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

A fiber and dissolution temperature technology, applied in the directions of spinning solution preparation, fiber chemical characteristics, chemical instruments and methods, etc., can solve the problems of formation pollution, use restrictions, etc., and achieve the effect of reducing damage, reducing dosage, and achieving good results.

Active 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

Due to their own properties, these fibers are either difficult to be used in the field of oil and gas fields (such as oil and gas field cementing, oil and gas field fracturing temporary plugging construction, oil and gas field fracturing construction, etc.), or they are difficult to degrade and cause formation pollution, so their use is greatly restricted. limit

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: prepare water-soluble PVA fiber, main steps are as follows:

[0040] (1) Preparation of spinning stock solution: the degree of polymerization is 1600, the degree of alcoholysis is 86.0 (mol)% PVA and boric acid are dissolved in water and made into spinning stock solution, the mass concentration of PVA in stock solution is 15%, boric acid is added The amount is 0.5% of the PVA mass, the stock solution is heated up to 105 ° C, and the pressure is maintained at 0.08 MPa, dissolved for 12 hours, then filtered, defoamed, and then 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 dimethyl sulfoxide, methanol and ethanol, the mass ratio of dimethyl sulfoxide, methanol and ethanol is 13:25:41, the temperature of the coagulation bath is -5°C, and...

Embodiment 11

[0051] This embodiment provides a fiber-containing guar gum fracturing fluid, the preparation method of which is as follows:

[0052] Step 1: under stirring condition, add 0.2 weight part of thickener hydroxypropyl guar gum (China Petroleum Substances Kunshan Company), 0.12 weight part of sodium carbonate, 0.1 weight part of potassium chloride to 100 weight parts of water, then stir for 20min, Obtain guar thickener aqueous solution;

[0053] Step 2: under stirring conditions, add 0.2 parts by weight of crosslinking agent aluminum nitrate to the above-mentioned thickener aqueous solution to obtain guar gum fracturing fluid (excluding fiber guar gum fracturing fluid);

[0054] Step 3: Add 0.5 parts by weight of the PVA fiber prepared in Example 1 to the above-mentioned guar gum fracturing fluid, cut the fiber to a length of 10 mm, add it to the oil and gas field fracturing fluid and disperse evenly, and obtain the fiber-containing guar gum fracturing fluid.

[0055] Step 4: Add...

Embodiment 12

[0057] Referring to Example 11, cut the high-strength and high-modulus PVA fibers obtained in Example 2 to a length of 6 mm, add them to the oil and gas field fracturing fluid, and disperse evenly. In the final stage, PVA fibers are added to the fracturing fluid in three steps. Guar gum and crosslinking agent are also added to the fracturing fluid of oil and gas fields. The mass content of PVA fibers in the fracturing fluid of oil and gas fields is 1.2%.

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Abstract

A PVA (polyvinyl alcohol) fiber is prepared, through spinning, from PVA with polymerization degree being 1500-2500 and alcoholysis degree Ad meeting a relation that Ad (mol / mol) is larger than or equal to 86% and smaller than or equal to 95.0%. The PVA fiber has special water solubility, and can improve the sand carrying capacity of fracturing fluid when used in fracturing construction of oil and gas fields; due to the good water solubility, the product can flow back to the ground timely after fracturing construction, and accordingly, production increase of the oil and gas fields is promoted greatly. A preparation method is simple and suitable for industrial production.

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] PVA (polyvinyl alcohol) fiber is a kind of fiber with excellent performance, which has the characteristics of high strength, high modulus, low elongation, etc., as well as excellent wear resistance, seawater corrosion resistance, weather resistance and good interface with the substrate It is widely used as nets for shallow sea laver cultivation, high-performance ropes, tire cords, industrial fabrics, cement reinforcement materials, plastic and rubber reinforcement materials, etc., and has broad market potential. [0003] In recent years, researchers at home and abroad have continued to carry out a lot of research on PVA fibers. CN200510057435A discloses a method for preparing high-performance polyvinyl alcohol fibers. The method uses a compound modifier composed of nitrogen-containing compounds, hydrophilic auxili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/50D01F1/10D01F11/06D01D1/02D01D5/06C09K8/68C09K8/70C09K8/508C09K8/512C09K8/516C09K8/42
CPCC09K8/42C09K8/5083C09K8/512C09K8/516C09K8/68C09K8/685C09K8/70C09K2208/08C09K2208/24C09K2208/26D01D1/02D01D5/06D01F1/10D01F6/50D01F11/06
Inventor 王华全王建周霖李海英向鹏伟
Owner CHINA PETROCHEMICAL CORP
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