Method of monitoring core sampling during borehole drilling

Details Method of monitoring core sampling during borehole drilling Method of monitoring core sampling during borehole drilling

1989-08-25

1991-04-30

Chapman, John

Measuring and testing

Borehole or drilling

Downhole test

7386444, 175 40, E21B 4900

Patent

active

050107658

ABSTRACT:
Downhole measurements are made for accurately determining whether or not a core barrel contains an appropriate amount of core sample before retrieval of the coring tool is attempted. This is accomplished by using a known apparatus for measuring downhole weight on bit (WOB) at the beginning of a coring run to make a first measurement corresponding to the weight of all drillstring components suspended below the measurement point at a selected depth. Thereafter, the coring tool drills down the length of the core barrel. When sufficient drilling takes place to obtain a core, the drillstring is pulled up to the same depth as the measurement and a second measurement is taken. After correcting the data for temperature changes, the difference in between the first and second measurements is obtained and compared to a calculated weight for a full core. If the difference in measurements is less than the calculated full core weight, then it is known that a full core has not been obtained and the coring operation is continued. However, if the difference in the measurements does correspond to the calculated weight of a full core barrel, then the drillstring is retrieved and the acquired core sample is obtained.

REFERENCES:
patent: 4875530 (1989-10-01), Frink et al.

Affiliated with

Also associated with

Rating

Method of monitoring core sampling during borehole 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 Method of monitoring core sampling during borehole drilling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of monitoring core sampling during borehole drilling will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-633324