By Yakov Gelfgat, Mikhail Gelfgat, Yuri Lopatin
Presents unique descriptions and case experiences of the various applied sciences built and familiar 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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Extra resources for Advanced drilling solutions : lessons from the FSU. Volume 2
This is achieved by using mobile mud mixing and processing equipment that is moved with the rig within the same cluster well drilling site without the need to rearrange piping. The design of the new cluster well drilling method provides for drilling a vertical well, preferably in the center of the well cluster area. During the entire process of drilling all other wells in a cluster site, the vertical well serves as a drillstring storage system. ” It has a special design, different from all other wells in a cluster.
4. The cluster well drilling method had less impact on the environment and complied with environmental regulations owing to a smaller soil contamination area, less deforestation, and less tundra vegetation damage in the permafrost conditions. 5. , higher weight on bit, rotational speed, and mud circulating rate to achieve better drilling results compared to the mobile drilling rigs used to develop vertical wells. qxd 4/28/03 10:39 AM Page 26 ADVANCED DRILLING SOLUTIONS LESSONS FROM THE FSU TABLE 4–6 The Costs of Preparatory, Rigging-Up and Rigging-Down Works When Drilling Vertical and Directional Wells (Rubles 1972) Number Average of Wells Cost of in the One Well Cluster Drilling 0 10 20 60 59 900 68 423 72 783 94 615 Overrun of the Capital Investments per Cluster – 85 229 257 660 2 083 000 The Costs of Preparatory, Rigging-Up and -Down Works Directional Vertical Wells Wells – 91 968 183 936 551 808 – 459 840 873 696 2 759 040 Average Cost of One Well Drilling with Accounting of Preparatory Rigging-Up and -Down Works Directional Vertical Wells Wells – 77 620 82 464 186 583 – 105 884 105 884 105 884 Balance of Well Costs – -28 264 -22 420 +80 699 This last advantage prompted development of the BU-3000EUK and BU2500EUK special drilling rigs for cluster well drilling.
4–16d). In the suggested drilling method, a drillbit can only be run in combination with the PDM. If certain well intervals are to be drilled using the rotary drilling method or if operations to eliminate downhole problems are required, then the drillstring (5) section resting on the support structure is disconnected from the drillstring section in the borehole at the wellhead (7). The latter drillstring section is attached to a swivel and a kelly, and the required operations are performed in accordance with standard procedures.