The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 1991
Filed:
Mar. 30, 1989
Dale V Johnson, Metairie, LA (US);
John R Gordon, New Orleans, LA (US);
Exxon Production Research Company, Houston, TX (US);
Abstract
An improved surface controlled chemical injection valve and method for injecting chemical fluid into the bore of a tubing string of a well are provided, the chemical injection valve having at least one piston movable in response to the pressure of the chemical fluid, an actuator connected to the piston, and a flow restrictor wherein the pressure of the chemical fluid supplied to the valve from the chemical fluid source acts on the piston to cause the actuator to open the valve and inject the chemical fluid into the tubing string bore. The flow restrictor is mounted downstream of the piston to create sufficient available pressure in the chemical fluid upstream of the flow restrictor to act on the piston and hold the valve in the open position.