Study and Application of Integrated Fishing Technology for Logging Instrument Set of SN0144i-XX Small Well
Well SN0144i-XX is a small borehole in carbonate reservoir of Majiagou Formation.The completed drilling depth of well SN0144i-XX is 3 805 m,the open hole length is 3 040 m,the maximum well deviation is 24°,the maximum dogleg degree is 4.05°,and the drilling fluid density is 1.16 g/cm3.The Φ57 mm logging instrument fell into the well during the process of wellhead lifting.Due to the small size of the hole and instrument,the complex structure of the instrument string,the limited tensile and compressive parameters of the instrument string,and the unknown state of the falling instrument,etc.,conventional fishing technology cannot meet the fishing requirements of Φ57 mm logging string in Φ152.4 mm small hole.Therefore,through the analysis on the logging instru-ment structure,the relative position and status of the well instrument structure and the fallen fish in the well in each trip,the study on the design and production of the special fishing tools and the formulation of the fishing scheme was carried out.By using magnetic po-sitioning instrument to determine the fish head technology,accurately determine the location of the fish head,and improve the fishing success rate of the instrument,a set of integrated fishing tools was designed and produced,including Φ146 mm large guide shoe+Φ110 mm Salvage barrel,Φ143 mm milled head steel wire+embedded Φ110 m slip socket,Φ143 mm milled tube window+em-bedded Φ110 mm slip socket and other sets of fishing integrated fishing tools.And then 26 continuous fishing operations were carried out,which took 45 days to pull out the instrument string of 19 m.This paper describes the design and processing of the integrated un-conventional fishing tool,the drafting of the fishing plan and the key fishing measures,which can provide some technical reference for the unconventional fishing operation of similar logging equipment in the future.
small holeopen hole welllogging instrumentset of integrated fishing toolfishing technique
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