Graft type fracturing fluid and preparation process thereof

A fracturing fluid, branch type technology, applied in the direction of chemical instruments and methods, drilling compositions, etc.

Inactive Publication Date: 2007-07-18
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report about the patent of this type of grafted gelling agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In the reaction vessel, the carboxymethyl cellulose and acrylamide monomers are made into an aqueous solution according to carboxymethyl cellulose: acrylamide: water (mass ratio) = 100: 10-50: 750, and filled with N 2 Remove the oxygen in the system, add 0.5wt% (relative to the monomer mass) initiator (1wt% ammonium persulfate solution), react at 50°C for 5h; the reaction product is diluted into an aqueous solution with a mass concentration of 0.4-1.0wt%, A graft type fracturing fluid base fluid can be obtained; the apparent viscosity of the base fluid is measured by RV-20 rotary viscometer, 170S at 45℃ -1 Finished at shear rate. The results are listed in Table 1:

[0018] Table 1

[0019] Carboxymethyl cellulose: acrylamide (mass ratio)

Embodiment 2

[0021] In the reaction vessel, the carboxymethyl starch and acrylamide monomers are made into an aqueous solution according to carboxymethyl starch: acrylamide: water (mass ratio) = 100: 30-60: 200; filling with N 2 Remove the oxygen in the system, add 1.0wt% (relative to the monomer mass) initiator (1wt% ammonium persulfate solution), react at 40°C for 6h; the reaction product is diluted into an aqueous solution with a mass concentration of 0.4-1.0wt%, A graft type fracturing fluid base fluid can be obtained; the apparent viscosity of the base fluid is measured by RV-20 rotary viscometer, 170S at 45℃ -1 Finished at shear rate. The results are listed in Table 2:

[0022] Table 2

[0023] Carboxymethyl starch: acrylamide (mass ratio)

Embodiment 3

[0025] In the reaction vessel, the carboxymethyl cellulose and acrylamide monomers are made into an aqueous solution according to carboxymethyl cellulose: acrylamide: water (mass ratio) = 100: 30: 1000, and filled with N 2 Remove oxygen in the system, add 0.02wt% (relative to monomer mass) initiator (1wt% ammonium persulfate solution), react at 60℃ for 2h; the resulting product is diluted with water to a mass concentration of 0.4-1.0wt% Aqueous solution, which is the base fluid of a graft type fracturing fluid;

[0026] The base fluid of the graft type fracturing fluid is kept at 30°C for 4 hours. After adjusting the pH of the system to 6.5, add potassium aluminum sulfate and ammonium persulfate aqueous solutions under stirring. The usage amounts of potassium aluminum sulfate and ammonium persulfate are respectively 0.5wt% and 0.05wt% of the mass of the fracturing fluid, a graft type fracturing fluid can be obtained.

[0027] Fixed 170S -1 Shear rate, measure the apparent viscosit...

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Abstract

The present invention relates to grafting type fracturing fluid comprising grafting type glue 0.4-1.0 wt %, metal cross-linking agent 0.05-0.7wt %, cracking oxidant 0.05-0.5wt % and water for the rest. The grafting type fracturing fluid of the present invention may be used to replace glue of natural plant material, and has water insoluble matter content as low as 1.0-3.0 wt %, residue after cracking of 20-60 mg/L and low cost.

Description

Technical field [0001] The invention belongs to the technical field of water-based fracturing fluids, and relates to a graft type fracturing fluid and a preparation method. Background technique [0002] Fracturing fluid can increase production of oil wells and increase injection of water wells. Generally used can be divided into oil-based fracturing fluid and water-based fracturing fluid. Among them, the water-based fracturing fluid is not only safe and cheap, but also has high viscosity, low friction and easy flowback. Therefore, it is widely used. At present, water-based fracturing fluid gel forming agents are mostly natural vegetable gums, such as guar gum, Tianqing gum, etc., and polymers, such as polyacrylamide. However, the residue content of the natural vegetable glue gel forming agent after breaking the gel is as high as 20-30%, which harms the permeability of the formation and the conductivity of the sand-filled cracks. Although the polymer gel-forming agent has low resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 王丕新徐昆张文德宋春雷刘晓光苏雪峰项盛
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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