Preparation method of high strength elastic slow-expansion water-absorption particle diverting agent

A technology of water-absorbing particles and diverting agents, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of fast water-absorbing expansion, difficult placement in deep parts, low strength and easy breakage, etc., and achieves good deep placement effect.

Active Publication Date: 2010-06-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to improve the disadvantages of conventional body swelling particles, such as too fast water absorption and expansion, low strength after body swelling, easy to break, and difficulty in deep placement.

Method used

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  • Preparation method of high strength elastic slow-expansion water-absorption particle diverting agent
  • Preparation method of high strength elastic slow-expansion water-absorption particle diverting agent
  • Preparation method of high strength elastic slow-expansion water-absorption particle diverting agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 39.47g of water, 10g of acrylamide, 0.5g of hydrogen peroxide and ammonium persulfate, 0.03g of methylenebisacrylamide, and 50g of natural rubber were successively added to a 250mL reaction vessel under stirring; the reaction vessel was sealed in the React at 80°C for 3 hours to obtain a solid gelatinous product, and vacuum dry to obtain an intermediate product.

[0024] By kneading, 3 g of sulfur, 1 g of stearic acid, 5 g of zinc oxide, and 1.2 g of 2-mercaptobenzothiazole were added to 100 g of the intermediate. It is vulcanized at 140°C and 14MPa, and the product is pulverized to obtain slow-swelling and high-strength water-absorbing granular materials.

Embodiment 2

[0026] 49.25g of water, 15g of acrylic acid and sodium acrylate, 0.7g of ammonium persulfate and potassium persulfate, 0.05g of methylenebisacrylamide, and 35g of natural rubber latex were successively added to a 250mL reaction vessel with stirring; Sealed and reacted at 60°C for 8 hours to obtain a solid gel block product, and vacuum dried to obtain an intermediate product.

[0027] By kneading, 2.8 g of sulfur, 0.7 g of stearic acid, 4.5 g of zinc oxide, and 1.0 g of 2-mercaptobenzothiazole were added to 100 g of the intermediate. Vulcanize at 143°C, 15MPa, and pulverize the product to obtain slow-swelling and high-strength water-absorbing granular materials

Embodiment 3

[0029] Add 37.9g ​​of water, 10g of acrylonitrile and methyl methacrylate, 1.0g of sodium sulfite and ammonium bisulfite, 0.1g of methylenebisacrylamide, 50g of natural latex, and 1.0g of ferricyanide in a 250mL reaction vessel while stirring. Potassium; after purging nitrogen to remove oxygen, seal the reaction vessel and react at 40° C. for 24 hours to obtain a solid gelatinous product, and vacuum-dry to obtain an intermediate product.

[0030] By kneading, 2.5 g of sulfur, 0.3 g of stearic acid, 3 g of zinc oxide, and 0.7 g of 2-mercaptobenzothiazole were added to 100 g of the intermediate. Vulcanize at 145°C and 15MPa, and after pulverizing the product, it can obtain slow swelling and high strength water absorption

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Abstract

The invention relates to a preparation method of a high strength elastic slow-expansion water-absorption particle diverting agent, comprising the following steps of: according to the total mass of 100 percent, weighing 10-20 percent of monomer, 0.5-1percent of initiator, 0.01-0.1percent of crosslinker, 30-50 percent of natural rubber or/and 0.1-1.0 of speed control agent and the balance of water, generating the cross-linking polymerization reaction at the temperature of 40-80 DEG C to form a water absorption mesh and obtain an intermediate product; according to the intermediate product mass of 100 percent, adding 2.5-3 percent of sulfur, 0.5-1 percent of stearic acid, 3-5 percent of zinc oxide and 0.7-1.2 percent of thiol benzothiazole, and vulcanizing rubber by a mixing way at 140-145 DEG C and 14-15MPa to form a framework mesh, wherein within the range of room temperature to 80 DEG C, the framework mesh can absorb 5-30 times of water, slowly expands for 3-30 days, and needs two to three months for the complete expansion; and after water absorption, the framework mesh has the strength more than 20kPa. The diverting agent good depth arrangement, deformation and plugging capability.

Description

technical field [0001] The invention relates to a preparation method of a high-strength elastic slow-swelling water-absorbing particle diverting agent, which can be used to divert liquid flow deep in high water-cut oilfields, improve the displacement effects of water flooding, polymer flooding, surfactant flooding, and composite flooding, and improve oil reservoir recovery. yield. Background technique [0002] Water flooding is the main production method of most oilfields in my country, and profile control is one of the important technical means to improve water flooding and enhance oil recovery. In the early stage of development, the profile control of water injection wells has a significant effect of increasing oil production and reducing water content. However, as long-term water injection oilfields generally enter the late stage of high water cut development, there are generally dominant water flow channels in the formation, resulting in ineffective injection or ineffici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C08F253/00C08J3/24C08L51/04C08K13/02
Inventor 唐孝芬魏发林马涛刘玉章熊春明
Owner PETROCHINA CO LTD
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