SU661144A1 - Hydraulic drive of deep-well rod pump installation - Google Patents

Description

one

The invention relates to equipment for the oil industry, in particular to hydraulically driven sucker rod pumping units, and can be used to lift the formation fluid to the surface.

The hydraulic actuator of the deep-well pumping installation is known, which comprises a hydraulic cylinder, a power pump with an engine on the drive shaft and an output highway connected through a spool valve to the cavity of the cylinder, energy accumulator 1

A disadvantage of the known design of the hydraulic drive is its low reliability, due to the presence of the storage device and the additional pneumatic-hydraulic devices that ensure its normal operation, as well as the high intensity of the structure itself.

The aim of the invention is to increase the reliability and reduce the metal consumption of the installation.

This goal is achieved by the fact that the discharge valve is installed on the output line of the pump (1); 1N. and the energy accumulator is made in the form of a flywheel mounted on the drive shaft of the drain pump.

The drawing shows what is the shtangovoy deep well pump installation.

The installation consists of a hydraulic cylinder 1, a piston 2, which is connected to the plunger of a submersible pump 3 suspended on a column of pump-compressor pipes 4.

Claims (1)

A power pump 5, the shaft of which is supplied with an energy accumulator, made in the form of a flywheel 6, is driven by the engine 7. A discharge valve 8 and a safety valve 9 are installed at the outlet of the power pump. The oil flows are switched by means of the power slide 10. The power slide is controlled Pilot spool 11 driven by a cam. set: 1ennyU1 to k; 1anke 12 reverse, moved up and down by stop 13. The upper cavity of the cylinder through a safety valve 14 is connected to the tank 15. All nodes ycraJiOBKH are mounted on the frame (not shown in the drawing). The powering of the hydrofusing motor is carried out through a current relay 16 controlling the winding of the relief valve 8. The installation operates as follows. When the boom moves upwards, the power pump 5, driven by the energy of the engine 7 and the flywheel 6, supplies oil from the tank 15 to the lower cavity of cylinder 1. At the same time, the piston 2 together with the rod string moves upwards and the oil from the upper cavity is forced out into the tank 15 The plunger of the submersible pump 3 does not stay up and the suction stroke occurs. When reaching the topmost position, the stop will move the bar 12 upwards, the cam switches the spool 11, which gives the command of the force spool. After switching the power spool 10, the upper and lower cavities of the cylinder are connected to the pump 5. The cylinder thus functions as a differential valve and its rod under the action of the pressure of the power pump, which is determined during the downward stroke by setting the pre. guard, dapana 14, as well as under the pressure of gravity of the rod string is mixed down. The pump pressure at the boom stroke is selected based on the absence of buckling of the top part of the drill string n 8-K) times less than when the boom moves up and the power is increased to increase the kinetic -) flywheel 6. In this case, the plunger of the depths of the south pump moves downwards and a pumping stroke occurs. When the hydraulic drive of the shta-shaft submersible pump is started up, i.e., as the engine speed increases from zero to nominal, the magnitude of the current consumed by the motor exceeds the mean value by more than 10-15 times. At this time, the current relay energizes the winding of the discharge valve 8, it opens and the entire flow of the working fluid is directed to the tank 15. At the same time, the pressure drop across the pump 5 is small (determined by the value of the hydraulic resistance of the valve .8 and pipelines) and engine energy is expended to increase the potential energy of the flywheel, i.e., to increase the number of revolutions. When the motor reaches its rated speed, the current decreases, the current relay shuts off the unloading valve and the flow of working fluid is directed through the power spool 10 to the hydraulic cylinder 1. Thus, the presence of a flywheel 6 storing the kinetic energy of the engine during the boom down stroke and the unloading valve 8 operating when commissioning of the installation allows to increase the reliability and reduce the metal consumption of the installation. Claims of the invention A hydraulic drive for a sucker-rod pumping unit comprising a hydraulic cylinder, a power pump with an engine on the drive shaft and an output line connected through a spool valve to the cylinder cavity, an energy accumulator, characterized in that in order to increase reliability and reduce the metal intensity of the installation, The output line of the power pump is equipped with a discharge valve, and the energy accumulator is designed as a flywheel mounted on the drive shaft of the power pump. Sources of information taken into account during the examination 1. Molchanov A. G., Chicherov L. G. Oilfield equipment and mechanisms, M., “Pedra, 1976, p. 74, fig. 1-38, 39. i: ib 15