Application of Ultra-Heavy Oil Well Completion Technique in Heat Insulated Casings

Abstract

The best is to read these instructions and follow the outline of this text. To improve the injection steam enthalpy is the key technology in ultra-heavy oil thermal development. The wellbore heat insulation technology is needed to keep the process of steam injection hot enthalpy, to reduce heat loss utmost, to prevent the damage of the casings and cement mantle in high-temperature steam. The conventional cased-hole completions require the borehole thermally insulating insulation technology in thermal recovery, and generally adopt insulated tubing steam injection, ordinary tubing transfer pumping, which will cause frequent operations and enlarge the accidental risks caused by a number of down hole tools which are tripped in wellbore. Insulation casing well completion technology can effectively solve the wellbore insulation problems, and improve the casing and cement mantle security, increase the production rate. The field applications in Henan Oilfield have obtained excellent results; two wells were operated with completion technique by heat insulated casings. Compared with the same types of wells in the pilot test ultra-heavy oil block, the production is about twice as much as those of other wells, and the economic effect is obvious.