driiling sequencxxe costs

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DRILLING SEQUENCE

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I. TOP HOLE DRILLING

• REFERS TO THE SHALLOW SECTION OF THE WELL NORMALLY HAVING UNCONSOLIDATED FORMATIONS

• A BASE IS PREPARED• CELLAR FOR LAND OPERATIONS

• FIRST HOLE DRILLED AND CONDUCTOR CEMENTED OR FIRST CASING PILE DRIVEN FOR BOTH ONSHORE & OFFSHORE. [THIS STRING PROVIDES A BASE FOR THE DIVERTER]

• SURFACE HOLE IS DRILLED AND THE SURFACE CASING RUN AND CEMENTED [SURFACE CASING PROVIDES A BASE FOR THE BOP PACKAGE AND PROTECTION FOR POTABLE WATER ZONES].

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2

II. INTERMEDIATE & RESERVOIR SECTION.

• REFERS TO THE SECTION OF THE WELL BETWEEN SURFACE TO THE RESERVOIR SECTION(S)

• INTERMEDIATE CASING IS SET ABOVE RESERVOIR.

• PRODUCTION CASING IS SET ACROSS RESERVOIR SECTION

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Drilling Operations - Making Holes

Typical Sequence of Operations :• Rig up

Sea level Conductordepth reference

Depth referencebelow derrick floor - bdfroller kelly bushing - rkb

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3

Install diverter

To diverter line

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Surface Casing

Drilling Fluid

Drill 17 1/2”hole

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4

BOP Diverter(to be removed)

13 3/8” Casing(still suspended from the drill floor)

13 3/8” Casingcemented to surface

13 3/8” Casing

Prepare to remove the diverter and excess casing

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13 3/8” Casing head

Fillet-Weld casing headto 13 3/8” casing

Side outlet valve

Install casing head housing

.

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5

BOP Stack

Ring joint flange connects BOP to

casing head

Mud Riser(allows drilling fluid

returns to mud system)

13-3/8” Casing

Install BOP stack and mud riser

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Drilling Fluidreturning up

annulus

13-3/8” Casing Shoe

Drill 12 1/4”hole section

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Intermediate CasingDrilling Fluid

Cement slurrybehind casing

and in shoe track

9-5/8” Casing

Cement

9 5/8” casing

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BOP Test Plug

Pressure test BOP stack

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8 1/2” Drilling assembly

9 5/8” Casing

Protection sleeve

Run 8 1/2”drilling assembly

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9-5/8” Casing shoe

Drill through cap rock(impermeable formation) intoreservoir

Sandstoneor

LimestoneDrill into reservoir

Shale

Continue drilling into the reservoir

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8

Run electric log�

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Run and cement the production casing

Production casing

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9

Casing scraper

Bit

Run bit and casing scraper to clean out casing

Production casing

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Perforate casing in selected production interval

Production casing

Perforations

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10

Install test string

Production casing

Production tubing

Production packer

Tail pipe

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Typical Casing Configurations

Conductor

Surfacecasing

Intermediatecasing

Production casing

Production liner

Functions1. Conductor (20”-30”) to protect loose, near

surface formations and enables circulation of drilling fluid

2. Surface casing (13-3/8”- 20”) to provide blowout protection and prevent loss circulation

3. Intermediate casing (9-5/8” - 16”) to isolate unstable hole section and loss circulation, low pressure and production zones (often set in the transition between normal to abnormal zone)

4. Production (4-1/2”-9-5/8”) to isolate production zone and contains formation pressure in the event of tubing leaks

5. Liner (4-1/2” - 13-3/8”) to improve hydraulic performance during deep drilling and to allow the use of larger tubing above the liner top

6. Tieback string to provide additional pressure integrity from the liner top to the wellhead

Tieback string

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TYPICAL SEQUENCE OF DRILLING OPERATIONS

Development Well - Jack-up or Tender Assisted• Position rig• Skid rig over slot• Clean out conductor• Set cement plug• Drill top hole (pilot hole if first well)• Set surface casing• Install & test BOP• Drill intermediate hole• Set intermediate casing• Install & test BOP• Drill production hole• Run logs• Set production casing• Complete well• Skid rig

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DATE OF COMPLETION : CASING :RIG : T-6 ( Tender Assisted) :TUBING : :X-MAS TREE :

PACKER FLUID : PBTD :RTE TO TBG HANGER :MAXIMUM DEVIATION :

FLOW COUPLINGSCSSV- TRSVFLOW COUPLING

X NIPPLE

FLOW COUPLINGSSDFLOW COUPLING

FLOW COUPLINGSSDFLOW COUPLING

BLAST JOINT

LOCATOR9-5/8" BWS PERM. PACKER

SBESEAL ASSYXN NIPPLECONICAL MULESHOE

EOT

3.000 3.920

SPM ( Dummy)

SPM ( Dummy)

SPM ( Dummy)

SPM ( Dummy)

14.1m ( RKB:33.9mMDDF )65.87. DEG @ mMDDF

EQUIPMENT

scavenger per 100bbls f iltered brine

CAMERON, DUAL 3-1/8" X 3-1/8" X 11", 5000PSINaCl treated w ith 4 gals DIOCIDE + 2 drums of C303 + 2 drums of Oxygen

SHORT STRING LONG STRING3-1/2", 9.2PPF, 9Cr-1Mo, AMS28 3-1/2", 9.2PPF, 9Cr-1Mo, AMS28

XN NIPPLLEPOP c/w CATCHER SUBEOT

9-5/8" BHD RET. PACKER

X NIPPLE

SPM ( Dummy)

SPM ( Dummy)

SPM ( Dummy)

SPM ( Dummy)

SCSSV - TRSVFLOW COUPLING

X NIPPLE

TYPICAL PCSB CONVENTIONAL DUAL OIL PRODUCER

FLOW COUPLING

9-5/8" 43.5PPF, N-80 @ 3422 mMDDF13-3/8" 54.5PPF,K-55 @ 1500 mMDDF26" DRIVE PIPE @ 185 mMDDF

~3422mMDDF

DEPTH

3-1/2", 9.2PPF, Carbon Steel, AMX28

mMMDF mMMDFDEPTH

MAX ODMIN IDIN IN

EQUIPMENT MAX ODIN

MIN IDIN

150.0

600.0

OP

OP/WI

160.0

600.0

3.9205.0303.920

3.960

5.310

5.310

5.310

5.310

3.960

8.457

3.9603.960

2.9002.8132.900

2.813

2.867

2.867

2.867

2.867

2.813

2.880

2.6902.964

2.9002.8132.900

2.813

2.867

2.867

2.867

2.867

2.9002.8132.900

2.9002.8132.900

2.900

2.8804.000

4.0002.8802.690

3.9205.0303.920

3.960

5.310

5.310

5.310

5.310

3.9204.4503.920

3.9204.4503.920

4.000

4.2508.120

5.0624.0003.960

I-35

HANGER

I-68

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Where thereWhere there’’s oil theres oil there’’s always Alligatorss always Alligators�

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DRILLING PROBLEMSa) Stuck pipe :-

Differential sticking.

Clay swelling.

Under gauge hole.

Well bore instability.

Key seating.

b) Lost circulations.

c) Equipment problems such as failures.

d) Presence of shallow gas.

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13

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Development of a Key Seat

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FISHING

• Fish is an object left in the well bore during drilling or work over that must be recovered before work can proceed.

• Eg. of fish – parted drill pipe, lost bit cones

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PETROLEUM ENGINEERING SKG-10

E & P CORE PROGRAM �PETRONAS

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TIME, COSTAND

CONTRACTS

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1111

2 3 4

56 7 8

910 11 1212

13 1414 151515 161616 1718 19192020

0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60

DAYS

0

1000

2000

3000

MEA

SUR

ED D

EPTH

(m-R

KB)

Plan

DEPTH VS DAYREHMAT-3

ATTACHMENT 4

No Activity Planned Days PlannedCumm Days Plan Depth

1 Rig up. 0.30 0.30 0.00

2 Drill 26" hole to section TD. 1.09 1.39 150.00

3 Run & cemet 20" csg. Install casing head 1.13 2.52 150.00

4 N/U Diverter System. 0.50 3.02 150.00

5 Drill 17-1/2" hole (take LOT) to section TD. 10.02 13.04 1550.00

6 Run logs 0.25 13.29 1550.00

7 Run & cemet 13-3/8" csg. 1.00 14.29 1550.00

8 N/D Diverter. N/U casing head. N/U BOP. 1.00 15.29 1550.00


10 Run logs 0.30 27.18 3000.00

11 Run & cemet 9-5/8" csg. 1.33 28.51 3000.00

12 N/D BOP. N/U Casing head. N/U BOP. 1.00 29.51 3000.00


14 Run logging tool+wiper trip+MDT/RFT 3.00 39.14 3600.00

15 Run & cemet 7" liner / casing 1.33 40.47 3600.00

16 P/U 3-1/2" DP. 1.00 41.47 3600.00

17 Clean well & displace well to brine 1.50 42.97 3600.00

18 R/U Schlumberger. Run CBL/VDL/CCL/GR logs. 0.50 43.47 3600.00

19 Perforate zones & Complete well & gravel pack 12.00 55.47 3600.00

20 N/D BOP & N/U X-mas tree & test 0.50 55.97 3600.00

Total Days 55.11 55.97



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DRILLING CHART

-3000

-2500

-2000

-1500

-1000

-500

00 5 10 15 20 25 30

TIME (DAYS)

DEP

TH (

M)

Mob

Drill 17 1/2”hole

Run & Cement 13 3/8”casing Drill 12 1/4” hole

Run & Cement 9 5/8”casing

Drill 8 1/2” hole

E-Log

Run & Cement 7”casing

Production Test

P&A

Demob

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• Actual well cost are divided into.Tangibles – casing, tubing, wellhead & x-mas tree, completion, etc.

Supplies – Drilling Fluid, cement, bit, fuel, etc.

Contracted – Rig, directional, e-log, mud log, stimulations, etc.

Allocation – salaries, transport, supply base, etc.

• This cost is further divided into Drilling, Completion, Formation Evaluation, rig operations, logistic, management and others.



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0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Cos

t (%

)

Misc. 5%

Logistics 10%

Rig Operations 25%

Form. Evaluation 15%

Testing 20%

Drilling 25%

COST BREAKDOWN -EXPLORATION WELLS

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COST BREAKDOWN -EXPLORATION WELLS

Cost Breakdown for a Development Well



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CONTRACTS

VARIOUS CONTRACTS FORM NORMALLY USED IN DRILLING:-

1. Unit (Day/monthly/piece) rate contract.2. Footage contract.3. Turnkey contract.4. Incentive contract.5. Partnering & Alliancing.

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Where thereWhere there’’s oil theres oil there’’s always Alligatorss always Alligators

THAT’S ALL

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