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Degradable material for temporary plugging and fracturing and preparation method thereof

A technology for degrading materials and fracturing, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of few innovative achievements, and achieve the effects of good hardness and dispersibility, low crystallinity, and fast degradation speed

Inactive Publication Date: 2020-06-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, in the drilling process of reservoir well sections in my country, although water-soluble, acid-soluble and oil-soluble temporary plugging agents have been widely used, and temporary plugging technology has been vigorously promoted, in general, in recent years, there has been little progress in this area. There are not many innovative achievements. In fact, for some special oil and gas reservoirs, such as fractured reservoirs, gas reservoirs, and high-temperature reservoirs, there are still many technical problems to be studied and solved on how to scientifically implement temporary plugging technology to protect oil and gas layers.

Method used

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  • Degradable material for temporary plugging and fracturing and preparation method thereof
  • Degradable material for temporary plugging and fracturing and preparation method thereof
  • Degradable material for temporary plugging and fracturing and preparation method thereof

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preparation example Construction

[0067] The preparation method of the above-mentioned degradable material for temporary plugging and fracturing comprises the following steps:

[0068] 1) Mix the caprolactide with the catalyst, and then under the protection of nitrogen, polymerize at 140-180°C for 1-5 hours to obtain the caprolactide copolymer; wherein, the catalyst is stannous octoate, and the amount of the catalyst is caprolactide 0.1 to 0.3% of the mass of the

[0069] Mix lactide with a catalyst, and then polymerize at 130-180°C for 1-5 hours under the protection of nitrogen to obtain a lactide copolymer; wherein, the catalyst is stannous octoate, and the amount of the catalyst is the mass of lactide 0.1~0.3% of

[0070] In terms of mass percentage, it includes 40%-55% of polylactone monomer A material, 44.3%-56% of polylactone monomer B material, 0.1%-1% of antioxidant, 0.1%-1% of heat stabilizer and Impact modifier 0.5%-2%;

[0071] Mix caprolactone copolymer, lactide copolymer, antioxidant, heat stab...

Embodiment 1

[0086] A method for preparing a degradable material for temporary plugging and fracturing, comprising the following steps:

[0087] 1) Mix caprolactide with a catalyst, and then polymerize at 140° C. for 5 hours under the protection of nitrogen to obtain a caprolactide copolymer; wherein, the catalyst is stannous octoate, and the amount of the catalyst is 0.1% of the mass of caprolactide. %;

[0088] Mix lactide with a catalyst, and then polymerize at 140° C. for 3 hours under the protection of nitrogen to obtain a lactide copolymer; wherein, the catalyst is stannous octoate, and the amount of the catalyst is 0.2% of the mass of lactide;

[0089] In terms of mass percentage, polylactone monomer A is 55%, polylactone monomer B is 44.3%, antioxidant 0.1%, heat stabilizer 0.1% and impact modifier 0.5%, polylactone monomer A, polylactone monomer B, antioxidant, heat stabilizer and impact modifier, mixed uniformly to obtain a mixed sample;

[0090] Wherein, the polylactone monomer ...

Embodiment 2

[0102] A method for preparing a degradable material for temporary plugging and fracturing, comprising the following steps:

[0103] 1) Mix caprolactide with a catalyst, then polymerize at 150°C for 3 hours under nitrogen protection to obtain a caprolactide copolymer; wherein, the catalyst is stannous octoate, and the amount of the catalyst is 0.2% of the mass of caprolactide. %;

[0104] Mix lactide with a catalyst, and then polymerize at 160° C. for 2 hours under the protection of nitrogen to obtain a lactide copolymer; wherein, the catalyst is stannous octoate, and the amount of the catalyst is 0.1% of the mass of lactide;

[0105] In terms of mass percentage, polylactone monomer A is 48%, polylactone monomer B is 50%, antioxidant 0.5%, heat stabilizer 0.5% and impact modifier 1%, polylactone monomer A, polylactone monomer B, antioxidant, heat stabilizer and impact modifier, mixed uniformly to obtain a mixed sample;

[0106] Wherein, the polylactone monomer A is a caprolac...

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Abstract

The invention provides a degradable material for temporary plugging and fracturing and a preparation method thereof. In the weight percentage, the preparation method of the degradable material for temporary plugging and fracturing comprises the following steps: uniformly mixing 40%-55% by mass of a caprolactone copolymer, 44.3%-56% by mass of a lactide copolymer, 0.1%-1% by mass of an antioxidant,0.1%-1% by mass of a heat stabilizer and 0.5%-2% by mass of an impact modifier to obtain a mixed sample; a mixed sample is stirred by double screws of the double-screw extruder, extruded from a machine head, drooped to fall into the water tank, pulled to the traction machine, conveyed to a clamping groove of the granulator, crushed and sieved to obtain the degradable material for temporary plugging and fracturing. The random copolymer of aliphatic polyester is prepared from a caprolactone copolymer and a lactide copolymer through melt processing. At the moment, the material is granular and has proper hardness and dispersity and better heat resistance and machinability, so that the degradable material with higher degradation speed and lower crystallinity is prepared.

Description

technical field [0001] The invention relates to a plugging material, in particular to a degradable material for temporary plugging and fracturing and a preparation method thereof. Background technique [0002] With the gradual rise in the price of petroleum products, the re-development of oilfields around the world has become a hot spot. At present, most oilfields in various countries are developed by water injection. Even after water injection development, only 25%-35% of underground crude oil can be obtained. There are still a large number of undeveloped reservoirs or oil layers with a low degree of production. With the continuous development of water injection oilfields for a long time, after entering the middle and late stages of development, the comprehensive water cut of oilfields has risen, and the production efficiency of oilfields has deteriorated year by year. Most of the countries adopt short-term temporary plugging of certain levels of operating wells to extract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L51/04C08K5/053C08K5/103C08K5/526C08G63/08C08G63/85C09K8/508
CPCC08G63/08C08G63/823C08L67/04C08L2201/06C08L2205/025C08L2205/03C08L2205/06C09K8/508C08L51/04C08K5/053C08K5/103C08K5/526
Inventor 谭鑫薛泽华惠永豪陈飞
Owner XI AN JIAOTONG UNIV