Patent Number: 7,712,551

Title: Vacuum feed supply system for drilling fluid additives

Abstract: A system for forming a subterranean wellbore may include a pump and an additive supply. The pump pumps a drilling fluid into the wellbore while also generating a pressure differential that draws an additive across a supply line connected to the additive supply. The drilling fluid may be a gas or a liquid. A method for forming a wellbore may include drilling the wellbore, circulating a drilling fluid in the wellbore using a pump; and supplying an additive to the drilling fluid by flowing the additive across a supply line using a pressure differential generated by the pump. The pump may generate a vacuum pressure at a supply line outlet and/or create a pressure differential in the supply line. The flow of additive across the supply line may be regulated and/or stopped when the pump is not operating.

Inventors: Dye; William M. (Cypress, TX), Hansen; Nels A. (Spring, TX), Trenery, Jr.; John B. (Sugar Land, TX)

Assignee: Baker Hughes Incorporated

International Classification: E21B 21/06 (20060101)

Expiration Date: 5/11/12018