Drilling fluid on synthetic basis

FIELD: oil and gas industry.

SUBSTANCE: drilling fluid on synthetic basis includes the following, wt %: water 20.3-47.3, polyatomic alcohol 20.3-47.3, biopolymer 0.23-0.34, sodium formate or sodium acetate 20.3-27.0, anionic emulsion ROSFLOK PV 3.4-6.8, bactericide 0.07-0.14, disperse chalk 1.7-5. Drilling fluid is prepared by introduction of biopolymer to water at constant mixing; polyatomic alcohol is added to the formed structured liquid in portions after dilution; after that, anionic emulsion is added; in order to control polarity of drilling fluid components and increase its heat resistance, there added is salt-electrolyte; in order to prevent biological decomposition of biopolymer, the latter is treated with bactericide; weighting-up of the fluid is performed with disperse chalk; drilling fluid is obtained at mixing with blade agitator with speed of 5000 rpm.

EFFECT: maintaining rheologic and filtration parameters of the fluid.

3 cl, 5 tbl

 

The invention relates to the oil and gas industry, namely technological liquids and compositions used in the construction of wells in salt deposits at elevated temperatures.

In the process of building wells in conditions characterized by the presence of salt formations, hydrogen sulfide and elevated temperatures, the use of drilling fluids without the directed chemical treatment on the regulation of physico-chemical properties leads to serious complications: the formation of cavities as a result of dissolution and erosion of salts, the increase in solution viscosity with the penetration of gas (hydrogen sulfide), thermal decomposition of the solution.

The issue of control of technological parameters of drilling fluids and prevent various complications devoted a large number of studies. However, existing approaches to the regulation of the properties of drilling fluids is not possible to fully control their filtration and rheological properties.

Known drilling mud [RF Patent №2231535, C1, 27.06.2004], have higher stability of rheological parameters in conditions of corrosive downhole environments and improved technical and economic performance drilling. The composition of the solution is clay, soda ash, Na2CO3the tail structure is Rosobrazovanie - carboxymethylcellulose CMC, salt-tolerant polymer, water and aluminium sulphate Al2(SO4)3as densifier use chalk. The disadvantage of this solution is the loss of its stability, stratification in liquid medium and dispersed phase. This process is due to the fact that interaction of inorganic coagulant is aluminum sulphate, and CMC during the reaction produces aluminum salt of CMC representing water-insoluble substance, well separated from the liquid phase. While exposure to high temperatures will increase the degradation of solution.

Known drilling mud [Pagegiai and other Drilling and grouting solutions, St. Petersburg, NGOs, Professional, 2007, s.226-227], which includes an aqueous solution of a polyhydric alcohol and a dispersion phase in the form of bentonite bentonite and dispersed chalk, as the regulator of the filtration parameters contains polyanionic cellulose RACES R, in the following ratio of ingredients, wt.%:

Bentonite bentonite5-6
Dispersed chalk37-40
Polyanionic cellulose RACES R0,1-0,2
Polyhydric the Peart 20-22
WaterRest

Known drilling mud has low values of filtrated and low rheological parameters. The disadvantages of this solution is the loss of stability of its structure and the sharp increase in filtering the solution when exposed to reservoir temperatures over 60°C.

The task of the invention to provide a drilling mud synthetic-based.

The technical result of the invention is directed to the preservation of rheological and filtration parameters of the solution at temperatures from 60 to 150°C. when using a polyhydric alcohol and an aqueous solution of salt of the electrolyte.

The technical result is achieved in that the drilling fluid to synthetic, comprising an aqueous solution of a polyhydric alcohol, a biopolymer, a dispersion phase in the form of dispersed chalk, contains anionic emulsion of ROSPLOCK PV, as salt-electrolyte using sodium formate or sodium acetate, and optionally a biocide in the following ratio of ingredients, wt.%:

Water20,3-47,3
Polyhydric alcohol20,3-47,3
Biopolymer0,23-0,34
The sodium formate or sodium acetate20,3-27,0
Anionic emulsion ROSPLOCK RO3,4-6,8
Bactericide0,07-0,14
Dispersed chalka 1.7-5

Distinctive features of the proposed drilling fluid are introduced into an aqueous solution of a polyhydric alcohol salt electrolytes and anionic emulsion ROSPLOCK PV efficiency-enhancing salt electrolytes. This composition has the ability to regulate the rheological and filtration performance under high reservoir temperatures. The decline in filtration alcohol solution is achieved by dissolving the electrolyte in the water.

The scarcity of water in alcohol solutions leads to the Association of alcohols, the interaction of which with the biopolymer causes a sharp drop in the filter.

This technical result is ensured due to the chemical properties of the components in the resulting drilling mud, and due to the sequence and conditions of its receipt.

Drilling mud is prepared by introduction into water with constant stirring biopol the measure. After dilution of the resulting structured liquid portion is introduced polyhydric alcohol is glycerol, ethylene-, dietilen - and triethylene glycol or polyglycol. Next enters the anionic emulsion ROSPLOCK RO.

To control the polarity of the components of the drilling fluid and increasing its heat resistance is injected salt electrolytes (sodium chloride, or bromide of sodium, or formate, or sodium acetate). To prevent biological degradation of biopolymer it is treated with a biocide "let", or "Renacido", or "Biocide".

Rimacid is a drug, which is a trimmer on the basis of ethanolamines and paraform. Used for protection against microbial infections of organic products, solutions and emulsions, to prevent slizeobrazovanie and corrosion caused by microorganisms. Rimacid prepare for THE 2484-004-22427740-02.

Biocide (for example, "BIOCIDE") is a disinfectant, prepared by THE 9392-038-42942526-2003. Biocide is a ready to use aqueous solution of aldehydes and Quaternary ammonium salts. It is well soluble in water, is not corrosion-active surfaces of the metal, which contains no chlorine and has a detergent action.

Alkyl derivatives of hexamine chloride produced Sterlitamak "Kaustik" p the TU-6-01-1012949-08-89 under trademark let-11. They are the product of the interaction of hexamethylenetetramine (urotropine) with chlorinated unsaturated hydrocarbons NW and C4. Physico-chemical parameters and standards requirements let answer THE 6-01-1012949-08-89 on let-11. The composition is an effective bactericide, but not used in winter, for example, in Western Siberia due to insufficient low temperature pour point: minus 15-20 degrees.

The weighting of the solution is dispersed chalk, in an amount to provide a predetermined density of the drilling fluid.

In tables 1, 2 shows the properties of drilling fluids, obtained by cooking 15%and 45%aqueous solutions of biopolymer (BP) with the content of glycerol in an amount of from 50% to 90%. All solutions were obtained by mixing paddle stirrer with speed 5000 / min.

In tables 3 and 4 shows the effect of various salts on the main indicators of drilling fluids, obtained by cooking 15%and 45%aqueous solutions of biopolymer with the content of glycerol in an amount of from 50% to 90%.

Table 5 provides information about the performance of the drilling fluid before and after incubation.

As can be seen from the tables, the increase in the concentration of alcohol in the solution leads to irreversible growth rate of filtration.

The analysis of the presented results shows that o is the proposed composition of the drilling fluid while maintaining sediment stability and the required viscosity and structural indicators than the known compositions of indicators such as filtering.

On the technological properties of the drilling fluid is significantly influenced by the ratio of the aqueous solution of alcohol and salt electrolytes (table 3, 4). So, with increase in the concentration of electrolytes are sodium chloride, calcium chloride, sodium acetate, sodium bromide, there is a decrease of the rate of filtration.

Increasing thermal stability of the drilling fluid is achieved by introducing into an aqueous solution of glycerol salts electrolytes (table 5). As a thermal stabilizer of the most effective salt electrolytes, such as sodium acetate and sodium formate.

Are given in tables 1-5 data allow us to establish the optimal formulation of the drilling fluid on the performance of its rheological and filtration parameters for the construction of oil and gas wells in saline sediments at elevated temperatures.

Table 1
The performance of the drilling fluid at various concentrations of glycerol with water and biopolymer (BP) in an amount of 0.15%.
CompositionDensity, kg/m3at room temperatureat 200°C Filtering, cm3/30 min
Plastic viscosity, MPa*sDynamic shear stress, PAPlastic viscosity, MPa*sDynamic shear stress, PA
49.9% of water + 0.15% of BP + 49.9% of glycerin1030208,14a 3.940
39,9% water + 0.15% of BP + 59,9% glycerol107023954,340
29.9% of water + 0.15% of BP + 69,9% glycerol1100601094,143
19,9% water + 0.15% of BP + 79,9% glycerol1150839,6113,285
9,9% water + 0.15% of BP + 89,9% glycerol1170 Through the roof133100

Table 2
The performance of the drilling fluid at various concentrations of glycerol and water biopolymer in the amount of 0.45%.
CompositionDensity, kg/m3at room temperatureat 200°CF, cm3/30 min
Plastic viscosity, MPa*sDynamic shear stress, PAPlastic viscosity, MPa*sDynamic shear stress, PA
49,7% water + 0,45% BP + 49,7% glycerol1130239,355,960
39,8% water + 0,45% BP + 59,7% glycerol1150309,365,6 60
29,8% water + 0,45% BP + 69,7% glycerol11809713,7133,261
19.8% of water + 0,45% BP + 79,7% glycerol12101019,8113,4100
9,8% water + 0,45% BP + 89,7% glycerol1230Through the roof163,4124

Table 5
The performance of the drilling fluid before and after incubation
IndicatorsUnitMeasuring range
at room temperatureat 200°C
The performance of the drilling fluid on the temperature control
Plastic viscosityMPa·s35-7020-50
Dynamic shear stressPA10-3010-30
Filteringcm3/30 min1-21-2
The performance of the drilling fluid after incubation at 120°C
Plastic viscosityMPa·s35-7020-50
Dynamic shear stressPA10-3010-30
Filteringcm3/30 min1-21-2

1. Drilling mud synthetic-based, comprising an aqueous solution of a polyhydric alcohol, a biopolymer, a dispersion phase in the form of dispersed chalk, characterized in that it additionally contains an anionic emulsion of ROSPLOCK PV, Sol-electrolyte - sodium formate or sodium acetate, bactericide when the trail the next ratio of ingredients, wt.%:

Water20,3-47,3
Polyhydric alcohol20,3-47,3
Biopolymer0,23-0,34
The sodium formate or sodium acetate20,3-27,0
Anionic emulsion ROSPLOCK RO3,4-6,8
Bactericide0,07-0,14
Dispersed chalk1.7 to 5,the

moreover, the drilling fluid is prepared by introduction into water with constant stirring biopolymer, after dissolving in the resulting structured liquid portions enter polyhydric alcohol, then enters the anionic emulsion, to control the polarity of the components of the drilling fluid and increasing its heat resistance is injected Sol-electrolyte, to prevent biological degradation of biopolymer it is treated with a biocide, the weighting solution produce dispersed chalk, drilling fluid obtained by mixing paddle stirrer with a speed of 5000 rpm/min

2. The solution according to claim 1, characterized in that as a polyhydric alcohol use glycerin.

Waster according to claim 1, characterized in that as a bactericide used reagents "let", or "Rimacid", or "Biocide".



 

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