A kind of high-strength high-modulus PVA fiber and its preparation method and application

A fiber and application technology, applied in the field of PVA fiber and its preparation, to achieve the effects of short gel breaking time, good sand suspension effect and little formation damage

Active Publication Date: 2020-07-10
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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  • A kind of high-strength high-modulus PVA fiber and its preparation method and application
  • A kind of high-strength high-modulus PVA fiber and its preparation method and application
  • A kind of high-strength high-modulus PVA fiber and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: adopt the following steps to prepare high-strength and high-modulus PVA fibers:

[0047] (1) Preparation of spinning stock solution: the degree of polymerization is 1700, the degree of alcoholysis is 99.5 (mol)% PVA and boric acid, titanium dioxide are dispersed in water and made into spinning stock solution, wherein the mass concentration of PVA in the stock solution is 16% , the addition of boric acid is 1.2% of the mass of PVA, the addition of titanium dioxide is 0.25% of the mass of PVA, the stock solution is heated to 100°C, and the pressure is maintained at 0.10MPa, dissolved for 8 hours, and then it enters the spinning process after standing for 3 hours under normal pressure for defoaming process.

[0048] (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 sulf...

Embodiment 2

[0051] Embodiment 2: adopt the following steps to prepare high-strength and high-modulus PVA fibers:

[0052] (1) Preparation of spinning stock solution: the degree of polymerization is 2400, the degree of alcoholysis is 99.8 (mol)% PVA and boric acid, titanium dioxide are dispersed in water and made into spinning stock solution, wherein the mass concentration of PVA in the stock solution is 14% , the amount of boric acid added is 1.8% of the mass of PVA, the amount of added titanium dioxide is 0.4% of the mass of PVA, the stock solution is heated to 105°C, and the pressure is maintained at 0.08MPa, dissolved for 10 hours and left to stand under normal pressure for 6 hours after defoaming, then enter the spinning process .

[0053] (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 sulfat...

Embodiment 3

[0056] Embodiment 3: adopt the following steps to prepare high-strength and high-modulus PVA fibers:

[0057] (1) Preparation of spinning stock solution: the degree of polymerization is 2000, the degree of alcoholysis is 99.9 (mol)% PVA and boric acid, titanium dioxide are dispersed in water and made into spinning stock solution, wherein the mass concentration of PVA in the stock solution is 13% , the addition of boric acid is 1.0% of the mass of PVA, the addition of titanium dioxide is 3.0% of the mass of PVA, the stock solution is heated to 100°C, and the pressure is maintained at 0.06MPa. After dissolving for 9 hours, it is left to stand under normal pressure for 5 hours of defoaming, and then it enters spinning process.

[0058] (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 sulfa...

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Abstract

The invention discloses a high-strength and high-modulus PVA (polyvinyl alcohol) fiber as well as a preparation method and an application thereof. The PVA fiber is prepared from PVA with the polymerization degree of 1,000-2,500 and the alcoholysis degree of 99.2-99.9(mol)%, has the single fiber density of 1-5 dtex, the dry break strength larger than or equal to 10 cN / dtex and the dispersity smaller than or equal to class 3. The PVA fiber has degradability and high sand carrying capacity, is very applicable to oil and gas field fracturing fluids, oil and gas field well cementing agents, oil and gas field temporary plugging agents, battery separators, cement concrete reinforcement and other fields and cannot cause new pollution to environment.

Description

technical field [0001] The invention relates to PVA 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 used. However, since t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/50D01F1/10D01D5/06D01D5/12D01D10/02C09K8/68C09K8/50C04B16/06H01M2/16
CPCC04B16/0641C09K8/50C09K8/685C09K8/882C09K8/887C09K8/90C09K2208/08C09K2208/24C09K2208/26D01D5/06D01D5/12D01D10/02D01F1/10D01F6/50H01M50/411H01M50/44Y02E60/10
Inventor 王华全周霖王建向鹏伟张振宇
Owner CHINA PETROCHEMICAL CORP
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