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:
Jan. 22, 1985
Filed:
Dec. 06, 1982
Charles R Williams, Carrollton, TX (US);
John H Yonker, Carrollton, TX (US);
Robert L Thurman, McKinney, TX (US);
Otis Engineering Corporation, Dallas, TX (US);
Abstract
A well system for injection into a selected formation in each tubing string in a multiple formation dual string well completed for through flow line/pumpdown operation, utilizing a string of tools which may be pumped down tubing to open selected tubing sleeve valves between packers. Each tool string includes a pressure openable injection valve which seals across the open sleeve valve and is opened for formation injection flow at preselected pressures by application of tubing pressure at the surface. One type of injection valve closes to flow through when pressure opened for injection flow. The other injection valve is closed to injection flow on insertion of a closing prong having a through flow passage. Both injection valves and their respective tool strings may be individually retrieved closing sleeve valves in each tubing and the formations to injection.