PACIFIC OPERATORS OFFSHORE, INC.

CARPINTERIA FIELD

CARPINTERIA FIELDOFFSHORE CALIFORNIA

(Reprinted in Sylvester and Brown, 1997, Coast Geological Society)

Platform HoganPlatform Houchin

RINCON TRENDSTRUCTURE CONTOURS

OCS-P 0240 OCS-P 0166

Cal. PRC 7911

Cal. PRC 3133

Cal. PRC 4000

HENRYHOUCHIN

HOGAN

HOPEHEIDI

AREA OF INITIALREDEVELOPMENT

CARPINTERIA OFFSHORE FIELD

3-D MODEL OF CARPINTERIA FIELDVIEW LOOKS NORTHEAST

3-D MODEL SHOWING HOBSON FAULTVIEW LOOKS SOUTHEAST

LONGITUDINAL SECTION THROUGH

CAPRINTERIA FIELD

WEST EASTPLATFORM HOGAN

PLATFORM HOGAN

PLATFORM HOUCHIN

STRUCTURE CONTOURS ON TOP F1 ZONECONTOUR INTERVAL 100 FT

OCS-P 0166

PRC 4000

PRC 7911

VENTURA BASINSTRATIGRAPHIC COLUMN

SH

OW

SS

HO

WS

PRODUCEDPRODUCED

MA

IN P

RO

DU

CT

IVE

IN

TE

RV

AL

MA

IN P

RO

DU

CT

IVE

IN

TE

RV

AL

SE

CT

ION

PE

NE

TR

AT

ED

AT

CA

RP

INT

ER

IA F

IEL

D

PL

EIS

TO

CE

NE

PL

IOC

EN

EM

IOC

EN

E

OL

IG.

EO

CE

NE

UK

“F” S

ER

IES

“G” S

ER

IES

“E” S

ER

IES

PLATFORM HOGAN

CARPINTERIA FIELD TYPE LOG

PLATFORM HOGAN

10000

100000

1000000

Jun-6

8

Jun-7

0

Jun-7

2

Jun-7

4

Jun-7

6

Jun-7

8

Jun-8

0

Jun-8

2

Jun-8

4

Jun-8

6

Jun-8

8

Jun-9

0

LO

GA

RIT

HM

IC P

RO

DU

CT

ION

(B

bls

/mo

)

OIL

WATER

PURCHASE BY SIGNAL18,738 Bbl/mo

July, 1990

PEAK PRODUCTION403,934 Bbl/moOctober, 1968

HOGAN MONTHLY PRODUCTION BEFORE PURCHASE

OPPORTUNITIES

Workovers

Continue conversion from gas lift to rod pumps

Waterflood

by 1993…. Strategic redrilling

GEOLOGIC CHALLENGES

Co-mingled production Hard to allocate production among zones

Sparse core data Most porosity/permeability data from logs

Sparse pressure data Can’t use pressure regimes to establish fault blocks

Few dipmeters Little help in locating faults

Inclined oil/water contacts Confuses fault interpretation

Carpinteria FieldF-Series Oil/Water Contacts

-4000

-3800

-3600

-3400

-3200

-3000

-2800

-2600

-2400

-2200

998000 1000000 1002000 1004000 1006000 1008000 1010000 1012000 1014000 1016000

Zone 6 X-value

Su

bse

a D

ep

th

F1

F2

F2A

F3

F4

F5

F6

STATE LEASESP-0166P-0240

CARPINTERIA FIELDOIL-WATER CONTACTS

STRATEGIES Improve production with workovers/RTPs Prepare for waterflood and redrills

Geologic and petrophysical studies

Participate in Department of Energy programs Advanced Reservoir Management project - geologic and

reservoir studies Class III - financial assistance with redrills

Leverage resources through technology Digitize well logs and field reports Link employees and consultants electronically Use 3-D computer modeling

CARPINTERIA PROJECT

Detailed Log CorrelationUsing True Stratigraphic

Thickness Traces in AutoCad-LT

1 0 0 0 0 0 0 1 0 0 5 0 0 0 1 0 1 0 0 0 0

8 0 4 0 0 0

8 0 6 0 0 0

8 0 8 0 0 0

FULL OIL COLUMN

OIL / WATER CONTACT

WET INTERVAL

Direction of Axial Plunge

PROBABLE FAULT

SATURATION CONDITION OF F4 ZONE WELLS

A52

CONTOURS ON TOP F1and

CONTOURS ON F1 O/W CONTACT

Lease P-0166

AREA 1

AREA 2

PLANNED REDRILL WELL PATHA48WB01 F1 ZONE

3 D MODEL VIEW OF 1999CARPINTERIA FIELDREDRILL PROGRAM

WELLS

RELATIONSHIP OF REDRILL PROGRAM TO EXISTING WELLSEAST HOGAN AREA

REDRILL BOREHOLE

EXISTING BOREHOLE

COLLISION AVOIDANCE USING 3-D MODEL

Carpinteria Field

Location

CARPINTERIA FIELDDEPOSITIONAL SETTING

F3

ZO

NE

SP RESISTIVITY

EXAMPLE DUAL INDUCTION LOGWell A48 Zone F3

SAND

SHALE

Fault

F3 Zone

CROSS SECTION ALONG PATH OF REDRILLA49WB01

Platform Hogan

Zone F1Zone F2Zone F3Multiple zones

A49WB01A43WB01

A44WB02

A14WB01

A22WB01

A48WB02

RESULTS OF 1998 REDRILL PROGRAMSHOWING REDRILL TRAJECTORIES

AND COMPLETED INTERVALS

PLATFORM HOGAN

10000

100000

LO

GA

RIT

HM

IC P

RO

DU

CT

ION

(B

bls

/mo

)

PURCHASE

REDRILL PROGRAM14,721 Bbl/mo Increase

HOGAN MONTHLY PRODUCTION SINCE PURCHASE

WHAT’S NEXT?

MORE THAN 30 SIMILAR REDRILL PROJECTS ARE AVAILABLE FROM PLATFORMS HOGAN AND HOUCHIN

GRASS ROOTS HORIZONTALS ARE BEING STUDIED BELOW HOBSON FAULT AND INTO NEIGHBORING STATE LEASES

DEEP POSSIBILITIES EXIST IN OLDER MIOCENE SECTIONS

NOT THE END……..