Geolog - Surface Logging

GEOCVM

For the first time Mud Logging accurately measures the volume of the cuttings coming out of the hole

EQUIPMENT and PERSONNEL

One tray is positioned in front of each shale shaker to measure the weight of the cuttings and to calculate the hole volume
No modification to the rig
One Specialist is added to the crew

Onshore

Offshore

APPLICATIONS

To optimize the drilling efficiency
To measure, in real time, the volume of cuttings coming out of the hole
To detect, in real time, borehole stability problems (caving)
To detect, in real time, borehole cleaning problems
To see, in real time, whether the actions taken to correct borehole stability and hole cleaning problems are effective
To safely drill horizontal wells and extended reach wells by controlling at all times the status of the hole cleaning
To modify drilling program and or procedures to improve efficiency
To assess cement volume needed when no caliper log is run before a cement job

OPTIONAL
Secure real time data transmission via Internet using Wellcoms.

03-08-09 (Report from 06:00 to 06:00)

Drilled from 6,699 ft to 7,836 ft.
During drilling in sliding mode the retrieved volume of cuttings is less than expected, however the volume of cuttings retrieved during rotary mode makes up in terms of total cutting recovery, creating a balance with the theoretical cuttings quantity.

Drilling anomaly detected

WIDE CASE HISTORY

01-08-09 (Report from 06:00 to 06:00)

Start drill 12 1/4” phase from 5,492 ft to 5,631 ft (last data depth 5,610 ft) during the drilling in sliding mode of first stand the retrieved cuttings is lower than theoretical, the missing volume has been retrieved during the drilling of the second stand in rotary mode.
· Volume drilled hole (theoretical): 17.1 bbl
· Volume retrieved cuttings (from GeoCVM): 17 bbl
· Volume missing: 0.1 bbl

Large peaks (after every stand connection).

When drilling in sliding mode, the hole cleaning is often insufficient.
However, the practice of reaming the stand just drilled, enables the cutting recovery. The spikes observed here are proof that the reaming of the stand is necessary and sufficient to keep the hole clean.
• Volume drilled hole (theoretical all phase): 340.2 bbl
• Volume retrieved cuttings (from GeoCVM): 345 bbl
• Volume in excess: 4.8 bbl

Different hole cleaning while Sliding / Drilling

Effective hole cleaning when Reaming stands at PC

Drilled from 8,817 ft to 9,680 ft.
During drilling in slide mode the amount of the retrieved cuttings is less than normal, however during the circulation on bottom and back reaming to shoe, the missing cuttings were retrieved.

This example is analogue to the previous one, in this case shown via the cumulative cuttings return log. The “stepped” curve identifies the fact that some of the cuttings returns are occurring at pipe connections.
• Volume drilled hole (theoretical all phase): 609.9 bbl
• Volume retrieved cuttings (from GeoCVM): 636.7 bbl
• Volume in excess: 26.8 bbl

Drilled from 9,680 ft to 10,424 ft.
A wiper trip damages the wellbore, and during the circulation more than 12 m3 of cavings are recovered. CVM provides indications that the Wiper trip is causing damage.
· Volume drilled hole (theoretical all phase): 712.1 bbl
· Volume retrieved cuttings (from GeoCVM): 861.9 bbl
· Volume in excess: 149.8 bbl

Reaming stands while Sliding cleans the well

A wiper Trip causes damage to the wellbore, with excessive cavingfs being produced.

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