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Method for preparing low-density cement briquette for oil well cementation by use of silicon nitride ceramic microbeads

A silicon nitride ceramic and cement test block technology, applied in the field of materials, can solve problems such as inability to meet the needs of deep high-temperature oil wells, and achieve the effects of controllable particle size, low production cost, and advanced technology

Inactive Publication Date: 2014-06-25
于海花
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Due to the gradual reduction of oil and gas resources in low-temperature oil wells on land, the development of low-temperature oil wells on land has gradually shifted from low-temperature oil wells on land to deep land and ocean deep layers. The traditional cementing material floating beads cannot meet the needs of deep high-temperature oil wells.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of silicon nitride ceramic closed-cell hollow microspheres ① Batching and firing: silicon nitride powder with a particle size of 1-15 μm, lutetium oxide powder with a particle size of 5-20 μm and phenolic resin with a particle size of 20-30 μm in a weight ratio of 65wt%: 7wt%: 28wt% After mixing and stirring evenly, add 200% ethanol according to the weight of the mixed powder and stir evenly, press into a billet and dry, and burn in a vacuum atmosphere furnace at 1750 ° C for 4 hours to obtain a sintered body of silicon nitride ceramic material. The sintered body of silicon nitride ceramic material is processed into 10-15 μm microbeads in the spheroidization machine, ② liquid preparation: take 10-15 μm silicon nitride ceramic microbeads at a ratio of 78wt%: water 22 wt%, add light Potassium sulfate foaming agent, the concentration is 1g / L ④ Filtration: remove large particles and impurities; ⑤ Firing: use high-pressure jet high-speed centrifugal rotary spr...

Embodiment 2

[0043] (1) Preparation of silicon nitride ceramic closed-cell hollow microspheres ① Ingredients firing: silicon nitride powder with a particle size of 20-35 μm, lutetium oxide powder with a particle size of 25-40 μm and phenolic resin with a particle size of 31-40 μm in a weight ratio of 75wt%: 5wt%: 20wt% After mixing and stirring evenly, add 250% ethanol according to the weight of the mixed powder and stir evenly, press into a billet and dry, and burn in a vacuum atmosphere furnace at 1800 ° C for 3.5 hours to obtain a sintered body of silicon nitride ceramic material. The sintered body of silicon nitride ceramic material is processed into 20-25 μm microbeads in a spheroidizing machine ② Liquid preparation: 20-25 μm silicon nitride ceramic microbeads ratio 75 wt%: water 25 wt%, add light sulfuric acid to the slurry Potassium foaming agent with a concentration of 1.5g / L ④ Filtration: remove large particles and impurities; The dry sintering temperature is 1500 °C, the surface ...

Embodiment 3

[0057](1) Preparation of silicon nitride ceramic closed-cell hollow microspheres ① Batching and firing: Silicon nitride powder with a particle size of 40-50 μm, lutetium oxide powder with a particle size of 45-65 μm and phenolic resin with a particle size of 41-50 μm are 80wt% by weight: 6wt%: 14wt% After mixing and stirring evenly, add 300% ethanol according to the weight of the mixed powder and stir evenly, press into a billet and dry, and burn in a vacuum atmosphere furnace at 1850 ° C for 3 hours to obtain a sintered body of a silicon nitride ceramic material. The sintered body of silicon nitride ceramic material is processed into 30-40μm microbeads in the spheroidization machine, ② liquid preparation: 30-40μm silicon nitride ceramic microbeads ratio 80 wt%: water 20 wt%, add light weight to the slurry Potassium sulfate foaming agent, the concentration is 2g / L ④ Filtration: Remove large particles and impurities; ⑤ Firing: Use high-pressure jet high-speed centrifugal rotary ...

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Abstract

The invention provides a method for preparing a low-density cement briquette for oil well cementation by silicon nitride ceramic microbeads. The method comprises the steps of preparing silicon nitride ceramic closed-pore hollow microbeads, proportioning, mixing, stirring to form a slurry, testing a mold and carrying out a strength test; specifically, the method comprises the following steps: evenly mixing and stirring 40-50wt% of G-grade oil well cement, 10-15wt% of superfine cement having a grain size of 13 microns, 25-35wt% of silicon nitride ceramic closed-pore hollow microbeads having a grain size in the range from 5 to 50 microns, 5-7wt% of fly ash having the ignition loss of 1.1%, 1.5-2wt% of calcium oxide having the purity of 99.9%, 0.5-1.0wt% of sodium sulfate and 1-3wt% of micro-silicon together, stirring in a stirrer in a water-cement ratio of 0.5-0.6 (W / C) to form a slurry for 40 seconds, pouring the mixture in a mold to test the mold, curing for 24 hours and 48 hours in a water-batch curing box at a constant temperature of 52 DEG C, demolding and then soaking in cool water for 1 hour to carry out a performance test.

Description

technical field [0001] The invention relates to a method for preparing a low-density oil well cementing cement test block with silicon nitride ceramic microspheres, and belongs to the field of material technology. Background technique [0002] At present, domestic oil well cementing lightening agent uses floating beads in fly ash, including sinking beads and floating beads in fly ash, and the density of sinking beads is 1.1 ~ 2.8g / cm 3 , between, and the content accounts for 30-70% of fly ash. Floating beads are glass beads in fly ash that are less dense than water. Floating beads mainly include aluminosilicate glass beads and porous carbon particles. Floating beads after removing carbon particles It mainly includes thin-walled aluminosilicate glass beads with smooth inner and outer surfaces and large volume. 0.5-1% of the total amount of ash, the aluminosilicate glass microspheres are hollow spheres, and the floating beads in the fly ash are when the coal powder is burned ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B14/02
Inventor 郭志东
Owner 于海花
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