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Electrical modelling of an electrical submersible pump system three-phase power cable used in power line communication

100%

Fonsêca D. A. M. , Salazar A. O. , Gonçalves T. R. , Villarreal E. R. L.

2019

tom R. 95, nr 10

22--26

In this paper, an analysis of electrical parameters of a 2036 m ESP three-phase power cable and round profile has been carried out. This analysis will provide subsidies to electrically model the channel through which the data will be transmitted from downhole to the surface. A printed circuit board was developed through the correct grouping of passive electronic components to represent the same impedance and phase behavior of the measured ESP power cable for a frequency range from 20 Hz to 200 kHz.

W artykule nalizowany jest system komunikacji w zanurzeniowej pompie zasilanej napieciem trójfazowy za pośrednictwem kabla. Ten sam kabel jest też wykorzystywany do przesyłania sygnałów z czujników.

Impact of the geometrical configuration of electrical submersible pump impellers on run life and sand stuffing: a case study and recommended practice

100%

Eltigani M.

Journal of Geotechnology and Energy

2024

tom Vol. 41, no. 3

5--10

The objective of this study was to identify the root cause of the premature failures of electrical submersible pumps installed in an artificially lifted brown oil field located in southeastern part of Sudan, and to mitigate the causes in order to extend the pumps run life so oil production is increased and lifting costs are reduced. One of the standard failure finding procedures, known as Dismantle, Inspection, and Failure Analysis (DIFA) was used in this study to systematically tear down and inspect the failed pumps to find out the root cause of the failures. It was found that sand accumulation (stuffing) in the radial flow impellers was the cause of premature pump failures. The study has further elaborated on the technical reasons and justification as to why radial flow impeller pumps, despite their seemingly perfect design, were unable to produce sand while the mixed flow, under designed for the same well conditions, did. This finding was then experimented on many wells and proved to be correct as demonstrated in this paper. Eventually, the result was technically proved as being attributed to the geometrical shape of the impeller flow path. The study has then correlated sand stuffing failure with the flow path geometry of the impellers and eventually projected these results to an established specific speed model (Ns) with the recommendation of adopting a pump sizing approach in mild sand-producing oil wells to cater for the geometrical flow configuration of the pump impellers.

Oilfield development and operations planning under geophysical uncertainty

67%

Redutskiy Y.

tom Vol. 9, no. 3

10--27

The oil and gas industry nowadays is challenged by dealing with nonconventional reserves and offshore environments. Decision-making associated with projects in the petroleum sector has to handle various technological issues, risks, and uncertainty. The Smart Fields approach was introduced to cope with complicated production conditions and make the production of hydrocarbons economically efficient. A significant part of this approach is proactive planning which implies taking into account the uncertainty, or lack of knowledge of the recoverable reserves, future hydrocarbon prices and various operational issues inherent in the projects. In this study, a multi-stage stochastic programming approach is employed to cover the relevant engineering issues of oilfield development and petroleum production while addressing the geophysical uncertainty related to the developed deposit. The proposed model covers such aspects as well drilling, gathering pipeline infrastructure planning, capacity selection for the infrastructure and the processing units, as well as planning the production operations with consideration of artificial lift efficiency. The model aims to optimise the entire field lifecycle, given the chosen planning criterion, that is an economic criterion of the project’s net present value. The contribution of the developed model to the area of planning in the petroleum industry is the detailed consideration of the technology: the flows and pressures in the planned infrastructure, reservoir behaviour, and the artificial lift performance. The goal of including these technological details is to apprehend the economic tradeoff between investments, operating costs and the prospective revenues, given the lack of knowledge of the geophysical properties of the developed deposit. The stochastic modelling implemented in this study is relevant to the development projects in nonconventional environments, where several deposits of various sizes are present; however, not each deposit's properties get to be studied in detail.