Special pumps for corrosive oil wells

we adopt conventional sucker rod pumps for oil recovery, normally we will get a very low pump efficiency. Meanwhile, gas locking may happen frequently, which will bring a lot of trouble to oil recovery and make us lose countless time and money for repairing the pumps.

What influence will gas bring on sucker rod pump?

In oil wells with high gas cut, the oil liquid has poor fullness. So if we adopt conventional sucker rod pumps for oil recovery, normally we will get a very low pump efficiency. Meanwhile, gas locking may happen frequently, which will bring a lot of trouble to oil recovery and make us lose countless time and money for repairing the pumps.

What is more serious? Operation with conventional pumps in high gas cut wells will result in “liquid impact”, which would accelerate the damage of tubing, sucker rod strings, pump valves, valve cages, and other downhole equipment.

Gas locking: After frequent compression and expansion of the gas in sucker rod pump, the suction valve often cannot be opened normally, So that the crude oil cannot be pumped out. This phenomenon is called “gas locking”.

Liquid impact: During the upstroke, if the pump is not completely filled with well liquid, a low-pressure air cap will be formed on the top of the pump chamber between the floating valve cage and the fixed valve cage. During the subsequent downstroke, the gloating valve cage will keep closed until being hit by the well liquid surface. This phenomenon is called “liquid impact” and it will cause severe impact load on the entire artificial lifting system.。

We, Shengji Group, has special designed sucker rod pumps for high gas cut wells to avoid these problems: Gas locking prevention pump, long plunger anti-gas & anti-sand pump, forcing valve open type pump, double-plunger valve type pump, etc.

Forced opening valve type insert pump Features

1)The traveling valve is a spherical valve for forced opening and closing which can not only open and close in time, but also have a long service life.

2)The plunger can rotate freely to prevent sand stuck and partial wear. It  improves the service life.

Application

The pump is suitable for heavy oil wells with high gas content.

TypeSizeParameters
Basic Dia., in
(mm)
Plunger Length,ft
(mm)
Barrel Length,ft
(mm)
Tubing SizeRod SizePump Constant
Forced opening valve type pump25-1751.75(44.45)Standard Lengths are: 2ft (0.61m) to 24ft(7.32m) in 1ft(0.306m) increments.Standard Lengths are: 4ft (1.219m) t034ft(10.363m) in 1ft(0.305m)2 7/8 NU/EU3/4in2.235
25-2252.25(57.15)2 7/8 NU/EU3/4in3.694
30-2752.75(69.85)3 1/2 NU/EU7/8in5.518
TypeSizeParameters
Basic Dia., in
(mm)
Plunger Length,ft
(mm)
Barrel Length,ft
(mm)
Tubing SizeRod SizePump Constant
Long plunger anti-gas lock and anti-sand pump25-1501.5(38.1)Standard Lengths are: 2ft (0.61m) to 24ft(7.32m) in 1ft(0.306m) increments.Standard Lengths are: 4ft (1.219m) t034ft(10.363m) in 1ft(0.305m)2 7/8 NU/EU3/4in1.642
25-1751.75(44.45)2 7/8 NU/EU3/4in2.235
30-2252.25(57.15)3 1/2 NU/EU3/4in3.694

Characteristic

With anti-gas device, the pressure requirement of opening floating valve is reduced to 1/3~1/4 of original requirement,having improved the force condition of the floating valve. So the gas locking problem can be prevented.

Application

Light oil well with high gas cut.

TypeSizeParameters
Basic Dia., in
(mm)
Plunger Length,ft
(mm)
Barrel Length,ft
(mm)
Tubing SizeRod SizePump Constant
Gas locking prevetion pump25-1501.5(38.1)Standard Lengths are: 2ft (0.61m) to 24ft(7.32m) in 1ft(0.306m) increments.Standard Lengths are: 4ft (1.219m) t034ft(10.363m) in 1ft(0.305m)2 7/8 NU/EU3/4in1.642
25-1751.75(44.45)2 7/8 NU/EU3/4in2.235
30-2252.25(57.15)3 1/2 NU/EU3/4in3.694

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