Preparation method for compound particle temporary plugging agent

A technology of composite particles and temporary plugging agent, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of no longer applicable, slow flowback, and reduced effect of plugging cracks, etc. effect of benefit

Inactive Publication Date: 2019-01-01
LANZHOU UNIVERSITY OF TECHNOLOGY
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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, th

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  • Preparation method for compound particle temporary plugging agent
  • Preparation method for compound particle temporary plugging agent
  • Preparation method for compound particle temporary plugging agent

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Embodiment Construction

[0017] The present invention will be described in detail below in combination with specific embodiments.

[0018] Dissolve potassium persulfate particles in 15ml of water, dissolve flake NaOH in 20ml of water, dilute acrylic acid with 10ml of water, put the beaker containing acrylic acid into the ice-water mixture and add the NaON solution drop by drop to the acrylic acid (dissolving NaOH exothermic , when the temperature is higher than 40 ° C, acrylic acid can self-polymerize, which can prevent its self-polymerization), forming a partially neutralized acrylic acid solution. The dissolution time reaches the maximum when the molar ratio of neutralized acrylic acid to acrylamide is 1:1. Considering the construction conditions and process conditions, it is most suitable when the molar ratio of partially neutralized acrylic acid to acrylamide is 1:1.

[0019] Then raise the temperature of the water bath to 75°C, and add 6g of acrylamide (AM), sodium alginate with 6% weight of acry...

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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...

Claims

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Application Information

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IPC IPC(8): C09K8/508C09K8/516C08F251/00C08F220/06C08F220/56
CPCC08F251/00C09K8/514C09K8/516
Inventor 张定军包亮军吴颜飞朱金龙秦冉马应霞陈振斌
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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