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Oil-soluble temporary blocking agent and preparation method thereof

An oil-soluble temporary plugging agent and technology of temporary plugging agent, applied in chemical instruments and methods, rayon manufacturing, single-component polyester rayon, etc., can solve the problems of high cost and difficult to use on a large scale

Inactive Publication Date: 2015-08-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many types of oil-soluble temporary plugging agents developed, but the cost is too high, and it is difficult to use them on a large scale. It is necessary to develop new low-cost oil-soluble temporary plugging agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] Example 1:

[0017] Melt electrospinning is carried out with bulk phenolic resin as the spinning raw material, the spinning distance is 8cm, the spinning voltage is 40kV, the frequency and pulse indication of the high-voltage power supply are 2.12KHz and 32.5% duty cycle, and the spinning temperature is 160°C .

[0018] The resulting spun product is a short fiber with a length of less than 1 cm and an average diameter of 4.4 μm. About 1 g of the above-mentioned fiber is taken. It has good oil solubility in 10 ml of petroleum at 90 ° C. The dissolution time is 30 minutes, and the dissolution rate is greater than 95%. After 2 hours, Short fibers dissolve completely.

[0019] Example 2:

[0020] Melt electrospinning is carried out with granular polypropylene as the spinning raw material, the spinning distance is 10cm, the spinning voltage is 60kV, the frequency and pulse indication of the high-voltage power supply are 1.41 KHz and 0.9% duty cycle respectively, and the s...

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Abstract

The present invention discloses an oil-soluble temporary blocking agent and a preparation method thereof, wherein a thermoplastic polymer or a mixture comprising a thermoplastic polymer and one or a plurality of materials selected from a surfactant, an antioxidant and a coupling agent is adopted as a spinning raw material and is subjected to melt electrospinning to prepare the oil-soluble temporary blocking agent. According to the present invention, the oil-soluble temporary blocking agent can be adopted as the temporary blocking agent so as to be applied in the petroleum extraction field, such that the purposes of low cost and complete petroleum extraction and no pollution are achieved; the average diameter of the obtained temporary blocking agent of the present invention is a few microns to tens of microns, even achieves the nano-scale, the distribution is wide, and the oil-soluble temporary blocking agent is suitable for various types of oil wells with complex structures, particularly the temporary blocking operation on the core with the small crack width; the oil-soluble temporary blocking agent has characteristics of high oil dissolution rate, water insolubility, acid insolubility, low residual pollution on stratum, high solubility in diesel fuel, and easy blocking releasing; and the preparation method has characteristics of easily available raw materials, simple preparation process, low cost, and good applicability.

Description

technical field [0001] The invention relates to the use of melt electrospinning technology to prepare a temporary plugging agent, which has good oil solubility, so that it can be used as a temporary plugging agent in the field of oil exploitation to achieve low-cost, fully exploited oil and no pollution. The purpose belongs to the field of oilfield chemicals. Background technique [0002] With a large number of mature oilfields entering the dry production period one after another, the redevelopment of water injection oilfields has become a research hotspot all over the world. However, only 25%~35% of underground crude oil can be obtained even after water injection development, and there are still a large number of undeveloped reservoirs or oil layers with low production degree in the oil layers. Water injection production not only has low recovery efficiency, but also with the long-term continuous development of water injection oilfields, after entering the middle and late ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/76D01F6/30D01F6/60D01F6/62D01F6/46D01F6/90D01F6/94D01F6/92D01F1/10C09K8/508
Inventor 刘勇谢概王嫱
Owner BEIJING UNIV OF CHEM TECH
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