Auxiliary equipment for downhole fittings of injection wells and water supply lines used to improve their performance in winter

Abstract

The article deals with two methods for eliminating freezing of injection wellhead fittings. The first method involves removing injected water from the well fitting under long well operation stoppage at negative ambient temperatures. Water is removed and air is supplied through the system of valves (a spring loaded valve and a float valve). When pumping water into the injection well, the float valve closes the access to the environment, and the spring-loaded valve is open for injected water. When the injection process stops, the spring-loaded valve supplies remaining water into the well fittings and the surface part of the water supply line and closes; the float valve opens. Air into the free space of the well fittings is supplied through the float valve thereby preventing the wellhead and the surface part of the water supply line from freezing. The second method is used to prevent the mouth of the injection well from freezing. A device is installed inside the casing, which allows heat to be accumulated in summer and winter. Accumulated heat is used to heat up the mouth when the water injection process stops.

Determination of the coefficient of hydraulic friction and factors reducing the value of hydraulic resistance along the length

“…Pisarev and D.A. Volynov conducted a comparative analysis of the calculation of hydraulic resistances during laminar fluid flow in round pipes and wide channels [12]. Hydraulic losses were found taking into account the average velocity, which in the case of fluid flow in a round pipe was determined by integrating over the cross-sectional area of the pipe, due to the spatial nature of the velocity distribution in the pipe.…”

“…The result obtained by the researchers does not agree with generally accepted conclusions. Due to the lack of additional recommendations and arguments on the choice of the average speed, the researchers propose to use the average speed obtained by averaging the velocity diagram along the radius of the pipe, which ensures equality of the coefficients of hydraulic friction in the laminar regime of fluid flow in round pipes and wide channels with the same Reynolds numbers [12].…”

Modeling of the converting mechanism of rocking machines

“…Based on the already known method of designing a transforming symmetrical mechanism, we use kinematic relations and the ratio of the crank radius to the length of the rear arm of the balancer and base of the bolts as initial data [4][5][6]. When designing the asymmetrical mechanism, in addition to these parameters, the deaxial angle are used.…”

An analysis of reliability of electric submersible centrifugal pumps

“…It was assumed that the operating time before failures of the submersible parts is subject to the Weibull distribution law [6]. The values were determined from the values of b using the expression by the method of maximum probability for a repeatedly truncated sample [7] …”