Operator:	Merit Energy
Well name:	Pfeiffer 15-26
Date run:	March 20, 2007
County:	Weld
State:	CO
Company Man	Ron Singleton
Cell number:	(970) 534-0031
Well Type:	Oil & Gas
Location: Sec	26-T6N-R64W

Objective: The operator wanted to squeeze the holes between 3,504 – 3,567 Ft. below the Composite Cement Retainer, with the hope that the cement would come up around the outside of the pipe and re-enter the casing through the holes between 3,413 – 3,444 Ft. Immediately following this squeeze, the operator would sting out of the retainer, trip out of the hole, and then pump cement down the casing, followed by a wiper plug to squeeze the holes between 3,351 – 3,383 Ft

• March 20, 2007 – 12:30 PM: The Composite Cement Retainer was run into the well, on wireline, and set at 3,504 Ft. The Wireline running speed was 194 Ft / minute. The Cement Retainer Stinger was tripped in on 2-7/8” tubing and landed at 1:30 PM. Shut down for the day.
• March 21, 2007 – 9:00 AM: The operator began pumping cement through the Composite Cement Retainer maintaining 2,000 lbs of tubing weight on the retainer. At this point, the retainer had been on depth, at temperature, for 19.5 hours. The maximum applied pressure was 70 psi. After squeezing the bottom holes, the tubing was tripped out and cement was then pumped down the casing followed by a wiper plug. The well was shut-in when the pressure on the plug reached 360psi.
• March 21, 2007 - 2:00 PM: The operator pressure tested the casing to 500 psi. No leaks. Tripped in with a 3-5/8 Tri-cone bit and tagged the wiper plug 185 ft. above the Composite Cement Retainer.
• They drilled the cement down to the top of the Composite Cement Retainer and stopped to pressure test the casing to 600 psi. No leaks. Drilled through the 185 ft. of cement averaging 30 minutes per joint while reverse circulating.
• Resumed drilling on the top of the Composite Cement Retainer. It took 1 hour to drill down through the bottom set of slips to the top of the aluminum-sliding sleeve valve housing, approximately 21- 1/4”. At this point the bit quit drilling. Tripped the bit. The center rows of teeth on the each of the 3 cones of the Tri-cone bit were worn off. Tripped in with a new Tri-cone bit and finished drilling the valve assembly housing, approximately 11-3/4”, in 60 minutes. Total drilling time was 2 hours.
  
  
  

• The Composite Cement Retainer performed flawlessly, in spite of the fact that the retainer sat on depth at 180 degrees F for 19-1/2 hours before cementing operations began. The manufacturer recommends that the retainer be set and cementing operations are completed all in the same day. So, this was a good test of the durability of the composite material.
• The sliding sleeve valve performed as expected. The valve opened and closed and held pressure as designed.
• The only downside was the operator’s choice of the type of bit to drill up the cement and the retainer. A Tungston Carbide Drag bit, Hurricane mill, or Chomp mill would have been a better choice, both in terms of durability and faster drill times. Based on field experience, the Composite Cement Retainer should have drilled up in 1 to 1-1/2 hours with either of these alternative bit choices.