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Degradable temporary plugging agent and preparation method thereof

A technology of temporary plugging agent and formula, applied in the field of degradable temporary plugging agent and its preparation, can solve problems such as rapid plugging removal and serious environmental pollution

Active Publication Date: 2021-05-04
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a degradable temporary plugging agent for the problem that the current temporary plugging agent has strong blocking ability and rapid plugging removal, and has serious environmental pollution. It uses inorganic nanoparticles to disperse into polyester materials to form a plugging ability. Temporary plugging agent that is strong, fast in plugging removal, and will not cause environmental pollution

Method used

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  • Degradable temporary plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this example, a degradable temporary plugging agent is prepared, and its formula is: 70% polylactate, 29% polyglycolide, and 1% nano-silicon dioxide in terms of mass fraction.

[0032] Its specific preparation method is:

[0033] S1: Preparation of polyester material

[0034] Weigh the polylactate and polyglycolide according to the formula, and mix them uniformly in advance according to the formula.

[0035] S21: Turn on the twin-roll kneader, set the temperature to 240° C., and put the polyester material on the twin-rolls to start kneading at 15 r / min after the set temperature is reached.

[0036] S22: In the molten state of the polyester material, slowly and evenly sprinkle the prepared nanoparticles between the double rollers; stop mixing after mixing for 1.5 hours, and cool;

[0037] S3: After cooling, set the speed of the ball mill to 300r / min and use a ball mill to pulverize the temporary plugging agent into temporary plugging agent powder A, and its particle...

Embodiment 2

[0039] In this example, a degradable temporary plugging agent is prepared, and its formula is: 68% polylactate, 27% polyglycolide, and 5% nano-silicon dioxide in terms of mass fraction.

[0040] Its specific preparation method is:

[0041] S1: Preparation of polyester material

[0042] Weigh the polylactate and polyglycolide according to the formula, and mix them uniformly in advance according to the formula.

[0043] S21: Turn on the double-roller kneader, set the temperature to 240° C., and put the polyester material on the double-roller for 1.5 hours at 15 r / min after reaching the set temperature.

[0044] S22: In the molten state of the polyester material, slowly and evenly sprinkle the prepared nanoparticles between the double rollers; stop mixing after mixing for 1.5 hours, and cool;

[0045] S3: After cooling, set the speed of the ball mill to 300r / min and use a ball mill to pulverize the temporary plugging agent into temporary plugging agent powder A, and its particl...

Embodiment 3

[0047] In this example, a degradable temporary plugging agent is prepared, and its formula is: 65% polylactate, 32% polyglycolide, and 3% nanometer silicon dioxide in terms of mass fraction.

[0048] Its specific preparation method is:

[0049] S1: Preparation of polyester material

[0050] Weigh the polylactate and polyglycolide according to the formula, and mix them uniformly in advance according to the formula.

[0051] S21: Turn on the double-roller kneader, set the temperature to 240° C., and put the polyester material on the double-roller for 1.5 hours at 15 r / min after reaching the set temperature.

[0052] S22: In the molten state of the polyester material, slowly and evenly sprinkle the prepared nanoparticles between the double rollers; stop mixing after mixing for 1.5 hours, and cool;

[0053] S3: After cooling, set the speed of the ball mill to 300r / min and use a ball mill to pulverize the temporary plugging agent into temporary plugging agent powder A, and its pa...

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Abstract

The invention discloses a degradable temporary plugging agent and a preparation method and application thereof, and relates to the technical field of oil and gas development. The temporary plugging agent comprises a polyester material and inorganic nanoparticles added into the polyester material, and the addition amount of the inorganic nanoparticles in the polyester material is 1-5%. The invention also discloses a preparation method of the degradable temporary plugging agent. The preparation method comprises the following steps: melting, blending and molding the polyester material and the inorganic nanoparticles to obtain temporary plugging agent particles with the particle size of 286.3-525.7 microns. According to the degradable temporary plugging agent, inorganic nanoparticles are dispersed into a polyester material so that the temporary plugging agent which is high in plugging capacity, quick in plugging removal and free from environmental pollution is formed.

Description

technical field [0001] The invention belongs to the technical field of oil and gas development, and in particular relates to a degradable temporary plugging agent and a preparation method thereof. Background technique [0002] After the water injection wells entered the middle and late stages of development, the comprehensive water cut of the oil field rose, some of the main oil layers were completely watered out, and the relatively low permeability oil layers with high oil saturation were still not produced, which made it more difficult to develop the oil field, and the comprehensive water cut rise rapidly. In order to reduce the water content of the oil well and improve the recovery factor of the oil field, two methods are usually used in the prior art to increase the oil recovery, namely selectively plugging the high permeability zone and directing the development target layer to the low permeability layer. [0003] During the well killing, well washing, acidizing and dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508
CPCC09K8/5086
Inventor 郑存川张太亮黄朵付玉龙唐晓莉
Owner SOUTHWEST PETROLEUM UNIV