Analysis of Geological Features of Oxfordian Section to Develop a Digital Model for Productive Strata

Gasumov, R.A.; Гасумов, Э.Р.; Minchenko, Yu.S.

doi:10.17353/2070-5379/41_2021

Cited by 2 publications

(1 citation statement)

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“…Analysis of field data on workover of wells of gas and gas condensate fields in Western Siberia [4,5] shows that the conventional killing fluids used (solutions of calcium chloride and sodium, hydrophobic emulsions, invert-micellar dispersions, etc.) become ineffective in the initial period of field development when reservoir pressures drop [6,7]. The high infiltration of these solutions under repression conditions contributes to the formation of a significant zone of their penetration into the formation, which sharply worsens the filtration characteristics of the formation and creates a number of intractable problems in the development of wells after workover.…”

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confidence: 99%

Development of technological solutions for reliable killing of wells by temporarily blocking a productive formation under ALRP conditions (on the example of the Cenomanian gas deposits)

Gasumov¹,

Minchenko²,

Гасумов

2022

PMI

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Modern field operation conditions are characterized by a decline in gas production due to the depletion of its reserves, a decrease in reservoir pressure, an increase in water cut, as well as due to the depreciation of the operating well stock. These problems are especially specific at the late stage of development of the Cenomanian deposits of Western Siberia fields, where the anomaly factor below 0.2 prevails, while gas-bearing formations are represented mainly by complex reservoirs with high-permeability areas. When killing such wells, the classical reduction of overbalance by reducing the density of the process fluid does not provide the necessary efficiency, which requires the search for new technical and technological solutions. In order to prevent the destruction of the reservoir and preserve its reservoir properties during repair work in wells with abnormally low reservoir pressure, AO “SevKavNIPIgaz” developed compositions of special process fluids. A quantitative description of the process of blocking the bottomhole formation zone is proposed by means of mathematical modeling of injection of a gel-forming solution into a productive horizon. The well killing technology includes three main stages of work: leveling the injectivity profile of the productive strata using three-phase foam, pumping the blocking composition and its displacement with the creation of a calculated repression. Solutions obtained on the basis of a mathematical model allow optimizing technological parameters to minimize negative consequences in the well killing process.

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confidence: 99%