Everybody believes to drill a well, it is obviously necessary to use Drill Pipe. Pemex Exploration and Production (PEP) has drilled with Tubing more than a 150 gas wells since June 1996. Now PEP went further, cause PEP already drilled with 5 ½" Casing Hydril Series 500 Type 521, the gas well Culebra 281 in the area of Burgos Basin in Reynosa, Tamaulipas, Mexico.

This Mexican Technique uses the Casing as a Drill Pipe. The 5 ½" HD-521 Casing drills the first section with a 12 ¼ in. tricone bit and the second section with 8 ½ in. PDC bit. After the first section is drilled, the 9 5/8" Casing with guide shoe and float collar is run and it is cemented from the bottom to the surface. The second section is drilled with the same 5 ½" Casing to the programmed depth and finally the same 5 ½" Casing is run with guide shoe and float collar in stands in order to be cemented as an Intermediate Casing.

In both sections, the 5 ½" HD-521 Casing is rotated during drilling and it is retrieved to the surface in stands to lay down the drill bit and bottom hole assembly (BHA).

The third section and last section is drilled with 2 7/8" HD-533 Tubing, 4 ¾ in. PDC bit and 3 ½ in. Mud motor and then it is retrieved to the surface to lay down the drill bit and bottom hole assembly (BHA); finally the completion is done with the same 2 7/8" HD-533 Tubing which is run in stands with guide shoe and float collar to be cemented as a Production Casing (Tubingless Technique). The Mexican technique improves the return on investment, due to the fact, No Drill Pipe is required to drill the well and also this technique reduces drilling time and well cost.

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