field development planning

8/3/2019 Field Development Planning

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Field development planning


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Field development planning

FDP

enable the rapid evaluation of a large numberof development options

handle many interfaces between the differentelements of a field development effectively

improve confidence in and consistency of the

results enable rapid and rigorous evaluation of

sensitivities to a concept


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FDP activity

It comprises a number of linked activities drilling

substructures

subsea topsides

pipelines

onshore terminals onshore plants

onshore gathering systems


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Drilling


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Reverse engineering

Normal workflow

Know surface location

Know target location

Know reservoir trajectory requirement

Design well

FDP workflow

Possibly know target locations Possibly know reservoir trajectory requirement

THEN IT ALL CHANGES ANYWAY


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Well Profile Design

There are still an infinite number of waysto join a surface location with a downholetarget

Even if up is not an option


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Client requirement

Define a scope of work

Define well placement requirements

Reservoir exposure

Reservoir placement

Target penetration

All of the above with a stated accuracy

Survey programme at reasonable cost


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Client requirement

Design multi-well exit

Join the top to the bottom in the best way

What is the best way? Depends on production requirement

Linkage to WBS

Tools available


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Well Profile 2D

This works a profile in TVD and on asingle azimuth

Dimension 1 is TVD

Dimension 2 is reach

For example the following slide has someprofiles for a target displacement of 1000m

at a 1750m tvd


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Well Profile 2D

0 200 400 600 800 1000 1200 1 400 1600 1800 2000 2 200

0

200

400

600

800

1000

1200

1400

1600

1800

2d-30deg2d-10deg 2d-60deg2d-45deg 2d-75deg2d-90deg


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Key points in a well design

1. Rig floor

2. Tie-in

3. Wellhead

4. MSL5. Seabed or groundlevel

6. WRP

7. All casing depths

8. KOP9. BUR

10. EOB

11.Grid azimuth

12.Lead angle

13. Tangent angle

14.Measured depth15. True vertical depth

16.Displacement

17. Closure

18. VSD19. Target location(s)

20. TD


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Special key points

1. 2nd KOP

2. 2nd BUR

3. EO 2ndB

4. DOP

5. DOR

6. EOD

7. TR

8. BR

There are some differentways of describing alocation

Geographic co-ordinates Grid co-ordinates

Rectangular co-ordinates

Polar co-ordinates


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Slant (departure > R)

Given: Wellhead coordinates Target coordinates Target TVD, V3

To determine: KOP vertical depth, V1 Build up rate, BUR

KOP Kick-off point. V1 TVD of straight section/surface

to KOP. V2 TVD of end of build up. V2 - V1 TVD of Build up section

with BUR corresponding to radiusof curvature R.

V3 - V2 TVD of Tangent section tototal depth.

D1 Displacement at end of buildup.

D2 Total horizontal displacementof target.

Maximum inclination of well.

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Slant (R > departure)

Given: Wellhead coordinates

Target coordinates Target TVD, V3

To determine: KOP vertical depth, V1

Build up rate, BUR KOP Kick-off point.

V1 TVD of straight section/surface toKOP.

V2 TVD of end of build up. V2 -V1 TVD of Build up section with

BUR corresponding to radius of curvature R.

V3 - V2 TVD of Tangent section tototal depth.

D1 Displacement at end of build up. D2 Total horizontal displacement of

target. Maximum inclination of well.

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S-shaped (R1 + R2) < total target displacement



Build up rate, BUR

Drop off rate, DOR Vertical depth at end of drop, V4

KOP Kick-off point.

V1 TVD of straight section/surface to KOP. V2 TVD of end of build up. V3 TVD of start of drop.

V4 TVD of end of drop. V2 - V1 TVD of Build up section with BUR

corresponding to radius of curvature R1.

V3 - V2 TVD of Tangent section. V4 - V3 TVD of drop section D1 Displacement at end of build up.

D2 Displacement at end of tangent D3 Total horizontal displacement of target. Maximum inclination of well.

15


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S-shaped (R1 + R2) > total target displacement



Build up rate, BUR

Drop off rate, DOR Vertical depth at end of drop, V4

KOP Kick-off point.

V1 VD of straight section/surface to KOP. V2 VD of end of build up. V3 VD of start of drop.

V4 VD of end of drop. V2 - V1 TVD of Build up section with BUR

corresponding to radius of curvature R1.

V3 -V2 TVD of Tangent section. V4 -V3 TVD of drop section. D1 Displacement at end of build up.

D2 Displacement at end of tangent. D3 Total horizontal displacement of target. Maximum inclination of well.

16


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Well Profile 3D

This works a profile out in full 3 dimensionalspace Dimension 1 is TVD

Dimension 2 is North Dimension 3 is East

Using minimum curvature to design wells bysection

Lead angles

Dogleg limitations by formation

Tangent section requirements


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Well Profile 3D

Azimuthal changes

Same dogleg severity

Lead angles needed

Increasing MDs


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Well Profile wavy

vs

0

200

400

600

800

1000

1200

1400

1600

1800

2000

-400 -200 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 4400

vs disp

tvd


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Well Profile snake

0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600

0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600

-1000

-800

-600

-400

-200

0

200

400

600

800

-1000

-800

-600

-400

-200

0

200

400

600

800

90deg 3000m horizontal snake

1500 +1000

Target 1500

1500 +2000

1500 +3000


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S/Sn/W 3D view

Straight horizontal

No dogleg

Snaky horizontal Azimuth seeking

Wavy horizontal

Inclination seeking


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FDP

The unknown is the surface location


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Optimised Surface Location


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Techniques

Drilling radius

Extremities

Averages

RMS

Software

MEM considerations


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Drilling Radius - considerations

Rig specific Rig capabilities and

capacities

Pull

Rotate

Pump

Well profile derived KOP

DLS

TD tvd

Well trajectorycomplexity

Drilling Mechanics

Well purpose limited

Drillability

Completeabiltiy

Workover potential


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Radius use

Well Grid

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

East

North


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Radius use

Well Grid

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

East

North


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FDPJ wells max 60 inclination


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Maximum Hole angle considered@ 60


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Radius use

Well Grid

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

East

North


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FDPJ wells max 75 inclination


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Maximum Hole angle considered@ 75


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FDPS wells max 60 inclination


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Maximum Hole angle considered@ 60S well


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Cost minimisation using drillingradius

If all targets fit within a single radius then thedrillsite location is going to be pretty close tooptimal.

When > 1 site is required then there is no attemptmade to minimise drilled distance and/or cost

Profiles for all wells inside the drilling diameterneed to be separately calculated

This method can handle J and S wells; providedthe radius is determined for both as each has its

drilling difficulties.


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Extremities

Well Target locations

0

1000

2000

3000

4000

5000

6000

0 1000 2000 3000 4000 5000 6000

East (m)

North(m)

3000m North, 3400m East


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Averages


0

1000

2000

3000

4000

5000

6000

0 1000 2000 3000 4000 5000 6000

East (m)

North(m)



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RMS


0

1000

2000

3000

4000

5000

6000

0 1000 2000 3000 4000 5000 6000

East (m)

North(m)



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Software solution and shortcoming


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Optimised for cost


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Horizontal Designer wells

Horizontal Well Locations

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

East

North

well 1

well 2

well 3

well 4

well 5well 6

well 7

well 8

well 9


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Horizontal and designer wells

Best process Single location

Size the longest well and match to Rig capability

If, which is more than likely, the longest well is

beyond the Rig, then we have to introduce asecond surface location

Same process repeats until we get all wells in a drillableorder

Here also we might consider a preferred direction of

wellbore to make the initial selection point or, look at the more realistic well profile and keep the

heel point at the shallowest TVDthis dictate the heel-toe order and thus the best surface location


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Single surface location - example


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Single surface location - example


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All wells aligned


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2 surface location solution

T k ll ll l 60


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To keep all well tangent angle 60or less


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Deliverables

Well profile only for input to:

Separate engineering applications

Integrated application to produce:

High level engineering statement of requirements

Times

Costs

Risks and probability of success

Outline drilling forecasting


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End of Module

field development planning

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