Filled viscoelastic gel-like composition

FIELD: production of filled gel-like composition with viscoelastic properties.

SUBSTANCE: claimed composition contains (vol.pts): 0.5-2.0 mass % sodium tetraborate aqueous solution 1-2; 1.0-8.0 mass % polyvinyl alcohol aqueous solution 1-5; 1.0-8.0 mass % carboxymethyl cellulose aqueous solution 1-5 or 1.0-8.0 mass % polyacrylamide aqueous solution 1-2; and filler 1-3. Composition has dynamic viscosity of 642-2467.87 mPa.s; elasticity modulus of 61.12-81.12 N/m2, and adhesion of 53.76-86.79 N/m2. As filler sand with particle size of 0.23-0.5 mm; lavsan or propylene fiber of 70-100 mum in diameter and filament length of 3-6 cm, or Teflon granule at most 1 mm in diameter. Composition of present invention is useful in production of petroleum industry, oil line purification, as anticorrosion, biocide and wear resistant coatings.

EFFECT: new viscoelastic composition of improved quality.

 

The invention relates to getting filled with a gel-like compositions having viscoelastic properties, and can be used in various fields of the oil and the oil industry as cement slurries, for water insulation layers, etc. and for cleaning oil from water and gas accumulations, for the application of anti-corrosion, biocidal and anti-wear coatings on the internal surface of the pipeline.

Famous U.S. patent No. 5284897 containing 70-93% water, 5-25% of partially hydrolyzed polyvinyl alcohol, 0.5 to 3% plasticizer for him, 0.05 to 1.5% thickener from the group of sodium carboxymethyl cellulose, sodium alginate and xanthan resins. The products obtained by this method have only adhesive ability.

Also known patent of Russia № 2139424 based on the cross-linking of polysaccharide solutions, which provides pre-mix 10-aqueous solution of sodium tetraborate with glycerol followed by the addition of alkali and homoclinic alum.

Most are similar in composition composition is a gel composition (U.S. patent No. 5501274), where as loose unbound material used sand, and as thermoplastic material is chosen from at least one of the group consisting of polyolefins, polyamides, polyimides, polyuret the new, the polysulfones, polycarbonates, polyesters (esters) and cellulose and their derivatives.

The disadvantage of this composition is insufficient viscosity and elasticity, the long cooking time of composition, and for a long time the formation of a gel.

Object of the present invention to provide a filled gel compositions with desired properties (viscosity, elasticity, adhesion and so on), the speed of obtaining rapid formation of the composition. The technical result is achieved in that the composition contains water of 1.0 to 8.0 wt.% the solution of polyvinyl alcohol (PVA), water of 1.0 to 8.0 wt.% the solution of carboxymethyl cellulose (CMC) or water of 1.0 to 8.0 wt.% polyacrylamide (PAA), as filler composition contains sand with a particle size of 0.3-0.5 mm, Mylar or polypropylene fiber with a diameter of 70-100 microns and a length of thread 3-6 cm, or Teflon granules having a particle diameter of not more than 1 mm, and optionally, the composition contains water of 0.5-2.0 wt.% a solution of sodium tetraborate (TBN) in the following ratio of components, OBC:

water 0.5-2.0 wt.% a solution of sodium tetraborate1-2
water is 1.0 to 8.0 wt.% polyvinyl alcohol : 1-5
water is 1.0 to 8.0 wt.% the solution of carboxymethyl cellulose or 1-5
water is 1.0 to 8.0 wt.% the solution of polyacrylamide1-2
the specified filler1-3

When you contact these solutions interact with the formation of gel-like compositions with the addition of various fillers. As the filler composition contains sand with a particle size of 0.3-0.5 mm, Mylar or polypropylene fiber with a fiber diameter of 70-100 microns and a length of thread 3-6 cm, Teflon pellets with a particle diameter of not more than 1 mm.

Table 1 shows the dynamic viscosity (MPa· (C) the source of polymer solutions.

Table 1.
The concentration of the solutions, %PVACMCPAA
14.829.22.1
26.6156.332.4
311.4661.853.3
437.21411.3117.1
551.92800.2635.6
6100.13012.9780.4
7106.23276.7978.1
8112.43496.11032.8

Examples of specific compositions of the gel compositions.

Example 1.

For preparation of gel compositions take (TBN:PVA=1:4) 5 hours 6% solution of PVA, of 1.25 hours 1% solution TBN and (PVA:CMC=1:1) 5 hours 2% CMC solution at room temperature. Stirring is continued for 10 minutes, the gel composition can withstand 2 hours after mixing, and then measure the dynamic viscosity on the device RHEOTEST-2". Viscosity equal 642 MPa·C. T=20°C. the young's Modulus 61,12 N/m2. Adhesion 53,76 N/m2.

Examples 2-46 shown in table 2 (according to the recipe of example 1).

Example 47.

For preparation of gel compositions take (TBN:PVA=1:4) 5 hours 6% solution of PVA, 1,25 including 0.5% solution TBN and (PVA:PAA=1:1) 5 hours 3% solution of PAA at room temperature, stirring is continued for 10 minutes, the gel composition can withstand 2 hours after mixing, and then measure the dynamic viscosity on the device RHEOTEST-2". Viscosity equal 829 MPa·C. T=20°C. the young's Modulus 96,34 N/m2. Adhesion 46,98 N/m2.

Example 48.

For the preparation of filled gel compositions take (TBN:PVA=1:4) 5 hours 5% solution of PVA, 1,25 including a 1.5% solution TBN, (PVA:CMC=1:1) 5 hours 2% solution of CMC and 1 teaspoon of sand, stirred for 10 minutes, filled with the gel composition can withstand two hours, after which from eraut dynamic viscosity. Viscosity equal 924,06 MPa·C. T=20°C. the young's Modulus 50,41 N/m2. Adhesion 51,54 N/m2.

Example 49.

For the preparation of filled gel compositions take (TBN:PVA=1:4) 5 hours 5% solution of PVA, 1,25 including 2% solution TBN, (PVA:PAA=1:1) 5 hours 2% solution of PAA and 3 hours of sand, stirring is continued for 10 minutes, filled with the gel composition stand two hours, then measure the dynamic viscosity. Viscosity equal 1226,78 MPa·C. T=20°C. the young's Modulus 56,19 N/m2. Adhesion 46,43 N/m2.

Example 50.

For the preparation of filled gel compositions take (TBN:PVA=1:4) 5 PM to 7% solution of PVA, 1,25 including a 1.5% solution TBN, (PVA:CMC=1:1) 5 hours 2% solution of CMC and 1 o'clock polypropylene fiber, stirring is continued for 10 minutes, filled with the gel composition stand two hours, then measure the dynamic viscosity. Viscosity equal 1819.62 MPa·C. T=20°C. the young's Modulus 69,28 N/m2. Adhesion 91,78 N/m2.

Example 51.

For the preparation of filled gel compositions take (TBN:PVA=1:4) 5 PM to 7% solution of PVA, 1,25 including a 2.0% solution TBN, (PVA:PAA=1:1) 5 hours 2% solution of PAA and 3 o'clock polypropylene fiber, stirring is continued for 10 minutes, filled with the gel composition stand two hours, then measure the dynamic viscosity. Viscosity equal 2345.12 MPa·C. T=20°C. the young's Modulus 61,12 N/m2. Adhesion to 86.7 N/m 2.

Example 52.

For the preparation of filled gel compositions take (TBN:PVA=1:4) 5 PM to 7% solution of PVA, 1,25 including a 1.5% solution TBN, (PVA:CMC=1:1) 5 hours 2% solution of CMC and 1 o'clock Mylar fibers, stirring is continued for 10 minutes, filled with the gel composition stand two hours, then measure the dynamic viscosity. Viscosity equal 2285.45 MPa·C. T=20°C. the young's Modulus 74,84 N/m2. Adhesion 78,04 N/m2.

Example 53.

For the preparation of filled gel compositions take (TBN:PVA=1:4) 5 PM to 7% PVA solution, 1.25 ml of 0.5% solution TBN, (PVA:PAA=1:1) 5 hours 2% solution of PAA and 3 o'clock Mylar fibers, stirring is continued for 10 minutes, filled with the gel composition stand two hours, then measure the dynamic viscosity. Viscosity equal 2467.87 MPa·C. T=20°C. the young's Modulus 81,12 N/m2. Adhesion 63,05 N/m2.

Example 54.

For preparation of gel compositions take (TBN:PVA=1:4) 5 hours 5% solution of PVA, 1,25 including 0.5% solution TBN and (PVA:CMC=1:1) 5 hours 5% solution of CMC. Stirring is continued for 10 minutes, the gel composition can withstand 2 hours after mixing, and then measure the dynamic viscosity on the device RHEOTEST-2". Viscosity equal 11680 MPa·C. T=0°

Example 54.

For preparation of gel compositions take (TBN:PVA=1:1) 5 hours 5% PVA solution, 1.25 ml of a 1.5% solution TBN and (PVA:CMC=1:1) 5 hours % solution of CMC. Stirring is continued for 10 minutes, the gel composition can withstand 2 hours after mixing, and then measure the dynamic viscosity on the device RHEOTEST-2". Viscosity equal 4216 MPa·C. T=30°C.

Example 55.

For preparation of gel compositions take (TBN:PVA=1:1) 5 hours 5% solution of PVA, of 1.25 hours 1% solution TBN and (PVA:CMC=1:1) 5 hours 5% solution of CMC. Stirring is continued for 10 minutes, the gel composition can withstand 2 hours after mixing, and then measure the dynamic viscosity on the device RHEOTEST-2". Viscosity equal 2775 MPa·C. T=60°C.

Example 56.

For preparation of gel compositions take (TBN:PVA=1:4) 5 hours 5% PVA solution, 1.25 ml of a 1.5% solution TBN and (PVA:CMC=1:1) 5 hours 5% solution of CMC. Stirring is continued for 10 minutes, the gel composition can withstand 2 hours after mixing, and then measure the dynamic viscosity on the device RHEOTEST-2". Viscosity equal 896 MPa·C. T=80°C.

Example 57.

For the preparation of filled gel compositions take (TBN:PVA=1:4) 5 hours 6% solution of PVA, 1,25 1% solution TBN and (PVA:CMC=1:1) 5 hours 2% solution of CMC, 1 h Teflon stirring is continued for 10 minutes, filled with the gel composition stand two hours, then measure the dynamic viscosity. Viscosity equal 1654,86 MPa·C. T=20°C. the young's Modulus 67,32 N/m2. Adhesion 24.7 N/m2.

the table 2 shows the values of dynamic viscosity η (MPa· (C) a gel composition depending on the concentration and ratios of polymers of the PVA and CMC at a constant additive component TBN:PVA=1:4, T=20°

6
Table 2
The ratio of PVA:CMC1%PVA+1%CMC2%PVA+2%CMC3%PVA+3%CMC4%PVA+4%CMC5%PVA+5%CMC
NNNNNNNNNN
1:1292.111118.720490291727384216
2:1398.612135.321587301906393550
3:14110.413147.422630312036403775
4:15111.814155.123769322284413812
5:1114.615162.124899332323424077
1:27129.116196.7253986344046433733
1:38141.5171380264112354135443661
1:49167.9182446274306364204453939
1:510181.2193910284928 occurs374472464970

Filled with viscoelastic gel composition of cement slurry containing aqueous solutions of the polymers and the filler, characterized in that the aqueous solutions of the polymer composition contains water of 1.0 to 8.0 wt.% the solution of polyvinyl alcohol, water of 1.0 to 8.0 wt.% the solution of carboxymethyl cellulose or water of 1.0 to 8.0 wt.% polyacrylamide, as filler composition contains sand with a particle size of 0.3-0.5 mm, Mylar or polypropylene fiber with a diameter of 70 to 100 MK and a thread length of 3-6 cm or Teflon pellets, having a particle diameter of not more than 1 mm, and optionally, the composition contains water of 0.5 - 2.0 wt.% a solution of sodium tetraborate, in the following ratio of components, about. including:

Water of 0.5 - 2.0 wt.% a solution of sodium tetraborate1-2
Water is 1.0 to 8.0 wt.% the solution of polyvinyl alcohol : 1-5
Water is 1.0 to 8.0 wt.% solution
carboxymethylcellulose or1-5
Water is 1.0 to 8.0 wt.% the solution of polyacrylamide1-2
The specified filler1-3



 

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