Simulation While Drilling and Relief Well Injection Spool

Recent advancement in well-control technology improves safety and allows cost savings for well designs

1

Doing More for Less – What can we cut?

The cost of a blowout is difficult to measure

Total cost to BP for Macondo is in the range of $70 billion*

During normal operations, drilling wells is the

largest expense to an operator

Rig rates

Number of casing

Technology to reduce a casing string

$2 mill per normal well

$50 mill per Big Bore well

+$300 mill for a field development

Largest cost to an operator

*Forbes Oct 2015

Relief Well and Dynamic Kill Overview

After intersecting with a relief well a dynamic kill is done

Dynamic kill uses mud hydrostatic and friction to stop the

blowout

Deeper intersect makes the kill operation less challenging

There are limits to how deep a relief well can intersect

Intersect is often at the deepest casing shoe

Relief wells are the last line of defense

DOWNHOLE RANGING REQUIRES STEEL IN TARGET WELL

• Pumping capacity of a relief well is limited

• Two or more relief wells may be required

• Only once have two simultaneous relief wells intersected a blowout

• Two simultaneous relief wells may be challenging*

• Permission from regulatory agency

• Kill requirements sometime drive the well design

Relief Well and Dynamic Kill Overview

Relief wells are unique and challenging

2014 IADC - Dual Relief Well Operations – Challenges and Solutions

El Isba, Syria 1995 Artic Environment

Casing Design Driven by Kill Requirements

Kill requirements are conservative

(wildcat wells)

Additional casing is set to isolate sands

Some sands may not be prolific

Introduce additional cost

Additional risk

Example 1 – Multiple Sands

Example 2 – Big Bore Gas Wells

*SPE-174890-MS: Blowout Prevention and Relief Well Planning for the Wheatstone Big-Bore Gas Well Project

Off-bottom kill may not be possible

Extra string must be set above reservoir*

Smaller hole = smaller completion

Need more wells to develop a field

Casing Design Driven by Kill Requirements

Simulation While Drilling, SWD

SWD has been used on several wells and already demonstrated

its value to the industry

SWD forecasts kick tolerance and RW kill requirements real-time

Drill the entire reservoir zone

Significant cost reducing potential

Shorter drilling time

Reduced number of casing strings

Ensuring successful well integrity management

REAL-TIME DATA

Relief Well Injection Spool, RWIS

RWIS is patent pending - Expected completion time is

Q4 2016

Sits between the wellhead and the BOP and same bore as the BOP

(18 ¾")

The RWIS will include valve inlets for pumping and pipe/shear ram

The kill spool is a “dead” equipment during drilling of the relief well

The kill spool could be used to increase pump capacity into the well

RWIS is a “Mini BOP Stack”, mounted on top of the relief well wellhead

Relief Well Injection Spool, RWIS

STEP 1 – Drill Upper Hole Section

Blo

w O

ut W

ell

Last Shoe Before Intercept

LMRP

BOP

Wellhead

Relief Well Rig

Relief Well Injection Spool, RWIS

STEP 2 – Pull BOP and Install RWIS Unit

Blo

w O

ut W

ell

Last Shoe Before Intercept

LMRP

BOP

Wellhead

Relief Well Rig

Relief Well Injection Spool, RWIS

STEP 2 – Pull BOP and Install RWIS Unit

Blo

w O

ut W

ell

Last Shoe Before Intercept

Wellhead

LMRP

BOP

Relief Well Rig

Relief Well Injection Spool, RWIS

STEP 2 – Pull BOP and Install RWIS Unit

Blo

w O

ut W

ell

Last Shoe Before Intercept

Wellhead

LMRP

BOP

Relief Well Rig

RWIS

Relief Well Injection Spool, RWIS

Blo

w O

ut W

ell

Last Shoe Before Intercept

Wellhead

STEP 3 – Reconnect Relief Well rig to well landing BOP onto RWIS

LMRP

BOP

Relief Well Rig

RWIS

Relief Well Injection Spool, RWIS

Blo

w O

ut W

ell

Last Shoe Before Intercept

Wellhead

STEP 4 – Attach Kill Vessel(s) to RWIS

LMRP

BOP

Relief Well Rig

RWIS

Relief Well Injection Spool, RWIS

Blo

w O

ut W

ell

Last Shoe Before Intercept

Wellhead

STEP 5 – Drill out of shoe and intercept incident well

LMRP

BOP

Relief Well Rig

RWIS

Relief Well Injection Spool, RWIS

Blo

w O

ut W

ell

Last Shoe Before Intercept

Wellhead

STEP 6 – Conduct Well Kill operations from designated vessels

LMRP

BOP

Relief Well Rig

Relief Well Injection Spool, RWIS

Blo

w O

ut W

ell

Last Shoe Before Intercept

Wellhead

STEP 7 – High rate dynamic kill achieved

LMRP

BOP

Relief Well Rig

Well Killed

Relief Well Injection Spool Benefits

No rig modifications required

Enables relocation of pumping and storage off the rig to dedicated

pumping vessels

Increases flow capacity to the wellhead significantly

Alternative to two or more relief wells

Intersect blowout shallower, in less time, and limit spill potential

Give operators permission to drill in environmental sensitive areas

Casing Design Driven by Kill Requirements

SWD is used to calculate kick tolerance and

kill requirements real-time

SWD may reduce number of casing strings

while mitigating risk

RWIS is a contingency in the unlikely case of a

blowout from multiple sands

RWIS ensures a blowout can be killed with a

single relief well

Cost savings per string is ~USD 2 mill

Example 1 – Multiple Sands

Solutions: RWIS and SWD

Example 2 – Big Bore Gas Wells

*IADC July/August 2005: Shell, Norsk Hydro to drill world’s largest deepwater wells in Ormen Lange field

With RWIS an off-bottom kill may be possible

Extra string set above reservoir may be

eliminated

Bigger hole = larger completion

A large field can be developed with less wells

Ormen Lange Phase 1: Fourteen 7” wells match

eight 9⅝” wells = $300 million savings*

Cost reduction ~USD 50 mill per Big Bore well

Casing Design Driven by Kill Requirements Solutions: RWIS and SWD

Well Control & Blowout Support

Blowout contingency planning

Blowout and well control response

Simulations while drilling

Casing magnetization

Transient multiphase flow analyses

Well control courses, training and spill drills

Montara/Timor Sea – Blowout 2009

Macondo/US Gulf – Blowout 2010

Elgin/North Sea – Blowout 2012

Porter Ranch – Blowout 2016

Key Projects

We offer expert advice in blowout prevention and response in the event of a well control incident

Thank You

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