Temperature-sensitive and salt-sensitive copolymer gel and preparation method thereof

A technology of copolymer and gel, which is applied in the field of temperature-sensitive and salt-sensitive copolymer gel water shutoff agent and its preparation, which can solve the problem of high-temperature and high-salt oil reservoir plugging, poor temperature and salt resistance of water shutoff agent, and easy flocculation and other problems, to achieve good temperature sensitivity and salt resistance, less damage to the formation, and a simple process

Inactive Publication Date: 2018-03-20
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Another purpose of the present invention is to solve the problem that the existing water blocking agent has poor temperature and salt resistance, is easy to dehydrat

Method used

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  • Temperature-sensitive and salt-sensitive copolymer gel and preparation method thereof
  • Temperature-sensitive and salt-sensitive copolymer gel and preparation method thereof
  • Temperature-sensitive and salt-sensitive copolymer gel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method for preparing a temperature-sensitive salt-sensitive copolymer gel, comprising the following steps:

[0041] (1) Preparation of sulfobetaine monomer SPP: Dissolve 3.2ml of dimethylaminopropyl methacrylamide (DMAPMA) in 20mL of ether, then add 2.15g of 1,3-propane sultone (PS) , the solution was left to stand at room temperature for 16 to 24 hours; the white precipitate obtained after the standstill was collected by filtration, washed three times with acetone, and then dried in vacuum; through two experiments, the target product [3-(methylpropene) was obtained. Amido)propyl]dimethyl(3-thiopropyl)ammonium hydroxide inner salt (SPP).

[0042] (2) Add 36g of starch into a 500ml one-necked flask, and add 360ml of water, and gelatinize in a constant temperature water bath at 75°C under mechanical stirring until it becomes completely transparent.

[0043](3) Add 18g of functional monomer SPP and 18g of acrylamide (AM) to the gelatinized starch to obtain the first rea...

Embodiment 2

[0046] A method for preparing a temperature-sensitive salt-sensitive copolymer gel, comprising the following steps:

[0047] (1) Preparation of sulfobetaine monomer DMAPS: Add 17.27g methacryloxyethyl dimethylamine (DM) and 34.54g acetone and 0.02947g inhibitor (p-hydroxyanisole) into 250ml three ports In the flask; dropwise add the mixed solution of 12.2g 1,3-propyl sultone (PS) and 12.2g acetone, the dropwise addition is completed within 2 hours, and reflux reaction at 55°C for 20 hours. After the reaction is completed, there is A large number of white crystals were precipitated and filtered; the filter cake was repeatedly washed with a large amount of acetone and ether mixture, and dried in vacuum at 65°C until the mass was constant to obtain monomer DMAPS.

[0048] (2) Add 24g of starch into a 500ml one-necked flask, and add 360ml of water, and gelatinize in a constant temperature water bath at 75°C under mechanical stirring until it becomes completely transparent.

[004...

Embodiment 3

[0052] A method for preparing a temperature-sensitive salt-sensitive copolymer gel, comprising the following steps:

[0053] (1) Add 24g of starch into a 500ml one-necked flask, and add 360ml of water, and gelatinize in a constant temperature water bath at 75°C under mechanical stirring until it becomes completely transparent.

[0054] (2) Add 12g functional monomer octadecylethoxy sulfobetaine and 12g acrylamide (AM) to the gelatinized starch to obtain the first reaction solution; then add 0.24g Stir the cross-linking agent N,N-methylenebisacrylamide and 0.12 g of the initiator ammonium persulfate evenly, seal the reaction container with a plastic wrap, and put it in a 60°C oven for 24-36 hours to obtain a crude gel.

[0055] (3) The coarse gel is cut into small pieces with scissors, then soaked in pure water and stirred for 12 hours, and the water is changed at 1 hour, 2 hours, 4 hours, 6 hours, and 12 hours, so that the unreacted polymer gel can be removed. monomers and wa...

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Abstract

The invention discloses a temperature-sensitive and salt-sensitive copolymer gel. The temperature-sensitive and salt-sensitive copolymer gel is prepared from the following raw materials of acrylamide,functional monomers and starch through crosslinking and polymerizing. The temperature-sensitive and salt-sensitive copolymer gel is prepared by the following steps of (1) adding the starch into water, stirring, and pasting to the complete transparent state in a 75-DEG C constant-temperature water bath pot, so as to obtain a starch water solution; (2) adding the acrylamide and the functional monomers into the starch water solution, so as to obtain a first reaction solution; (3) adding a crosslinking agent and a free radical initiator into the first reaction solution, uniformly stirring, sealing a reaction container, and reacting for 24 to 36h at the temperature of 60 to 70 DEG C, so as to obtain a crude gel; (4) adding the crude gel into pure water, soaking and stirring for 12h, and drying, so as to obtain the temperature-sensitive and salt-sensitive copolymer gel. The synthesized temperature-sensitive and salt-sensitive copolymer gel has the characteristics that the temperature-sensitive and salt-sensitive properties with high expansion rate at high temperature and high salt condition are realized, and the like; by using the starch as a substrate for grafting and copolymerizing, the degradability of the gel is realized; the damage to stratum is little, the environment-friendly effect is realized, and the modern green development value is met.

Description

technical field [0001] The patent belongs to the field of petroleum exploitation, and specifically relates to a temperature-sensitive salt-sensitive copolymer gel water blocking agent and a preparation method thereof. Background technique [0002] Oilfield development generally enters the high water cut stage in the middle and late stages. Due to the original heterogeneity of the reservoir formation and the long-term water flooding, the heterogeneity is further aggravated. The injected water mainly flows into the high permeability zone, forming a water flow dominant channel, thereby reducing Sweep efficiency of injected water. Using cross-linked polymer gel to control the profile control and water shutoff of the dominant water flow channel to improve the sweep efficiency of water flooding and oil recovery is currently the most widely used profile control water shutoff and deep water flow diversion technology at home and abroad. The cross-linked gel involved in this technolo...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/56C08F220/34C08F220/60C08F222/38C08F230/06C09K8/512
CPCC08F251/00C09K8/512C08F220/56C08F220/34C08F220/60C08F230/06
Inventor 薛艳张波王新勇鹿嘉悦叶仲斌
Owner SOUTHWEST PETROLEUM UNIV
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