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Resin emulsion plugging agent composition, preparation method thereof and application of composition in fractured stratum

A technology of resin emulsion and plugging agent, which is used in drilling compositions, chemical instruments and methods, and earthwork drilling and mining, etc., can solve the problems of poor long-term temperature resistance and high temperature resistance in high temperature resistance, and achieve low construction costs. , Improve the strength, the effect of less equipment

Active Publication Date: 2019-06-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects of conventional gel plugging agents in the prior art that are not resistant to high temperature, and the defects of water-swellable resin plugging agents in high temperature resistance, especially poor long-term temperature resistance, and provide a resin Emulsion plugging agent composition and its preparation method and application in fracture formation

Method used

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  • Resin emulsion plugging agent composition, preparation method thereof and application of composition in fractured stratum
  • Resin emulsion plugging agent composition, preparation method thereof and application of composition in fractured stratum

Examples

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preparation example 1

[0080] This preparation example is to illustrate the water-based resin emulsion prepared by the present invention.

[0081] (1) Tween80 and 1g of hydrophilic nano-SiO with a mass fraction of 10g 2 At the same time, add it to 39mL deionized water, stir well to make it dissolve evenly, and obtain a solution;

[0082] (2) Add 50 g of resin binder urea-formaldehyde resin to the solution prepared in step (1), and stir at a high speed under the stirring condition of 600 rpm to make it emulsify evenly.

[0083] As a result, a water-based resin emulsion 1 was obtained. The performance parameters were as follows: the water-based resin emulsion was an oil-in-water emulsion with a viscosity of 35 mPa.s. The particles in the dispersed phase were regular spherical particles with an average particle diameter of 635 nm.

[0084] figure 1 It is the micrograph observed under a microscope of the water-based resin emulsion 1 prepared by Preparation Example 1 of the present invention; figure 1...

preparation example 2

[0086] This preparation example is to illustrate the water-based resin emulsion prepared by the present invention.

[0087] (1) Tween80 with a mass fraction of 6g and hydrophilic nano-SiO of 2g 2 At the same time, add it to 62mL deionized water, stir well to make it dissolve evenly, and obtain a solution;

[0088] (2) Add 30 g of resin binder amino resin into the solution prepared in step (1), stir at high speed to make it emulsify evenly.

[0089] As a result, water-based resin emulsion 2 was obtained. The performance parameters were as follows: the water-based resin emulsion was an oil-in-water emulsion with a viscosity of 25 mPa.s, and the particles in the dispersed phase were regular spherical particles with an average particle diameter of 850 nm.

Embodiment 1

[0091] This embodiment is to illustrate the resin emulsion plugging agent prepared by the method of the present invention.

[0092] The composition of the resin emulsion plugging agent is: the water-based resin emulsion 1 prepared in Preparation Example 1; the curing agent is modified diethylenetriamine; the coupling agent is γ-aminopropyltriethoxysilane; nano hectorite It is a nanoscale lamellar lithium bentonite with positive charge on the crystal surface and negative charge on the edge of the crystal. It is disc-shaped with an average diameter of 25nm and an average thickness of 0.92nm; the flexible fiber is polypropylene fiber with an average diameter of 60μm , with an average length of 1mm and a density of 0.91g / cm 3 .

[0093] The content of the resin emulsion plugging agent is: the consumption of the water-based resin emulsion 1 is 93.1wt%, the consumption of the curing agent is 4wt%, the consumption of the coupling agent is 0.4wt%, the nanometer lithium soap The amou...

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Abstract

The invention relates to the field of drilling fluid plugging and discloses a resin emulsion plugging agent composition, a preparation method thereof and application of the composition in a fracturedstratum. The composition comprises a water-based resin emulsion, a curing agent, a coupling agent and nano lithium bentonite, wherein with the total weight of the composition as a standard, the content of the water-based resin emulsion is 90.5-95.8 wt%, the content of the curing agent is 3-7 wt%, the content of the coupling agent is 0.2-0.5 wt%, and the content of the nano lithium bentonite is 1-3wt%. The resin emulsion plugging agent prepared by the method has uniform and stable dispersion performance, is solidified under a high-temperature condition after being injected into a crack, and forms a solidified body with high strength and toughness, wherein the cementation strength between the solidified body and the wall surface of rock is high. The composition is particularly suitable fora leaking stratum with multi-scale cracks which are formed together.

Description

technical field [0001] The invention relates to the field of drilling fluid plugging, in particular to a resin emulsion plugging agent composition, a preparation method thereof and an application in fractured formations. Background technique [0002] Lost circulation is one of the most common downhole complex problems in the drilling process at present. It directly reduces the drilling speed and increases the drilling cost. Lost circulation may occur in different types of formations, among which the formation with fractures and fractures and caves is the most serious and the most difficult to plug. [0003] Chemical plugging technology is one of the commonly used and effective technologies to control fractures and fracture-cavity malignant lost circulation. This technology injects a certain amount of plugging agent solution into the lost layer, and seals the fracture after solidification to isolate the drilling fluid. interaction with formation fluids. [0004] Gel pluggin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C09K8/44E21B33/13
Inventor 白英睿吕开河孙金声黄贤斌刘敬平王金堂
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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