RussianPatents.com

Well killing polysaccharide gel composition and method for producing the same. RU patent 2246609.

IPC classes for russian patent Well killing polysaccharide gel composition and method for producing the same. RU patent 2246609. (RU 2246609):

E21B43/12 - Methods or apparatus for controlling the flow of the obtained fluid to or in wells (E21B0043250000 takes precedence;valve arrangements E21B0034000000)

Another patents in same IPC classes:

Compound for blocking and shutting wells / 2245996
Compound includes water and inhibiting salt, as inhibiting salt contains processed electrolyte - side product during production of magnesium via electrolysis from carnallite, and additionally as reducer of filtering and thickener - carbooximethylcellulose polymer, and as colmatation agent - magnesium oxide with following relation of components in percents of mass: processed electrolyte - side product of magnesium production via electrolysis from carnallite 10.0-15.0, carbooximethylcellulose 2.5-3.0; magnesium oxide 1.0-2.0, water 80.0-86.5.

Foam-forming compound for shutting wells / 2245441
Foam-forming compound for shutting wells contains hydrocarbon liquid, mixture of surfactants, one of components thereof is water solution of lignosulphonate reagent of 25% concentration, herbal filling agent and 20% water solution of calcium chloride, as lignosulphonate agent reagent it contains powder-like technical lignosulphonate, and as other component of surfactant mixture - hexamethylentetramine, and as herbal filling agent - peat or grass flour with following ratio of components in percents of mass: hydrocarbon liquid 12-14, said water solution of technical powder-like lignosulphonate 17-21, hexamethylentetramine 0.17-0.63, peat or grass flour 3-6, said calcium chloride solution - the rest, while relation of mass portions between said water solution of technical powder-like lignosulphonate and hexamethylentetramine is 1: 0.01-0.03 respectively, as grass flour it contains pulverized herbal waste of grain bread production or similar substance.

Method of examining wells / 2244105
Invention can be used in case of gas-lift operation of wells equipped by free piston-type installations. Invention envisages stopping well, connecting tube space and annular space in wellhead, recording bottom zone and wellhead pressures in tube and annular spaces, and computing well operation parameters using inflow curve plotted according to differences of bottom zone and wellhead pressures. Volume of produced fluid is found from potential output of formation and from condition of output of free piston. When comparing these volumes, parameters of well are computed in the base of minimum volume value.

Well killing polysaccharide gel composition and method for producing the same / 2246609
Claimed polysaccharide gel contains sweet or mineralized water, polysaccharide gelling agent, boron cross-linking agent, diethanolamine, quaternary ammonium compounds, and mixture of non-ionic and anionic surfactant (complex surfactant). Mixture of water soluble oxyethilated alkylphenols and their sulphoethoxylates in form of sodium salts or salts with triethanolamine is used as complex surfactant in amount of 0.1-0.5 kg on 1000 l of water being the gel base. Polysaccharide gel is obtained by dissolution and hydration of polysaccharide gelling agent in sweet or mineralized water (preferably monovalent ion solution) followed by treatment of obtained polysaccharide solution with aqueous solution including boron cross-linking agent, diethanolamine, quaternary ammonium compounds, and complex surfactant.

Method for extraction of hydrocarbon deposit with sole water and extraction of hydrocarbon by sucker-rod compressor pump with separated intake of hydrocarbon and water / 2247228
Method includes mounting compressor pump in such a way, that input aperture of tail piece was positioned below bed sole. Prior to that water cone in face-adjacent zone is destroyed by draining water through tail piece, connected to lower suck-in valve of compressor pump cylinder, and along behind-pipe space through side suck-in valve of compressor pump cylinder. In case of increase of hydrocarbon contained in drained liquid beginning of water cone destruction is assumed. Draining is continued until destruction of emulsion in water cone, formed in non-homogenous porous environment of bed at limits of hydrocarbon-water and water-hydrocarbon, separation of water and hydrocarbon streams and bringing current water-hydrocarbon contact to initial position. Then during extraction water is drained through tail piece, and hydrocarbon - along behind-pipe space.

Well stopping method / 2250360
Method includes preparation of technological liquid - water solution of sylvinite ore mixture with chlorine calcium by solving a mixture of components in hot fresh technical water, drained from oil and water preparation plants or bed water. During solution of sylvinite ore mixture with chlorine calcium in bed water the latter is drained from the well at temperature 60-90°C. Technological liquid is produced with solution density 1.23-1.37 t/m³. Then prepared technological liquid is fed into well shaft a bit lower, oppositely to zone and above ceiling of productive bed with forming of hydraulic column above the latter. Then well shaft to the mouth is filled with water. Value of technological liquid hydraulic column of high density on basis of said mixture, fed into well shaft above ceiling of productive column of technological liquid is taken in amount, necessary and enough from well stopping conditions.

Well killing composition / 2254454
Water-based composition that can be used for killing of well during pullout of hole and well remedial work as well as for temporary abandonment of well contains, wt %: carboxymethylcellulose3.5-4.5, sodium hydroxide1.5-2.0, copper sulfate 0.3-0.4, and methanol 4.0-16.0.

Method for shutting a well / 2255209
Method includes serial pumping into well of buffer, blocking and pressing liquid, blocking liquid contains hydrocarbon base, acyclic acid, caustic soda and mineral filler with following relation of components in percents of mass: hydrocarbon base 41-72, acyclic acid 6.1-14.4, caustic soda 4.9-13.0, mineral filler the rest. Hydrocarbon base of blocking liquid is oil or oil processing products. As mineral filler blocking liquid has calcium carbonate with diameter of particles no less than 2 micrometers.

Method for operating gas-lifting oil well, gas-lifting oil well and method for controlling flow of multi-phase flowing substance in gas-lift oil well / 2256067
At least one acoustic dynamic is mounted immediately on product pipe in oil well and acoustic characteristic of flowing environment flow is determined in product pipe. It is sent into surface controller, using product pipe. Using surface controller flowing substance flowing mode is determined, on basis of which working parameters of oil well are adjusted. Working parameters of oil well can be adjusted to detect Taylor mode of flow. For adjustment of working parameters throttle is used and/or controlled valve of oil well, controlling amount of gas, forces into product pipe. For determining mode of flow of flowing environment artificial neuron net can be used. It is possible is provide energy for acoustic sensor through product pipe. It is possible to determine additional physical characteristics of flowing substance, for example pressure and temperature.

System for controlling connections and feeding of electric current, oil well for extracting oil products (variants) and method for extracting oil product from oil well / 2256074
System has first induction throttle, second induction throttle and controlled switch. Second induction throttle is positioned near second branch of pipeline structure. Controlled switch has two outputs. First switch output is electrically connected to pipeline structure on the side of induction throttles connection, where first and second branches of pipeline structure intersect. Second output of switch is electrically connected to pipeline structure on other side of at least one induction throttle. Pipeline structure can be positioned inside oil well, and can have casing string and operation tubing column. Also described is method for extracting oil products from oil well using said system.

FIELD: oil and gas producing industry, in particular composition for killing of well.

SUBSTANCE: claimed polysaccharide gel contains sweet or mineralized water, polysaccharide gelling agent, boron cross-linking agent, diethanolamine, quaternary ammonium compounds, and mixture of non-ionic and anionic surfactant (complex surfactant). Mixture of water soluble oxyethilated alkylphenols and their sulphoethoxylates in form of sodium salts or salts with triethanolamine is used as complex surfactant in amount of 0.1-0.5 kg on 1000 l of water being the gel base. Polysaccharide gel is obtained by dissolution and hydration of polysaccharide gelling agent in sweet or mineralized water (preferably monovalent ion solution) followed by treatment of obtained polysaccharide solution with aqueous solution including boron cross-linking agent, diethanolamine, quaternary ammonium compounds, and complex surfactant.

EFFECT: well killing composition of improved quality.

2 cl, 6 ex, 1 tbl

The present invention relates to the oil and gas industry, in particular, compositions for plugging and temporary abandonment of wells and methods for their preparation and use, and compositions of drilling fluids, fluids for perforating and gravel packing, fluids for hydraulic fracturing, and can also be used to limit water production in oil and gas wells.

Known composition of the polysaccharide gel hydraulic fracturing, containing fresh or salt water, polysaccharide thickener, boron crosslinker, diethanolamine and Quaternary ammonium compounds, which are used katamin AB, representing a 50%aqueous solution of alkyldimethylbenzylammonium with alkyl radical C 16-20 or repellent Neprinol GF, representing a 50%aqueous solution of Quaternary ammonium salts of the products of quarterisation tertiary alkyldimethylammonium with alkyl radical With 12 to 18 and benzylchloride, in the amount of 0.05-1.0 kg per 1000 litres of water - the basis of the gel. For the destruction of the gel after the process of hydraulic fracturing composition contains an oxidizing component taken from the group consisting of ammonium persulfate, persulfate, percarbonate and perborate alkali metals [1]. A similar composition without the destructor can be used as a kill fluid.

The shortcoming of the above composition is that it cannot be successfully applied as well kill fluid, because of the high adsorption on the rock cationic surfactant increases the interfacial tension between hydrocarbon filtrate fluid entering the reservoir, which may reduce the flow of oil after the killing of the well.

The invention is directed to the creation of the composition of the liquid damping on the basis of a polysaccharide, a filtrate which has a low interfacial tension at the border with hydrocarbon that will allow you more easily to master well after holding repairs.

The result is achieved by the additional introduction of the polysaccharide gel of a mixture of nonionic and anionic surfactant - surfactant Complex of Netanya VVD, which is a mixture of water-soluble ethoxylated ALKYLPHENOLS and their sulfosalicylate in the form of sodium salts, or salts with triethanolamine.

Features of the invention "the Composition of the polysaccharide gel for killing wells and method of cooking" is:

1. Fresh or salt water.

2. Polysaccharide thickener.

3. Boron crosslinker.

4. Diethanolamin.

5. Quaternary ammonium compounds.

6. The additive.

7. As additives used a mixture of nonionic and anionic surfactant - surfactant Complex Neprinol VVD.

8. Additive per 1000 l of the composition is 0.1-0.5 kg

9. The method of preparation of the gel.

Signs 1-5 are common with the prototype, and signs 6, 7, 8, 9 - salient features of the invention.

THE INVENTION

Proposed composition of the polysaccharide gel for killing wells containing fresh or salt water, polysaccharide thickener, boron crosslinker, diethanolamine, Quaternary ammonium compounds, characterized in that it additionally contains a mixture of nonionic and anionic surfactant - surfactant Complex Neprinol VVD, which is a mixture of water-soluble ethoxylated ALKYLPHENOLS and their sulfosalicylate in the form of sodium salts, or salts with triethanolamine in an amount of 0.1-0.5 kg per 1000 litres of water - the basis of the gel;

and method of preparation of polysaccharide gel, including the dissolution and hydration of the polysaccharide thickener in fresh or saline water, represented mainly by the solutions of monovalent cations, followed by processing the resulting solution of the polysaccharide aqueous solution comprising boric stapler, diethanolamine, Quaternary ammonium compound and a mixture of nonionic and anionic surfactant - surfactant Complex Neprinol VVD.

For research were used:

1. The water is fresh.

2. Water mineralization:

a solution of potassium chloride density 1,150 g/cm 3 ;

- water reservoir in Western Siberia, potassium chloride type, density 1,012 g/cm 3 with cations CA ++ and Mg ++ 1000 mg/L.

3. Polysaccharide:

- hydroxypropanoic brand Yaguar HP8FF.

4. Boron crosslinker solution of sodium tetraborate desativado, GOST 4199-76.

5. Diethanolamin (h), THE 6-09-2652-91.

6. Repellent neprinol GF, THE 2484-035-17197708-97.

7. A mixture of nonionic and anionic surfactants:

- Complex surfactants Neprinol VVD, THE 2483-015-17197708-97, representing a mixture of water-soluble ethoxylated ALKYLPHENOLS and their sulfosalicylate in the form of sodium salts, or salts with triethanolamine.

Examples of the preparation of the gels.

Example 1.

1000 ml total quantity of fresh water - the basis of gel - cast 40 ml for preparation of a solution of boric staple, diethanolamine, repellent of Netanya GF and a mixture of nonionic and anionic surfactant - surfactant Complex of Netanya VVD. In 960 ml of fresh water under stirring by a paddle stirrer was administered 4 g hydroxypropylamino, after which the resulting solution was stirred for 30 min until complete hydration of the polysaccharide, and then stopping stirring, introduced an aqueous solution containing 40 ml of fresh water, 0.4 g of boric staple, 0.2 g of diethanolamine, 0.5 g of water-repellent of Netanya GF and 0.1 g of a mixture of nonionic and anionic surfactant - surfactant Complex of Netanya VVD, after which the resulting gel was stirred for another 1-2 minutes until fully blended.

Example 2.

1000 ml total solution of potassium chloride - fundamentals of gel density 1,150 g/cm 3 were cast 40 ml for preparation of a solution of boric staple, diethanolamine, repellent of Netanya GF and a mixture of nonionic and anionic surfactant - surfactant Complex of Netanya VVD. In 960 ml of a solution of potassium chloride with stirring at a blade stirrer was administered 4 g hydroxypropylamino, after which the resulting solution was stirred for 30 min until complete hydration of the polysaccharide, and then stopping stirring, introduced an aqueous solution containing 40 ml of a solution of potassium chloride density 1,150 g/cm 3 , 0.4 g of boric staple, 0.2 g of diethanolamine, 0.5 g of water-repellent of Netanya GF and 0.25 g of a mixture of nonionic and anionic surfactant - surfactant Complex of Netanya VVD, after which the resulting gel was stirred for another 1-2 minutes until fully blended.

Example 3.

1000 ml total quantity of produced water - the basis of gel density 1,012 g/cm 3 with the content of ions CA ++ and Mg ++ 1000 mg/l were cast 40 ml for preparation of a solution of boric staple, diethanolamine, repellent of Netanya GF and a mixture of nonionic and anionic surfactant - surfactant Complex of Netanya VVD. In 960 ml of produced water under stirring at a blade stirrer was administered 4 g hydroxypropylamino, after which the resulting solution was stirred for 30 min until complete hydration of the polysaccharide, and then stopping stirring, introduced an aqueous solution containing 40 ml of produced water, 0.4 g of boric staple, 0.2 g of diethanolamine, 0.5 g of water-repellent of Netanya GF and 0.5 g of a mixture of nonionic and anionic surfactant - surfactant Complex of Netanya VVD, after which the resulting gel was stirred for another 1-2 minutes until fully blended.

Example 4 (prototype).

1000 ml total quantity of fresh water - the basis of gel - cast 40 ml for preparation of a solution of boric staple, diethanolamine and water-repellent of Netanya GF. In 960 ml of fresh water under stirring by a paddle stirrer was administered 4 g hydroxypropylamino, after which the resulting solution was stirred for 30 min until complete hydration of the polysaccharide, and then stopping stirring, introduced an aqueous solution containing 40 ml of fresh water, 0.4 g of boric staple, 0.2 g of diethanolamine and 0.5 g of water-repellent of Netanya GF, after which the resulting gel was stirred for another 1-2 minutes until fully blended.

Example 5 (prototype).

1000 ml total solution of potassium chloride - fundamentals of gel density 1,150 g/cm 3 were cast 40 ml for preparation of a solution of boric staple, diethanolamine and water-repellent of Netanya GF. In 960 ml of a solution of potassium chloride density 1,150 g/cm 3 with stirring on a paddle stirrer was administered 4 g hydroxypropylamino, after which the resulting solution was stirred for 30 min until complete hydration of the polysaccharide, and then stopping stirring, introduced an aqueous solution containing 40 ml of a solution of potassium chloride density 1,150 g/cm 3 , 0.4 g of boric staple, 0.2 g of diethanolamine and 0.5 g of water-repellent of Netanya GF, after which the resulting gel was stirred for another 1-2 minutes until fully blended.

Example 6 (prototype).

1000 ml total quantity of produced water - the basis of gel density 1,012 g/cm 3 with the content of ions CA ++ and Mg ++ 1000 mg/l were cast 40 ml for preparation of a solution of boric staple, diethanolamine and water-repellent of Netanya GF. In 960 ml of produced water under stirring at a blade stirrer was administered 4 g hydroxypropylamino, after which the resulting solution was stirred for 30 min until complete hydration of the polysaccharide, and then stopping stirring, introduced an aqueous solution containing 40 ml of produced water, 0.4 g of boric staple, 0.2 g of diethanolamine and 0.5 g of water-repellent of Netanya GF, after which the resulting gel was stirred for another 1-2 minutes until fully blended.

The obtained alloys were investigated as follows:

the filter press high pressure and temperature (FANN) studied the filtering of the obtained gels at a temperature of 80°C and a pressure of 0.7 MPa. The resulting filtrate using part of the stalagmometer was determined interfacial tension on the border with kerosene. To the filtrate was added 3 wt.% bentonite clay, and the resulting mixture was left for a day to adsorption of the surfactant, after which the clay was filtered through filter paper and the resulting filtrate was again investigated by stalagmometer.

Table 1 presents the results of the research.

Table 1 number of Liquid-based gel Number of Netanya VVD, kg per 1000 l water framework gel Volume of filtrate after 30 min, ml Interfacial tension of the filtrate to handle clay, mn/m Interfacial tension of the filtrate after treatment with clay, mn/m 1. The water is fresh 0,1 30,3 3,9 4,5 2 solution of potassium chloride density 1,150 g/cm 3 0,25 15,8 2,8 3,1 3. produced water density 1,012 g/cm 3 0,50 21,7 2,8 2,9 4. The water is fresh - 31,0 4,8 8,3 5. a solution of potassium chloride density 1,150 g/cm 3 to 15.6 5,1 9,0 6. produced water density 1,012 g/cm 3 - 22,0 4,9 8,5

From the table it follows that the additive composition is 0.1-0.5 kg per 1000 l water framework gel mixture of nonionic and anionic surfactant - surfactant Complex of Netanya VVD - significantly reduces the interfacial tension of the filtrate, while it also remains low and after addition to the filtrate clay, while in the compositions without the mixture of nonionic and anionic surfactant - surfactant Complex of Netanya VVD - with the addition of clay interfacial tension increases significantly.

For the preparation of polysaccharide gel for killing wells in the field is as follows oilfield equipment:

cementing unit CA-320 (1 piece)*;

- PUF;

- tank for 6-8 m 3 (1 piece)*;

ejector for introducing reagents;

- additional capacity.

*) Cementing unit and the truck can replace kislotnik (unit SYN-32).

In the truck is loaded fresh water, or a solution of potassium chloride or sodium, or produced water density. Part cooked fresh water or solution is selected in the additional capacity is smaller, the rate of 40 l per 1000 l of a solution - fundamentals of gel.

Fresh or salt water in the tank using the foam is heated to 18-30°C, and then into it under stirring using CA-320 through the ejector evenly, for one cycle of mixing, enter the estimated amount of the polysaccharide thickener, after which the resulting solution was stirred (done 2-3 cycles of mixing).

In additional capacity in pre-selected fresh or saline water successively dissolved boron crosslinker, diethanolamine, Quaternary ammonium compound and a mixture of nonionic and anionic surfactant - surfactant Complex Neprinol VVD in an amount of 0.1-0.5 kg per 1000 litres of water - the basis of the gel.

Cooked in extra capacity of the reagent solution using CA-320 and ejector uniformly for 1 cycle is mixed with a solution of a polysaccharide thickener prepared in the truck, resulting in a bound polysaccharide water-based gel low viscosity.

It is possible to apply several options jamming:

with complete replacement of the well fluid on the polysaccharide kill fluid;

- replacement of the well fluid on the polysaccharide kill fluid 200-300 meters above the perforated interval, and the above - layered or salt water.

With a full fluid change on polysaccharide kill fluid technology killing technology is similar to the use of water systems and differs in that it does not occur acquisitions reservoir. Therefore, the flow rate of the polysaccharide kill fluid does not exceed the volume of the wellbore.

When combined replacement of downhole fluid flow polysaccharide kill fluid in 3-4 times less than with a full replacement. The amount of polysaccharide kill fluid is determined by calculation based on the volume of the sump and the abandonment of glass overlying the perforation interval in 100-200 meters

A necessary condition of this technology is the density of the polysaccharide kill fluid must exceed 20-50 kg/m 3 density of the base fluid damping (saline).

A new set of declared essential features allows you to get a new technical result, namely to create an effective composition of the liquid for killing wells and technological method of its preparation.

Source of information

1. RF patent №2173772, E 21 In 43/26 - prototype.

1. The composition of the polysaccharide gel for killing wells containing fresh or salt water, polysaccharide thickener, boron crosslinker, diethanolamine, Quaternary ammonium compounds, characterized in that it additionally contains a mixture of nonionic and anionic surfactant - surfactant complex Neprinol VVD, which is a mixture of water-soluble ethoxylated ALKYLPHENOLS and their sulfosalicylate in the form of sodium salts, or salts with triethanolamine in an amount of 0.1-0.5 kg per 1000 litres of water - the basis of the gel.

2. The method of preparation of the composition of the polysaccharide gel according to claim 1, including the dissolution and hydration of the polysaccharide thickener in fresh or saline water, represented mainly by the solutions of monovalent cations, followed by processing the resulting solution of the polysaccharide aqueous solution comprising boric stapler, diethanolamine, Quaternary ammonium compound and a mixture of nonionic and anionic surfactant - surfactant complex Neprinol VVD.