Abstract

In view of ever-increasing activities associated with lateral-hole and horizontal sidetrack drilling from existing wells, success rate of such operations was analyzed. This analysis enabled to reveal the cases when drilling assembly failed to pass through a window cut in the casing wall. In order to determine the main factors affecting the passability of drilling assemblies and liners through casing windows a number of casing exit technologies and tools available from foreign and Russian companies were reviewed. Graphic analytic method allowed to analyze configurations of casing windows cut using various wedge-shaped whipstocks. Wear limit of whipstock body during casing exit operations was determined. Recommendations for improvement of casing exit tools and technologies are provided to increase the success rate of sidetracking operations.

Key words:

casing window, sidetrack, deflection surface, groove, whipstock, milling cutter, drilling tool, liner (casing string)

References

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Authors

For citation:

A.A. Mukhametshin, A.L. Nasyrov Opyt vyrezanija okna v obsadnoj kolonne skvazhiny pri pomoshhi klin'ev s razlichnoj konfiguraciej otklonjajushhej poverhnosti [Casing exit operations using whipstocks with Different configurations of deflection surface]. Neftyanaya Provintsiya, No. 3(23), 2020. pp.164-180. DOI https://doi.org/10.25689/NP.2020.3.164-180 (in Russian)