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. 18, 2000
Filed:
Mar. 27, 1998
Matthew T Scott, Austin, TX (US);
Weatherford International, Inc., Houston, TX (US);
Abstract
Installation/removal assembly and method are disclosed that reduce forces required for installing and removing from a wellbore hydraulic artificial lift installations, such as, for example, hydraulic reciprocating pumps, hydraulic jet pumps, coil tubing hydraulic jet pumps, and other hydraulically operated installations. The installation/removal assembly is provided with a hydraulically activated latch and spear assembly that, in a preferred embodiment, includes no radially extending latch elements for securing a bottomhole assembly to a reservoir connection, such as a seating nipple designed for use with mechanical latches. A bottomhole assembly is provided with relatively moveable inner and outer members that move between closed and open positions for respectively sealing or equalizing, differential pressure across a one-way valve that arises when the pump is turned off. The pressure above the one-way valve may be the same as the annulus pressure between the production tubing and the bottomhole assembly of the hydraulic artificial lift installation. External communication embodiments of the present invention communicate directly to the annulus between the production tubing and the bottomhole assembly of the artificial hydraulic lift installation. Internal communication embodiments of the present invention communicate internally of the outer member through the pump output port to the annulus to avoid debris that may exist in the annulus below a pump discharge port.