Application of FORM-A-SQUEEZE Pill Boosts Drilling, Controls Losses in Mexico Well | SLB

Application of FORM-A-SQUEEZE pill boosts drilling, controls losses in Mexico well

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Mexico, North America, Offshore

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)

The Situation

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.

The Solution

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.

  • Having the bit at 5905 ft (1800 m), 40 bbl of FORM-A-SQUEEZE pill was pumped. Pressure: 600 psi, displaced at 800 strokes per min
  • Lifted bit to 5459 ft (1664 m), circulated at a low flow rate of 10 strokes for 5 min; then pumping was suspended, annular preventor was closed, satisfactorily repressurizing with 200 psi for 10 min
  • Pressure was discharged to zero; annular preventor was opened and initially circulated at a low flow rate. The flow rate was gradually increased until initial drilling conditions were attained: 120 strokes, 540 gal/min, 2200 psi. No mud losses to the formation were observed
  • The 12¼-in section was taken to bottom, circulated at a low flow rate, increasing little by little until reaching and maintaining 540 gal/min, and continued drilling with normal circulation
Application of FORM-A-SQUEEZE Pill Boosts Drilling, Controls Losses in Mexico Well
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

The Results

After pumping the FORM-A-SQUEEZE pill:

  • A complete cycle was circulated at 540 gal/min, keeping normal levels
  • Drilled to bottom without experiencing lost circulation, keeping normal levels at surface
  • No waiting-on-cement times were required
  • Continued drilling at the scheduled depth with normal circulation
  • Waiting times were eliminated
  • Operational costs were reduced
  • Continued drilling the stage below scheduled times
“When a partial lost circulation was experienced during drilling a 12¼-in. interval, attempts to seal the loss zone were unsuccessful. Use of the FORM-A-SQUEEZE pill mixed with diesel allowed us to continue drilling, without loss, reducing time and operational costs.”
Operator Drilling Foreman
Products Used