Straight through cement mixer

Abstract

A cement mixing method for mixing cement used in cementing oil wells casing and the mixer used in that method. The mixer employs a straight bulk cement inlet, five annular recirculation jet and five annular water jet orifices located downstream of the recirculation jets so that all of the jets discharge at an angle towards the mixing chamber. The five annular recirculation jets are located in alternating longitudinal alignment within the mixing chamber relative to the five annular water jets. This five jet, intersecting flow design allows for more thorough wetting of the cement powder with a smaller, lighter, less expensive and more durable mixer that is less inclined to foul and easier to clean.

Description

technical field [0001] The present invention relates to a high-efficiency, high-energy mud mixer mainly used for mixing oil field cement in a recirculation system for cement grouting of casings in oil and gas wells. A cement mixer mixes dry powder and water with recycled cement slurry to build a cement mixture. The cement mixer uses a straight-through design, which is easier to clean than the prior art, and which can be viewed through-through when the connection at the dry powder inlet is removed from the mixer. The cement mixer also has an increased number and volume of annular water flow openings and recirculation openings which allow more water and cement slurry with less wear on the mixer surfaces than prior art designs. The prior art design does not allow for more recirculation and water jets because there is no room for adding them. This new design allows the agitator surfaces to be made of less expensive materials without compromising performance and longevity, thereb...

AI Technical Summary

Problems solved by technology

[0004] Furthermore, the four annular water jets in earlier mixers had a smaller flow capacity, resulting in a higher velocity of the liquid flow in the mixer chamber to obtain comparable flow rates and thus due to the corrosive sand in the dirty mixing water resulting in further corrosion of the inner agitator surface,

Additionally, earlier mixers used more complex designs with multiple channels, all of which were susceptible to corrosion from dirty mixing water

This corrosion will result in more equipment maintenance and shorter equipment life

In an attempt to protect earlier agitators from corrosion, some surfaces were hard coated or constructed of heat-treated stainless steel, both of which added to the cost of the equipment

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