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A kind of water-soluble PVA fiber and its preparation method and application

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

Active Publication Date: 2020-07-03
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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  • A kind of water-soluble PVA fiber and its preparation method and application
  • A kind of water-soluble PVA fiber and its preparation method and application
  • A kind of water-soluble PVA fiber and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1: Preparation of water-soluble PVA fiber, the main steps are as follows:

[0040] (1) Preparation of spinning dope: Dissolve PVA with a degree of polymerization of 1600 and an alcoholysis degree of 86.0 (mol)% and boric acid in water to prepare a spinning dope. The mass concentration of PVA in the dope is 15%, and boric acid is added. The amount is 0.5% of the mass of the PVA, the stock solution is heated to 105°C, and the pressure is maintained at 0.08MPa. After dissolving for 12 hours, it is filtered and defoamed, and enters the spinning process.

[0041] (2) Spinning: The PVA stock solution is sent to the spinning assembly with a metering pump, and the PVA stock solution is sprayed into the coagulation bath from the small holes of the spinneret. The components of the coagulation bath are 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. PVA is spun thr...

Embodiment 11

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

[0052] Step 1: Under stirring conditions, add 0.2 weight parts of thickening agent hydroxypropyl guar gum (China Petroleum Material Kunshan Company), 0.12 weight parts of sodium carbonate, and 0.1 weight parts of potassium chloride to 100 weight parts of water, and then stir for 20 minutes, Obtain an aqueous solution of guar gum thickening agent;

[0053] Step 2: Under stirring conditions, add 0.2 parts by weight of the crosslinking agent aluminum nitrate to the thickener aqueous solution to obtain a guar gum fracturing fluid (without 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 fibers to a length of 10 mm, and add to the oil and gas field fracturing fluid for uniform dispersion to obtain fiber-containing guar gum fracturing fluid.

[0055]...

Embodiment 12

[0057] With reference to Example 11, the high-strength and high-modulus PVA fiber prepared in Example 2 was cut to a length of 6mm, and added to the oil and gas field fracturing fluid to be evenly dispersed. When PVA fiber was added, it was in the early stage of fracturing, middle stage of fracturing and fracturing. 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 the oil and gas field. The mass content of PVA fibers in the fracturing fluid of the oil and gas field 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 a PVA fiber, in particular to a PVA fiber and a preparation method and application thereof. Background technique [0002] PVA (polyvinyl alcohol) fiber is a kind of fiber with excellent performance. It 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 in shallow sea laver breeding nets, high-performance ropes, tire cords, industrial fabrics, cement reinforcement materials, and plastics and rubber reinforcement materials. It has broad market potential. [0003] In recent years, domestic and foreign researchers have continued to carry out a lot of research around PVA fiber. CN200510057435A discloses a method for preparing high-performance polyvinyl alcohol fiber. The method adopts a compound modifier composed of a nitrogen-containing compound, a hydrophilic auxiliary...

Claims

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Application Information

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Patent Type & Authority Patents(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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