Foamable composition for repairs in the well

 

(57) Abstract:

The invention relates to the oil and gas industry, in particular foaming compositions, and can be used when carrying out repair work in the borehole as a liquid for killing wells. The stability of the composition to the action of liquid hydrocarbons is achieved by dissolving (2.0 to 3.0 wt.%) bentonite in water to swell. Then with stirring, wt.% : triethanolamine salt of alkyl sulphates 2,0 - 4,0, 16% solution of giana ( =1080 kg/m3) 3,0 - 4,0, aluminum hydroxide of 0.2 - 0.4. The resulting mixture is brought to 100 wt.%, Prilepa water.

The invention relates to the oil and gas industry, in particular foaming compositions, and can be used when carrying out repair work in the well as mud wells.

Known foamable composition containing the following components, wt. The foaming agent (sulfonic acid) 1.5 Stabilizer (CMC) 1 Bentonite 20 Water the rest

Amen C. A. and other Dissection and exploration of oil and gas reservoirs. M. Nedra, 1980, S. 114-119, 310-316).

The lack of structure instability to the action of hydrocarbons, due to the structure of the prisoner the comfort expressed by the electrostatic force of attraction. The layers consist of a water-soluble anionic CMC groups (anionic polymer) [(C6H9O4)OCH2COO]-, anions SO32-sulfonic acid and clay particles that carry a negative charge. In addition, the high concentration of bentonite in the long term repairs and if possible destruction of foam on the bottom hole leads to the blockage of the pore channels of the layer of fine particles of bentonite.

A prototype of the invention adopted foamable composition containing the following components, wt. Bentonite 1-3 Foaming agent (such as sulfonic acid) 1-3 Polyacrylamide 0,5-0,7 Condensed selfidentify bard (kssb-4) 5-3 Water the rest

The lack of structure instability to the action of hydrocarbons, due to the structure of the film, namely the structural instability of adsorption layers that do not provide full electrostatic binding of anions SO32-sulfonic acid and kssb (anionic surfactant), as well as particles of clay, and the balance of the system in this case is due to the dipoles of water. Upon contact with a heavy hydrocarbon radicals (oil, gas condensate) observed fast (2-3) the destruction of the film, forming bubbles of the air is of glendorado.

This goal is achieved by foaming a composition comprising bentonite, water-soluble polymer of acrylic series, anionic surface-active agent (surfactant) and water, which additionally contains aluminum hydroxide, and the polymer is hydrolyzed polyacrylonitrile (gipan), as an anionic surfactant triethanolamine salt of alkyl sulphates with the length of the alkyl chain of 7-12 carbon atoms (TAAS) in the following ratio, wt. Bentonite 2.0 to 3.0 Gipan 3-4 TEAS 2,0-4,0 aluminum Hydroxide of 0.2-0.5 Water the Rest

The bentonite used in OST 39-202-85 on clay of different brands. The authors have used the clay of the following brands: PBB (the main mineral montmorillonite), BCP (basic mineral palygorskite), PKGD (the main mineral carinatogecko). The effects of these brands of clay in the foamable composition is identical.

The gipan use THE 6-01-166-74. Get it by hydrolysis of polyacrylonitrile in an alkaline medium 100aboutC. Is a high-viscosity liquid 10-20% concentration.

General formula:

CH2----< / BR>
The main chain of the polymer contains 63-80% carboxyl (-COO-), 10-27% of the amide (-COONH2) and 1-10% nitrile (-CN) groups. Is Vysokomolekulyarnye without other mechanical impurities completely at 20aboutWith 1000-1200 kg/m3c kinematic viscosity at 20aboutWith no more than 60.10-3m2with a freezing point not below (-8)aboutnot explosive, non-flammable, non-toxic. General formula: CnH2n+1OSO3NH(C2H4OH)3where n 7-12. Is an anionic surfactant.

Aluminum hydroxide (hydro-argillite, gibbsite) use according to GOST 11841-76. Represents a monoclinic crystals white, practically insoluble in water.

When mixing the composition, the formation of 3-phase foam system. The orientation of the molecules in the film surrounding the bubble of air formed structural adsorption layers can be represented as follows. Molecules TEAS oriented water-soluble anionic part to the dipoles of water bubble and insoluble hydrocarbon radical to the air part of it.

TEAS having a straight hydrocarbon radicals, has advantages with respect to surfactant containing in the structure of cyclic radicals, because it has a significant stabilizing ability in relation to disperse systems and the most pronounced effect of reducing the surface tension.

Molecules Hiawatha, and insoluble hydrocarbon radical to the air part of it.

Particles of bentonite, having a negative charge on the surface, is also adsorbed on the cation of giana.

Between oppositely charged particles have electrostatic forces of attraction. In addition, in alkaline environments is a partial interaction of giana with TEAS, accompanied by severing ties With N giana and the formation of high-molecular compounds with a branched structure with differently oriented free ends of retaining a significant amount of water due to van der Waals forces.

Aggregates of molecules of insoluble aluminum hydroxide solubilizing inside the globules kationaktivnaya molecules of giana also significantly procrea structural adsorption rows.

The above processes of constructing multilayer extensive adsorption layers of the wall of the bubble help to enhance the stability of the three-phase foam systems to the action of heavy hydrocarbons radicals.

Known composition for the separation of flows of liquids containing TEAS mixed with cromakalim alum, to improve his ability in separating the channels of complex geo is P> Known composition for the temporary blockage of the productive layers containing polyacrylamide, mineralized water with methanol and aluminium hydroxide to increase the efficiency of the temporary blockage due to the recovery of permeability (and. C. N 1279294, CL E 21 In 33/138, 1985).

Known composition of the cement slurry containing the aluminum hydroxide in a mixture with sodium aluminate, with the aim of increasing strength while saving time setting. C. N 1728474, CL E 21 In 33/138, 1990).

Known composition of the invert emulsion drilling fluid, with the aim of increasing thermal stability up to 150aboutWith, as an internal phase containing 5-10% solution of aluminium hydroxide. C. N 709662, CL 09 To 7/02, 1977).

Known gamaty reagent for treatment of drilling fluids containing aluminium hydroxide, with the aim of improving the quality of the reagent by increasing its inhibitory effect on drilling muds (and. C. N 1046271, CL 09 To 7/02, 1982).

Use TEAS and aluminum hydroxide for the claimed purpose not identified in the available sources fame.

The claimed invention involves an inventive step, since it is not obvious from the prior art.

the e while stirring add TEAS in the amount of 200 g (2.0 wt.), then 1736 ml of a 16% aqueous solution of giana ( 1080 kg/m3), which is 300 g in terms of dry substance or 3.0 wt. and 20 g (0.2 wt.) aluminum hydroxide. The resulting mixture is brought to 100 wt. Prilepa 4,705 l of water (92,8 wt.).

For testing the resulting foam system is diluted with 2.5 liters of gas condensate. The foam ratio is 3.0, the stability 15640/cm3.

P R I m m e R 2. Conduct all operations as in example 1 but forming foam system is diluted with 2.5 liters of oil. The foam ratio of 2.7, stability 15638/cm3.

P R I m e R 3. Prepare the foam system of the following composition, g/wt. Bentonite 300/3,0 Gipan 400/4,0 (or 2315 ml or 2500 g of a 16% solution

giana, which contain

contained 2100 ml of water) TEAS 400/4,0 aluminum Hydroxide 50/0,5 Water 8850/88,5 (the system is brought up to 100% Prilepa 3,750 liters of water).

Conduct all operations as in example 1, the system is diluted with 2.5 liters of gas condensate. The foam ratio of 3.5, stability 16139/cm3.

P R I m e R 4. Conduct all operations as in example 3, but the resulting foam system is diluted with 2.5 liters of oil. The foam ratio of 2.0, sustainability 16143/cm3.

P R I m e R 5. Prepare the foam system of the following composition, g/wt. Bentonite 250/2,5 is rooked aluminum 30/0,3 Water 9070/90,7 (the system is brought up to 100% Prilepa 4,232 l of water)

Conduct all operations as in example 1, the system is diluted with 2.5 liters of gas condensate. The foam ratio of 3.5, stability 15892/cm3.

P R I m e R 6. Conduct all operations as in example 5, but the resulting foam system is diluted with 2.5 liters of oil. The foam ratio of 3.1, the stability 15884 m/cm3.

P R I m e R 7. Prepare the foam system of the following composition, g/wt% Bentonite 190/1,9 Gipan 250/2,5 (1446 or ml, or 1562 16%-aqueous solution of giana,

contains

1312 ml of water) TEAS 190/1,9 aluminum Hydroxide 10/0,1 Water 9360/93,6 (the system is brought up to 100% Prilepa 5,048 l of water)

Conduct all operations as in example 1, the system is diluted with 2.5 liters of gas condensate. The foam ratio of 2.6, resistance 10000/cm3.

P R I m e R 8. Conduct all operations as in example 7, but the resulting foam system is diluted with 2.5 liters of oil. The foam ratio of 2.2, stability 9854/cm3.

P R I m e R 9. Prepare the foam system of the following composition, g/wt% Bentonite 310/3,1 Gipan 410/4,1 (2372 or ml, or 2562 g of a 16% aqueous solution of giana,

contains

2242 ml of water) TEAS 410/4,1 aluminum Hydroxide 60/0,6 Water 8810/88,1 (the system is brought up to 100% Prilepa 3,568 l of water)

Conduct all operations as in example 1, the system Rasse operations so as in example 9, but the resulting foam system is diluted with 2.5 liters of oil. The foam ratio of 2.8, stability 16143/cm3.

The content in the foaming composition, wt. bentonite is less than 2.0, gipan below 3.0, TEAS less than 2.0, the aluminum hydroxide is less than 0.2 impractical because not contribute to the structural hardening of the adsorption layers of film air bubble foam systems.

The content in the foaming composition, wt. bentonite is more than 3.0, gipan 4.0, TEAS more than 4.0, the aluminum hydroxide of more than 0.5 is not economically feasible because it does not improve the physical and technological parameters of the foam systems.

Compared with the prototype application of the inventive foamable composition provides comprehensive repair works in the oil and gas condensate wells without complications.

FOAMABLE COMPOSITION FOR REPAIRS IN the WELL, including bentonite, water-soluble polymer of acrylic series, anionic surface-active agent (surfactant) and water, characterized in that, to increase the stability of the composition to the action of liquid hydrocarbons, it is additionally contains aluminum hydroxide as a water-soluble polymer gidrolizom the blowing ratio of components wt.

Bentonite 2,0 3,0

The gipan 3,0 4,0

Triethanolamine salt of alkyl sulphates 2,0 4,0

Aluminum hydroxide 0,2 0,5

Water The Rest

 

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