Ойл Автоматика | Глубинно-насосное оборудование для добычи нефти и газа

PLUNGER UNIT WITH LINEAR MOTOR

Plunger pump with submersible linear drive for operation of low-flow well stock is the new and perspective direction in oil production.

APPLICATION AREA:
• Marginal wells 4-20 m³/day;
• Wells with depth of descent of the pump 1500-3000 m;
• Wells with complicated structure of the production casing;
• Wells of periodic Fund.

POSITIVE ASPECTS:
• The installation length is shorter by 10-20 meters compared to the IECP.

PRINCIPLE OF OPERATION:
The linear motor is an electric machine, the principle of which is based on the use of energy of a running magnetic field.
In the linear motor there are no units for converting rotational motion into translational-return. The running magnetic field induces an electromotive force that creates a pulling force, moving the motor slider and the pump plunger without the use of sucker rods.

PLUNGER UNIT WITH LINEAR MOTOR CONSISTS OF:
1. Control station of «IRZ TEK» LLC;
2. Boosting transformer (OIL-FLOODED TRANSFORMER);
3. Plunger pump;
4. Linear valve submersible electric motor with submersible telemetry unit.

In the functionality of the control station used all the developments implemented in the intelligent control stations of the sucker rod pump «IRZ TEK» LLC taking into account the specifics of the linear motor control.

FEATURES OF OIL PRODUCTION WITH THE HELP OF THE PULM TECHNOLOGY

Disadvantages of existing technologies of oil production at the marginal fund

Installation of electric centrifugal pump (ECP) in constant mode:
• Low efficiency at 30 m³/day and below
• Clogging of the working bodies, problems with cooling the motor
• Degradation of pressure-flow characteristics of ECP at high viscosity of the mixture

Installation of electric centrifugal pump (ECP) in periodic mode:
• Failure to reach production potential, problems with operating mode control
• Degradation of pressure-flow characteristics of ECP at high viscosity of the mixture

Installation of downhole sucker rod pump (IDSRP):
• Restriction on the depth of descent and curvature-failure of the production potential
• Ground metal capacity (rocking machine, pile field) and underground (pumping rods) equipment
• Increased environmental and technological risks during operation
• Reduction of overall efficiency by means of a rod column and a wedge-belt transmission

Installation of sucker rod screw pump (ISRSP) with surface drive:
• Restriction on the depth of descent and curvature-failure of the production potential
• Problems with the selection of elastomer material
• Low maintainability of the pump

Installation of electric screw pump (IESP) with submersible drive:
• Problems with the selection of elastomer material
• High value
• Low gear reliability

1 — Current lead head

2 — The slider (rotor) of the linear motor with constant magnets

3 — Linear motor

4 — Hydraulic protection of the engine starter
5 — Immersion Unit TMS

MOVE DOWN
1 — The upper valve is closed
2 — Cylinder
3 — The plunger valve is opened
4 — The plunger

MOVE UP
1 — The upper valve is opened
2 — The plunger valve is closed

THE ADVANTAGES OF THE PULM TECHNOLOGY BEFORE SRP:
• The ability to work in wells located in places with restrictions on the generated noise, or the location of ground equipment;
• Easy and quick installation compared to the non-adjustable SRP pump;
• Oil production growth to 49%;
• Work with high-viscosity fluids in comparison with SRP technologies-allows to change the speed of the plunger and the engine heats the fluid coming to the pump reception;
• The pump has gravity separator-increase the allowable threshold of free gas for 10-15%;
• The ability to select the mode of operation of the pump under the changing inflow in the well to improve production efficiency;
• The presence of the telemetry system in the wellbore.

THE ADVANTAGES OF THE PULM TECHNOLOGY BEFORE ECP:
• Increase in oil production rate from 18% to 130%;
• The continuous operation in wells where the ESP installation transferred into intermittent mode. Ability to control the supply from zero to the maximum flow rate of the installation; installation adapts to changing conditions in the well;
• Working with higher viscosity fluids compared to ECP — allows to change the speed of the plunger and the engine heats the fluid coming to the pump reception;
• Reduction of specific energy consumption for production of 1 m3 of liquid from 4% to 36%;
• Makes commissioning of a conserved and inactive Fund of marginal wells economically viable.

ADVANTAGES OF TECHNOLOGY

	SRP	ECP	PULM
Productivity (m3/day)	<30	>15	<30
Descent depth (m)	<2000	<3000	<3000
Operational mode	constant	intermittent	constant
Specific energy consumption (kW/t)	20	10	8
The arrangement of the wellhead	demand	nonexistent	nonexistent
Substitutability	yes	nonexistent	yes

Conclusion: at depths of more than 2000 m, with a flow rate of up to 30 m³/day, the technology of PULM is the best in terms of the set of technical and economic indicators, and in some cases, no alternative.

INSTALLATION STRUCTURE

1 — Control station

2 — Plunger pump
3 — Linear motor

4 — Stator
5 — Slider

PULM (117mm)	20, 35, 50 kW/t
Pump (plunger diameter)	32, 38, 44, 57 mm
CS	380V, 660V, 990V
TMS	Universal Digital TMS

The combination of PULM, pump and CS is selected on the basis of the depth of descent, performance, viscosity.
It is possible to select pumps of special design for difficult operating conditions.