Sea Technology

APR 2017

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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16 st / April 2017 www.sea-technology.com tor or pumpdown. With the full-bore access to the lower completion or formation when the retrievable assembly is removed, coiled tubing can be used to remove sand plugs, pump acid or pump fracturing fluids to clean up or stimulate the wellbore. The live well intervention also enables deployment with no need for pump- ing kill fluids. This pro- vides added cost savings and ensures there is no reservoir damage. Case Study, Nigeria AccessESP installed the first rigless ESP con- veyance system in Nige- ria in the Ukpokiti Num- ber Four offshore well January 2014. The instal- lation was performed using the Access375 se- ries, 190 HP PMM and wet connector system. The ESP system was de- ployed through 4.5-in. tubing on conventional 0.125-in. slickline after installation of the tubing string. The Ukpokiti Number Four system was deployed via slickline to a depth of 5,900 ft. and took less than 15 hr. to install. AccessESP delivered a flexible solution tailored to the company's specific needs in this region. Case Study, Alaska In only two days, through a live well intervention, the Ac- cessESP system enabled retrieval of the existing ESP pump and the install of a newly optimized ESP pump using only a slickline unit, lubricator and a crane, marking the indus- try's first ESP pump swap on a commercial well, in October 2016. Surface diagnostics determined that the Access375 PMM was fully functional, therefore replacement was not required, thus reducing operational time and costs. In this case, the ESP pump had not failed but showed signs of wear and tear; therefore, it was proactively replaced with an op- timized pump. This would have been cost prohibitive using a workover rig, requiring the replacement of the entire con- ventional ESP system. To resize a conventional ESP pump, the operator would mobilize a workover rig, kill the well, pull the tubing and ESP and then replace the ESP and rerun the tubing. Rig avail- ability is limited in this challenging location, and the time to replace a standard ESP pump can be up to six months. This typically performed on an as-needed basis and require a short approval process given the low cost, low HSE risk and routine operation. Mobilization of equipment and person- nel can be performed in a matter of days, or hours, if rel- evant equipment and personnel are available on board. In summary, the permanent completion and the slickline retrievable ESP system together represent a dependable, lightweight and robust system to carry out rigless ESP re- placements both offshore and onshore. The lightweight as- pect allows for slickline deployment and the short length for easy lubricator deployment. To reach the target installation depth in wells with high deviation and installation depths beyond reach of typical slickline operations, the system has been implemented using coiled tubing, wireline trac- (Left) The retrievable assembly of the AccessESP system. (Right) An illustration of the permanent completion system of AccessESP.

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