Sidetracking process parameters affecting profile liner running operation

UDK: 622.24.085.22
DOI: 10.24887/0028-2448-2019-7-20-23
Key words: side track, deviation angle, horizontal angle, spatial angle, radius of curvature, effective size, profile liner
Authors: A.A. Mukhametshin (TatNIPIneft, RF, Bugulma), F.F. Akhmadishin (TatNIPIneft, RF, Bugulma), K.A. Ratanov (TatNIPIneft, RF, Bugulma), A.L. Nasyrov (TatNIPIneft, RF, Bugulma)

This paper presents theoretical research of sidetracking process parameters affecting a profile liner passing through the hole, as well as allowable axial loading when running it to the setting depth to isolate a trouble zone. The highest number of troubles during sidetracking and horizontal sidetracking in the Romashkinskoye field (Tatarstan) is encountered in Kynovian mudstones having thickness up to 30 m. These troubles include rock sloughing, caving, hole shoulders at point where soft rock changes to Kynovian hard-rock deposits, as well as disastrous lost circulation zones. Isolation of such zones by LCM or cement squeezing is material intensive and time consuming, and in most cases these actions are unsuccessful. All these troubles become nearly unmanageable in high buildup and drop-off sections, or when adjusting the sidetrack direction and drilling a horizontal section due to specific operation of a bend motor resulting in numerous breakouts and shoulders, and due to small hole size. Sometimes profile liners that were run to isolate the trouble zones could not pass through such hole sections. The profile liner had to be run out of hole, the well was underreamed, and then the profile liner was run in hole again, which resulted in drilling time and cost growth. Based on research data and analysis of best practices in isolating trouble zones with profile liners, guidelines are provided to improve sidetracking process parameters, which will enable easy running of the profile liner to the setting depth, thus saving time and money.


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