Ph.D. Theses

Methodological basic of decision making on control of highly viscous oil extraction process

Kirdoda Igor Ivanovich

2525.01 - Development and exploitation of oil and gas fields

Hard-to-recover hydrocarbons with a high content of heavy and viscous oils are a promising source of significant production growth in the coming years, exceeding conventional reserves of light and low-viscosity oil.

The aim of this work is improving the efficiency of well operation in the rough conditions due to the maximum reservoir energy usage under heavy oil recovery and development of optimal operational parameters of well pumping.

Researches spent shows the ability of the temporal approach on the diagnostic data evaluation taking into account current oil withdrawal and designation of optimal regime of well operation. On the basis of the deviance of the main technological indicators a technique to detect deviations in operation of producing wells and dynamic characteristics of the system “reservoir – well – deep-well pump” have been developed.

A methodology enabling to take into account the influence of the “skin factor” and limit shear stresses during the flow of high-viscosity oil in the bottom hole formation zone on the static fluid level in the well was developed. The dimensionless parameters obtained on the basis of field research is directly proportional to the actual pressure losses taking into account the reservoir properties and fluid characteristics. Indirect methods of dynamic analysis of field data using elements of fractal theory, mathematical statistics and entropy analysis, which allows to implement a reliable assessment of the status of the field development have been developed.

Technology for impulse pressure impact on the reservoir and methods of the dynamometer cards analysis providing increasing wells productivity with simultaneous increasing of operating time of pump equipment were developed.