Apparatus for well logging while drilling

Boring or penetrating the earth – With signaling – indicating – testing or measuring – Measuring or indicating drilling fluid rate of flow

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

251137, E21B 4700

Patent

active

044050216

ABSTRACT:
A monostable, solenoid-operated valve in a passage which bypasses the drilling fluid pressure drop across a drill bit at the lower end of a drill string in a well opens and closes in response to downhole conditions to create pressure pulses in the drilling fluid. The valve is urged toward a closed position by drilling fluid pumped through the drill string. A larger force is required to open the valve than to hold it open. Current supplied to the solenoid to open the valve is thereafter reduced to a value sufficient to hold the valve open. The solenoid is de-energized to close the valve.

REFERENCES:
patent: 2769943 (1956-11-01), Matthews
patent: 2887298 (1959-05-01), Hampton
patent: 2901210 (1959-08-01), Hebard
patent: 2925251 (1960-02-01), Arps
patent: 3015801 (1962-01-01), Kalbfell
patent: 3205477 (1965-09-01), Kalbfell
patent: 3958217 (1976-05-01), Spinnler
patent: 3964556 (1976-06-01), Gearhart et al.
patent: 3983948 (1976-10-01), Jeter
patent: 4078620 (1978-03-01), Westlake et al.
patent: 4120097 (1978-10-01), Jeter
patent: 4139836 (1979-02-01), Chaney et al.
patent: 4181184 (1980-01-01), Scherbatskoy
Oil & Gas Journal, Jun. 12, 1978, p. 71, "Negative Pressure Pulse in MWD".
Oil & Gas Journal, Mar. 17, 1980, pp. 126-148, "MWD Update: New Systems Operating".

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Apparatus for well logging while drilling does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for well logging while drilling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for well logging while drilling will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-584007

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.