«Geology, geophysics and development of oil and gas fields»

Plugging solution with controlled physical and mechanical properties for fastening low-consolidated formations

UDC: 622.245.422
DOI: 10.33285/2413-5011-2023-9(381)-62-67

Authors:

¹ Azerbaijan State Oil and Industry University, Baku, Azerbaijan
² State Oil Company of the Republic of Azerbaijan (Socar), Baku, Azerbaijan

Keywords: sand, wellbore zone, cement slurry, expanding additive, dynamic load, deformation, compression, bending, permeability, acid, plasticizer

Annotation:

When developing oil and gas fields composed of unstable reservoirs, various complications arise that worsen the technical and economic indicators of oil and gas production. Low consolidation leads to intensive sand production, to limit which requires fixing the bottomhole zone and limiting the inflow of formation waters, which activate the destruction of rocks in the near wellbore space. The removal of sand from the well with the produced product complicates the operation of pumping equipment, which leads to an increase in the cost of the produced fluid and an increase in the frequency of repairs in the future. In this situation the use of lightweight cement slurries is required. The practice of fixing the bottomhole zone shows that the cement barrier, which creates an obstacle to the flow of sand from the formation into the well, is the weakest link and can easily be destroyed under the influence of various loads. To the greatest extent, the violation of integrity is observed in the process of dynamic loads. The most significant dynamic loads leading to the destruction of the cement barrier in the near wellbore zone are loads during cumulative perforation, hydraulic fracturing (HF), pressure testing of casing strings, etc. To solve this problem, various plasticizing additives are used.

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