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High-hydroscopicity polymer resin microcapsule and its production process

A high water absorption, production process technology, applied in microcapsule preparation, microsphere preparation, wellbore/well components, etc., to achieve the effect of convenient use, small dosage and good sealing effect

Inactive Publication Date: 2004-04-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there has been no report on the development of microcapsules for oil field plugging.

Method used

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  • High-hydroscopicity polymer resin microcapsule and its production process
  • High-hydroscopicity polymer resin microcapsule and its production process

Examples

Experimental program
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Effect test

Embodiment Construction

[0008] 1. Pass the core material through a standard sieve of 28 mesh to 38 mesh, and use the particles within this particle size range as the core material.

[0009] 2. Weigh a certain amount of hardened lard with a melting point of 56°C and melt it, take 400ml in a beaker, and place it in a constant temperature water bath at 90°C.

[0010] 3. Take 900g of sieved core material and put it in the fluidized bed. The fluidized air volume is 200m 3 / h under the condition of fluidization.

[0011] 4. The volume of compressed air is 0.64m 3 / h, the feed rate is 124ml / h, under the condition that the feed liquid is sprayed onto the surface of the core material through the two-fluid nozzle.

[0012] 5. The bed temperature was kept at 34°C and operated continuously for 2.5 hours. Take out the solidified microcapsule particles.

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PUM

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Abstract

The present invention belongs to the field of microcapsule preparing technology. The high-hydroscopicity polymer resin microcapsule has wall material of hardened oil with smelting point higher than 40 deg.c and core material of acrylic acid and acrylamide polymer. The preparation process includes smelting the wall material, fluidizing the core material, air suspension spraying, solidifying and other stages. The present invention solves the problem of high-hydroscopicity polymer to absorb water to denature, makes it possess excellent flowability and prepares microcapsule with targeting release feature. The wrapping material separates the high-hydroscopicity matter from targeting release feature. The wrapping material separates the high-hydroscopicity matter from outer environment, and under certain environment condition, the core material may be released fast to absorb water and to expand. The said process of the present invention is suitable for forming microcapsule with solid core material, and is simple, practical, good in filming performance and homogeneous in embedding.

Description

technical field [0001] The invention belongs to the technical field of microcapsule preparation, and uses microencapsulation technology to coat a superabsorbent resin core material in a wall material with a small particle size to form a new microcapsule product. Background technique [0002] With the reduction of underground oil reserves, oil needs deep mining. However, as the depth increases, the underground terrain becomes more and more complicated, loopholes increase, and short circuits often occur, which brings great difficulties to mining. This requires plugging. There are many methods and materials for plugging, such as NFDF8012 plugging agent, which is mainly composed of Phoebe root powder, humate, carboxymethyl cellulose and other polymer compounds. Drilling plugging agent; YYCM plugging agent is a combination of solution plugging agent and suspended inorganic matter, which can stop water or leak. At present, bridging agent mud and gel mud are mostly used as oilfie...

Claims

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Application Information

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IPC IPC(8): B01J13/02E21B33/12
Inventor 于才渊王宝和刘永霞王晓光
Owner DALIAN UNIV OF TECH
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