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Temperature-sensitive delayed type water shutoff agent as well as preparation method and application thereof

A delay-type, water-blocking agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as poor stability, poor toughness, formation damage, etc., to achieve stable water-blocking performance, fast gelation, and formation The effect of high viscosity

Active Publication Date: 2021-09-10
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the peracid solution introduced by the above method is easy to cause damage to the formation; and the silica gel in the silica gel-polyacrylamide composite gel does not participate in the polymerization reaction of polyacrylamide, so the toughness and stability of the gel are poor.

Method used

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  • Temperature-sensitive delayed type water shutoff agent as well as preparation method and application thereof
  • Temperature-sensitive delayed type water shutoff agent as well as preparation method and application thereof
  • Temperature-sensitive delayed type water shutoff agent as well as preparation method and application thereof

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preparation example Construction

[0042] The invention provides a method for preparing a temperature-sensitive delayed water blocking agent, the preparation method comprising the following steps:

[0043] (1) Add acrylamide monomers, acrylic monomers, cationic monomers, temperature-sensitive delayed crosslinking agents, organic solvents, anti-salt and anti-shear agents, and defoamers in sequence to deionized water and stir to obtain The first reaction solution; wherein, the temperature of the first reaction solution is controlled to be 5-6°C;

[0044] (2) Adding the first initiator, chelating agent and molecular weight regulator to the first reaction solution in sequence, stirring and mixing evenly, and then introducing nitrogen gas, and then adding the first reducing agent solution to initiate the polymerization reaction to obtain the first product solution ; Wherein, the reaction temperature of the polymerization reaction is 20-25°C;

[0045] (3) Temperature-sensitive compatible cross-linking agent, diluent...

Embodiment 1

[0098] Preparation method of temperature-sensitive delayed water blocking agent:

[0099] (1) Mix 81g of acrylamide monomer (acrylamide), 38g of acrylic acid monomer (acrylic acid), 23g of cationic monomer (dimethyl diallyl ammonium chloride), 18g of temperature-sensitive delayed crosslinking agent (methacrylic acid) Base-1-oleyl amidoethyl-2-oleyl imidazoline methyl sulfate ammonium), 39g organic solvent (ethylene glycol), 5.2g anti-salt and anti-shear agent (1-allyl-4-bromo-2 - toluene) and 6.8g defoamer (tributyl phosphate) were added to 256g deionized water successively and stirred and mixed at a rotating speed of 250r / min to obtain the first reaction solution, and the temperature of the first reaction solution was controlled as 5°C;

[0100] (2) Add 0.061g of the first initiator (dicumyl hydroperoxide), 0.057g of the chelating agent (diethylenetriaminepentaacetic acid) and 0.022g of the molecular weight regulator (ethylene Glycol dimethyl ether) and stirred and mixed at...

Embodiment 2

[0105] Preparation method of temperature-sensitive delayed water blocking agent:

[0106] (1) Mix 90g of acrylamide monomer (acrylamide), 35g of acrylic acid monomer (acrylic acid), 15g of cationic monomer (dimethyl diallyl ammonium chloride), 28g of temperature sensitive delayed crosslinking agent (15g Allyloxynonylphenol polyoxyethylene ether ammonium sulfate and 13g methyl-1-oleylamide ethyl-2-oleyl imidazole), 41g organic solvent (ethylene glycol), 8g anti-salt and anti-shear agent ( N-vinylpyrrolidone) and 10g of antifoaming agent (polyoxypropylene polyoxyethylene propylene glycol ether) were sequentially added to 227g of deionized water and stirred at a speed of 250r / min to obtain the first reaction solution, and the first The temperature of the reaction solution is controlled at 5°C;

[0107] (2) Add 0.071g of the first initiator (sodium persulfate), 0.076g of the chelating agent (ethylenediamine tetramethylene phosphonic acid) and 0.016g of the molecular weight regula...

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Abstract

The invention relates to the technical field of oil exploitation, and in particular, relates to a temperature-sensitive delayed type water shutoff agent and a preparation method and application thereof. The method comprises the steps: sequentially adding an acrylamide monomer, an acrylic monomer, a cationic monomer, a temperature-sensitive delayed type cross-linking agent and the like into deionized water, uniformly stirring and mixing, and initiating a polymerization reaction at the temperature of 5-6 DEG C to obtain a first product solution; and sequentially adding a temperature-sensitive compatible cross-linking agent, a diluent, a pore-foaming agent, an acrylamide monomer, an acrylic monomer, a cationic monomer, a temperature-sensitive delayed type cross-linking agent and the like into deionized water, stirring and uniformly mixing, then adding into the first product solution, stirring and uniformly mixing, and initiating a polymerization reaction at the temperature of 20-25 DEG C to obtain the temperature-sensitive delayed type water shutoff agent. The temperature-sensitive delayed type water shutoff agent prepared by the method has the characteristics of convenience in injection, high-temperature self-gelatinization, high gelatinization speed and high gelatinization viscosity.

Description

technical field [0001] The invention relates to the technical field of polymer polymerization, in particular to a temperature-sensitive delayed water shutoff agent and its preparation method and application, which can be applied in the technical field of petroleum exploitation. Background technique [0002] During the water injection development of the oilfield, the long-term scouring of the oil layer by the injected water will gradually form high-permeability channels or large pores, which will make the formation pressure field and streamline field form a fixed position, resulting in the formation of water-flow dominant channels between oil and water wells, resulting in "Water flooding" is short-circuited; and due to fracturing, artificial fractures have become more obvious channels for water flow, resulting in ineffective circulation of injected water. In order to expand the swept volume of water injection, improve the effect of water flooding in oil and oil field exploita...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F226/02C08F216/14C08F220/60C08F4/40C09K8/512C09K8/88
CPCC08F220/56C08F4/40C09K8/512C09K8/5083C09K8/887C09K8/882C08F220/06C08F226/02C08F220/606C08F216/1491C08F220/603
Inventor 荣敏杰郭奇许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH