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Preparation method of high-temperature resistance multilayer precoated sand

A technology of coated sand and high temperature resistance, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of easy falling off, affecting the comprehensive development effect of oil and gas fields, poor application effect, etc., and achieve the effect of satisfying one-time sand control.

Inactive Publication Date: 2014-07-09
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the coating material on the surface of quartz sand is easy to fall off during packaging, storage, transportation, and construction. During the sand control construction, the sand-carrying liquid is in direct contact with the coating material on the surface of the quartz sand, which affects the cementation performance of the coated sand and the conductivity after cementation. At the same time, due to the relatively poor temperature resistance of the coating materials used, the application effect of conventional coated sands on heavy oil thermal recovery wells is poor, resulting in a short sand control effect of conventional coated sands, which affects the comprehensive development of oil and gas fields. Effect

Method used

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  • Preparation method of high-temperature resistance multilayer precoated sand

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Effect test

Embodiment 1

[0027] The preparation method of the high temperature resistant multi-layer film is carried out as follows:

[0028] a. Heat the sieved quartz sand or ceramsite with a particle size of 0.3-0.6mm to 150°C in a high-temperature furnace and put it into the first-stage sand mixer. Methylenetetramine=100:8:10 parts by weight, first spray into the coating material, after stirring for 20s, then add hexamethylenetetramine, and continue stirring for 90s to obtain pre-cured coated quartz sand or ceramsite; The coating material is a modified phenolic resin prepared by reacting 3 parts by weight of organosilicon, 8 parts by weight of coal tar and 95 parts by weight of thermoplastic phenolic resin at a temperature of 75° C. for 5 hours;

[0029] b. Put the pre-cured coated quartz sand or ceramsite in step a into the secondary sand mixer and heat it to 180°C, and stir according to the pre-cured coated quartz sand or ceramsite: unsaturated resin: silicone: six times Methyltetramine=100:9:2:...

Embodiment 2

[0032] The preparation method of the high temperature resistant multi-layer film is carried out as follows:

[0033] a. Heat the sieved quartz sand or ceramsite with a particle size of 0.3-0.6mm to 180°C in a high-temperature furnace and put it into the first-stage sand mixer. Methylenetetramine=100:6:12 parts by weight, first spray into the coating material, stir for 10s, then add hexamethylenetetramine, and continue stirring for 240s to obtain pre-cured coated quartz sand or ceramsite; The coating material is a modified phenolic resin prepared by reacting 1 weight part of organic silicon, 12 weight parts of coal tar and 85 weight parts of thermoplastic phenolic resin at a temperature of 85° C. for 4 hours;

[0034] b. Put the pre-cured coated quartz sand or ceramsite in step a into the secondary sand mixer and heat it to 150°C, and stir according to the pre-cured coated quartz sand or ceramsite: unsaturated resin: silicone: six times Methyltetramine=100:7:3:2 parts by weigh...

Embodiment 3

[0037] The preparation method of the high temperature resistant multi-layer film is carried out as follows:

[0038] a. Heat the sieved quartz sand or ceramsite with a particle size of 0.3-0.6mm to 160°C in a high-temperature furnace and put it into the first-stage sand mixer. Methylenetetramine=100:7:11 parts by weight, first spray into the coating material, stir for 15s, then add hexamethylenetetramine, and continue stirring for 160s to obtain pre-cured coated quartz sand or ceramsite; The coating material is a modified phenolic resin prepared by reacting 2 parts by weight of organosilicon, 10 parts by weight of coal tar and 90 parts by weight of thermoplastic phenolic resin at a temperature of 80° C. for 4.5 hours;

[0039]b. Put the pre-cured coated quartz sand or ceramsite in step a into the secondary sand mixer and heat it to 170°C, and stir according to the pre-cured coated quartz sand or ceramsite: unsaturated resin: silicone: six times Methyltetramine=100:8:2.5:3 par...

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Abstract

The invention provides a preparation method of a high-temperature resistance multilayer precoated sand, which comprises the following steps: a)heating screened quartz sand or ceramsite in a high-temperature furnace to 150-180 DEG C and then placing in a first-grade sand mixer, injecting a coated material while stirring, adding a curing agent after stirring for 10-20 seconds, continuously stirring for 90-240 seconds to obtain the precured coated quartz sand or ceramsite; b)placing the precured quartz sand or ceramsite in the step a) in a secondary sand mixer for heating to the temperature of 150-180 DEG C, injecting nonsaturated resin, organosilicon and the curing agent while stirring, stirring for 40-140 seconds to obtain the solidifiable coated quartz sand or ceramsite; and c)cooling the solidifiable coated quartz sand or ceramsite in the step b) to the temperature of 100-110 DEG C and placing in a third-grade sand mixer, adding calcium stearate with inertia resin weight of 5-7%, and uniformly stirring to obtain the product for warehousing.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field fracturing transformation, and more specifically, belongs to a method for preparing high-temperature-resistant multi-layer coated sand. Background technique [0002] Coated sand is coated with a layer of coating material that can be cemented under formation temperature and pressure on the surface of quartz sand or ceramsite. The coated sand has high strength and good conductivity after cementation, so it is widely used It is used in fields such as oil and gas field fracturing reconstruction, unconsolidated sandstone reservoir sand control, etc. Coated sand is mainly used as a trailing sealant in the fracturing reconstruction of oil and gas fields, the purpose is to prevent the fracturing sand from returning after fracturing and affecting the fracturing effect. As the most widely used product for sand control in unconsolidated sandstone reservoirs, coated sand has made an important contr...

Claims

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Application Information

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IPC IPC(8): C04B26/02C04B26/12C09K8/62
Inventor 智勤功李鹏孙磉礅陈刚武明鸣魏芳张锡娟魏庆彩马丁王东高雪峰
Owner CHINA PETROLEUM & CHEM CORP
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