Preparation method for preparing low-density bond cement check block for oil well by microcrystal glass beads

Abstract

The invention provides a preparation method for preparing a low-density bond cement check block for an oil well by microcrystal glass beads, wherein the density of the low-density bond cement check block is 1.0-1.5g / <cm3>. The method comprises the following steps of: preparing microcrystal glass beads; dosing; mixing; stirring and size-mixing; testing moulds; testing strength. The preparation method is characterized by comprising the following steps of: stirring and size-mixing 50-70wt% of G-grade oil well cement, 20-40wt% of closed hollow glass beads with grain size of 10-100um, 5-7wt% of coal ash with loss on ignition of 1.1%, 1.5-2wt% of calcium oxide with the purity of 99.9% and 0.5-1.0wt% of sodium sulfate in a stirrer at a water cement ratio of 0.5-0.7(W / C) for 40 seconds; pouring into the test moulds (two moulds in a group 53mm*53mm*53mm); preserving for 24 hours and 48 hours in a 52-DEG C water bath preserving box at constant temperature; soaking for 1 hour in cold water after demoulding for strength test. The performance of the low-density bond cement check block is superior to that of floating beads.

Description

technical field [0001] The invention relates to a preparation method of a low-density oil well cementing cement test block prepared by microceramic glass beads, which belongs to the field of material technology. Background technique [0002] At present, the domestic cementing lightening agent uses floating beads in fly ash and organically synthesized sodium borosilicate to make glass beads. Fly ash includes sinking beads and floating beads, 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 to 1% of the total ash, and the aluminosilicate glass microspheres are hollow spheres. [0003] Among them,...

AI Technical Summary

Problems solved by technology

[0006] In recent years, due to the influence of smog weather, my country's large and medium-sized thermal power generation adopts environmentally friendly desulfurization technology, and the fly ash does not contain floating beads, resulting in tight supply

[0007] The aqueous solution of organically synthesized sodium borosilicate is used to make glass microspheres, and the microspheres are formed by high-pressure and high-speed centrifugal spraying, and then dehydrated by high-temperature ball formation, high-temperature sintering, The surface melts, and finally forms hollow or solid closed-cell glass beads. The particle size of the beads is between 40 and 180 microns, and the density is between 0.15 and 0.6 g / cm3,. The strength is between 3 and 60 MPa, the daily output is 2 to 4 tons, the cost of imported equipment is high, and the value of each production line equipment is more than 40 million yuan. The high temperature resistance of the motor must be greater than 1,500 degrees, the speed is 24,000 rpm, and the operating environment is poor. , affects the life of motors and other working parts, and the production efficiency is low. Glass beads made by chemical element synthesis are used as intermediate materials for other industrial products. Due to the interaction between ions, the performance of the product is affected, such as as an oil well Cementing lightening agent, excessive sodium ions affect the water loss reduction of oil well cement, resulting in a narrow product range