In the effort to reduce costs, many companies are investigating the cost effectiveness of completing some types of workover operations without removing the production tubing. These operations include scale removal, frac sand removal, squeeze-reperfing, underrearning and junk/fish removal. All of these operations are currently feasible using either slimhole work strings or coiled tubing in conjunction with slimhole PDM's. This paper describes the tools and procedures used to complete these operations and compares their cost effectiveness with conventional operations. A section is included on new tools being developed which should broaden the scope of these operations. The paper concludes that slimhole workover drilling operations can provide sub-stantial economic benefits compared to conventional workover methods.

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