Advanced Well Control

Two innovative technologies - seawater injection and polymer plugs with potential to • Reduce probability of an uncontrolled release • Reduce impact of an uncontrolled release relative to

the well capping or relief wells

Objective /Prize

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Well Control Incident

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Prevention Mitigation

Polymer Plugs & Seawater Injection potentially on both sides of bow tie

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Well-Control Bow Tie

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Secondary Packoff Concept (SPC)

Technology Highlights

• Surface or Subsea mounted finite volume fast set resin/catalyst injection (customized to secs)

• Activated with or without riser attached

• Kill well by injecting mud below plug

• Applicable for prevention and mitigation

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Polymer Plug

Shear ramactivated but leaking

ResinCatalyst

Kick detected

Polymer PlugResin/catalyst activated

ResinCatalyst

Polymer PlugFlow stopped and kill weight mud pushed to kill well.

Kill weight drilling fluid

ResinCatalyst

Secondary Packoff Concept (SPC)

• Current Status: • Demonstrated mechanical integrity for up to 20% mud contamination and

piston loads of 15,000psi• Completed tests in a simulated BOP

EXP-1778 tested specimen EXP-1778

untested specimen

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Secondary Packoff Concept (SPC)Dynamic testing at Southwest Research Institute tested development of a plug in a simulated BOP

• Kerosene used as surrogate for drilling mud / reservoir liquids• Scaled flow rates matched residence time of fluids in a BOP with a failed blind shear ram

• 100 second matches a 10 k bbl/day release• 20 seconds matches a 50 k bbl/day release

• Mud temps were 50°C / resin & catalyst at 4°C

Polymer plug formed within the BOP and stopped the flow of drilling mud into Hopper 2

Pilot System

Kerosene

Simulated BOP flowing kerosene

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Seawater Injection concept

Technology Highlights

• Injection of high rate seawater to create sufficient backpressure to allow bullheading of KWM

• Possible use of cement/mud pumps if employed early

• Possible use of surface equipment (e.g Rotating Gas Handler (RGH) to add backpressure (~400psi)

• Dynamic balance of seawater and mud injection during final kill operation

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Seawater Injection

Shear ramactivated but leaking

Kick detected

Seawater InjectionSeawater injection started.

Seawater InjectionKill weight mud displaces seawater to kill well.

SWI: Initial Results• Current Status: Steady state and transient analysis suggest that rig equipment likely

sufficient to handle leak if caught early. Frac pumps available for larger leaks.

• Next phase: Model dynamics of well kill operation, Erosion of blind shear ram (BSR), early kick detection measurement technologies

Transient Analysis (Add Energy)

Steady State Analysis (URC)

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Forward Plans• Complete feasibility studies

• Polymer plug formation under dynamic conditions and high pressure

• Promote Industry Interest• SPE ATCE 2017 paper describing polymer plugs (Paper 187318)• Submit peer-reviewed publications

• Second phase feasibility of polymers plugs• Dynamic modeling of seawater injection

• Establish Industry Participation• Form JIP to fund and mature concept

• OOC agreed to promote and administer• Interest from Chevron, BP, HWCG, DOE, BSEE

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JIP Funded Research PlanPhased approachPhase 3 ($2M/year for 2 years; 8 partners; $250K/year)• Evaluate erosion potential• Evaluate operational challenges• Develop detailed designs• Define modifications to well-control protocols• Conduct scaled dynamic testing at pressure / temperature

Phase 4 ($5-$10M) – if needed• Conduct field testing at full scale using an oil surrogate

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Questions?

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