By Yakov Gelfgat, Mikhail Gelfgat, Yuri Lopatin

ISBN-10: 0878148914

ISBN-13: 9780878148912

Presents precise descriptions and case reports of different applied sciences constructed and prevalent in Russia. There are directional drilling, deep and ultra-deep good building, underbalanced drilling, rotary-turbine drills, underreamers, and retractable drill bits.

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Fig. qxd 4/28/03 10:39 AM Page 22 ADVANCED DRILLING SOLUTIONS LESSONS FROM THE FORMER SOVIET UNION TABLE 4–5a First Cluster of Directional Wells Drilled at Ust-Balyk Oilfield, West Siberia (trajectory) Borehole Length Well ## Kickoff Magnetic Inclination Bottomhole Point, Azimuth Offset, m m Degree, Project Actual Project Actual 771 772 811 812 773 390 454 440 834 976 375 519 422 865 1040 1511 516 130 100 100 97 7 248 292 341 100 4 247 289 343 Built-up Angle, deg-min Project Actual 22°30' 18° 17° 24° 27° 34° 21° 17° 26°30' 34°15' Tangent Section, Section, m m 211 91 170 215 405 508 1653 1930 2012 1935 Length TVD, m Ext.

When all the wells on a cluster have been drilled and completed, including the central well, the entire unit is rigged down and moved to another location. On a cluster with a large number of wells, the support structure may be left for use in well workover and downhole repair jobs. In this case, the central well is not completed for production, but a regular development well is drilled next to it. A rough calculation was made of the Western Siberia conditions to assess the potential economic efficiency of the method.

A typical example was the Starogroznensky oilfield developed by the Grozneft Company. The Starogroznensky fold featured an anticline stretched in a 10–12 km latitude direction. The northern limb of the fold was lowered beneath the southern limb and rolled up to form the sub-thrust fault (Fig. 4–17). Layers of the northern limb rolled up almost vertically and formed an irregular bedding and broken clay zone—the “wedge” between the thrust fault planes. The sub-thrust section along the entire fold was not a single piece but rather a group of separate blocks.

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Advanced drilling solutions : lessons from the FSU. Volume 2 by Yakov Gelfgat, Mikhail Gelfgat, Yuri Lopatin

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