Schlumberger

Case Study: The WELL COMMANDER Drilling Valve Demonstrates Its Effectiveness in Boosting Annular Velocities to Clean Hole During Long Trips Into the Well

A Sakhalin Island First

Challenge:

An operator in Sakhalin identified the need for a circulating valve to boost annular velocities and assist in hole cleaning during drilling operations. The Schlumberger Drilling & Measurements Project Engineer consulted the M-I SWACO manager of Specialized Tools (ST) and between them quickly decided that the WELL COMMANDER drilling valve would be ideal for the application. There was a lack of bed space on the rig for a ST engineer because additional mud engineers were on board at the time to take care of a new mud system.

Solution:

The local ST project engineer contacted the Schlumberger D&M office and arranged a meeting with the Directional Driller (DD) and Drilling Engineer to talk through in detail the operating guidelines for the WELL COMMANDER drilling valve. Once the DD had been thoroughly briefed, he underwent the M-I SWACO in-house WELL COMMANDER competency questionnaire to demonstrate his working knowledge of the tool.

Result:

The WELL COMMANDER drilling valve was positioned above the drilling BHA to mitigate drilling hazards and to boost annular velocities as and when required. The tool was successfully functioned at 80┬░ inclination. Several hi-vis and weighted sweep pills were pumped through the WELL COMMANDER ports at high rates to boost hole cleaning and cuttings removal. The pump rates and annular velocities achieved while using these pills would not have been possible without the improved hydraulics the open WELL COMMANDER drilling valve provided.

Well Information
Location Sakhalin Island, Russia
Rig Type Platform
Tool Type 8 1/4” WELL COMMANDER drilling valve
Hole Inclination 80°
Depth 17,608 ft (5,367 m)
Drilling Fluid 1.25 s.g. (10.4 lb/gal) low toxicity oil-based mud

The Details

The WELL COMMANDER drilling valve was run in the hole and functioned a total of six times; all within expected parameters.
  • Circulating rate: 1,328 lpm / Stand Pipe Pressure (SPP): 324 psi
  • Dropped ball to open WELL COMMANDER tool – shear observed at 1,800 psi
  • Circulating rate: 1,328 lpm / SPP: 127 psi
  • Dropped ball to close WELL COMMANDER tool – shear observed at 1,400 psi
  • Circulating rate: 1,328 lpm / SPP: 328 psi
  • RIH to TD
  • Dropped ball to open WELL COMMANDER tool – shear observed at 2,000 psi
  • Circulated three weighted / hi-vis pills at 4,760 lpm / SPP: 4,450 psi. Significant increase of cuttings at surface (up to170% of normal drilling rate)
  • Dropped ball to close WELL COMMANDER tool – shear observed at 1,725 psi
  • Continued with operations as planned
  • Dropped ball to open WELL COMMANDER tool – shear observed at 1,943 psi
  • Circulated one weighted / hi-vis pills at 6,000 lpm / SPP: 2,000 psi. No increase of cuttings at surface. (Taken as evidence that the hole was clean)
  • Dropped ball to close WELL COMMANDER tool – shear observed at 2,000 psi
  • Pulled out of hole.

Download: The WELL COMMANDER Drilling Valve Demonstrates Its Effectiveness (0.32 MB PDF)

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