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