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№ 1 (January 2010)

ISOJET Technology Reduces Well Completion Time

   LLC Trican Well Service offers a new technology in the Russian market – abrasive jet perforation of production casing with application of coiled tubing followed by fracturing treatment.

By This article was provided courtesy of LLC Trican Well Service

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   Currently, the task of compensating the reduction of base oil output requires that new wells be brought onstream quickly, at minimum costs and high quality. This has been the exact reason why Trican Well Service developed and implemented ISOJET technology.

   The technology is based on continuous operation of the coiled tubing (CT) fleet, which – apart from its main functions – also performs abrasive jet perforation jobs, and the frac fleet which performs hydraulic fracturing without limitations on proppant tonnage and other complicating factors. As a result, we have an interactive chain of consequent jobs to begin production after the well has been drilled.

   Prior to using the ISOJET perforation technology at a drilled well, a workover crew has to run and place a packer (with a bore at least 61 millimeters) above the upper bed. Then the crew leaves the site and clears the area for coiled tubing and frac fleets spotting.  Both fleets approach the well  and then run the coiled tubing equipped with an abrasive jet perforator into the well. This is followed by tagging, positioning and placing the perforator in the perforation zone. The drillstring is then neatly cut within the pay bed interval. After retrieving the perforator from the well a hydro frac can be performed. In case there is more than one formation, a backfilling job needs to be done during the frac by means of underflush to required depth. These operations are then repeated at the next formation. After completing all fracs in the well, the CT fleet performs the cleanout and completion.

   This technology is particularly relevant and applicable at virtually any kind of well in West Siberia. Neither the large curvature, nor the lack of reinforced drillstring, nor the presence of 102- or 114-millimeter liner in the string assembly can limit its application. The only condition for applying ISOJET technology is the parent string no less than 146 millimeters.

Fewer Trips, No Downtime
   The technology is particularly relevant for multiple-zone wells and wells with a non-standard string (i.e. a 146-millimeter string with a 102-millimeter liner). Due to the fact that the packer makes no extra trips, perforation times are shorter, and there is no downtime that occurs while waiting on a workover or logging crew (all these jobs are performed by Trican Well Service), the well completion period is significantly reduced and the well is put into operation faster.

   Up until now the ISOJET application has been used in 11 fracs performed on four wells (on average three fracs per well) at A oilfield in West Siberia. At one of those wells ISOJET was used in a drill string with a 102-millimeter liner.  

   Compared to a conventional technology of well completion which includes well preparation, the frac, well cleanout, running and rig-up of an electric submersible pump at three-zone wells and takes 30 to 32 days, the ISOJET-based frac allows you to complete a well within 18-20 days.

   It should be noted that this technology is quite new. Our first job with the ISOJECT application was performed in August and we have continued using this technology since.  
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