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US 5,571,281 AGranted
Automatic cement mixing and density simulator and control system and equipment for oil well cementing
OwnerThomas E. Alleninventor
Life of this patent
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Abstract
A cement mixing and slurry density control system utilizes an improved eductor mixer for particular use in a cementing process for an oil or gas well.
Claims18
Apparatus for mixing and maintaining density of cement slurries for a well comprising:
- a vehicle transportable to a site adjacent said well;
- a first slurry mixing tank;
- said tank including means to mix said slurry therein;
- an eductor conduit, the outlet of which enters said first slurry mixing tank, said eductor comprised of:
- a central water conduit and nozzle for controllably injecting water under pressure to the outlet of said eductor;
- a casing surrounding said nozzle creating a first annular space around said conduit and nozzle;
- means to introduce dry cement into said first annular space;
- a second annular space between said eductor conduit and said casing;
- and
- means to recirculate slurry from said first mixing tank to said second annular space.
7 more elements
A method for mixing cement slurries comprising:
- mixing said slurry in a first tank;
- recirculating said slurry from said first tank to an annular space co-axially surrounding a nozzle chamber creating a mixed slurry of said recirculated slurry with dry cement and water by introducing dry cement into said nozzle chamber, and
- introducing controllable amounts of water to a coaxial nozzle and returning said mixed slurry from an outlet of said nozzle to said first tank.
An eductor for mixing pulverant material with a liquid to form a slurry comprising:
- an eductor housing having a central axis and a downstream outlet conduit for directing resulting slurry into a holding tank;
- a central axial conduit and nozzle for controllably injecting liquid under pressure toward said outlet conduit;
- a casing surrounding said nozzle creating a first annular space around said central conduit and nozzle;
- means to introduce dry pulverant material into said first annular space;
- a second annular space between said eductor housing and outlet conduit;
- and
- means to recirculate slurry form said holding tank into said second annular space.
4 more elements
Dependencies are inferred from the claim text.