A specialized hanger and wellhead system has been designed that utilizes a unique multiple slip and rubber configuration. This system delivers simple well control and safety for the final nipple up phase of the completion. The coiled tubing strings are fed through the hanger and wellhead by conventional means used in typical hang off or velocity string completions.
Because the coiled tubing used to date has been carbon steel, the reliability, cycle fatigue, and tube specifications have met industry standards and meet or exceeded any wellbore requirements. Based on pump design requirements, the umbilical can be designed to meet specific wellbore chemistry, pressure/temperature parameters, outside diameter, and tubing wall thickness. Further, there are outside diameter coatings and alternative alloys available, making this system compliant for sour applications.
The thermoplastic material used is an EPDM/Polypropylene blend that has had years of field experience in similar completion applications for coating control lines for Subsurface Control Valves, Downhole Chemical Injection, and advanced SmartWell completion technology. The plastic has been fully tested in a variety of the standard oilfield solutions and has shown to be resilient in most applications.