REPSOL Casing Extension & Wellhead Replacement Project
Following is a set of photos and descriptions pertaining to onsite work completed by Hot-Hed S.A. in Neuquen Argentina for REPSOL. To view a gallery of full size images related to this project, click on the thumbnails. Please note you must have JavaScript enabled for the image gallery to function.

REPSOL requested that Hot-Hed recondition an oil well that was abandoned many years ago using the method that was widely available and accepted at that time. Abandonment of the oil well was originally completed by pumping cement over the cellar until the top of the casing was covered.

Hot-Hed has now gone back in to repair the problematic wells by cementing them in the currently accepted manner of well abandonment - from the inside out. In order to fulfill current standards of oil well abandonment, old cement was removed and new casing was added to the older casing to extend its length sufficiently for the cementing equipment and tools that were used.  REPSOL also requested that Hot-Hed clean the existing oil well, extend the casing, install a wellhead and tighten (nipple-up) the union between the 9 5/8" wellhead and the 9 5/8" to 7" reducer.  All of the tasks were done with a 'cherry picker' style crane and ultra-portable equipment (i.e. Diesel Welding Machines and Air Compressors, etc.) that make these types of projects possible without the use of a derrick.

Hot-Hed S.A. will be called out when the project is completed to nipple-down the sections that were installed and to recuperate the wellhead for future use.

At this point the well was handed over to Hot-Hed. Crews broke out the remaining cement with a pneumatic chisel (jack hammer), removed the pieces and cleaned the casing for reworking.
Sealing the gap between the two outer casings.CAPPING 13-3/8" CASING AND SEALING TO 9-5/8"

A ring shaped piece of flat iron is used to seal the gap between the two outer casings. In this project they are the
13-3/8" and the 9-5/8".
Hot-Hed crew measuring the casing.MEASURING TWICE…

Hot-Hed crew marking the 9-5/8" casing for the final cut.
Hot-Hed crew separating the casing in preparation for beveling.SEPARATING THE 7" CASING FROM THE
9-5/8" CASING

Hot-Bevl'r beveling band in place where the cut will be made.
Hot-Hed crew preparing the casing for extension.EXTENSION IN PLACE

7" casing extension is ready to be welded together.
9-5/8" casing beveled and ready for extension.
Hot-Hed crew leveling the casing prior to extension.LEVELING THE 7" CASING

Assuring that the 7" casing is absolutely level is essential to the success of the extension project as a reducer will unite the 9-5/8" section and the 7" section.
Welding the casing and extension piece together.WELDING THE 7" CASING

Welding the 'old' (existing) 7" casing and the new extension piece that was cut to size in the field
Casing is extended and welded together in preparation for the wellhead.EXTENDING THE 9-5/8" CASING

The 9-5/8" casing is extended and welded in place according to the desired height planned for the wellhead which will be installed.
Wellhead installation process begins.LOWERING THE WELLHEAD

9-5/8" wellhead is lowered onto the
9-5/8" casing in preparation for welding and wellhead installation.
Hot-Hed crew leveling the wellhead.LEVELING OF THE WELLHEAD

Once wellhead is in the correct position, is is essention to ensure that it is perfectly level so that the extension inside will be absolutely centered.
Leveled wellhead being tack-welded into place.WELLHEAD WELDING

The 9-5/8" wellhead already leveled and being thouroughly tack-welded in place; wellhead is then welded securely to the 9-5/8" casing.
Hot-Hed crew installing the packer in the wellhead.INSTALLATION OF PACKER

Packer is placed in the anulus of the
9-5/8" wellhead.
Hot-Hed crew installing the wellhead reducer.INSTALLATION OF REDUCER

With packer and steel ring in place, the 9-5/8" TO 7" reducing head is lowered into place.
Bolts being installed. Hydraulic torque equipment is used to tighten the wellhead nuts.NIPPLE UP

Final step in process: bolts are installed and wellhead nuts are tightened with hydraulic torque equipment.
To download a copy of the REPSOL YPF Casing Extension and Wellhead Replacement Project for Re-abandonment of Oil Well at Barrosa Oeste #41, choose a link below.

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