Abstract

The Bakken offers the largest potential for technically recoverable reserves in the US; that potential has increased because of new practices utilizing multi stage frac operations. Many Bakken wells have long cased horizontal sections up to 10,000 feet with composite plugs/frac ports set at 500-1000 ft intervals allowing greater fracture uniformity along the producing horizontal section. After frac, current practices dictate that the well must be cleaned and the plugs milled to facilitate maximum future production. This operation has frequently been accomplished using coiled tubing alone. However, the length of the horizontal section of these newer wells frequently results in some plugs being left behind in the well due to CT's inability to perform operations at or near TD. An improvement to current practices would be to utilize a coiled tubing tractor to clean out and mill the remaining plugs past the reach boundaries of CT alone. This new practice was implemented successfully on two wells in the Bakken resulting in fewer plugs (zero plugs in one case) left in the well and increased future production. The case histories of these two wells along with lessons learned are described.

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