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High-temperature-resistant gelled fracturing fluid, and preparation method and application thereof

A gel fracturing fluid and fracturing fluid technology, applied in chemical instruments and methods, earthwork drilling, mining fluids, etc., can solve the problems of general salt resistance and shear resistance, and achieve strong sand-carrying ability and cross-linking Simple, good jelly elasticity

Active Publication Date: 2014-01-01
PETROCHINA CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional organic boron cross-linked fracturing fluids are only suitable for use at a temperature of 150°C, and it is difficult to maintain good performance at ultra-high temperatures (above 180°C)
In recent years, research on polymer thickeners based on modified polyacrylamide has been widely carried out at home and abroad, and mainly focuses on the introduction of new monomers and acrylamide copolymerization research, but its temperature resistance generally does not exceed 200 ° C, and Salt resistance and shear resistance are average

Method used

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  • High-temperature-resistant gelled fracturing fluid, and preparation method and application thereof
  • High-temperature-resistant gelled fracturing fluid, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add anionic polyacrylamide polymer in 98kg of water (this embodiment polymer thickener adopts 58.8kg of acrylamide, 24.5kg of 2-acrylamido-2-methyl propane sulfonic acid, methyl diallyl chloride Ternary polymerization of ammonium chloride 14.7kg, nitrogen deoxygenation, reaction temperature 10°C, reaction time 4h, molecular weight 461×10 4 ) 400g fully dissolved, add delayed cross-linking agent (the ratio of sodium gluconate, glycerol and water is mass ratio 25%:10%:65%) 50g, non-ionic surfactant (FACM-41) 0.5L , 50g of ammonium persulfate, then add 0.05L of 20% hydrochloric acid to adjust the pH of the system to 3-4, and configure it as a base solution. Add 1L of the cross-linking agent organic zirconium oxychloride solution into the base fluid and stir to form a jelly fracturing fluid. The gel forming time of the obtained jelly fracturing fluid is 1min. The jelly is transparent, has good elasticity, and has strong sand-carrying performance , the sand ratio is 20%, an...

Embodiment 2

[0038] Add anionic polyacrylamide polymers into 97.2kg of water (this embodiment uses acrylamide 68.04kg, 2-acrylamido-2-methylpropanesulfonic acid 14.58kg, methyldiallyl Ternary polymerization of ammonium chloride 14.58kg, deoxygenation by passing nitrogen gas, reaction temperature 25°C, reaction time 4h, molecular weight 450×10 4 ) 600g fully dissolved, add delayed cross-linking agent (the ratio of sodium gluconate, glycerol and water is mass ratio 25%:10%:65%) 70g, anionic surfactant (FACM-41) 0.65L, Ammonium persulfate 80g, then add 0.075L of 20% hydrochloric acid to adjust the pH of the system to 2, and configure it as a base solution. Add 1.35L of the cross-linking agent organic zirconium oxychloride solution into the base fluid and stir to form a jelly fracturing fluid. The gel forming time of the obtained jelly fracturing fluid is 45s. The jelly is transparent, has good elasticity, and has sand-carrying properties. Strong, the sand ratio is 20%, the temperature is 90 ...

Embodiment 3

[0040] Add anionic polyacrylamide polymer into 96.8kg of water (the polymer thickener in this example uses 67.76kg of acrylamide, 19.36kg of 2-acrylamido-2-methylpropanesulfonic acid, 19.36kg of methyldiallyl Ternary polymerization of ammonium chloride 9.68kg, nitrogen deoxygenation, reaction temperature 20°C, reaction time 4h, molecular weight 482×10 4 ) 700g fully dissolved, add delayed cross-linking agent (the ratio of sodium gluconate, glycerol and water is mass ratio 25%:10%:65%) 80g, anionic surfactant (FACM-41) 0.75L, Ammonium persulfate 90g, then add 0.085L of 20% hydrochloric acid to adjust the pH of the system to 2, and configure it as a base solution. Add 1.6L of the cross-linking agent organic zirconium oxychloride solution into the base fluid and stir to form a jelly fracturing fluid. The gel forming time of the obtained jelly fracturing fluid is 50s, and the jelly can be hung completely with a glass rod. When the sand ratio is 20% and the temperature is 90°C, th...

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Abstract

The invention relates to a high-temperature-resistant gelled fracturing fluid, and a preparation method and application thereof. The fracturing fluid is mainly prepared from the following components in percentage by mass: 0.4-0.8% of anionic polymer, 0.05-0.20% of crosslinking agent, 0.02-0.16% of pH regulator, 0.01-0.10% of delayed crosslinker, 0.1-0.8% of cleanup additive, 0.01-0.09% of viscosity breaker and the balance of water. The anionic polymer is a terpolymer and is copolymerized from the following components in percentage by weight: 60-70% of acrylamide monomer, 15-25% of anionic monomer, 5-15% of cationic monome, totaling 100%. The fracturing fluid can resist the high temperature of 210 DEG C above, has the advantages of crosslinkability, capability of carrying sand, shear resistance, salt resistance, no residue and the like, and is used for fracturing yield increase of hypotonic high-temperature ultra-deep wells.

Description

technical field [0001] The invention relates to a high-temperature-resistant jelly fracturing fluid, a preparation method and an application thereof. Background technique [0002] With the advancement of oil exploration technology, the development of oil and gas resources continues to develop in depth, and more and more deep wells are developed, and the temperature of some of these deep wells even exceeds 200 °C. However, in the environment of abnormal high temperature and high pressure in deep wells, the existing domestic fracturing fluid systems are not suitable for fracturing such formations. The long chain of vegetable gum polymer degrades rapidly when the temperature reaches 177°C, and when the pH value of the system is low, the cross-linked structure of vegetable gum fracturing fluid is hydrolyzed, especially at high temperature. Traditional organic boron cross-linked fracturing fluids are only suitable for use at a temperature of 150°C, and it is difficult to maintai...

Claims

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Application Information

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IPC IPC(8): C09K8/68E21B43/26
CPCC09K8/602C09K8/685C09K2208/26E21B43/26
Inventor 卢拥军翟文丁云宏王丽伟何良好邱晓惠方波管保山王海燕
Owner PETROCHINA CO LTD
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