About theory of stability of operation mode of steam-water well in exploitation of geothermal power plants

It is shown that the Entov-Droznin theory, which describes the stability of the operating mode of the steam-water well, does not contain a convincing description of the mechanism of occurrence and development of the instability, and does not explain a number of practically observed phenomena, such as: stabilization of the operating regime with increasing wellhead pressure; the absence of instability near the inversion point of the productivity curve; instability at low flow rates, which fall under the stability condition. A mechanism of beginnings and development of instability is considered in the paper. The mechanism is expressed as reaction on fluctuations in the flow parameters in the form of an increase (or decrease) in the force causing an increase (or decrease) in the pulse as a result of an increase (or decrease) in the pulse itself. It was noted that the development of instability in the steam-water well is due to the decrease in the gravitational component of the pressure drop with increasing flow and is carried from the wellhead to the bottomhole. This mechanism is consistent with a set of known phenomena used to justify the Entov-Droznin theory and those that contradict it. Theoretically, the dependence of the well test results on flow conditions downstream from the wellhead and the possibility of metastable flow is predicted, when the condition of stability for the well is not generally satisfied, but there are no conditions for the development of instability at the wellhead. Data are presented that indicate the practical existence of the predicted phenomena.

Keywords

steam-hydrothermal field, production well, steam-water flow, stability, productivity curve

Acknowledgment

The study was carried out with the financial support of the Russian Foundation for Basic Research in the framework of research project No. 16-05-00398 a.

Received

16.01.2019

Publication date

16.01.2019

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GOST	Shulyupin A. About theory of stability of operation mode of steam-water well in exploitation of geothermal power plants // Izvestiia Rossiiskoi akademii nauk. Energetika – 2018. – Issue 6 C. 103-117 [Electronic resource]. URL: http://ras.jes.su/energetika/s000233100003523-9-1-en (circulation date: 29.04.2024). DOI: 10.31857/S000233100003523-9
MLA	Shulyupin, A. "About theory of stability of operation mode of steam-water well in exploitation of geothermal power plants." Izvestiia Rossiiskoi akademii nauk. Energetika 6 (2018):103-117. DOI: 10.31857/S000233100003523-9
APA	Shulyupin A. (2018). About theory of stability of operation mode of steam-water well in exploitation of geothermal power plants. Izvestiia Rossiiskoi akademii nauk. Energetika (6), pp.103-117 DOI: 10.31857/S000233100003523-9

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