Method and assembly for determining landing of logging tools in a wellbore

摘要

An assembly using an onboard controller employs sensors to precisely determine the landing status of downhole logging tools. A control algorithm of the onboard controller can enable an intelligent management of the battery system and memory system of the logging tools. Sensors are used to verify landing having been reached. The sensors may include a real time clock, a pressure sensor, a temperature sensor, and a proximity/position sensor. The sensors can send measurement signals to the controller for determining if the measurement values are within an acceptable range indicating the logging tools having landed. As a correct landing has been confirmed or verified, the controller can trigger an onset for data logging (e.g., powering up the battery system and/or memory system). A method of determining landing of a logging tool in a wellbore is disclosed.

主权项

1. A method of determining landing of a well tool comprising:
(a) running a drill pipe string having a longitudinal bore into a well bore to a predetermined position, said drill pipe string including a landing sub disposed proximal to a lower end of the drill pipe string; (b) inserting a logging tool string into a proximal upper end of the longitudinal bore of the drill pipe string, said logging tool string comprising a running tool attached to a cable, a landing assembly, an onboard controller and one or more logging tools; (c) pumping a fluid into the proximal upper end of the longitudinal bore of the drill pipe string above the logging tool string to assist, via fluid pressure on the logging tool string, movement of the logging tool string down the longitudinal bore of the drill pipe string; (d) spooling out the cable at the surface as the fluid is pumped behind the logging tool string and the logging tool string is moving down the longitudinal bore of the drill pipe string; (e) landing the landing assembly of the logging tool string in the landing sub of the drill pipe string, wherein at least a portion of the logging tool string including the one or more logging tools is disposed below a distal end of the drill pipe string; (f) analyzing data from a plurality of sensors in the logging tool string with the onboard controller and determining with the onboard controller that the landing assembly of the logging tool string has landed in the landing sub; and (g) upon determining that the landing assembly has landed in the landing sub, sending by the onboard controller one or more signals to the one or more logging tools in the logging tool string.