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A composite plugging agent with high temperature resistance and salt resistance

A technology of blocking agent and stabilizer, which is applied in the field of composite blocking agent with high temperature resistance and salt resistance, can solve the problems of increased degree of hydrolysis, excessive cross-linking, blocking by forming glue and not forming glue, etc., so as to improve the swelling resistance and temperature resistance performance. The effect of improving toughness and compactness, reducing formulation costs

Active Publication Date: 2022-06-03
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For high-temperature (greater than 90°C) and high-salt (greater than 100,000 mg / l) reservoirs, currently commonly used profile control agent measures are not effective, and on-site implementation risks are high
High temperature resistant organic plugging agents such as emulsion polymer gel and AMPS copolymer jelly currently used in oilfields are mainly polymer derivatives. The advantage is that they can be continuously injected into deep parts online. The disadvantage is that polymer derivatives are easily hydrolyzed under high temperature conditions. Enlargement, excessive cross-linking, long chain breakage, poor adsorption performance, severe shear damage, low degree of curing, limited temperature and salt resistance, limited pressure bearing capacity, etc.
High-temperature-resistant inorganic plugging agents such as sodium silicate, ultra-fine cement and other high-temperature and high-salt resistance have the disadvantages of easy compression, high hardness, poor toughness and brittleness, large volume syneresis, short injection distance, high construction risk, and failure to achieve deep sealing. Plugging
Onshore oilfields have attempted to add high-temperature-resistant resins to high-temperature-resistant inorganic materials such as cement and water glass, hoping to solve the problems of high-temperature resistance, plugging strength, and injectability. In fact, the difference in injection speed of different plugging agents is easy to separate and separate water. Injection control is difficult, and the site often causes glue to be blocked or not to be glued.

Method used

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  • A composite plugging agent with high temperature resistance and salt resistance
  • A composite plugging agent with high temperature resistance and salt resistance
  • A composite plugging agent with high temperature resistance and salt resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A composite plugging agent with high temperature resistance and salt resistance, its components and mass percentages are:

[0034] Phenolic prepolymer 25%, sodium organosilicate 25%, β-cyclodextrin polymer 10%, cross-linking agent 5%, active siloxane 10%, sodium polyphosphate 2.5%, stabilizer 5%, appropriate amount Deionized water.

[0035]Add the sodium organosilicate, phenolic prepolymer, active siloxane, β-cyclodextrin polymer, and sodium polyphosphate into the stirring reactor in turn, stir for 2 hours, and mix evenly to form an amphiphilic inclusion system, and add a stabilizer and cross-linking agent to form a gel conditioner.

[0036] The preparation method of the phenolic prepolymer is that under the action of an alkaline catalyst, the phenol and formaldehyde having a molar ratio of 2.5: 1 to 3: 1 are sucked into the reactor in batches with a vacuum pump, and the temperature is 50 ℃ to 60 ℃. It is prepared by reacting for about 4-5 hours, and the methylol cont...

Embodiment 2

[0045] The difference with Example 1 is: the mass percentage of the components is:

[0046] Phenolic prepolymer 15%, sodium organosilicate 15%, β-cyclodextrin polymer 10%, crosslinking agent 2.5%, reactive siloxane 10%, sodium polyphosphate 2.5%, stabilizer 5%, appropriate amount Deionized water. The test results are shown in Table 1.

Embodiment 3

[0048] The difference with Example 1 is: the mass percentage of the components is:

[0049] Phenolic prepolymer 15%, sodium organosilicate 15%, β-cyclodextrin polymer 10%, crosslinking agent 2.5%, active siloxane 10%, sodium polyphosphate 2.5%, stabilizer 2.5%, appropriate amount Deionized water. The test results are shown in Table 1.

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Abstract

The invention relates to a composite plugging agent, which is composed of the following components in mass percentage: 20-30% of phenolic prepolymer, 20-30% of organic sodium silicate, 1-5% of crosslinking agent, and β-cyclodextrin polymerization 10-15% of compound, 5-15% of active siloxane, 2.5-5% of sodium polyphosphate, 1-5% of stabilizer, and the balance is water. The present invention combines several high-temperature-resistant organic materials and inorganic materials through organic silicon to form a network polymer with a porous sponge-like skeleton structure, which improves the toughness and compactness of the inorganic materials, and improves the swelling resistance of the organic materials. High temperature performance, forming a new high temperature resistant gel.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and relates to a high-temperature-resistant and salt-resistant composite plugging agent. Background technique [0002] In the process of oil exploitation, most oil wells will choose water injection for development, especially for high-speed and high-liquid volume exploitation in offshore oil fields. Due to the influence of reservoir heterogeneity, water injection forms dominant channels, or forms ineffective circulation in fractures and large pores, which cannot be further developed. To improve the oil recovery, if you want to improve the development effect, it is necessary to adjust and control the contradiction between the reservoir plane and the vertical direction. The displacement adjustment agent can block the large pores, force the liquid flow to divert, expand the swept volume of water flooding, and realize the stable and high production of the oil field. the goal of. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/588C09K8/512C09K8/42C09K8/88
CPCC09K8/584C09K8/588C09K8/512C09K8/426C09K8/887C09K2208/30Y02P20/141
Inventor 李成勇冯青彭立
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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