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Preparation method of self-phase-change proppant based on emulsified toughened bio-based epoxy resin

A technology based on epoxy resin and proppant is applied in the field of preparation of self-phase change proppant, which can solve the problems of complex staged laying process and poor migration ability of solid proppant, achieve good migration ability, improve development Efficiency and stable performance

Active Publication Date: 2022-03-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of poor migration ability of conventional solid proppants and complex segmental laying process in the prior art, the present invention provides a preparation method of self-phase change proppant based on emulsified toughened bio-based epoxy resin

Method used

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  • Preparation method of self-phase-change proppant based on emulsified toughened bio-based epoxy resin
  • Preparation method of self-phase-change proppant based on emulsified toughened bio-based epoxy resin
  • Preparation method of self-phase-change proppant based on emulsified toughened bio-based epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Synthesis and evaluation of a low-viscosity, low-density bio-based epoxy resin.

[0042] (1) Synthesis of low-viscosity, low-density bio-based epoxy resin.

[0043] Using dimethyl sulfoxide as a solvent, eugenol and 1-thioglycerol with a molar ratio of 1:1 and 2% catalyst 4-dimethylaminopyridine (DMAP) of the total mass of the reaction monomer were placed in the solvent and heated at 65 The reaction was carried out at a temperature of ℃ for 4h, and a light yellow product was obtained. Subsequently, at a reaction temperature of 85°C, the above light yellow reaction product was reacted with epichlorohydrin in an ethanol solution with a NaOH mass concentration of 10% for 6 hours, and then the product was purified using a saturated sodium bicarbonate solution to obtain the target bio-based ring. Oxygen resin, the reaction formula and the morphology of the product are as follows figure 1 , figure 2 shown.

[0044] (2) Evaluation of low-viscosity, low-density ...

Embodiment 2

[0058] Example 2: Toughening modification of bio-based epoxy resin.

[0059] In order to overcome the shortcomings of epoxy resin such as poor toughness and notch sensitivity, so that the proppant prepared based on the obtained bio-based epoxy resin has better compressive strength, organic components or inorganic components are added to the matrix before curing. The physical method of rigid particles is used to toughen and modify the obtained resin, and the optimal type and amount of added particles are optimized by evaluating the physical properties of the cured resin. The epoxy resin curing agent used in the evaluation experiment is an adduct of diethylenetriamine and butyl glycidyl ether with good curing ability in wet environment. The curing agent has good curing ability in wet environment. When it is 25% of the resin mass, it can be fully cured within 40 minutes at an ambient temperature of 60°C, meeting the needs of supporting reservoirs after on-site fracturing.

[006...

Embodiment 3

[0066] Example 3: Preparation of self-staged emulsified phase change proppant.

[0067] In this example, SiO with a particle size of 50 nm was selected as the self-staged emulsified phase change proppant 2 Particles were used as emulsifier to prepare phase change proppant by Pickering emulsification technique. When the emulsifier is used at a concentration of 0.5%, six kinds of resin proppants with different particle sizes are mainly formed. The particle size of the proppant is as follows: Figure 7 As shown, they are 2.9mm (7 mesh), 1.7mm (12 mesh), 0.95mm (20 mesh), 0.6mm (30 mesh), 0.4mm (40 mesh) and 0.18mm (80 mesh), which can meet the simultaneous Requirements for the mesh number of proppant supporting the near-wellbore zone, main fractures and branch fractures.

[0068] In order to make the obtained proppant suitable for different reservoir environments, in this example, by changing the concentration of the emulsifier, the particle size distribution of the proppant ob...

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Abstract

The invention belongs to the technical field of oilfield development, and discloses a self-phase-change proppant based on emulsified toughened bio-based epoxy resin. Bio-based epoxy resin is subjected to toughening modification through graphite particles, then SiO2 particles are used as an emulsifier for emulsification, the propping agent is prepared, the proportion of different meshes in the propping agent is adjusted by changing the concentration of the emulsifier during emulsification, and the chemical formula of the bio-based epoxy resin is shown in the specification. The proppant particles have good sphericity, so that the fracture permeability is high after the proppant particles are laid, and residual oil in formation pores can be effectively exploited, so that the development efficiency of an oil field is improved.

Description

technical field [0001] The invention belongs to the technical field of oil field development, in particular to a preparation method of a self-phase-change proppant based on emulsified and toughened bio-based epoxy resin. Background technique [0002] Hydraulic fracturing technology has been widely used in major oilfields as the main technical means for reservoir stimulation and enhanced oil recovery. In hydraulic fracturing technology, injecting solid proppant to prevent the fractures from reclosing is the key to ensuring high conductivity of fractures. Quartz sand, ceramsite and other solid proppants commonly used in oil fields at this stage usually require high-viscosity sand-carrying fluid to effectively carry the solid proppant due to their high density, so there are many limitations in the use process: ① High-viscosity sand-carrying fluid It is often to increase the viscosity of the liquid by adding a thickener to obtain good sand-carrying properties, but the thickener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/80C09K8/584C07C319/18C07C323/16C07D301/28C07D303/28C07D301/36
CPCC09K8/80C09K8/584C07C319/18C07D301/28C07D303/28C07D301/36C09K2208/06C07C323/16C09K8/62C09K8/588
Inventor 樊家铖郭天魁陈铭曲占庆戴彩丽周福建王增林齐宁胡毅
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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