Artificial lifting Equipment

“Artificial lifting Equipment” for Horizontal Wells (including ESP Pump for horizontal wells)

A. Artificial Lift system for Horizontal oil wells

The prevalent artificial lift modes in ONGC are Gas Lift, SRP, and ESP & PCP. Jet pumps were also tried, but have not been used extensively.

i) The challenges include
a) Mechanical failures of lift equipment due higher deviation resulting in higher stresses.
b) Operational inefficiencies resulting due to higher propensity of phase segregation in horizontal well bores.
c) Non-availability of indigenous lift equipment of requisite quality catering to rigorous functional requirements.

ii) Boundary conditions for arriving at innovative solutions for artificial lift equipment for horizontal wells.

S. No. Parameter Value
1 Fluids

a)      Flow rates

b)      Water cut

c)       GVF

d)      API gravity

e)      Viscosity

f)       Wax / Asphaltene

g)      Sand

 

10 – 5000 blpd

0 – 95 %

Upto 0.90

10 – 45 deg

Up to 3000 Cp

Up to 25% by wt

Up to 10% vol ( with sand control measures ), up to 20% ( without sand control measures )

2 Well Completion

a)      Depth

b)      Deviation

c)       Dog leg severity

d)      Casing

e)      Tubing

 

Up to 3000 m

0 – 90 Deg

0 – 10

5 ½” / 7” / 9 5/8”

2 7/8” / 3 ½”

3 Pump Intake conditions

a)      Pressure

b)      Temperature

 

10 bar

175 Deg C

4 Automation

a)      Down hole / surface sensors

b)      Remote data acquisition system

5 Power Supply

a)      Conventional / alternate energy ( solar etc )

B. Artificial Lift system for horizontal gas wells

i) Challenges include decline in vertical lift performance because of fall in reservoir pressure. Innovation challenge is to boost the fluid (gas + water + condensate) pressure at down hole to be able to reach surface at desired pressure.

ii) Boundary conditions

S. No. Parameter Value
1 Pressure Boosting requirement 10 – 120 bar & 5 – 40 bar
2 Flow rates

a)      Gas

b)      Water

c)       Condensate

 

up to 0.6 MMSCMD

up to 200 m3/day

up to 100 m3/day

3 Temperature 120 Deg C
4 Gas quality H2S – up to 200 ppm, Co2 5 – 6 %