Atmospheric storage mechanical weight batch blending plant

摘要

An atmospheric storage mechanical weigh batch blend plant is shown with atmospheric storage for providing a dry, pre-blend, oilfield cement ready for mixing at the wellhead for slurry injection into a well head upon adding the proper amount of water and other fluids. The batch blend plant has three separate weighing mechanisms for (a) larger or bulk quantity materials, (b) intermediate quantities of materials, and (c) small amounts of additives to be included to the mixture. The entire weigh batch blend plant can be disassembled and moved. A special pressurized air bearing is used in the blender.

主权项

1. An atmospheric storage batch-type blend plant for providing a dry, pre-blended, cement prepared according to a recipe for use in oil well encasement, said batch blend plant comprising:
a blender for receiving measured, dry materials to be thoroughly blended into a an accurate pre-blend, the blender having a blender housing, a shaft protruding from the housing, and a bearing assembly attached to the blender housing and surrounding part of the shaft; a plurality of bulk storage tanks; a bulk weigh batcher for measuring by weight bulk materials from said plurality of bulk storage tanks; bulk delivery device for delivering said bulk materials from said bulk weigh batcher to said blender; an intermediate weigh vessel for measuring by weight intermediate materials from intermediate storage tanks; an intermediate delivery device for delivering said intermediate materials from said intermediate weigh vessel to said blender; mini batch weigh vessels for measuring by weight small amounts of additives; an additives delivery device for delivering small additives after said measuring to said blender; said bulk weigh batcher measuring large quantities by weight, said mini batch weigh vessels measuring small quantities by weight and said intermediate weigh vessel measuring intermediate quantities by weight, all of which are mixed together to give said pre-blend; pre-blend containers for receiving said pre-blend after the weighing and blending of said recipe of said bulk materials, said intermediate materials and said small amounts of said additives in said blender; and a source of pressurized air being connected to said bearing assembly to provide said pressurized air between bearings in said bearing assembly and said shaft to prevent abrasive materials from getting between said bearings and said shaft.