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Thickener for water-based fracturing fluid and its synthesis method

A water-based fracturing and thickening agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of a large amount of residue, a large amount of water-insoluble matter, and great damage to the formation and cracks, and achieve the sand-carrying performance. Good, low residue content, the effect of reducing the residue content

Inactive Publication Date: 2015-10-14
NANTONG KEYI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the vegetable gum fracturing fluid system is still widely used in China. However, there are more water-insoluble substances in this system. Even if the first-grade hydroxypropyl guar gum is used, the water-insoluble substances are more than 8%.
At the same time, there are more residues when using vegetable glue fracturing fluid system, which will cause greater damage to formations and fractures
Moreover, its cross-linking condition is weakly alkaline, which is not suitable for acidic formations

Method used

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  • Thickener for water-based fracturing fluid and its synthesis method
  • Thickener for water-based fracturing fluid and its synthesis method
  • Thickener for water-based fracturing fluid and its synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In this embodiment, the weight percentage of each monomer and water is: AAM:DADMAC:AN:AA:AMPS:PVN:H2O=20:5:5:10:20:10:30.

[0045] Solution preparation: Add 300g of distilled water into a 2000ml beaker, add 200g of AAM monomer, 50g of DADMAC monomer, add 50g of AN monomer, add 100g of AA monomer, add 200g of AMPS monomer, add 100g of PVN monomer, stir to dissolve for 30 Minutes, slowly add neutralizer (sodium hydroxide) to pH 4.5 with stirring. The stirring solution was continued to ripen for 30 minutes.

[0046] Solution adjustment: according to the pH range after aging, use sodium hydroxide (pH alkaline regulator) or phosphoric acid (pH acidic regulator) to adjust the pH value to 4.5±0.5 again, and adjust the temperature to 10±1°C.

[0047] Polymerization of the solution: Blow nitrogen to deoxygenate for 15-20 minutes, add catalyst V651g / L, V500.1g / L, ammonium persulfate 0.08g / L, sodium formaldehyde sulfoxylate 0.08g / L sequentially under nitrogen protection, stop Bl...

Embodiment 2

[0050] The weight percent of each monomer in water: AAM:DADMAC:AN:AA:AMPS:PVN:H2O=25:5:5:5:10:5:45.

[0051] Solution preparation: Add 450g of distilled water to a 2000ml beaker, add 250g of AAM monomer, 50g of DADMAC monomer, add 50g of AN monomer, add 50g of AA monomer, add 100g of AMPS monomer, add 50g of PVN monomer, stir and dissolve for 30 Minutes, slowly add neutralizer (sodium hydroxide) to pH 4.5 with stirring. The stirring solution was continued to ripen for 30 minutes.

[0052] Solution adjustment: according to the pH range after aging, use sodium hydroxide (pH alkaline regulator) or phosphoric acid (pH acidic regulator) to adjust the pH value to 4.5±0.5 again, and adjust the temperature to 10±1°C.

[0053] Polymerization of the solution: Blow nitrogen to deoxygenate for 15-20 minutes, add catalyst V651g / L, V50 0.1g / L, ammonium persulfate 0.08g / L, sodium formaldehyde sulfoxylate 0.08g / L sequentially under nitrogen protection, stop Blow nitrogen and open the UV lamp ...

Embodiment 3

[0056] In this embodiment, the weight percentage of each monomer and water is: AAM:DADMAC:AN:AA:AMPS:PVN:H2O=20:5:5:10:20:10:30.

[0057] Solution preparation: Add 300g of distilled water into a 2000ml beaker, add 200g of AAM monomer, 50g of DADMAC monomer, add 50g of AN monomer, add 100g of AA monomer, add 200g of AMPS monomer, add 100g of PVN monomer, stir to dissolve for 30 Minutes, slowly add neutralizer (sodium hydroxide) to pH 4.5 with stirring. The stirring solution was continued to ripen for 30 minutes.

[0058] Solution adjustment: according to the pH range after aging, use sodium hydroxide (pH alkaline regulator) or phosphoric acid (pH acidic regulator) to adjust the pH value to 4.5±0.5 again, and adjust the temperature to 10±1°C.

[0059] Polymerization of the solution: Blow nitrogen to remove oxygen for 15-20 minutes, add catalyst V651.5g / L, V500.3g / L, ammonium persulfate 0.1g / L, sodium formaldehyde sulfoxylate 0.1g / L in sequence under nitrogen protection , stop ...

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Abstract

The invention discloses a thickening agent which is provided with a branched chain structure and used for water base fracture. The thickening agent is composed of six monomers in a copolymerization mode. The six monomers comprise N, N-dimethyl acrylic amide (AAM), dimethyl diallyl ammonium chloride (DADMAC), acrylonitrile (AN), methacrylic acid (AA), 2-acrylic amide-2-methyl propane sulfonate (AMPS) and N-VINYL-2-pyrrolidone (PVN). Further disclosed is a preparation method of the thickening agent with the branched chain structure. Compared with the prior art, the thickening agent has the advantages of being low in residue, temperature resistant, prone to dissolution, anti-shearing and good in sand carrying property. The hyperbranched molecule fracturing fluid thickening agent completely solves the problems that vegetable glue fracturing fluid is high in damage and friction, general polymer fracturing liquid is not resistant to shear and incomplete in gel breaking, and the like. The thickening agent is not like vegetable glue which contains a large amount of water insoluble matters, completely dissolved in a fracturing liquid stock solution, basic zero in the water insoluble matters and free of containing solid phase composition. The obtained fracturing liquid stock solution is glittering, translucent and bright. After gel is broken, compared with a vegetable glue fracturing liquid system, contend of residue is greatly reduced. The thickening agent has the advantages of being less in residue content, low in use viscosity, good in sand carrying property, low in cost, convenient to flow back and the like.

Description

technical field [0001] The present invention relates to a thickener for water-based fracturing fluids, in particular, the present invention relates to low-residue synthetic polymer thickening with a highly branched chain structure (hyperbranched) for water-based fracturing fluids Agent and the synthetic method of the thickener. Background technique [0002] Fracturing technology is a conventional stimulation technology. The type of fracturing fluid used in hydraulic fracturing and its performance are closely related to the creation of fractures with a certain size and conductivity, which is an important factor affecting the success or failure of fracturing. There are strict requirements on the properties of fracturing fluids, such as viscosification, rheology, fluid loss, friction loss, stability, and formation damage. Among them, the thickener (ie, thickener) that increases the viscosity of the fracturing fluid is the main component of the fracturing fluid. For a long tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C08F220/54C08F220/58C08F226/02C08F220/46C08F220/06C08F226/10C08F2/48
Inventor 郝春玲唐富刚
Owner NANTONG KEYI CHEM
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