Wireless coiled tubing joint locator
US6253842A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1998 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Sep 1, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/095
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A wireless coiled tubing joint locator for locating joints or collars in a production tubing string. The joint locator is adapted for running into a well on coiled tubing, and other downhole tools may be connectable to the joint locator. An electromagnetic coil assembly senses the increased mass of a pipe joint, and provides a signal to an electric circuit which generates a momentary electric output signal received by a pilot solenoid valve. The solenoid valve momentarily opens a pilot passageway which activates a piston to close a circulation port in the joint locator. This closing of the circulation point results in an increase in a surface pressure reading observable by the operator. A rupture disk is provided so that pressure cannot be applied to any downhole tool below the joint locator prematurely, and a seat sleeve is provided to prevent premature communication of fluid to the rupture disk but can be opened at any time by dropping a ball into the joint locator. The electronic circuit can be configured to provide a selected one of a plurality of time delays. A fixed test period is also provided in the circuit which delays activation of the time delay so that the joint locator…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.