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Inter-slit temporary plugging agent and preparation method thereof

A temporary plugging agent and inter-fracture technology, used in chemical instruments and methods, drilling compositions, etc., can solve the problems of residue, poor plugging effect, high cost, etc., and achieve low cost, high plugging efficiency, Strong blocking effect

Inactive Publication Date: 2016-07-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The one type of auxiliary agent that plays a decisive role in this technology is the temporary plugging agent, but most of the commonly used temporary plugging agents are suitable for temporary plugging in medium and low temperature formations, which have problems such as high cost, poor plugging effect, and residues after dissolution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 14g of acrylamide, 18g of natural polyurethane, 2.95g of sulfonate surfactant and 4g of urea into a jar, add 38.95g of water, protect it with nitrogen, put it in a constant temperature water bath at 60°C to preheat and stir for 1 hour; then Take 0.84g of potassium persulfate, 0.14g of isomeric alcohol, and 0.07g of aluminum chloride and add them into a jar, add 1.05g of water, seal it, and pass nitrogen protection. After the reaction is complete (that is, the viscosity of the product rises to the shape of an immobile rubber sheet), take it out, cool to room temperature, and stop the reaction.

[0015] The product was taken out and placed in an oven, and dried at 35°C for 72h. After crushing, sieve to obtain black solid granular temporary plugging agent products with different particle sizes such as 1-3mm and 5-8mm.

[0016] Solubility experiments and plugging performance tests were carried out on the temporary plugging agent prepared by the above method to evaluat...

Embodiment 2

[0026] Take 16g of acrylamide, 16g of natural polyurethane, 2.8g of sulfonate surfactant and 4g of urea into a jar, add 38.8g of water, protect it with nitrogen, put it in a constant temperature water bath at 60°C, preheat and stir for 1 hour; then Take 0.96g of potassium persulfate, 0.16g of isomeric alcohol, and 0.08g of aluminum chloride and add them into a jar, add 1.2g of water, seal it, and pass nitrogen protection. After the reaction is complete (that is, the viscosity of the product rises to the shape of an immobile rubber sheet), take it out, cool to room temperature, and stop the reaction.

[0027] The product was taken out and placed in an oven, and dried at 35°C for 72h. After crushing, sieve to obtain black solid granular temporary plugging agent products with different particle sizes such as 1-3mm and 5-8mm.

[0028] The temporary plugging agent prepared in Example 2 was tested for solubility and plugging performance to evaluate its formation pollution and tempo...

Embodiment 3

[0038] Take 18g of acrylamide, 14g of natural polyurethane, 2.65g of sulfonate surfactant and 4g of urea into a jar, add 38.65g of water, protect it with nitrogen, put it in a constant temperature water bath at 60°C to preheat and stir for 1 hour; then Take 1.08g of potassium persulfate, 0.18g of isomeric alcohol, and 0.09g of aluminum chloride and add them into a jar, add 1.35g of water, seal it, and pass nitrogen protection. After the reaction is complete (that is, the viscosity of the product rises to the shape of an immobile rubber sheet), take it out, cool to room temperature, and stop the reaction.

[0039] The product was taken out and placed in an oven, and dried at 35°C for 72h. After crushing, sieve to obtain black solid granular temporary plugging agent products with different particle sizes such as 1-3mm and 5-8mm.

[0040] The temporary plugging agent prepared in Example 3 was tested for solubility and pressure resistance to evaluate its formation pollution and t...

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Abstract

The invention provides an inter-slit temporary plugging agent and a preparation method thereof. The inter-slit temporary plugging agent consists of the following components in percentage by mass: 37.625-48.375% of polyacrylamide, 35-45% of natural polyurethane, 6-8% of a sulfonate surfactant and 10-12% of urea. The preparation method comprises the step of initiating polymerization and crosslinking of acrylamide to generate a mixed crosslinking system of polyacrylamide and natural polyurethane by taking an acrylamide monomer, natural polyurethane, the sulfonate surfactant and urea as raw materials, potassium sulfate as an initiating agent, isopropanol as a chain transfer agent, and aluminum chloride as a crosslinking agent. The temporary plugging agent has nontoxic and harmless raw materials, has the characteristics of low cost, simple process, strong capability of forming filter cakes at high temperature, high plugging efficiency and strong plugging effect, and does not generate residues after being completely dissolved, so that the temporary plugging agent is suitable for inter-slit temporary plugging of high-temperature formation breakdown, and is an environment-friendly temporary plugging agent.

Description

Technical field: [0001] The invention relates to a temporary plugging agent between fractures and a preparation method thereof. The temporary plugging agent is used for fracturing of high-temperature formations, belongs to the field of oil field chemical industry, and mainly relates to a temporary plugging agent for oilfield repeated fracturing process diversion. Background technique: [0002] Worldwide, heterogeneous reservoirs have the characteristics of relatively scattered vertical distribution, many oil layers, and strong vertical heterogeneity, but multi-layer general fracturing cannot achieve balanced stimulation. The technology can replace the traditional layering technology to a certain extent, realize the balanced stimulation of multi-layer and long-span reservoirs, and also realize the fracturing of new fractures in old wells, so as to achieve the effect of increasing and stabilizing production. [0003] The one type of auxiliary agent that plays a decisive role i...

Claims

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Application Information

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IPC IPC(8): C09K8/512C08F120/56C08J3/24
CPCC08F120/56C08J3/24C08J2333/26C08J2375/04C09K8/512C09K2208/18
Inventor 黄波葛际江周广清张贵才张燎源蒋平张子麟张旋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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