This paper will address and discuss the planning and operational challenges encountered in non-routine wellwork operations / well interventions in ExxonMobil Exploration and Production Malaysia Inc. (EMEPMI) oil and gas fields off the east coast of Peninsular Malaysia.

The introduction will provide a brief overview of EMEPMI wells, typical conventional workover rig (CWR) and non-rig wellwork operations such as coiled tubing operations, well servicing and wireline/slickline work. Subsequently, case examples will describe the planning and execution of non-routine non-rig wellwork operations, namely:

  • Coiled tubing milling of tubing retrievable surface controlled subsurface safety valve (TR-SCSSV) dislodged flapper,

  • High angle coiled tubing operations; static bottom hole pressure (SBHP) survey, setting tubing plug and sleeve shifting at well angle in excess of 75°,

  • High angle coiled tubing operations; setting through tubing inflatable packers at 88° well angle,

  • High angle well interventions with slickline; slickline fishing, and

  • Hot tap milling of stuck closed production casing x production tubing annular (B Section) wellhead valve.

Finally, the conclusion of this paper will share general lessons learned from the case examples in terms of applying best practices, planning the work and executing the work.

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