Technologies for increasing ability to transfer axial weight on drilling bit while sliding with downhole motors

UDK: 622.243.2
DOI: 10.24887/0028-2448-2021-12-24-29
Key words: transferring axial weight on the bit, friction factor, downhole motor
Authors: O.V. Muratov (Gazpromneft STC LLC, RF, Saint-Petersburg), S.S. Rublev (Gazpromneft STC LLC, RF, Saint-Petersburg), A.Ya. Zakirov (Gazpromneft STC LLC, RF, Saint-Petersburg), A.I. Madyarov (Gazpromneft STC LLC, RF, Saint-Petersburg)

Increasing rate of penetration and length of reservoir section are ones of the main challenges for oil industry. Difficulty with transferring weight on the bit while sliding leads to decreasing rate of penetration and horizontal section length. Currently there are several methods available to increase ability to transfer weight to the bit. This article describes some methods used while drilling wells of Gazprom Neft. Such methods as decreasing friction factor by using special lubricant or oil based mud, decreasing friction factor by using special surfacing on the drill pipe and well profile optimization. It was concluded that using lubricants and oil based mud in general case gives higher effect than surfacing on drill pipe or possible well profile optimization. According to the analyzed data, a borehole cleaning affects friction factor and ability to transfer weight to the bit so by choosing optimal drilling parameters that is possible to increase transfer weight to the bit. Also by improving drill string resistance to buckling also helps to prevent drill string buckling. This resistance can be achieved by optimizing drill string designs so drill string design plays big role in ability to transfer weigh to the bit. All these methods can help to increase the ability to transfer weigh on the bit while sliding, the rate of penetration, and the length of reservoir section respectively.

References

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