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  • Schematic diagram of the hydraulic drive Geron +
Schematic diagram of the hydraulic drive Geron +

C — hydraulic cylinder;
RSSRP — rod string
with sucker rod pump;
M — reversible electric motor;
P — hydraulic motor pump
reversible;
T — a hydraulic tank;
F — drain filter;
M200 — active lightning protector;
IECS — intelligent electronic
control system with frequency
converter (FC);
HE — heat exchanger;
HS — hydraulic system;
LS — linear system for reverse
connection piston position with
hydraulic cylinder.


Operating principle
A polished rod at the wellhead is connected to the hydraulic cylinder rod through the wellhead suspension.

The hydraulic drive is operated by means of a pumping station installed in a block-box or a platform and is controlled by an intelligent electronic control system. While lifting the rods with fluid, the first section of the hydraulic pump motor pumps the hydraulic oil into the rod cavity of the hydraulic cylinder. As a result, the polished rod rises. At this time, the second section of the pump motor supplies the hydraulic oil through a drain filter and a heat exchanger.

When lowering, the flow of hydraulic oil from the rod cavity of the hydraulic cylinder is displaced by the weight of the pump and rods and charges the pneumatic accumulators with nitrogen through the multiplier or is poured into the tank through the first section of the reversing pump motor, while the electric motor controls the braking of the electric motor via a frequency converter (with recuperation option), electricity is generated.


RETURNED ENERGY IS USED AT THE NEXT STROKE, WHICH PROVIDES ENERGY SAVING EFFECT (up to 30%)
Intelligent Electronic Control System (IECS)

The use of an intelligent electronic control system (IECS) based on a programmable logic controller and a frequency converter with a built-in recovery function allows one to:

· evaluate the flow rate of a gas-liquid fluid of a well by taking dynamograms in real time;
· save up to 30% of energy consumption when controlling an asynchronous drive motor (due to the use of a frequency converter, with built-in recovery function);
· minimize operator intervention in IECU;
ensure uninterrupted operation in conditions of unstable supply voltage;
· reduce total maintenance costs,
· reduce equipment downtime due to the remote monitoring and control system based on the WEB interface;
· A log file registers all types of failures.

The structure and characteristics of IECS
IECS main screen
Dynamic Level Control Screen
Making a dynamogram
RPM VV / VN — reflects engine revolutions per minute when the actuator rod moves up and down, the value is automatically selected in accordance with the settings and provides an increase in the efficiency of the submersible pump
Daily performance — general, m3 - reflects the estimated volume of produced fluid per day and from the beginning of the drive's operation, due to the correct selection of the pump coefficient of the sucker rod pump, it is possible to display values close to the actual volume of produced fluid
Status — reflects the current status of the Drive, information is necessary for timely decision-making on managing the operation of the Drive
The number of moves real -set — reflects a change in the actual number of double strokes of the hydraulic cylinder rod relative to a given value, is automatically selected and maintained depending on changing external conditions (load change)
Load — the indicator is used to assess the dynamics of changes in the load on the hydraulic cylinder rod during operation of the "GERON +" hydraulic drive
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Calculation of the pump filling coefficient — manually set interval when the filling ratio will be evaluated.
Echosounder is a device for measuring the dynamic level in a well by measuring the speed of acoustic waves in a gaseous medium.
Level measurement frequency — the time interval at which the dynamic level is estimated.
Minimum filling coefficient — minimum filling factor of the pump
Load rate — an indicator of the magnitude of the load during the upstroke and during the downstroke, above which the equipment will stop working.
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Анализ изменения средней нагрузки на шток гидроцилиндра при построении динамограммы позволяет оценить тенденцию изменения динамического уровня в скважине. По оценке увеличения/уменьшения средней нагрузки на шток гидроцилиндра система управления ПШСНГ может управлять соответ-ствующим изменением количества двойных ходов штока и изменением длины хода штока.