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Epoxy resin-based well cementing fluid and preparation method thereof

A technology of epoxy resin and cementing fluid, which is applied in the field of oil and gas well cementing, can solve the problems that the curing time of resin materials cannot be effectively controlled, the curing time of sealing agent is long, and the impact on well completion operations can be solved, so as to improve the mechanical properties and structural stability, high strength, and improved rheological properties

Pending Publication Date: 2019-11-22
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 107936933 A (a chemical sealant for oil-water well lining small casing cementing and its preparation method) discloses a kind of epoxy-modified phenolic resin glue, diphenol propane type epoxy resin, intermediate The chemical mounting agent prepared by a certain proportion of phenylenediamine, absolute ethanol, dibutyl phthalate, ethylene glycol, flexible carbon fiber, etc., its reaction time and plugging strength meet the requirements, and its low viscosity is conducive to on-site Pump injection, after curing, the compressive strength and shear strength are high, and it has hydrophobicity, which can completely isolate the water body from corrosion and achieve the purpose of complete repair, but the curing time of the sealant is long, which affects the later completion operation
[0004] Although the above research status has solved the brittleness problem of oil well cement to a certain extent and improved the integrity of wellbore sealing, the curing time of resin materials at different temperatures cannot be effectively controlled
Moreover, the composite use of resin-based materials and oil well cement cannot make full use of the advantages of elasticity and toughness of resin materials.

Method used

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  • Epoxy resin-based well cementing fluid and preparation method thereof
  • Epoxy resin-based well cementing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] First prepare modified nano-graphene oxide, the process is as follows: screen nano-graphene oxide powder to obtain graphene oxide with a diameter of about 2 μm and a thickness of about 1 nm; get 0.3g nano-graphene oxide and dissolve it in 61.5wt% ethanol aqueous solution, use After ultrasonic treatment for 3 hours, a uniform dispersion was formed, which was placed in a four-necked flask and stirred at a speed of about 1000r / min; the pH value of the system was adjusted to 4 with acetic acid; then 45mL of γ-aminopropyl triethoxy Slowly drop the mixture of absolute ethanol and base silane into a four-necked flask, and place it in a microwave reactor at 80°C for 8 hours to obtain a paste product, which is washed and centrifuged with absolute ethanol, and then placed in a vacuum freezer. Dried in a desiccator and ground to obtain surface-modified nano graphene oxide powder.

[0037] Preparation of epoxy resin-based cementing fluid:

[0038] (1) Weigh bisphenol A oily epoxy ...

Embodiment 2

[0042] (1) Weigh bisphenol A oily epoxy resin, epoxy fatty acid methyl ester, modified nano graphene oxide (prepared by Example 1), gas phase dioxide Add silicon and hollow glass microspheres into the mixing container in sequence, and stir evenly at 25°C±2°C without solid phase precipitation to obtain component A of the synthetic cementing fluid;

[0043] (2) Weigh m-aminobenzylamine, 2,4,6-tris(dimethylaminomethyl)phenol, butyl acetate and bamboo fiber in a weight ratio of 15:3:20:1.5 and add them to another mixing container in sequence , mixed uniformly at 25°C±2°C to obtain component B of the synthetic cementing fluid;

[0044] (3) Add component A and component B into a mixing container at a weight ratio of 3.08:1, and mix well to obtain a modified nano-fiber epoxy resin cementing fluid for well cementing.

Embodiment 3

[0046] (1) Weigh bisphenol A oily epoxy resin, alkylene glycidyl ether, modified nano-graphene oxide (prepared by Example 1), microsilicon Add the barite and barite into the mixing container respectively in this order, and stir evenly at 25°C±2°C without solid phase precipitation to obtain component A of the synthetic cementing fluid;

[0047] (2) Weigh m-aminobenzylamine, N,N-diethylaminopropylene oxide, butyl acetate and bamboo fiber in a weight ratio of 10:0.5:15:2.0, and mix them at 25°C±2°C Uniform, to obtain synthetic cementing fluid B component;

[0048] (3) After component A and component B are placed in a mixing container with a weight ratio of 5.7:1 and fully mixed, the modified nano-fiber epoxy resin cementing fluid for well cementing is prepared.

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Abstract

The invention relates to an epoxy resin-based well cementing fluid and a preparation method thereof. The well cementing fluid includes, by weight, 100 parts of bisphenol A oily epoxy resin, 15-35 parts of an active diluent, 10-25 parts of a diluent, 10-20 parts of an aromatic amine curing agent, 0.1-5.0 parts of a curing accelerator, 0.1-3.0 parts of a flexibilizer, 0-210 parts of a density regulator, 0.1-5.0 parts of a suspension stabilizer and 1-3 parts of natural bamboo fibers. The flexibilizer is modified nano graphene oxide, and is prepared by the following steps: dissolving nano grapheneoxide powder into an ethanol solution; carrying out ultrasonic treatment to form a uniform dispersion liquid; adjusting the pH value of the system to 3-5; slowly dropwise adding an absolute ethyl alcohol mixed solution of gamma-aminopropyltriethoxysilane; putting the mixture into a microwave reactor for treatment; then performing washing, centrifugation, drying and grinding. The well cementing fluid is good in flowability, easy to pump, adjustable in thickening time, wide in density range and wide in applicable temperature, and the preparation method is reliable in principle, easy and convenient to operate and free of pollution to the environment and has wide market application prospects.

Description

technical field [0001] The invention relates to an epoxy resin-based cementing fluid and a preparation method thereof, belonging to the technical field of oil and gas well cementing. Background technique [0002] Well cementing is an important link in oil and gas development, and a key technology to ensure high, stable, and safe production and operation of oil and gas wells. The sealing integrity of the cement sheath is of great significance to oil and gas production. With the development of domestic oil and gas exploration and development towards deep wells, ultra-deep wells and complex wells, the temperature and pressure at the bottom of the well are constantly increasing, and the downhole conditions are becoming more and more complex. Traditional oil well cement-based material cementing operations have problems such as high brittleness of the cement sheath, easy damage to the structural integrity of the cement sheath, and micro-gap in the annulus, which lead to the failu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44C08G59/18
CPCC08G59/18C09K8/44
Inventor 于永金张弛李明夏修建靳建洲张华徐明齐奉忠刘子帅刘慧婷冯宇思
Owner BC P INC CHINA NAT PETROLEUM CORP
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