A kind of multinuclear microsphere selective water blocking agent and preparation method thereof

A water blocking agent and selective technology, applied in the field of multi-core microsphere selective water blocking agent and its preparation, can solve the problems of poor plugging effect in high permeability formations

Active Publication Date: 2021-07-06
SICHUAN JIEBEITONG ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new type of multi-nuclear microsphere selective water shutoff agent suitable for high permeability formations in view of the shortcomings of existing polymer water shutoff agents that have poor plugging effects on high permeability formations

Method used

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  • A kind of multinuclear microsphere selective water blocking agent and preparation method thereof
  • A kind of multinuclear microsphere selective water blocking agent and preparation method thereof
  • A kind of multinuclear microsphere selective water blocking agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] In a 500 ml reaction flask, replace the air with nitrogen, then add 60 grams of L-lactide, 40 grams of aspartic acid, 30 grams of 2-ethyl-2-oxazoline, and 70 grams of dimethyl carbonate into the reaction flask and heat up to 120°C, start the stirrer, then add 0.08 g of stannous valerate catalyst and 0.5 g of potassium hydroxide, and gradually raise the temperature of the reaction liquid system to 150°C for constant temperature reaction for 8 hours, and cool the obtained product after the reaction is completed After cooling, a solid phase product is obtained, and the product is crushed by a pulverizer to obtain a powder with a particle size of 100-200 mesh, which is the water blocking agent.

[0021] The water shutoff agent synthesized by the method is suitable for water shutoff construction of oil and gas wells below 90°C.

Embodiment 2

[0023] In a 500ml reaction flask, replace the air with nitrogen, then add 80 grams of L-lactide, 50 grams of aspartic acid, 40 grams of 2-ethyl-2-oxazoline, and 30 grams of dimethyl carbonate into the reaction flask and heat up to 120°C, start the stirrer, then add 0.1 g of stannous valerate catalyst and 0.6 g of potassium hydroxide, and gradually raise the temperature of the reaction liquid system to 150°C for constant temperature reaction for 8 hours, and cool the obtained product after the reaction is completed. After cooling, a solid phase product is obtained, and the product is crushed by a pulverizer to obtain a powder with a particle size of 100-200 mesh, which is the water blocking agent.

[0024] The water shutoff agent synthesized by the method is suitable for water shutoff construction of oil and gas wells at 90-150°C.

Embodiment 3

[0026] In a 500ml reaction flask, replace the air with nitrogen, then add 80 grams of L-lactide, 50 grams of aspartic acid, 40 grams of 2-ethyl-2-oxazoline, and 30 grams of dimethyl carbonate into the reaction flask and heat up to 130°C, start the stirrer, then add 0.1 gram of stannous valerate catalyst and 0.6 gram of potassium hydroxide, and gradually heat up the reaction liquid system to 140°C for constant temperature reaction for 10 hours, and cool the obtained product after the reaction is completed. After cooling, a solid phase product is obtained, and the product is crushed by a pulverizer to obtain particles with a particle size of 1-8 mm, which is the water blocking agent.

[0027] The water shutoff agent synthesized by the method is suitable for water shutoff construction of oil and gas wells at 90-150°C.

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Abstract

The invention discloses a multi-nuclear microsphere selective water blocking agent, which is made of the following raw material components: L-lactide, aspartic acid, 2-ethyl-2-oxazoline, dicarbonate Methyl esters, catalysts and pH regulators. The preparation method of the water blocking agent comprises the steps of: step 1, passing nitrogen into the reaction vessel to replace the air, and then adding L-lactide, aspartic acid, 2-ethyl-2-azole to the reaction vessel phenoline, dimethyl carbonate, stirring evenly; Step 2, heating the reaction solution to 110-130°C, adding catalyst and regulator, adjusting the pH value of the reaction solution to neutral, and then raising the temperature to 140-160°C for constant temperature reaction for 8-10h , cooling; step 3, processing the cooled product into granules or powder, which is the water shutoff agent. The water blocking agent of the present invention has the characteristics of "swelling with water and shrinking with oil". After being injected into the formation, it can form a colloid when it meets water, and then play a role in water blocking; Non-clogging, selective.

Description

technical field [0001] The invention relates to the technical field of increasing production in oil and gas fields, in particular to a multi-core microsphere selective water shutoff agent and a preparation method thereof. Background technique [0002] During the development of oil and gas fields, the original natural fractures and karst caves in the formation, the artificially induced fractures in the development process, the strong production and strong injection cause formation sand, a large loss of cement, and the destruction of the cemented structure, all of which lead to high permeability in the formation. The water content of oil-generating wells will rise sharply, the production will drop rapidly, the workload of water treatment will increase, the recovery degree of oil reservoirs will be low, and even water-flooded wells will appear, the production costs will increase significantly, and the economic benefits will decline significantly. Plugging high permeability form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/508
Inventor 徐太平李栓周京伟袁发明
Owner SICHUAN JIEBEITONG ENERGY TECH CO LTD
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