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D. V. Mardashov
D. V. Mardashov
Saint Petersburg State Mining Institute (Technical University)
Saint Petersburg State Mining Institute (Technical University)

Articles

Modern Trends in Hydrocarbon Resources Development
  • Date submitted
    2021-09-17
  • Date accepted
    2022-04-07
  • Date published
    2022-12-29

Technique for calculating technological parameters of non-Newtonian liquids injection into oil well during workover

Article preview

Technique for automated calculation of technological parameters for non-Newtonian liquids injection into a well during workover is presented. At the first stage the algorithm processes initial flow or viscosity curve in order to determine rheological parameters and coefficients included in equations of rheological models of non-Newtonian fluids. At the second stage, based on data from the previous stage, the program calculates well design and pump operation modes, permissible values of liquid flow rate and viscosity, to prevent possible hydraulic fracturing. Based on the results of calculations and dependencies, a decision is made on the necessity of changing the technological parameters of non-Newtonian liquid injection and/or its composition (components content, chemical base) in order to prevent the violation of the technological operation, such as unintentional formation of fractures due to hydraulic fracturing. Fracturing can lead to catastrophic absorptions and, consequently, to increased consumption of technological liquids pumped into the well during workover. Furthermore, there is an increased risk of uncontrolled gas breakthrough through highly conductive channels.

How to cite: Mardashov D.V., Bondarenko А.V., Raupov I.R. Technique for calculating technological parameters of non-Newtonian liquids injection into oil well during workover // Journal of Mining Institute. 2022. Vol. 258. p. 881-894. DOI: 10.31897/PMI.2022.16
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2021-03-18
  • Date accepted
    2021-09-10
  • Date published
    2021-10-29

Development of blocking compositions with a bridging agent for oil well killing in conditions of abnormally low formation pressure and carbonate reservoir rocks

Article preview

Production well killing before workover operations in late-stage oil and gas-condensate fields can be complicated by abnormally low formation pressure, carbonate type of reservoir rocks, and high gas-oil ratio. These complications lead to the intensive absorption of technological fluids by the formation and gas ingresses, which, in its turn, increases the time of killing wells and putting them on production, reduction of productivity, and additional costs. Therefore, it is crucial to develop a high-performance well-killing composition that would allow improving the efficiency of killing wells in complicated geological, physical, and technological conditions at the expense of reliable overlapping of the perforation interval (or open wellbore) to prevent gas intakes and gas outflow from the formation. To develop blocking compounds, a set of laboratory tests has been carried out, including physical and chemical (determination of density, viscosity, thermal stability, sedimentation stability, etc.) and research of blocking and filtration properties of compositions during simulation of a fractured reservoir. In the course of laboratory tests, the choice of fractional composition and polymer filler concentration was substantiated in the blocking emulsion and polymer compositions to increase the efficiency of their application under the complicated conditions of killing oil wells. As a result of laboratory research and field tests, the emulsion and polymer blocking compositions containing bridging agent (microcalcite) were developed, which increase the oil well killing efficiency by preventing the absorption of technological fluids in the formations and, as a result, preserving its productivity.

How to cite: Mardashov D.V. Development of blocking compositions with a bridging agent for oil well killing in conditions of abnormally low formation pressure and carbonate reservoir rocks // Journal of Mining Institute. 2021. Vol. 251. p. 617-626. DOI: 10.31897/PMI.2021.5.6
Topical issues in prospecting and development of oil and gas deposits
  • Date submitted
    2011-07-15
  • Date accepted
    2011-09-23
  • Date published
    2012-01-01

The development of the hydrophobic emulsion composition for oil well remedial work

Article preview

The investigations of thermostability and rheological properties of the hydrophobic emulsion compositions; modeling the process of filtration in  interstratificated and heterogenetic layers, and filtration in conditions maximally approximated to formation conditions were provided. The optimal composition of process liquids which is able to regulate filtration properties of reservoir-formation of the bottom hole formation zone is developed.

How to cite: Mavliev A.R., Rogachev M.K., Mardashov D.V., Naugolnov M.V. The development of the hydrophobic emulsion composition for oil well remedial work // Journal of Mining Institute. 2012. Vol. 195. p. 57.
Topical issues in prospecting and development of oil and gas deposits
  • Date submitted
    2011-07-02
  • Date accepted
    2011-09-20
  • Date published
    2012-01-01

Rheological and penetration tests of emulsion compositions for the flow-control technologies

Article preview

Based on the investigations of stability and rheological properties of the hydrophobic emulsion compositions, and on modeling the process of filtration in conditions maximally approximated to formation conditions, the optimal composition of process liquids which is able to regulate filtration properties of reservoir-formation of the bottom hole formation zone was developed.

How to cite: Naugolnov M.V., Rogachev M.K., Mavliev A.R., Mardashov D.V. Rheological and penetration tests of emulsion compositions for the flow-control technologies // Journal of Mining Institute. 2012. Vol. 195. p. 69.
Development of oil and gas deposits
  • Date submitted
    2010-07-14
  • Date accepted
    2010-09-07
  • Date published
    2011-01-01

Substantiation of pumped volumes of flow angularity compositions in injection wells

Article preview

The method of calculation pumped volumes of flow angularity compositions in injection wells, which based on combination of the seepage theory, laboratory investigation and field experience is developed.

How to cite: Mavliev A.R., Rogachev M.K., Mardashov D.V. Substantiation of pumped volumes of flow angularity compositions in injection wells // Journal of Mining Institute. 2011. Vol. 189. p. 182.
Geology
  • Date submitted
    2006-11-11
  • Date accepted
    2007-01-23
  • Date published
    2007-05-01

Development of technologies for killing and stimulation of oil wells during underground workover

Article preview

The experience of oil field development shows that filtration parameters of bottomhole formation zone are gradually decreasing as a result of killing and operation of wells. The main reason for this is the use of water-based process fluids, which are now widely used in the oil industry. Currently, considerable attention is being paid to increasing reservoir penetration area by using active acids to stimulate oil and gas wells. Hydrocarbon-based compositions, in particular invert emulsions, are alternative systems for solving these problems.

How to cite: Rogachev M.K., Mardashov D.V., Strizhnev K.V. Development of technologies for killing and stimulation of oil wells during underground workover // Journal of Mining Institute. 2007. Vol. 173. p. 20-22.
Geology
  • Date submitted
    2005-07-23
  • Date accepted
    2005-08-13
  • Date published
    2006-02-01

Improvement of technology of fastening of near-well zone with the purpose of liquidation of overflows in gas-condensate wells

Article preview

The problem of maintaining tightness of tubing annulus in gas and gas condensate reservoirs is especially urgent. Leakiness is caused by the fact that formation fluid in such reservoirs often contains aggressive components - hydrogen sulfide, carbon dioxide, as well as poor insulation of formations containing these agents. This leads to various complications during well operation.

How to cite: Mardashov D.V. Improvement of technology of fastening of near-well zone with the purpose of liquidation of overflows in gas-condensate wells // Journal of Mining Institute. 2006. Vol. № 2 167. p. 35-37.