workover presentation (1)

short information about workover process designed for educational purposes

1. Completions / Workovers

2. Completions / Workovers
•Production Improvement
1.Improvement in ESP run life
•Operational needs
–Operational process
•Detailed Procedures
•Best Practices – Shared by bu’s and contractors
•Lessons Learned - Shared by bu’s and contractors
•Contractors become more proactive – fill in the gap ( but
they have to be experienced and qualified to do it while
we train.
.

3. –Team Development
•Contractors
•Field shop – job preparation
•Redress facilities
•TNK-bp engineering staff
•TNK-bp operations team and support
–People
•Sufficient number and Competent Supervisors
•Well defined roles and responsibilities
•What if we can’t get enough competent Supervisors?
Use experienced contractors – they have to
proactive.
Completions / Workovers

4. Completions & Workovers
–Job Planning
–????
–Logistics
•Right Vehicle for the job
•Proper transport container for the part
•Vehicle Preparedness
–Quality Assurance and Quality Control
•Equipment re-build or re-dress as per manufacture guidelines
•Manufacturing quality paln
•Field shop / redress center Quality Plans
•Rig site quality Plan
•Detailed Job procedures

5. Completions / Workovers
•Mechanical needs for Improvement in ESP run
life
–Cable Clamps
–Proper rated cables and equipment in the well
–Wellbore clean out after Frac
»Viscous pills to kill formations and control losses
»W/O rig w/ work string – high rates / reverse
circulation to wash sand out
»Washdown screens

6. –Fluid Loss during ESP change outs
»Viscous pills to control losses
»Filtration of completion fluids
»Mechanical barriers – downhole shutoff
–Solids or fines control
»Screen below packer
»Different types of screen
»Low cost sand control
–Dual ESP’s or ESP and Jet Pump combination

7. Water Control

8. Water Control
Problem: Water Coning
Possible Solution: Cement Off Lower Perfs

9. Water Control
Problem: High Perm Streaks
Possible Solution: 1)Treat with Perm Modifier Chemical,
2) Manage water
injection

10. Completions / Workovers
2. Water Control
•????Squeeze off formations
•Chemical to change the reservoir permibility
–Bright Water – bp Technology
–?? Halliburton and Schlumberger and others
•Downhole sink completion method - (this method produces the
water from below the WOC to reduce the coning effect near the
wellbore, allowing for great effects from the waterflood).
•Service company – chemical treatments
•Easywell constrictors
•Logging and traciers to see where the water is coming from
•Balancing water injection

11. 3. Scale and Corrosion
•Continuous Chemical injection
–Down annulus
–Down tubing
•Batch inhibitor treatment - Pump a large volume of inhibitor
into the annulus perodically
•QA/QC
–Inhibitor testing on oil & water for emulsions
–Inhibitor testing on the pump and cable elastomers