By Yakov Gelfgat, Mikhail Gelfgat, Yuri Lopatin
Presents special descriptions and case reviews of the different applied sciences constructed and customary 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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Example text
The dimensions of the embankment that were formed matched almost exactly the design parameters including the embankment height above the bog surface level. Tests performed on the embankment soil density indicated that a drilling rig and other drilling facilities could be rigged up on it. The test work was carried out in the summer months. At that time, one of the main objectives of the drilling industry was a cheaper and faster way to build drilling locations on the Caspian Sea shelf; therefore, some experimental work was carried out at the north coast of the Apsheron peninsula.
The experience in cluster well drilling using this rig moving technique indicated that, as the number of wells on a location increased, moving a derrick and drilling equipment further away from the circulation block was a complicated and time consuming process, especially in the winter months. This involved a large amount of work related to extending and heat tracing mud pump discharge lines and well flow lines. In addition, rearrangement of the rig module layout complicated operating and servicing of drilling equipment and affected the working conditions of the rig crew.
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.