Temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel

A technology of temperature and salt resistance and hydrogel, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor thermal salt stability, less profitable on-site operation, etc., and achieves low initial viscosity and pumpability. Good, high gel strength effect
CN104449618AActive Publication Date: 2015-03-25成都西南石大石油工程技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
成都西南石大石油工程技术有限公司
Publication Date
2015-03-25

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Abstract

The invention discloses temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel which mainly consists of, by mass, main agent 4%-6%, cross-linking agent 1%-2% and the balance saline water. The main agent consists of a monomer A and a monomer B, wherein the monomer A is acrylamide, and the monomer B is ester matter. The cross-linking agent is one of or a mixture of two or more formaldehyde, phenolic resin, resorcinol, hexamethylene tetramine, paraformaldehyde and polyethyleneimine. The temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel spontaneously produces cross-linking polymerization under the condition of high temperature, an initiator is not added, the gelling time can be controlled to be 2 hours to 28 hours at the temperature of 120 DEG C, the water plugging gel can be directly prepared by high-salinity water, the gelling strength can be up to the visual inspection code level I, and synaeresis does not occur after 90 days. The temperature-resisting salt-tolerant high-temperature self-cross-linking onsite polymerization water plugging gel is low in initial viscosity, has the advantages of being few in components, good in instant solubility and pumping injection performance, high plugging strength, good in thermohaline stability, low in cost and the like and has wide application prospect on the aspect of high-temperature high-salinity oil reservoir profile control water plugging.
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Description

technical field

[0001] The invention relates to a temperature-resistant, salt-resistant, high-temperature self-crosslinking in-situ polymerized water-plugging gel that can be used for water plugging in oil wells in high-temperature and high-salt reservoirs, profile control of water injection wells, and improvement of water injection pressure, and belongs to the oil field in the tertiary oil recovery technology chemical field. Background technique

[0002] Using chemical profile control and water shutoff technology to carry out profile control of water injection wells or water shutoff of oil wells can achieve the goals of "controlling water and stabilizing oil" and "controlling water and increasing oil production" to a certain extent. The in-situ polymerization bulk gel formed by acrylamide and temperature-resistant and salt-resistant functional monomers plus cross-linking agents and other additives has been widely used in chemical profile control and water shutoff technology...

Claims

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