Preparation method for preparing low-density oil well cementing cement briquettes by vermiculites

Abstract

The invention provides a preparation method for preparing low-density oil well cementing cement briquettes by vermiculites. The preparation method comprises vermiculite balling treatment, high-temperature expanding and sintering, dosing, mixing, stirring and size-mixing, die testing and strength test, and is characterized by carrying out stirring and size-mixing for 40s to 50-70wt% of G-grade oil well cement, 20-40wt% of blind-hole hollow glass microspheres with particle size of 10-80mu m, 5 to 7wt% of fly ash with loss on ignition of 1.1%, 1.5 to 2wt% of calcium oxide with purity of 99.9%, 0.5 to 1.0wt% of sodium sulfate and 1 to 3wt% of micro-silicon in a stirrer according to a water cement ratio of 0.5-0.7 (W/C), pouring into two test molds in one group, wherein length, width and height of each test mold are 53mm, 53mm and 53mm respectively, curing for 24h and 48h in a water-bath curing box at the constant temperature of 52 DEG C, immersing for 1h in cold water after de-molding, and then carrying out strength test. Therefore, the performance of the low-density oil well cementing cement briquettes is better than that of floating microspheres.

Description

technical field [0001] The invention relates to a low-density 1.3-1.5g / cm3 prepared by using vermiculite 3 The invention relates to a preparation method of an oil well cementing cement test block, which belongs to the technical field of materials. 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 ...

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 As a cementing lightening agent, sodium ions affect the water loss reduction of oil well cement, resulting in a narrow product range and high cost