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PVA (polyvinyl alcohol) fiber as well as preparation method and application thereof

A fiber and section technology, applied in the field of PVA fiber and its preparation, to achieve high breaking strength and modulus, lower viscosity, and less formation damage

Inactive Publication Date: 2017-10-20
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although domestic and foreign counterparts have made a lot of efforts, so far, the existing fracturing technology still cannot achieve the purpose of reducing the damage of fracturing fluid to the reservoir and improving the sand-carrying performance.

Method used

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  • PVA (polyvinyl alcohol) fiber as well as preparation method and application thereof
  • PVA (polyvinyl alcohol) fiber as well as preparation method and application thereof
  • PVA (polyvinyl alcohol) fiber as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: adopt following steps to prepare PVA fiber:

[0040] (1) preparation of spinning stock solution: be 1750 with degree of polymerization, degree of alcoholysis is 99.5 (mol)% PVA and boric acid, sulfuric acid, acetic acid are dissolved in water and are made into spinning stock solution, wherein the mass concentration of PVA in stock solution is 7%, the amount of boric acid added is 0.3% of the mass of PVA, the molar ratio of sulfuric acid to acetic acid is 1:1, the pH of the stock solution is 3.5, the temperature of the stock solution is raised to 95°C, and the pressure is maintained at 0.08MPa, dissolved for 10 hours under normal pressure for defoaming After 3 hours, it enters the spinning process.

[0041] (2) Spinning: The PVA stock solution is sent to the spinning assembly by a metering pump, and the PVA stock solution is sprayed into the coagulation bath from the small hole of the spinneret. The composition of the coagulation bath is sodium sulfate and...

Embodiment 2

[0045] Embodiment 2: adopt following steps to prepare PVA fiber:

[0046] (1) Preparation of spinning stock solution: the degree of polymerization is 2000, alcoholysis degree is 99.9 (mol)% PVA and boric acid, sulfuric acid, acetic acid are dissolved in water and made into spinning stock solution, wherein the mass concentration of PVA in stock solution is 14%, the amount of boric acid added is 0.5% of the mass of PVA, the molar ratio of sulfuric acid to acetic acid is 4:1, the pH of the original solution is 3.8, the temperature of the original solution is raised to 100°C, and the pressure is kept at 0.10MPa, dissolved for 15 hours under normal pressure and defoamed After 5 hours, it enters the spinning process.

[0047] (2) Spinning: The PVA stock solution is sent to the spinning assembly by a metering pump, and the PVA stock solution is sprayed into the coagulation bath from the small hole of the spinneret. The composition of the coagulation bath is sodium sulfate and ammoni...

Embodiment 3

[0050] Embodiment 3: adopt following steps to prepare PVA fiber:

[0051] (1) preparation of spinning stock solution: be 1500 with degree of polymerization, degree of alcoholysis is 99.9 (mol)% PVA and boric acid, sulfuric acid, acetic acid are dissolved in water and are made into spinning stock solution, wherein the mass concentration of PVA in stock solution is 20%, the amount of boric acid added is 0.8% of the mass of PVA, the molar ratio of sulfuric acid to acetic acid is 6:1, the pH of the stock solution is 4.3, the temperature of the stock solution is raised to 105°C, and the pressure is maintained at 0.09MPa, dissolved for 10 hours under normal pressure for defoaming After 6 hours, it enters the spinning process.

[0052] (2) Spinning: The PVA stock solution is sent to the spinning assembly by a metering pump, and the PVA stock solution is sprayed into the coagulation bath from the small hole of the spinneret. The composition of the coagulation bath is sodium sulfate a...

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Abstract

The invention provides a PVA (polyvinyl alcohol) fiber. A radial cross section of a morphologic structure of the PVA fiber is of a skin-core structure, wherein skin thickness is 1.0-10 mu m, the radial cross section is cocoon-shaped, the PVA fiber is prepared from PVA with polymerization degree being 1000-2500 and alcoholysis degree being 99.0%-99.9%, single-fiber linear density of the PVA fiber is 1-10 dtex, dry breaking strength is higher than or equal to 3.5 cN / dtex, and dispersibility is lower than or equal to three levels. The PVA fiber has a special surface structure and can be better combined with a propping agent such as quartz sand, pottery clay and the like when used for fracturing fluid of oil and gas fields, so that sand-carrying capacity of the fracturing fluid is greatly improved, meanwhile, the propping agent can be effectively prevented from flowing back with the fracturing fluid, and yield increase of the oil and gas fields is promoted. The preparation method is simple and suitable for industrial production.

Description

technical field [0001] The invention relates to PVA (polyvinyl alcohol) fibers, in particular to a PVA fiber and its preparation method and application. Background technique [0002] my country's low-permeability oil and gas resources are huge, accounting for more than 70% of the total proven reserves, and are the main potential areas for increasing reserves and production in the future. This type of oil and gas resources has the characteristics of three lows, that is, low proven rate, low natural production rate, and low recovery rate. Fracturing is an important technical measure for increasing production of oil and gas fields and increasing injection of water injection wells. The performance of fracturing fluid is the key factor for the success of fracturing. At present, the commonly used fracturing fluids at home and abroad are water-based fracturing fluids, among which the water-based fracturing fluids with natural vegetable gum as the thickener are the most widely use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/50D01F1/10D01D5/34D01D5/06C09K8/68C09K8/70
CPCD01F6/50C09K8/68C09K8/70C09K2208/08D01D5/06D01D5/34D01F1/10
Inventor 周霖王华全刘建华徐小松王建
Owner CHINA PETROCHEMICAL CORP
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