Clayless drilling mud

FIELD: oil and gas industry.

SUBSTANCE: invention refers to clayless drilling muds used for drilling processes, mainly during drilling of productive formations in wintertime at the temperature of 20°C below zero. Clayless drilling mud containing fluorine-containing copolymer of acrylamide and acrylic acid and water contains copolymer of the following general formula: of molecular weight 1.2·106 with fluorine content of 2-4%, at the following ingredient ratio, wt %: the above copolymer 0.1-0.15, and water is the rest.

EFFECT: stable operating parameters of the mud up to 100 days at the effect of decreased temperatures.

2 ex, 1 tbl

 

The invention relates to the field of drilling oil and gas wells, namely the non-clay drilling fluids used in drilling, mainly when opening the drilling of productive layers in winter at minus 20°C.

Known non-clay drilling mud (RF Patent No. 1556099, SC 7/02, publ. 1995), which includes an acrylic polymer, a salt of trivalent metal and water, characterized in that, to improve the ability to restore the technological properties after removal of drilling cuttings while increasing the speed of flocculation, it further comprises a cellulose ether in the following ratio of ingredients, wt.%:

Acrylic polymer0,001-0,035
Salt of trivalent metal0,003-0,030
The cellulose ether0,100-0,300
Waterrest

The disadvantages of the known non-clay drilling mud can be attributed to increased hydrodynamic pressure in the circulation, which reduces the efficiency of the washing process well and has a negative impact on maintaining the permeability zone of the formation.

The known is the drilling fluid (RF Patent No. 2243984, SC 7/02, publ. BI No. 1, 2005), containing acetylcellulose (TEV) or carboxylmethylcellulose (CMC), petroleum products - as an amendment, superfine powder filler with an associated gas (air, nitrogen) in the following ratio of ingredients:

Acetylcellulose (TEV), or
carboxylmethylcellulose (CMC)0,2÷0,3
Petroleum (oil commodity, diesel fuel, oil)5÷30
Surfactants (sulfinol, OP-10)0,02÷0,05
Superfine filler (modified bentonite, lignosulfanaty)0,9÷1
Air-gas mixture is air, nitrogen (volume)2÷20
Waterrest

The disadvantages of the known drilling mud can be attributed to the high cost, toxicity, fire hazard, the possibility of environmental pollution drilling waste, the problem of safe disposal.

Known drilling fluid (RF Patent No. 2362793, SC 8/08, publ. BI No. 21, 2009), containing floor is acrylamide, soda ash and water, and it additionally contains carboxylmethylcellulose - CMC and biopolymer "Suraksan" or "Soraksan-T" in the following ratio of ingredients, wt.%:

Polyacrylamide PAA0,15-0,3
Carboxylmethylcellulose - CMC0,3-0,5
Soda ash, Na2CO30,3-0,5
Biopolymer - "Suraksan" or "Soraksan-T"0,1-0,2
Waterrest

The disadvantages of this non-clay drilling mud is increased content of PAA, the inclusion in the formulation of expensive chemicals and the impossibility of its use at low ambient temperatures (-20°C).

Known non-clay drilling mud (US Patent No. 4780517, C08F 20/58, publ. 1988), containing from about 50 to 98 mole percent of acrylamide, about 1.9 to 49.9 mole percent alkali metal salt or ammonium salt of acrylic acid, and from about 0.1 to 5 mol percent copolymerizing ionic surfactants.

The disadvantages of this non-clay mud mo is however attributed to the high content of the polymer, the necessity of introducing ionic surfactants.

Known drilling fluid (RF Patent No. 2301244, SC 8/12, publ. BI No. 17, 2007), which is produced by mixing fresh water, brine or sea water and from about 0.3 pound to about 2.5 pounds active polymer compound, one or more anionic dispersed polymers. Anionic dispersed polymers comprise from about 2 to about 98 mole percent of one or more anionic monomers and from about 98 to about 2 mole percent of one or more nonionic monomers.

The disadvantage of this non-clay drilling mud can be attributed to the high content of the polymer, and the need for the introduction of saline or sea water.

Known drilling mud (CN Patent No. 1528797, C08F 220/56, publ. 2004), which has a high efficiency for hydrophobic Association, where the average molecular weight 15000,000-25000,000, has a low freezing point and resistance to salt deposits able to be applied in areas such as tertiary oil production.

The disadvantages of this mud can be attributed to the high content of the polymer is from 15 to 35%, and do not ensure long time operation at low temperatures to minus 20°C.

The problem to which direction is prohibited invention, is the development of non-clay composition of the drilling fluid, which is characterized by low polymer consumption, reduced cost of drilling mud, provides long-time stability of operating parameters in normal and difficult drilling conditions when exposed to low temperatures (temperatures up to minus 20°C).

The technical result is to obtain non-clay mud with stability operating parameters for up to 100 days when exposed to low temperatures to minus 20°C.

Technical result is achieved by non-clay mud containing fluorine-containing copolymer of acrylamide and acrylic acid and water, and wherein the use of the copolymer of the General formula:

molecular weight of 1.2·106with a fluorine content of 2-4%, with the following ratio of ingredients, wt.%:

The specified copolymer0,1-0,15
Waterrest

The data in table 1 show that the larger amount of ingredients is not economically feasible, since the increase in the content of the copolymer increases the viscosity of the solution and the freezing point does not change who I am.

Table 1
The results of the analysis
The concentration of the fluorine-containing copolymer in solution, wt.%Water, wt.%TimeFreezing point, °C
0,699,435minus 20
0,399,721minus 20
0,1599,8514minus 20
0,199,910minus 20

Example 1. To obtain a fluorine-containing copolymer is a copolymer of acrylamide and acrylic acid and artofterran globalfit, reagent ratio 1:4. In a reactor with a stirrer administered 1 g of the copolymer and add 8 ml of dimethylformamide (DMF), then add 4 g artofterran of globalfit. The first 10 minutes the reaction temperature minus 10°C. After the temperature was raised to 40°C and Provo is Yat reaction about 60 minutes. Upon completion of the reaction product is distilled DMF, filtered and dried residue.

The structural formula of the obtained copolymer:

Molecular weight: 1,2·106x=60%, y=40%. The fluorine content of 2%, with the following ratio of ingredients, wt.%:

The specified copolymer0,1
Water99,9

The melting point of 160°C. the Data of the IR-spectrum: 2916 cm-1, 2368 cm-1, 1750 cm-1, 1660 cm-1, 1417 cm-1, 1094 cm-1.

For preparation of the drilling fluid is water and the fluorine-containing copolymer. Order to obtain a homogeneous gel-like mass, time, solution preparation is 24 hours with constant stirring.

Example 2. To obtain a fluorine-containing copolymer is a copolymer of acrylamide and acrylic acid and artofterran globalfit, reagent ratio of 1:5. In a reactor with a stirrer administered 1 g of the copolymer and add 10 ml of dimethylformamide (DMF), then add 5 g artofterran of globalfit. The first 10 minutes the reaction temperature minus 10°C. After the temperature was raised to 40°C and carry out the reaction for about 60 minutes. Upon completion of the reaction product is distilled DMF, filtered and drying the residue.

The structural formula of the obtained copolymer:

Molecular weight: 1,2·106x=60%, y=40%. The fluorine content of 4%, with the following ratio of ingredients, wt.%:

The specified copolymer0,15
Water99,85

The melting point of 160°C. the Data of the IR-spectrum: 2916 cm-1, 2368 cm-1, 1750 cm-1, 1660 cm-1, 1417 cm-1, 1094 cm-1.

For preparation of the drilling fluid is water and the fluorine-containing copolymer. Order to obtain a homogeneous gel-like mass, time, solution preparation is 24 hours with constant stirring.

Ready for use in the drilling mud has the following rheological characteristics:

Density (ρ)1010 kg/m3
Viscosity (In)10
Freezing pointminus 20°C
PHrn

Tests of the inventive drilling fluid show that the n is universal and does not contain expensive reagents, such as CMC. The solution remains stable for up to 100 days, the viscosity does not change and is 10 seconds (example 1) and 14 sec (example 2) at normal and at low temperatures (-20°C).

The inventive drilling fluid possesses a number of useful qualities:

- has a high carrying capacity;

- saves a long time its stability up to 100 days.

Non-clay drilling mud containing fluorine-containing copolymer of acrylamide and acrylic acid and water, characterized in that the use of the copolymer of the General formula:

molecular weight of 1.2·106with a fluorine content of 2-4%, with the following ratio of ingredients, wt.%:

The specified copolymer0,1-0,15
WaterRest



 

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