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Petroleum Engineering 648 — Pressure Transient Testing Lecture 1 — Introduction to Pressure DRAWDOWN Testing

Tom BLASINGAME | t-blasingame@tamu.edu | Texas A&M U.

Dak

e, L

. P.:

Fund

amen

tals

of R

eser

voir

Engi

neer

ing,

Els

evie

r (19

78).

Constant Rate Pressure DRAWDOWN Behavior: Dake

Slide — 1

Petroleum Engineering 648 — Pressure Transient Testing Lecture 1 — Introduction to Pressure DRAWDOWN Testing

Tom BLASINGAME | t-blasingame@tamu.edu | Texas A&M U.

Mat

thew

s, C

.S. a

nd R

usse

ll, D

.G.:

Pres

sure

Bui

ldup

and

Flo

w T

ests

in W

ells

, Mon

ogra

ph V

ol. 1

, SPE

(196

7).

Constant Rate Pressure DRAWDOWN Behavior — History Plot: Matthews and Russell

Slide — 2

Petroleum Engineering 648 — Pressure Transient Testing Lecture 1 — Introduction to Pressure DRAWDOWN Testing

Tom BLASINGAME | t-blasingame@tamu.edu | Texas A&M U.

Constant Rate Pressure DRAWDOWN Behavior — Flow Equations:

khqBm

src

kmpp

tmp

src

ktkhqBp

strc

kkhqBp

strc

kkhqBpp

rf

wtrfihr

rfhr

wti

wti

wtiwf

6.162

8686.02275.3log

log

8686.02275.3loglog6.162

8686.01688

1log6.162

21688

1ln6.70

21

1

2

2

2

hAcqBm

sCr

A

ekhqBpp

tmpp

thAcqBs

Cr

A

ekhqBpp

tpss

Awi

psswf

tAwiwf

23395.0

214ln6.70

23395.0214ln6.70

2int

int

2

Transient RADIAL Flow Relation: Pseudosteady-State Flow Relation:

Slide — 3

Petroleum Engineering 648 — Pressure Transient Testing Lecture 1 — Introduction to Pressure DRAWDOWN Testing

Tom BLASINGAME | t-blasingame@tamu.edu | Texas A&M U.

Mat

thew

s, C

.S. a

nd R

usse

ll, D

.G.:

Pres

sure

Bui

ldup

and

Flo

w T

ests

in W

ells

, Mon

ogra

ph V

ol. 1

, SPE

(196

7).

Constant Rate Pressure DRAWDOWN Behavior — Flow Equations:

hAcqBm

sCr

A

ekhqBpp

tmpp

tpss

Awi

psswf

23395.0

214ln6.70 2int

int

khqBm

src

kmpp

tmpp

rf

wtrfihr

rfhrwf

6.162

8686.02275.3log

log

21

1

No Analysis

Pseudosteady-State Flow:●Reservoir Volume. (only!)

Transient RADIAL Flow:●Formation Permeability (k).●Near-Well Skin Factor (s).

Slide — 4

Petroleum Engineering 648 — Pressure Transient Testing Lecture 1 — Introduction to Pressure DRAWDOWN Testing

Tom BLASINGAME | t-blasingame@tamu.edu | Texas A&M U.

Mat

thew

s, C

.S. a

nd R

usse

ll, D

.G.:

Pres

sure

Bui

ldup

and

Flo

w T

ests

in W

ells

, Mon

ogra

ph V

ol. 1

, SPE

(196

7).

Constant Rate Pressure DRAWDOWN Behavior — Semilog Plot: Matthews and Russell

Slide — 5

Petroleum Engineering 648 — Pressure Transient Testing Lecture 1 — Introduction to Pressure DRAWDOWN Testing

Tom BLASINGAME | t-blasingame@tamu.edu | Texas A&M U.

Earlo

ughe

r, R

.C.,

Jr.:

Adv

ance

s in

Wel

l Tes

t Ana

lysi

s, M

onog

raph

Vol

. 5, S

PE (1

977)

.Constant Rate Pressure DRAWDOWN Behavior — Various Plots: Earlougher

Plot Inventory:●History (or Strip) Plot.●Log-Log Plot.●Semilog Plot.

History Plot:

Log-Log Plot:

Semilog Plot:

Slide — 6

Petroleum Engineering 648 — Pressure Transient Testing Lecture 1 — Introduction to Pressure DRAWDOWN Testing

Tom BLASINGAME | t-blasingame@tamu.edu | Texas A&M U.

Mat

thew

s, C

.S. a

nd R

usse

ll, D

.G.:

Pres

sure

Bui

ldup

and

Flo

w T

ests

in W

ells

, Mon

ogra

ph V

ol. 1

, SPE

(196

7).

Constant Rate Pressure DRAWDOWN Behavior — Muddy Sandstone Example: Matthews and Russell

Slide — 7

Petroleum Engineering 648 — Pressure Transient Testing Lecture 1 — Introduction to Pressure DRAWDOWN Testing

Tom BLASINGAME | t-blasingame@tamu.edu | Texas A&M U.

Mat

thew

s, C

.S. a

nd R

usse

ll, D

.G.:

Pres

sure

Bui

ldup

and

Flo

w T

ests

in W

ells

, Mon

ogra

ph V

ol. 1

, SPE

(196

7).

Boundary-Dominated Flow Concept: Matthews and Russell

Numbers indicate approximate relative production rates of wells;each well drains an area proportional to its rate.

Red

lines

indi

cate

app

roxi

mat

e "d

rain

age

boun

darie

s."

Slide — 8

Petroleum Engineering 648 — Pressure Transient Testing Lecture 1 — Introduction to Pressure DRAWDOWN Testing

Tom BLASINGAME | t-blasingame@tamu.edu | Texas A&M U.

Mat

thew

s, C

.S. a

nd R

usse

ll, D

.G.:

Pres

sure

Bui

ldup

and

Flo

w T

ests

in W

ells

, Mon

ogra

ph V

ol. 1

, SPE

(196

7).

Earlo

ughe

r, R

.C.,

Jr.:

Adv

ance

s in

Wel

l Tes

t Ana

lysi

s, M

onog

raph

Vol

. 5, S

PE (1

977)

,Average Reservoir Pressure — Example: Matthews and Russell/Earlougher

wsws

ws

ptd

bpp

tbapp

1

)exp(

Slide — 9

Petroleum Engineering 648 — Pressure Transient Testing Lecture 1 — Introduction to Pressure DRAWDOWN Testing

Tom BLASINGAME | t-blasingame@tamu.edu | Texas A&M U.

Average Reservoir Pressure — Concept Example: DakeD

ake,

L. P

.: Fu

ndam

enta

ls o

f Res

ervo

ir En

gine

erin

g, E

lsev

ier (

1978

).

Slide — 10

Petroleum Engineering 648 — Pressure Transient Testing Lecture 1 — Introduction to Pressure DRAWDOWN Testing

Tom BLASINGAME | t-blasingame@tamu.edu | Texas A&M U.

Mat

thew

s, C

.S. a

nd R

usse

ll, D

.G.:

Pres

sure

Bui

ldup

and

Flo

w T

ests

in W

ells

, Mon

ogra

ph V

ol. 1

, SPE

(196

7).

Well Interference — Example: Matthews and Russell

Slide — 11