Monodiameter wells construction: concept or the possible future

UDK: 622.24

DOI: 10.24887/0028-2448-2025-5-88-92

Key words: well construction, complication, drilling mud absorption, casing string, expandable casing pipes

Authors: A.Yu. Abusal Yusef (Ufa State Petroleum Technological University, RF, Ufa); R.A. Ismakov (Ufa State Petroleum Technological University, RF, Ufa); D.V. Silnov (Ufa State Petroleum Technological University, RF, Ufa; RN-BashNIPIneft LLC, RF, Ufa); V.V. Yadrin (RN-BashNIPIneft LLC, RF, Ufa); A.R. Gibadullin (Ufa State Petroleum Technological University, RF, Ufa; RN-BashNIPIneft LLC, RF, Ufa); B.M. Latypov (Ufa State Petroleum Technological University, RF, Ufa; RN-BashNIPIneft LLC, RF, Ufa)

The article deals with the most frequent and significant type of complications in oil and gas well construction which is incompatible drilling zones, such zones should be isolated by casing sections. The main causes of the drilling incompatibility are wellbore instability and the absorption of drilling and grouting fluids. Typically, the fields are confined to sedimentary and carbonate rock formations, such as limestone, dolomite, siltstone, and sandstone. Such complications are often due to the geological properties of the deposits. However, currently, this type of problem occurs in mature deposits where the reservoir pressure becomes lower than the hydrostatic pressure during operation. Preventing and eliminating bottom-type issues significantly increases the efficiency of well construction. The possible solution to reduce the number of intermediate columns in multi-dimensional wells is the development and improvement of technology for fixing pipes with the same diameter. This technology involves the use of expandable casing pipe sections, which maintain a constant internal diameter of the well from the top to the bottom, reducing material costs and simplifying construction logistics. The technology includes the development of casing strings made from ductile steel, as well as the use of special tools and lubricants to ensure the smooth installation of the pipes.

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