The basis of the kill fluid and completions

 

The invention relates to gazoneftedobyvayuschie industry, in particular to the process fluids used in the completion and workover. The technical result is the development of a framework of kill fluids and completion, providing a higher density, low filtering, enabling them to preserve the natural permeability of the formation and savings in transport costs. The basis of the kill fluid and completion of wells containing formate of an alkali metal, further comprises a reagent stabilizer, and as a formate of an alkali metal includes sodium formate or potassium in the following ratio, wt.%: formate of an alkali metal 90-95; reagent stabilizer 5-10. As reagent stabilizer may contain compounds from the class of polysaccharides, such as carboxymethylcellulose, acetylcellulose, karboksimetilirovaniya starch, as well as compounds of the class of acrylic polymers, such as unifloc. The base fluid may further comprise bromide, sodium or calcium carbonate. 3 C.p. f-crystals, 3 tables.

The invention relates to gazoneftedobyvayuschie industry, in particular to technologica solutions for example sodium chloride or calcium, as liquids for completions and workover.

(Well killing fluids for repair of wells and their influence on reservoir properties of the formation. Ryabokon S. A. and other M: VNIIEM, Review. Inform. Ser. Petroleum engineering 1989, S. 42).

The disadvantage of these solutions is to reduce the permeability of the bottom-hole formation zone due to the impact on the cement and skeleton rock, leading to change of the particle size and the overlap of the filter channels. Under the influence of these liquids many rock-forming water-sensitive minerals hydratious and increases its volume. This results in higher total surface of the filtration channels and reducing the flow area, increasing the completion time and the yield of wells in mode.

It is also known the use of filtrate technical pentaerythritol (FTP) as well kill fluid, which is an aqueous solution of substances: sodium formate, pentaerythritol and its derivatives, minor amounts of sugars, bisulfates derived formaldehyde, sodium bisulfate.

(RF patent 2042798, E 21 In 43/22, 27.08.95 - prototype).

However, aqueous solution) can reach the maximum density of the reservoir is restored only at 72%. The viscosity) of the same order as aqueous solutions of other salts and brine, resulting in a large filtering and leads to significant acquisitions fluid and watercut.

###In addition, given the increasing share of transport costs in the cost estimate, transportation) as a liquid product uneconomical.

The objective of the invention is to develop a dry basis of kill fluids and completion, ensuring its high density, low filtering, enabling them to preserve the natural permeability of the formation, and the savings in transportation costs.

The invention consists in that the base fluid damping and completions containing formate of an alkali metal, further comprises a reagent stabilizer, and as a formate of an alkali metal it contains sodium formate or potassium formate at the following content, wt.%: Formate of an alkali metal - 90-95 Reagent-stabilizer - 5-10 as reagent stabilizer base fluid may contain compounds from the class of polysaccharides, such as carboxymethylcellulose (CMC), acetylcellulose (TEV), karboksimetilirovaniya starch (KMK).

As Rea is R unifloc.

The base fluid may further comprise bromide, sodium or calcium carbonate.

The proposed combination of components of fundamentals of fluid damping and completions in the claimed proportions results in a high effective viscosity of the prepared solution, promotes formation, which reduces the penetration of fluid into the reservoir and the productivity is restored to 90-95%. The claimed ratio of the various components provide a dry product suitable for storage and transportation, having a homogeneous composition and the possibility of controlling the properties of produced fluids depending on the geophysical conditions of the wells. The base is compatible with the basic reagents - regulators properties of process fluids in oil and gas production. Inclusion in the basis of bromide of sodium or calcium carbonate provides the possibility of obtaining a heavier fluid.

The basis of the kill fluid and completions, unlike FTP, combines the functions of the regulator and fluid density reducer filter. When cooking liquids using the basics of the following options: use pre-cooked plant based is crucial in the composition of the base of a dry alkali metal formate achieve the density of the liquid directly on the well using standard equipment due to the simplicity of the technology.

For getting the basics of kill fluids and completion of dry sodium formate or potassium mixed with reagent-stabilizer in mechanical stirrer. The resulting product is a crystalline powder white or grey color, no impurities visible to the naked eye, soluble in water. the pH of the aqueous solution is in the range of 6-7.

Examples of embodiment of the invention.

Example 1 (table. 1, structure 1). To prepare 1 liter of fluid take 584,9 g (95 wt.%) formate sodium and mix from 30.8 g (5 wt.%) carboxymethylcellulose (CMC). The resulting basis make 694,3 ml of water. The mixture is stirred with water using a laboratory stirrer until complete dissolution of the components. Then measure all the parameters of the obtained liquid: density using a pycnometer, viscosity - UBD-1, plastic viscosity and dynamic shear stress - VSN-3, the filtering VM-6. Get the liquid with a density of 1.31 g/cm3and with the rate of filtration 10 cm3in 30 minutes.

Example 2 (table. 1, part 5). To prepare 1 l of liquid take 562,1 g (92 wt.%) formate sodium and mix it with 48,9 grams (8 wt.%) acetylcellulose (TEV). Ready Foundation make 689,0 ml of water. Produces the remaining 6). To prepare 1 l of liquid take 545,7 g (90 wt.%) formate sodium and mix it with 60,6 g (10 wt.%) carboxymethylamino starch (KMK). Ready Foundation make 683,7 ml of water. Get the liquid with a density of 1.29 g/ cm3and with the rate of filtration 12 cm3in 30 minutes.

Example 4 (table. 1, part 9). To prepare 1 l of liquid take 771,4 g (95 wt. % ) potassium formate, mix it with 40.6 g (5 wt.%) uniflora. Ready Foundation make 588,0 ml of water. Get the liquid with a density of 1.4 g/cm3with the rate of filtration 5 cm3in 30 minutes.

Indicators of fluid obtained from other compounds of the basics, which is prepared analogously to the above examples, are given in table. 1.

Example 5. To prepare 1 l of weighted fluid density of 1.46 g/cm3take the base, prepared according to example 1, making it 255,5 g sodium bromide based its content in the finished liquid to 17.5 wt.%, mix all the components and the finished base is dissolved with stirring in 588,8 ml of water. The parameters derived liquids are presented in table. 2.

Example 6. To prepare 1 l of weighted fluid density 1.6 g/cm3take the base prepared according to example 4, making it 432,0 g of calcium carbonate based drop in 356,0 ml of water. The parameters derived liquids are presented in table. 2.

At serial installation wipk-1M on identical samples studied the effect of process fluid on the permeability of the reservoir compared to FTP. Artificial core was placed in kindergaten, created GidroOGK 12 MPa; under the action of differential pressure 10 MPa investigated liquid is filtered through the core. The number of the separated filtrate was measured after a certain period of time(1, 4, 5, 16, 25 C). On the basis of the results expected recovery coefficient of permeability, radius of penetration of the filtrate and the coefficient of performance OP - quantitative index indicating the ratio of actual productivity to potential. The results were processed using computer programs. The results of the tests are presented in table. 3.

As follows from the data presented in table. 1-3, the fluid prepared with the use of the proposed framework, reach a density greater than the density), while possessing high stability technological properties, easily controllable, structural and rheological parameters and water yield. They provide less penetration of the filtrate is ultimately the best indicator OP = 0,94-0,98 for low-permeability (MD 50) collectors, and for collectors permeability of 200 MD.

The proposed framework is convenient for storage, transportation and use, because it consists of solid, dry and non-toxic substances.

Claims

1. The basis of the kill fluid and completion of wells containing formate of an alkali metal, characterized in that it further comprises a reagent stabilizer, and as a formate of an alkali metal includes sodium formate or potassium formate in the following ratio, wt.%: Formate of an alkali metal - 90-95 Reagent-stabilizer - 5-10 2. The basis of fluid under item 1, characterized in that the reagent-stabilizer it contains compounds from the class of polysaccharides, such as carboxymethylcellulose, acetylcellulose, karboksimetilirovaniya starch.

3. The basis of fluid under item 1, characterized in that the reagent-stabilizer it contains compounds from the class of acrylic polymers, such as unifloc.

4. The basis of fluid under item 1, characterized in that it further comprises sodium bromide or calcium carbonate.

 

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