1. Shell Exploration & Production
Breakout Session Low Rate Wells, Gas Wells, Unloading after Stimulation

2. Post-Stimulation Unloading and Operation
Hydraulic Fracturing
Acid treatment
Coiled Tubing / Bullhead
Concern about unloading due to unaerated liquids
Cannot do slickline work if acid in tubing
Nitrogen / Fluid
Commonly no problems unloading because of nitrogen assisting the flowback production

3. Acid – Bullhead treatment method
Common procedure
Set Plug, test tubing
If tubing test is good, pump acid job
If tubing test is bad, replace GLVs, pump acid job
If acid job does not complete, switch to flush fluid and frac way acid.

4. Acid – Bullhead treatment method
Alternative procedure
Install new valves (AFLAS packing) in all mandrels, designed to unload acid / flush fluids
No need to frac fluids if job fails
Unload / kickoff well
Run Flowing Gradient Survey
Re-design / replace valves for new conditions

5. Hydraulic Facture Treatment
Produce liquids a high rate to clear proppant from wellbore before installation of rod pump equipment
Use multi-rate design for shallow lift at high rate, but ability to lift deeper if rate is lower than desired

6. Gas Wells Wellhead Backpressure Reduction Chemical treatment Gas Lift
Wellsite compression
Chemical treatment
Foam / surfactant
Gas Lift
increase mixture vertical velocity with gas
Reduce hydraulic flow area
Velocity string, Siphon string, Diptube, Tubing extension
Can lift / produce from below perfs if desired

7. Low Liquid rate gas lift
Conventional and retrievable equipment used
May have conventional above, retrievable on bottom
Pulling units in high demand, so more retrievable equipment is being used.
Like to have lift pressure of 100 psi per 1000 ft. of lift depth
Common pressures are 750 to 850 or 1000 psi

8. Low Liquid rate gas lift
Economic issue, not a mechanical / physical limitation. How much gas are you willing to expend for the liquids produced.
Consider $60/bbl oil and $15/mcf gas
Compression costs
Wellhead compression is relatively inexpensive
$1300/month for 15 mcfd additional production
Higher compression ratio costs ~ $0.20/mcf
$2700/month for psi