Perm region has its long-time oil production history. Nowadays significant part (61%) of residual oil here is associated with low-productive carbonate formations. Horizontal well drilling is one of the main ways to achieve commercial success in these geological conditions. Widely spread lateral drilling has high demand on well placement service to maintain horizontal sections within the reservoir. Well placement is the process of interactive positioning of a wellbore based on real-time geological data and technological measurements. In general, horizontal drilling in Perm region is focused on three carbonate formations: Upper Devonian - Tournaisian, Upper Visean - Bashkirian and Kashirian - Werenian.
The article describes different well drilling approaches depending on each formation’s own features. At present time, lateral drilling in Perm Region is supported by geosteering service based on real-time LWD data. Paper describes LWD methods and well placement approaches which are used in Perm region. Geosteering is a proven technology that allows increasing of effective lateral length of the well despite downward geological environment: net pay decrease, high heterogeneity etc. More than 40% of annual production rate (from new wells) is based on horizontal wells landed with well placement service. Horizontal well placement brought the opportunity of profitable production for fields with complicated geology which weren’t consider earlier as a target for lateral drilling because of high failure probability.
References
1. Joshi S.D., Cost/benefits of horizontal wells, SPE-83621-MS, 2003.
2. Lebedev S.V., Sayfitdinova V.A., Kochneva S.V. et al., Geonavigatsiya v karbonatakh. Uspeshnoe primenenie tekhnologii mnogoplastovogo kartirovaniya razreza pri burenii gorizontal'nykh skvazhin (Geosteering in carbonates. Successful application of multilayer section mapping technology for horizontal wells), Proceeding of conference “Geobaykal 2018”, Irkutsk: Publ. of EAGE, 2018.
3. Lyadova N.A., Yakovlev Yu.A., Raspopov A.V., Geologiya i razrabotka neftyanykh mestorozhdeniy Permskogo kraya (Geology and development of oil deposits of the Perm region), Moscow: Publ. of VNIIOENG, 2010, 335 p.
