ON THE ISSUE OF PREPARING THE WELLBORE FOR ITS FASTENING
Akhundov F.A. Sarbopeeva M. Bayamirova R. Togasheva A. Zholbasarova A.
2023National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2023#2023Issue 322 - 35 pp.
The proposed article analyzes the issue related to the preparation of the wellbore for cementing the drilled interval of the well. It has been revealed that poor-quality cleaning of the well bore, including the existing cavities from drilling, brings great problems to the drilling process. For example, in conditions of insufficiently effective removal of cuttings to the surface due to the presence of a gradient layer in the flow of flushing fluid and stagnant zones in the caverns, accumulation of drill cuttings occurs. In the process of well placement, due to changing hydrodynamic conditions (pressure and flow fluctuations) when performing technological operations (flushing, development, drilling, tripping, etc.) and at certain volumes of the accumulated sludge volume in the cavity, it slips into the wellbore wells. As a result of the drilling tool sticking in many wells, sticking of the string with loss of a certain part of the wellbore takes place. The analysis carried out using buffer liquids known and widely used in the process of well fixing allowed us to reveal that these compositions, along with the fact that they have washing capacity in relation to the mudcake, must have viscoelastic properties in order to be able to clean the entire wellbore and cavities, including from the accumulated volume of particles of cuttings, and should also contribute to the removal of filter cake from the walls of the wellbore. However, the designated 3 (three) goals were not reflected in any of the works listed above. In this regard, the article presents the results on the effective cleaning of the wellbore including cavities from drilled cuttings of sludge. The influence of the compressibility of the buffer fluid on the cleaning process of the cavity from the accumulated volume of the accumulated volume of sludge particles was experimentally revealed. A new composition of a buffer fluid, characterized by high sedimentation stability and a high degree of washing capacity of the accumulated sludge particles from the cavern along the wellbore and erosion activity in relation to the mudcake, was developed.
drilling oil and gas wells , mud turbulent flow regime , preparation of the wellbore , sedimentation stability of the buffer fluid cavity , sludge particles are washed away the ability of the buffer liquid , the compressibility of the buffer liquid , the volume of accumulated sl
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Institute of Oil and Gas National, Academy of Sciences of Azerbaijan, Baku, Azerbaijan
Caspian state university of technologies and engineering named after S. Yessenov, Aktau, Kazakhstan
Institute of Oil and Gas National
Caspian state university of technologies and engineering named after S. Yessenov
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