Preparation method of polyacrylamide nano composite fracturing fluid

A polyacrylamide and nano-composite technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of poor high temperature resistance and low application efficiency, and achieve the effect of less degradation residue and improving oil and gas production.

Active Publication Date: 2014-10-22
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a preparation method of polyacrylamide inorganic nanocomposite fracturing fluid, to solve the problems of the prior art fracturing fluids in shear resistance, poor high temperature resistance and low application efficiency

Method used

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  • Preparation method of polyacrylamide nano composite fracturing fluid
  • Preparation method of polyacrylamide nano composite fracturing fluid
  • Preparation method of polyacrylamide nano composite fracturing fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1 Preparation of nano-inorganic phase of polyacrylamide nanocomposite fracturing fluid

[0035] First, the co-precipitation method is used to prepare the hydrotalcite slurry, magnesium nitrate and aluminum nitrate are dissolved in a certain amount of distilled water according to the molar ratio of 2: 1, sodium hydroxide and 2-acrylamido-2-methylpropanesulfonic acid ( AMPS) was dissolved in a certain amount of distilled water at a molar ratio of 1:1, and the sodium hydroxide / AMPS aqueous solution was slowly added dropwise into the magnesium nitrate / aluminum nitrate mixed solution under high-speed stirring, and 3mol / L sodium hydroxide was slowly added dropwise after stirring evenly The solution adjusts the pH value of the solution to about 10 to prepare a hydrotalcite slurry.

[0036] Next, add 20g of montmorillonite and 400mL of deionized water into a 1000mL three-neck flask, disperse evenly and then heat. After the water bath is heated to 80°C, slowly add cetylt...

Embodiment 2

[0037] The preparation of embodiment 2 polyacrylamide nanocomposite thickener

[0038] Dissolve 300g of acrylamide in 600g of deionized water, add a certain amount of cosolvent urea to the acrylamide solution, complexing agent edetate disodium, add sodium hydroxide to adjust the pH to about 10.5, add 140mL of nano inorganic phase to suspend Put the above solution into the adiabatic polymerization device, pass nitrogen gas to remove oxygen for 20min, add 0.24g of azo initiator azobisisobutyronitrile, 0.24g of oxidizing agent ammonium persulfate and 0.18g of reducing agent sodium bisulfite every 3min, The polymerization reaction was started for 3h. Then adjust the temperature to 100°C and hydrolyze for 3h. The colloid is taken out and diced, dried at 80° C., and pulverized to obtain a polyacrylamide nano-composite material. The size of the inorganic dispersed phase is 20-25 nm, and a modified polyacrylamide nano-composite thickener is obtained.

Embodiment 3～6

[0039] Example 3-6 Preparation of polyacrylamide nanocomposite fracturing fluid

[0040] Add 350mL of deionized water, 15.21g of montmorillonite, 4.97g of intercalation agent sodium dodecylsulfonate, and 0.1mol / L hydrochloric acid into a 1000mL three-neck flask to adjust the pH value to about 5, and perform intercalation in a water bath at 80°C. The layers were reacted for 12 hours. After stopping the reaction, when the temperature of the solution drops to room temperature, add the polyacrylamide inorganic nanocomposite thickener with the mass fraction set to 0.15%, 0.20%, 0.25%, and 0.30% respectively under high-speed stirring, and complete stirring until After the thickener is completely dissolved, add the crosslinking agent ZrOCl 2 2g, gel breaker ammonium persulfate 2g, clay stabilizer KCl 1.5g, bactericide tetradecyl quaternary ammonium salt 1.5g, drainage aid OP-10 1.5g, stir well to obtain polyacrylamide nanocomposite fracturing fluid. The measurement results with a s...

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Abstract

The invention adopts polyacrylamide and a nano inorganic phase to prepare a polyacrylamide nano composite material through an in-situ polymerization method and then forms a fracturing fluid thickening agent. The nano inorganic phase is prepared by mixing the products of intercalation reactions between an organic long-chain intercalator and layered silicate with magnesium nitrate and aluminum nitrate. The nano inorganic phase, acrylamide monomer, a coupling agent, a complexing agent, an initiator, an oxidant, a reductant, a cosolvent, an auxiliary agent, and deionized water form a suspension fluid reaction system, and the polyacrylamide nano composite material is formed after the polymerization-intercalation composite reactions. The polyacrylamide nano composite material with a mass percentage of 0.25% is taken as the thickening agent, and then is mixed with a crosslinking agent with a mass percentage of 0.20%, a gel breaker with a mass percentage of 0.20%, and other auxiliary agents to form a fracturing fluid system. The system is sheared for 70 minutes under a shearing speed of 170 s<-1> at a temperature of 150 DEG C so as to form a fracturing fluid with a viscosity larger than 50 mPa.s, and the fracturing fluid has the characteristics of high temperature resistance, shearing resistance, low frictional resistance, complete glue breaking effect, and good compatibility with the formation fluid.

Description

technical field [0001] This article relates to a preparation method of polyacrylamide nanocomposite fracturing fluid, which belongs to the technical field of fracturing fluid in oil exploitation engineering. Background technique [0002] Fracturing is an engineering process of oil and gas exploitation. It is a process of using pressure equipment to press a liquid with a certain viscosity into cracks in underground rocks under high pressure. The liquid with viscosity used in the fracturing process is fracturing. liquid. The fracturing fluid enters the formation rock under high pressure, causing the rock to break and cracks appear. Adding proppant materials to the fracturing fluid can support the opening state of the underground fractures, so that an obvious tension line is formed after the pumping of the fracturing fluid is stopped. Open rock fractures, improve the permeability of oil and gas layers, and increase the flow or production of oil and gas through fracture channel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C08L33/24C08F120/56C08F2/44C08F2/10C08K9/04C08K9/06C08K3/34C08K3/22
CPCC08F4/40C08F120/56C09K8/665C09K8/68C09K8/882
Inventor 柯扬船赵洋洋
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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