ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,428,934, issued on Sept. 30, was assigned to Silverwell Technology Ltd. (Cambridge, Great Britain).
"Selectively injectable chemical additive" was invented by Joel David Shaw (Houston).
According to the abstract* released by the U.S. Patent & Trademark Office: "An apparatus for producing fluid from a wellbore includes production tubing in the wellbore, an annulus around the tubing, and a chemical injection system for injecting chemical additive into the production tubing from the annulus. The chemical additive system includes an injection module with a valve that is selectively opened and closed by operating an actuator. When the valve is opened, the chemical additive is injected in...