Retarded crosslinking deep profile control agent and preparation method thereof

A technology of deep profile modification and hydrophobic association, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of limited ability to delay crosslinking, and achieve simple preparation methods, suitable for large-scale industrial production and Effect of application and delay of gelation time

Active Publication Date: 2014-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its ability to delay cross-linking is very limited, and it is not suitable for deep profile control in high-permeability reservoirs, large pores and fractures, etc.

Method used

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  • Retarded crosslinking deep profile control agent and preparation method thereof
  • Retarded crosslinking deep profile control agent and preparation method thereof
  • Retarded crosslinking deep profile control agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]The delayed cross-linking deep profile control agent in this example is composed of the following components: 0.4 g of hydrophobically associated polyacrylamide, 0.5 g of β-cyclodextrin / phenol inclusion compound, 0.4 g of urotropine, and 0.15 g of citric acid g, the solvent is 100mL deionized water.

[0045] The preparation method of the delayed cross-linking deep profile control agent in this example includes the following steps: accurately take each component, first dissolve the hydrophobic association polyacrylamide in deionized water, and then add urotropine, citric acid, and cyclohexidine in sequence. Dextrin / phenol clathrate, stir and dissolve evenly.

[0046] The preparation method of described hydrophobic association polyacrylamide is:

[0047] (1) Preparation of hydrophobic monomer (octyl polyoxyethylene ether acrylate): add octylphenol polyoxyethylene ether (OP-20) into a 250mL three-necked flask equipped with a mechanical stirrer, oil-water separator, and ref...

Embodiment 2

[0052] The delayed cross-linking deep profile control agent in this example is composed of the following components: 0.5 g of hydrophobically associated polyacrylamide, 0.5 g of β-cyclodextrin / phenol clathrate, 0.2 g of urotropine, and 0.2 g of citric acid g, the solvent is 100mL deionized water.

[0053] The preparation method of described hydrophobic association polyacrylamide is:

[0054] (1) Preparation of hydrophobic monomer (octyl polyoxyethylene ether acrylate): add octylphenol polyoxyethylene ether (OP-15) into a 250mL three-necked flask equipped with a mechanical stirrer, oil-water separator, and reflux condenser 100g and 100mL of toluene, heated and refluxed to separate the water until no water beads hang on the wall of the flask; then the reaction solution was cooled to 50°C, and then 10g of acrylic acid, 0.5g of catalyst p-toluenesulfonic acid and 0.05g of inhibitor hydroquinone were added In the flask, heat to reflux to separate water for 12 hours, cool to room t...

Embodiment 3

[0059] The delayed cross-linking deep profile control agent in this example is composed of the following components: 0.8 g of hydrophobically associated polyacrylamide, 0.8 g of β-cyclodextrin / phenol inclusion compound, 0.5 g of urotropine, and 0.4 g of citric acid g, the solvent is 100mL deionized water.

[0060] The preparation method of described hydrophobic association polyacrylamide is:

[0061] (1) Preparation of hydrophobic monomer (octyl polyoxyethylene ether acrylate): add octylphenol polyoxyethylene ether (OP-13) into a 250mL three-necked flask equipped with a mechanical stirrer, oil-water separator, and reflux condenser 100g and 100mL of toluene, heat and reflux to separate the water until no water beads hang on the wall of the flask; then cool the reaction solution to 70°C, then add 10g of acrylic acid, 0.1g of catalyst p-toluenesulfonic acid and 0.01g of polymerization inhibitor hydroquinone In the flask, heat to reflux to separate water for 6 hours, cool to room...

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Abstract

The invention discloses a retarded crosslinking deep profile control agent and a preparation method thereof, and belongs to the technical field of oilfield chemistry. The deep profile control agent is prepared from the following components by mass concentration: 0.1-1.0% of hydrophobically associating polyacrylamide, 0.1-1.0% of cyclodextrin / phenol clathrate, 0.1-0.5% of urotropine, 0.1-0.4% of citric acid, and water serving as a solvent. Hydrophobically associating polyacrylamide is novel water-soluble polyacrylamide, and has critical association concentration; when the concentration of a polymer is greater than the critical association concentration, a hydrophobic group generates intermolecular association, so that the viscosity of the solution is greatly increased and the solution displays good performances such as temperature resistance, salt resistance, shearing resistance and the like. Phenol is slowly released by the competitive clathration of the hydrophobic group in hydrophobically associating polyacrylamide on phenol, so that the gelation time can be effectively retarded; meanwhile, the gelation time can be regulated and controlled, so that deep profile control is selectively carried out on high-permeability reservoirs, large ducts, cracks and the like.

Description

technical field [0001] The invention specifically relates to a delayed cross-linking deep profile control agent and a preparation method of the profile control agent, belonging to the technical field of oil field chemistry. Background technique [0002] In the profile control technology of oil and water wells at home and abroad, the polymer cross-linking gel technology is generally concerned, that is, the polymer solution and the cross-linking agent are mixed on the ground to prepare a single-liquid profile control working fluid and injected into the deep formation in a large dose. Under certain conditions, the polymer and the cross-linking agent are slowly cross-linked to form a polymer gel with a network structure, so as to block the high-permeability and high-permeability layers and large pores. [0003] The main components of gel profile control system are polymer and crosslinking agent. The commonly used polymers are xanthan gum and polyacrylamide. One type of crossli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44
CPCC08B37/0015C08F290/062C08F2800/10C08G65/48C08G2650/04C09K8/512C08F220/56C08F220/06
Inventor 徐斌杨欢张永刚魏开鹏斯容刘学全卢榆林刘岳龙
Owner CHINA PETROLEUM & CHEM CORP
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