Preparation method for compound particle temporary plugging agent

Abstract

The invention discloses a preparation method for a compound particle temporary plugging agent. The preparation method comprises the following steps: dissolving potassium peroxodisulfate particles andNaOH in water, diluting acrylic acid with water, putting acrylic acid into an ice water mixed solution and dropwise adding the NaOH solution into acrylic acid, thereby obtaining a locally neutralizedacrylic acid solution; rising the temperature of a water bath kettle, adding acrylamide solution, sodium alginate, dissolved potassium peroxodisulfate solution and water into a three-port flask containing a stirrer, a refluxing condensing unit and a thermometer, and then reacting; putting the product into a constant temperature drying oven, baking till reaching constant weight, smashing into powder and then adding aluminum nitrate powder and starch, uniformly mixing, adding water and kneading into microspheres; scattering a small amount of light calcium carbonate onto the microspheres, preventing the microspheres from bonding, putting into an air blowing drying oven and drying till reaching constant weight. The preparation method disclosed by the invention has the beneficial effect that the prepared compound material temporary plugging agent microsphere is capable of achieving an expected effect, has the effects of plugging measures and is capable of improving the exploitation benefitsof oil fields.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to sodium alginate and polyacrylamide / acrylic acid polymer composite material microspheres with a particle size of 3-5 mm and good solubility properties. Background technique [0002] Temporary plugging agent is a chemical agent with a temporary plugging effect. It enters the formation and can block the gel after a period of time under the formation conditions. It can effectively inhibit the formation of gel in low-permeability formations, but its strength cannot effectively plug In the high permeability layer, the temporary plugging agent and self-gel breaking fluid can effectively restore the permeability of the low permeability layer within a certain period of time. [0003] Traditional production technology can only produce one-third of the original reserves of the oil reservoir, and the remaining two-thirds are used as research targets for enhanced oil recovery (EO...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of preparation method of composite granular temporary plugging agent, solves the problem that because most oilfields in China have entered the middle and high water-cut development period at present, the effect of oil-soluble temporary plugging agent with good application effect to plug the cracks has declined, The plugging time becomes longer and the flowback speed becomes slower, which is no longer applicable to high water cut oil wells and water injection wells

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