Spherical iron oxide and ultra-high density drilling fluid adopting spherical iron oxide as weighting agent

Abstract

The invention provides spherical iron oxide. The spherical iron oxide is prepared from hematite by high-temperature flame melting, the hematite is conveyed by high-pressure oxygen to main combustion oxygen and natural gas combustion flame at a temperature being 2400 DEG C or higher, the hematite is molten by flames to form dispersed droplets, the droplets rapidly enter a cooling area under the action of negative pressure and are condensed into small spherical particles, and the spherical iron oxide is prepared accordingly. The feeding rate of the hematite is 10-40 Hz, the conveying amount of high-pressure oxygen is 110-190 m<3> / h, the amount of the main combustion oxygen is 550-660 m<3> / h, the consumption of the natural gas is 220-330 m<3> / h, and the oxygen enrichment coefficient is 1.0-1.3. According to ultra-high density drilling fluid adopting the spherical iron oxide as a weighting agent, the ultra-high density drilling fluid is prepared by taking the mixed spherical iron oxide as the weighting agent, and has good rheological property and settling stability, low water loss, high compressive strength and good cementing performance; the density of the drilling fluid is higher than 2.6 g / cm<3>.

Description

technical field [0001] The invention relates to a spherical iron oxide and an ultra-high-density drilling fluid with the spherical iron oxide as a weighting agent, which belongs to the technical field of cementing drilling fluid. Background technique [0002] Drilling fluid is the circulating flushing medium used in the hole during the drilling process. Also known as drilling flushing fluid. Drilling fluid can be divided into clear water, mud, clay-free flushing fluid, emulsion, foam and compressed air according to its composition. Clear water is the earliest drilling fluid, it does not need to be treated, it is easy to use, and it is suitable for areas with complete rock formations and sufficient water sources. Mud is a widely used drilling fluid. It is mainly suitable for unstable rock formations with loose walls, developed cracks, easy to collapse and drop blocks, and swelled and spalled when exposed to water. [0003] Drilling fluid is composed of dispersion medium, d...

AI Technical Summary

Problems solved by technology

Because their density is higher than that of barite, it can be used to prepare drilling fluid with higher density, and has certain acid solubility, so it can be applied to production layers that need to be acidified. The hardness is about twice that of barite, so Abrasion-resistant, the particle size is well maintained in use, and the loss rate is low, but the wear on drill tools, drill bits and pumps is also serious

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