REMOVING CEMENT STRINGERS WITH NEW TECHNOLOGY

Background

A Canadian operator has been using cemented liners with sleeves as their primary completion method in Saskatchewan. To ensure a trouble free fracking operation they were performing ‘confirmation runs’ prior to completion to ensure the wellbore was free of cement stringers. These were being performed using CT with rotating scraper, mill and magnet. The wells were completed with 4½” cemented liners incorporating up to 24 sliding sleeves per well. At the opportunity to perform this clean-out in one run without the use of fluids, the operator agreed to trial the Well Cleaner® RCB. The results convinced them to make a step change from CT to Well Tractor® and Well Cleaner RCB.

Tools applied:

Well Cleaner® RCB
Well Tractor® 318

OPERATION

During the operation the Well Cleaner RCB efficiently removed the cement from the casing walls, plug back total depth (PBTD) was confirmed and the client was assured that the frac bottomhole assembly (BHA) would reach target depth and not have any NPT with an expensive frac crew on location. Since the trial, the operator has continued with the Welltec® solution on a number of additional wells, each with varying amounts of stringers; 0 – 492 ft of cement thus far.

ACHIEVEMENTS

The Well Cleaner RCB with the new Scraper Bit provided a step change for Crescent Point Energy Corp in their removal of cement stringers by offering a one-run solution. With this new capability Welltec offers multiple benefits to operators including reduced cost (~ $10k per well), significantly reduced equipment footprint, less logistics involved in the well preparation and the added value of a CCL log to surface used for both frac operations and future well intervention correlations.

WELL TYPE: 4½” CEMENTED LINER WITH SLEEVES
MAX. DEPTH: 9,843 FT (3,000 M) MD
MAX. TEMPERATURE: 131° F (50° C)
MAX. DEVIATION: 90°

 

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THE WELL CLEANER RCB WITH THE NEW SCRAPER BIT PROVIDED A STEP CHANGE FOR CRESCENT POINT ENERGY CORP IN THEIR REMOVAL OF CEMENT STRINGERS BY OFFERING A ONE-RUN SOLUTION.