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. 29, 1980
Filed:
Jun. 12, 1978
Charles W Kinney, Houston, TX (US);
Baker International Corporation, Orange, CA (US);
Abstract
Apparatus is run on tubing string for pressure surging operations. Fluid is in the annular area between the tubing string and the well bore and fluid is also within the tubing string with a packer separating the annulus fluid from the tubing fluid. A first valve body contains means for connecting the valve body to the tubing string and has flapper valve head means normally blocking fluid flow through the first valve body. A valve seat is carried on the first valve body. A first piston is responsive to pressurization of the annulus fluid to shift the flapper valve head away from the seat to allow fluid flow through the first valve body. Locking means are carried on the first valve body to prevent longitudinal shifting of the first piston in at least one direction after the piston is shifted to open the first valve. A second valve body is responsive to tubing pressure and contains first lock means for locking a seal means therein to isolate the central bore. A by-pass is defined on the second valve body and is closed by location of second piston means selectively sealingly located thereacross. The second piston means is responsive to pressurization of the tubing fluid to move the piston in a first direction to a first position to open the fluid by-pass. Means for locking the second piston in a first position are on the piston and the second valve body. A cylindrical tubular air chamber communicates between the valve bodies.