Prevent lost circulation in fractures, vugular formations, matrix, and underground blowout events.
Challenge: Partial lost circulation at a rate of 11 m3/hr (69.2 bbl/hr) was observed.
Solution: Use of a FORM-A-SQUEEZE pill to seal the zone where the partial lost circulation occurred.
Results: Waiting times were eliminated and operations costs were reduced.
Well Information |
|
Location | Bay of Campeche, Mexico |
Fluid type and density | VERSADRIL invert-emulsion, density of 1.30 SG (10.8 lb/gal) |
Interval drilled | 12¼-in hole, interval of 3674 ft (1120 m): 2657–6660 ft (810–2030 m) |
Temperature at loss depth | 198°F (92°C) |
Drilling was being performed with a 12¼-in bit at 5853 ft (1784 m) with 1.30 SG (10.8 lb/gal) VERSADRIL invert-emulsion fluid and partial lost circulation at a rate of 11 m3/hr (69.2 bbl/hr) was observed. Pills containing 100 kg/m3 (35 lb/bbl) of lost circulation materials (LCM), M-I-X II Medium and CaCO3 M-70 and M-200 were pumped.
Drilling was continued with a partial loss of 5 to 11 m3/hr (31.4-69.2 bbl/hr) to a depth of 5,938 ft (1810 m) while pumping LCM pills, accumulating 110 m3 (692 bbl) of lost mud, resulting in suspension of the operation.
Client operating personnel met with SLB engineers in search of a technical alternative to properly seal the loss zone and to continue with normal operations.
SLB recommended the use of a FORM-A-SQUEEZE pill to seal the zone where the partial lost circulation occurred. A 50-bbl, 1.31 SG (10.9 lb/gal) FORM-A-SQUEEZE pill consisting of diesel, FORM-A-SQUEEZE additive, and calcium carbonate was prepared and blended.
Time (min) (ft) | Pressure (psi) | Bbl |
2.5 | 50 K | 1.6 |
5 | 100 | 3.2 |
7.5 | 150 | 4.8 |
10 | 200 | 6.4 |
15 | 150-200 | 7 |
Time (min) | Pressure (psi) | Bbl | Remarks |
10 | 150-200 | 7 | Pressure was kept constant |
After pumping the FORM-A-SQUEEZE pill: