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:
Feb. 20, 2001
Filed:
Jun. 07, 1999
Mark L. Wyatt, The Woodlands, TX (US);
Brad N. Huber, Houma, LA (US);
Other;
Abstract
Two sliding sleeves are carried in a tubular pipe assembly for controlling the opening and closing of flow passages extending through the pipe wall. The pipe assembly is placed at the lower end of a tubing string disposed in a well to regulate the flow of fluid from the string into a subsurface well formation. The first sleeve extends between upper and lower seals disposed above and below the flow passage to close the flow passages to flow. A shifting tool operated from the well surface moves the sleeve axially down through the pipe assembly to open the flow passages, leaving the upper seal exposed. The shifting tool then moves the second sleeve axially down through the pipe to cover the exposed seal. Fluid pumped through the pipe exits freely through the flow passages without first having to flow through radial flow passages in the sliding sleeve to prevent erosion of the flow passages and the sleeve structure. The two sleeve sections protect the upper and lower seals and sealing surfaces from erosion as fluid is pumped.