By Yakov Gelfgat, Mikhail Gelfgat, Yuri Lopatin

Presents precise descriptions and case reports of the different applied sciences built and well-known 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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Additional info for Advanced Drilling Solutions: Lessons from the Fsu Vol 2

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Even if they hit the target, there was a risk of borehole deviation from the designed trajectory into the nearby soft clay stringer, which would make the back entry of a bit into hard sandstone at zero entry angle impossible. 3. Vertical wells could not be drilled in the reservoir from the designed elevation in the oil-bearing zone. These wells would penetrate through the pre-arch gas-bearing zone, which would increase the gas-to-oil ratio of the produced oil and lead to premature depletion of reservoir energy.

The system could be used inside the tubing string of producing wells and for accurate measurement in high latitudes where conventional directional survey tools could not provide the required degree of measurement accuracy. Table 4–3 shows operational characteristics of these systems. qxd 4/28/03 10:39 AM Page 16 ADVANCED DRILLING SOLUTIONS LESSONS FROM THE FSU 1–wireline drum 2–readout and surface processing unit 3–side entry sub 4–safety sub 5–drillstring 6–downhole probe inside the orienting sub 7–bypass valve 8–PDM 9–stabilizer 10–drillbit Fig.

1–drillbit 2–bit stabilizer 3–nipple sub 4–driven shaft 5–bearings 6–bearing housing 7–hinged joint 8–bent sub 9–turbine section 10–top sub with landing knives The results of drilling these cluster wells proved the possibility of successful utilization of the cluster well drilling method to develop the entire field (Tables 4–5a and 4–5b and Fig. 4–10a, 4–10b, and 4–10c). 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.

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