 0.005 to 0.08
WaterRest

The problem is solved also by the fact that the method of preparation specified afrosamurai process fluid for plugging oil and gas wells involves the mixing of its components with obtaining two solutions, one of which necessarily contains sodium carbonate and surfactant, and the other is aluminum powder, and mixing these solutions at a temperature of from 50°to 90°C.

Aluminum powder in alkaline conditions created by the presence of soda ash reacts with water at the appropriate temperature the circumstances, perhaps directly in the layer with the formation of micro bubbles of hydrogen, secure complex with two layered membrane consisting of a gelled polysaccharide components of the water and surface-active substances, i.e. Aronov.

The proposed method for the preparation of such afrosamurai process liquid for killing the well is to separate the preparation of two solutions, one of which ("activator") necessarily contains alkaline ingredient and a surfactant component, and the other ("CPU") includes in its composition aluminum powder.

Itself aprosodia the process liquid is prepared by simple mixing of these two solutions is the "activator" and "processor" - in the same container before feeding it into the well with pre-heated to a temperature of + 50°plus 90°or directly in the borehole due to geothermal heating.

We offer aluminum-base gasifier cheap, affordable and environmentally friendly product, with solutions "activator" and "processor" separately, can long be kept in a stable state, and the generation of Aronov will occur only after mixing the inactive components and after heating of the activated solution or in containers, or in the wellbore when the temperature is ISA 30° C. the Use of aluminum-base gas is known and widely used, in particular, in the manufacture of cellular concrete [16]. However, in the literature of information relating to the education of Aronov in gelled polysaccharide solutions containing aluminum and soda and not subjected to mechanical dispersion, no. Therefore, the claimed solution, according to the authors, meets the criterion of "inventive step".

Features of the invention can be illustrated by the examples below.

Example 1. Illustrates the formation of Aronov after addition of the base solution of the aluminum powder and sodium carbonate.

Preparing a basic solution containing microbial xanthan biopolymer brand "Rodopa" 1.0 wt.%, modified starch Phyto-RK (TU-2483-002-4166845222-97) - 2.0 wt.%, Surfactant is sodium lauryl sulfate is 0.025 wt.% (THE 6-09-64-75) and tap water - 96,975%.

In portions of the base solution was made additive anhydrous sodium carbonate (TU 2131-002-44267537-2001) in the concentration range of 0.1-1.0 wt.%, as well as additives of aluminium powder (GOST 5494-95) in the concentration range of 0.005 to 0.08 wt.%. The resulting liquid was subjected to thorough mixing and heating at 80°C for 40 minutes.

The formation of Aronov (micro bubbles of hydrogen was estimated by density obtained Rast the Directors, measured by standard methods in a 25 ml - pycnometric at 20°and atmospheric pressure. The measurement results are summarized in table 1.

Table 1.
The formation of gas-dispersed systems in solutions after adding aluminum powder and sodium carbonate
No. p.pAdditive concentration, wt.%The increase in fluid volume due to the formation of the gas phase (vol.% under normal conditions)The density of the solution at 20°C, g/cm3
Sodium carbonate anhydrousAluminum powder
10001,0301
20,10,0055D0,9800
30,20,01the 9.70,9389
40,30,0325,20,8227
50,40,0540,10,7352
61,00,0869,70,6069

Example 2. Illustrates the stability of the microbubble solution, poluchennogo the classical technology with the use of mechanical dispersion of air (like the prototype), and afronova solution obtained by the method of generating bubbles of hydrogen from aluminum powder.

Preparing the basic solution according to the recipe given in example 1.

To generate Aronov by dispersion solution portion was placed in a closed metal glass blender MPW-302 and subjected to three mechanical stirring. One treatment was 3 minutes, the speed blender 18000 min-1a break between 15-20 minutes. The dispersion of the gas (air) was due to the capture of large air bubbles from the surface of the liquid under the action of the knife high-speed blender.

To generate Aronov using aluminum powder and soda in a portion of the base solution was made additive anhydrous sodium carbonate (TU 2131-002-44267537-2001) at a concentration of 0.4 wt.%, as well as additive aluminum powder of 0.05 wt.% (GOST 5494-95). The resulting liquid was subjected to thorough mixing and heating at 80°C for 40 minutes.

The resulting solutions containing a microbubble dispersion gas (air and hydrogen) in a mixture of basic reagents, was transferred to a glass boxy equipped with ground covers, and thermostatically at different temperatures for a long time. To prevent evaporation of water from the aqueous liquid layer on top was layered liquid hexadecane (5-10 mm). Through the FIC is new intervals certain conditions of experience, samples of the liquid were removed from under a layer of hexadecane using a pipette, they dosaged in graduated econometry, thermostatically at 20°and he measured the density of the weighting method. The results of measurements of the densities of the test samples obtained during the 10 day experience and are presented in table 2 indicate a higher stability of gas-dispersed systems, resulting from the reaction of aluminum powder with sodium carbonate.

Table 2.
Temperature stability of gas-dispersed. systems in solutions obtained by mechanical (M) and chemical method using aluminum powder (A)
No.Conditions of exposureMethod of generating AronovDensity of solution (g/cm3), measured at 20°after exposure of the mixture for h
0122472144240
1The control solution T=22-25°-1,0261,0261,0261,0261,0261,026
2The temperature of 12-15°M 0,60560,79160,88250,97141,00501,0154
3Temperature 22-25°M0,60560,80840,91060,99141,00811,0116
4Temperature 32°M0,60560,85660,97010,99521,01411,0172
5Temperature 43°M0,60560,89930,99160,95911,00121,0151
6The temperature of 12-15°And0,73120,73320,73360,73300,73420,7339
7Temperature 22-25°And0,73120,73400,73400,73400,73400,7331
8Temperature 32°And0,73120,73390,87120,98450,9956with 1.009
9Temperature 43°And0,73120,74650,98150,99811,0015 1,018

Example 3. Illustrates the possible compositions of the two solutions - "activator and "processor". Generation micropezidae systems by mixing equal volumes of two solutions - "activator and "processor", prepared separately for each of the options.

Table 3.
Options mixtures to generate micropezidae systems, prepared by mixing equal volumes of two solutions - "activator and "processor".
Component nameWays of solution No. 1 ("activator")Variants of the solution ("CPU") No. 2
12341234
Microbial xanthan biopolymer, wt.%0,851,251,70,650,851,250,651,7
Modified starch, wt.%0,10,30,51,00,10,30,51,0,
Sodium carbonate, wt.%0,20,60,6 2,00000
The aluminum powder wt.%00000,0010,010,080,16
Surfactants, wt.%0,010,0250,10,20000
Water, wt.%48,8447,82547,146,1549,04948,4448,7747,14

Sources of information

1. RF application No. 2003121616.

2. RF application No. 2003126134.

3. RF patent №2250360.

4. Pop G.S., Kucerovsky V.M., Goresh P.A. Techno-economic analysis of the effects of process fluids to the bottom zone of productive layers of gas condensate fields // Overview. Ser. Development and exploitation of gas and gas condensate fields. - M: IDC Gazprom, 1995. - 101 S.

5. RF application No. 2003129052.

6. RF patent №2255209.

7. RF patent №2264531.

8. RF patent №2258802.

9. RF application No. 2005108303.

10. RF patent №2246609.7.

11. RF application No. 2005108303.

12. RF patent №2266394.

13. Anderson B.A., Gabdullin N.T., Gilyazov P.M., Kondrashev OF Physico-chemical basis for the use of polysaccharide drilling fluids for for the animania wells Ufa: Monograph, 2004. - 247 S.

14. U.S. patent No. 5881826.

15. Felix Sebba, "Foams and Biliquid Foams-Aphrons", Virginia Polytechnic Institute and State University, pp 62-69, 1987.

16. Favrin, Rcrca. Chemical additives in construction. M.: stroiizdat, 1964, 287 S.

1. Aprosodia process fluid for plugging oil and gas wells, including water, surfactant component, surfactant, sodium carbonate and stabilizing and regulating supplements in the form of microbial xanthan biopolymer, modified starch, characterized in that it additionally contains aluminum powder in the following ratio, wt.%:

Microbial xanthan biopolymer0,5-2,0
Modified starch0,2-2,5
PAV0,01-0,2
Sodium carbonate0,1-1,0
The aluminum powderof 0.005 to 0.08
WaterRest

2. The method of preparation afrosamurai process fluid for plugging oil and gas wells according to claim 1, comprising mixing components with obtaining two solutions, one of which necessarily contains sodium carbonate and surfactant, and the other is aluminum powder, and mixing these solutions at a temperature of from 50 to 90°C.



 

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2 tbl, 7 ex

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4 ex, 1 tbl

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1 tbl, 2 ex

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