2EVN 5-50-1200 - Pumps submersible twin screw EVN5

EVN5 Submersible screw twin pumps and field units on their base are designed to pump stratal liquid of higher viscosity out of the oil wells having a nominal diameter of casing string of 146 mm as per GOST 632-80. Minimum internal diameter – 121,7 mm.

The content of mechanical admixtures in the liquid being pumped out – is not to exceed 0,8 gr/l, the content of free gas at pump intake by volume – not more than 50%, water content – not more than 99%.

Maximum temperature of liquid under formation conditions – 343 К (70°С) for the pumps furnished with shells made of rubber 2D-405.Maximum viscosity of liquid under formation conditions - 1*10-3 m²/s.

The field unit consists of pump , electric motor completed with hydroprotection , lines of the current lead with a cable joint box , control station , and transformer.

The pump comprises: two pairs of working members (shell with screws) with the right and left-handed direction of the spiral, two eccentric clutches, the base with foots (pivots) made of siliconized graphite, overrunning clutch, safety valve and stationary base members.

In the top portion of the pump there is a safety valve. Provision is made in pumps of modification K for the special attachment which is installed between the protector and the electric motor. The said attachment eliminates any ingress of clay mortar into the zone of master clutch.

The submersible pump unit is lowered into a well by way of the oil well tubing. Furthermore, the cable is fastened to the said tubing by special belts. The startup of the electric motor is carried out through the complex device. In unit operation, the torque through a shaft of the protector, then, master clutch, power shaft and eccentric clutches of the pump is transmitted to the working screws.

The liquid via the filters is sucked in simultaneously by upper and lower screw pairs.

Two pairs of working members (shell-screw) are working in parallel and are creating a pressure which is required to lift the liquid to the surface.

The flow from a pump is equal to the sum of feedings of two working pairs, and the head of the pump is equal to the head of each working pair.

• are applied by the oil and gas extracting companies for extraction of heavy high-viscosity oil with the big content of mechanical impurity from wells of small and average flow rate and high-watered wells thus pumps operates at the lowered rotating speed (100-500 rpm), that can increase their guaranteed resource of an operating time up to 700-800 days
• are applied by the oil and gas extracting companies as more effective and cheap method of the mechanized oil extraction based on small power and metal consumption, replacing a traditional way of oil lifting by centrifugal and sucker-rod pumps

• safety coupling to stop rotation in the wrong direction
• extensive application by capacity
• capacity is directly proportional to rotation speed
• operation with produced water with a high gas ratio
• gas separators are not required
• handling liquids with big viscosity

Example 2 EVN 5 12 1000 V5 TU 3665-024-05747979-99, where :

• 2 - Pump is completed with six-pole electric motor with rotating frequency 1000 rpm or geared attachment (without number 2 pump is completed four-pole electric motor with rotating frequency 1500 rpm)
• EVN5 - designation of the pump:E - drive from submersible pump, V - screw, N - pump, 5 - group of pumps for casing pipes O146 minimum internal diameter O121,7 mm
• 12 - capacity, m3/day
• 1000 - head, m
• V5 - climatic version and location category as per GOST 15150-69