reeves oilfield service' company: compact chartbook

8/10/2019 Reeves Oilfield Service' Company: Compact ChartBook

1/20

2Issue

Reeves Oilfield Services

CompactChartBook

COMPACT LOGGING

Revised April 2003


2/20

c Reeves Technologies

Gam - 3

Use this chart to correct Gamma Ray logs from Compact series tools for the effects of borehole size and mud weight.The standard condition is an eccentred tool in a 203 mm ( 8 inch ) diameter well with KClfree mud of density 1.2gm/cm . Corrections for non-standard conditions are approximatedby:

3

where d = caliper in inches

f = mud density in gm/cm 3

for centred tools

for eccentred tools

KCl free muds.

Gamma Ray Borehole Correction

Applicability: Compact Series ( MCG & MGS ) tools.

GR /GR(corr) (log) exp 0.35= 0.75 f d - 2.255.75( )GR /GR(corr) (log) f = 1.75 - exp -0.24

d - 2.255.75( )

G R

/ G R

( c o r r )

( l o g )

5.0

4.0

3.0

2.0

1.00.90.80.7

0.6

0.52 4 6 8 10 12 14

Borehole Diameter ( inches )

1.0

2.0f

100 150 200 250 300 350Borehole Diameter ( mm )

Centred

Eccentred

Air holes

1.21.4

1.61.8

2.0

1.0

f ( gm/cm )3


3/20


Ind - 10

2 4 6 8 10 12-0.01

0.0

0.01

0.02

0.03

0.04

B o r e h o l e G e o m e t r i c F a c t o r

Borehole Diameter ( in )

Borehole Diameter ( mm )50 100 150 200 250 300

Standoff ins ( mm )

0.0 ( 0 )

0.5 ( 13 )

1.0 ( 25 )

1.5 ( 38 )

2.0 ( 51 )

Field logs are corrected for bit size, nominal standoff and borehole fluid salinity.

Corrections are applied to each sub-array. The chart shows the compositecorrection after construction of the Shallow output curve.

If borehole conditions depart significantly from nominal, new borehole correctionsmay be computed and applied to the processed logs after first removing the fieldcorrections.

Borehole corrected conductivities are given by:

Where is the apparent conductivity, the borehole fluid conductivity,and the borehole geometric factor.

app mg b

corr app mg b

g b=

1--

Array Induction Borehole Correction - Shallow

Applicability: Compact Series ( MAI ) tools.


4/20


Ind - 11

2 4 6 8 10 12-0.002

0.0

0.002

0.004

0.006

0.008




Standoff ins ( mm )

0.0 ( 0 )

0.5 ( 13 )

1.0 ( 25 )

1.5 ( 38 )

2.0 ( 51 )

Array Induction Borehole Correction - Medium



Corrections are applied to each sub-array. The chart shows the compositecorrection after construction of the Medium output curve.




app mg b

corr app mg b

g b=

1--


5/20


Ind - 12

2 4 6 8 10 12-0.001

0.0

0.001

0.002

0.003

0.004




Standoff ins ( mm )

Standoff ins ( mm )

0.0 ( 0 )

0.5 ( 13 )

1.5 ( 38 )

2.0 ( 51 )

Array Induction Borehole Correction - Deep



Corrections are applied to each sub-array. The chart shows the compositecorrection after construction of the Deep output curve.




app mg b

corr app mg b

g b=

1--


6/20


Lat - 4

Compact Deep Laterolog Borehole Correction

Applicability: Compact Series ( MDL ) tools, Operating Mode A.

Standard condition is 13 mm ( 0.5 inch ) standoff in a 200 mm ( 8 inch )

well, Ra/Rm = 20.

1 10 100 10,0001,000

1.6

1.4

1.2

1.0

0.8

0.6R / RLLD m

R

/ R

L L D ( C o r r )

L L D

1 10 100 10,0001,000

1.6

1.4

1.2

1.0

0.8

0.6

R / RLLD m

R

/ R

L L D ( C o r r )

L L D

1 10 100 10,0001,000

1.6

1.4

1.2

1.0

0.8

0.6

R / RLLD m

R

/ R

L L D ( C o r r )

L L D

64

810

16

150100

200 250 300

Borehole Diameterins mm

12 14 350 400

Centred

38 mm (1.5 inch) Standoff


6

64

8

8

10

10

16

16

150

150100

200

200

250

250

300

300

Borehole Diameter

Borehole Diameter

ins

ins

mm

mm

12

12

14

14

350

350

400

400


7/20


Lat - 5

Compact Shallow Laterolog Borehole Correction

Applicability: Compact Series (MDL) tools, Operating Mode A.

1 10 100 10,0001,000

1.6

1.4

1.2

1.0

0.8

0.6R / RLLS m

R

/ R

L L S ( C o r r )

L L S

1 10 100 10,0001,000

1.6

1.4

1.2

1.0

0.8

0.6

R / RLLS m

R

/ R

L L S ( C o r r )

L L S

1 10 100 10,0001,000

1.6

1.4

1.2

1.0

0.8

0.6

R / RLLS m

R

/ R

L L S ( C o r r )

L L S

64

810

16

150100

200250300

Borehole Diameterins mm

1214 350

400

Centred



16

16

14

14

12

12

10

10

8

8

6

6

150

150

200

200

250

250

300

300

350

350

400

400

Borehole Diameter

Borehole Diameter

mm

mm

ins

ins

4100

Standard condition is 13 mm ( 0.5 inch ) standoff in a 200 mm ( 8 inch )

well, Ra/Rm = 20.


8/20

Compact Dual Laterolog Tornado Chart

Applicability: Compact Series (MDL) tools. Operating Mode A.Thick beds, 8 inch ( 203 mm ) hole, step invasion profile, Rxo/Rm = 50.Use Borehole corrected data.


Lat - 6

1.0 2 3 4 5 10 20 30 40 500.4 0.6 0.80.2

0.3

0.4

0.5

0.6

0.8

1.0

2

3

4

5

6

8

10

20

30

40

50

60

80100

R / RLLD LLS

R

/ R

L L D

x o

100

0.4

0.2

30 40 50 6080

120R tRxo

D ( inches )i

R tRLLD 100

70

50

30

20

10

15

7

5

3

2

1.5

1.2 1.3 1.41.6 1.8

20


9/20

Compact Dual Laterolog Tornado Chart

Applicability: Compact (MDL) series tools. CML operating mode.Thick beds, 8 inch ( 203 mm ) hole, step invasion profile, Rxo/Rm = 50Use Borehole corrected data.


Lat - 7

1.0 2 3 4 5 10 20 30 40 500.4 0.6 0.80.2

0.3

0.4

0.5

0.6

0.8

1.0

2

3

4

5

6

8

10

20

30

40

50

60

80100

R / RLLD LLS

R

/ R

L L D

x o

100

0.4

0.2

30 40 50 6080

120

R tRxo

D ( inches )i

R tRLLD 100

70

50

30

20

10

15

7

5

3

2

1.11.2

1.3 1.4 1.61.51.8

20


10/20


SFE - 2

Corrections are approximated by: R / R = a + a x + a x + a x +.....FEFR (Corr) FEFR 0 1 2 2 3 3

where x = ln(R /R ). Coefficients for 4,6,8,10 and 12 inch wells are (left to right):FEFR m

1.00000000.3515411

-0.1259589

0.0209587-0.00183410.0000652

1.00000000.5245657

-0.2158732

0.0404045-0.00372540.0001324

1.00000000.6591658

-0.2848466

0.0570030-0.00567880.0002223

1.00000000.7950933

-0.4006034

0.1119412-0.01722750.0010960

1.00000000.9368961

-0.4659671

0.1453734-0.02866250.0026412

a0a1a2

a3a4a5

C e n t r e d

10.1 10 100 10,0001,000

RFEFR / Rm

R

/ R

F E F

R ( C

o r r )

F E F R

Centred

1.6

1.4

1.2

1.0

0.8

0.6

1.8

2.0

2.2

2.4

0.4

68

10

4150200250

300

ins mm

12

100

Borehole Diameter

The Corrected Shallow Resistivity curve FEFE has been corrected for bit size and Rm. To apply

an alternative correction, enter the chart using the Raw Shallow Resistivity curve FEFR.

Compact Focussed Electric Borehole Correction

Applicability: Compact Series ( MFE ) tools.


11/20


12/20


Npor - 6a

0 10 20 30 40 50 Apparent Limestone Porosity Units

0 10 20 30 40 50

Pressure(kpsi)

05

1510

2025

50

100150200250300

Temperature( F)o

Mud Weight(lb/US gal)

naturalbarite 8

101214

1618

050

100150200250

B o r e h o l e S a l i n i t y

( k p p m )

164 8 12

0

1

2

3

M u l t i p l i e r

Hole Size (ins)

0 10 20 30 40 50

Standard condition

00.51.01.52.02.5

S t a n d o f f ( i n s )

4 8 12 16

0.50

1.0

1.5

2.0

M u l t i p l i e r

Hole Size (ins)

2.5 1.50.5

Standoff

Corrected Porosity Units

Neutron Porosity Environmental Corrections

Applicability: Open hole logs from Compact Series (MDN) tools.

4

86

1210

1416

Borehole Size(ins)


13/20


14/20


Npor - 7

0 10 20 30 40 50Environmentally Corrected Neutron Porosity ( pu )

010

20

30

4050

6070

0 10 20 30 40 500

10

20

30

405060

70

010

20

30

40

50

6070

SandstoneFormations

ma ( cu )

LimestoneFormations

ma ( cu )

DolomiteFormations

ma ( cu )

Standard condition

= (-2.51a + 11.34a - 8.83) .(0.08 exp(-0.04 ) + 0.05)2

= (-1.37a + 8.78a - 7.41) .(0.08 exp(-0.045 ) + 0.25)2

= (-7.09a + 16.98a - 9.89) .(0.11 exp(-0.06 ) + 0.20)2

where: = borehole corrected neutron porosity in appropriate matrix unitsand a = mama(std) /

ma(std) = 4.26, 7.10 and 4.70 cu respectively for standard sand, lime and dolomite.and

Use the appropriate nomogram to deduce corrections for variations in matrix sigma values.Sigma corrections associated with variations in formation fluid salinity are specified in ChartNpor - 8. Matrix sigma corrections are given by:

sandlimedolomite

Neutron Porosity Matrix Cross Section Correction

Applicability: Open hole logs from Compact Series ( MDN ) tools.


15/20


Npor - 8

0 10 20 30 40 50

0 10 20 30 40 50

Environmentally Corrected Neutron Porosity ( pu )

Standard condition

Use the appropriate nomogram to deduce corrections for variations in formation salinity. If the matrix cross section is known, a correction should first be made using Chart Npor-7.Salinity corrections are approximated by:

Neutron Porosity Formation Salinity Corrections

Applicability: Open hole logs from Compact Series ( MDN ) tools.

250200150100

500

SandstoneFormations

Salinity (kppm)

250200150100

500

LimestoneFormations

Salinity (kppm)

250200

15010050

0

DolomiteFormations

Salinity (kppm)

where: = borehole corrected neutron porosity in appropriate matrix units

sand 2 2= (-0.07 +2.0 -3.0) .kppm .10 + (0.031 - 0.4 +1.0) .kppm .10- (1.4 +2.0) .kppm .10

3 -8 2 -5

-3

lime 2 2= (-0.066 +3.0 -1.0) .kppm .10 + (0.024 - 0.6 +1.2) .kppm .10- ( +1.0) .kppm .10

3 -8 2 -5

-3

dolomite 2 2= (-0.02 +0.4 -1.0) .kppm .10 + (0.022 - 0.1 +1.0) .kppm .10- (2.0 +2.0) .kppm .10

3 -8 2 -5

-3


16/20


17/20


LPC - 1

1.9

2.0

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

3.0

B u l k

D e n s i t y (

g m / c m

o r M g / m

)

3

3

0 5 10 15 20 25 30 35 40

Apparent Limestone Porosity ( pu )

S a n d

s t o n e

L i m e s

t o n e

D o l o m

i t e

P o r o s

i t y

0

5

1 0

1 5

2 0

2 5

3 0

3 5

4 0

0

0

5

5

1 0

1 0

1 5

1 5

2 0

2 0

2 5

2 5

3 0

3 0

3 5

3 5

4 0

0 A n

h y d r i t e

45

40

35

30

25

20

15

10

5

0

-5

-10

-15

D e n s i t y

P o r o s i t y (

p u )

(

= 2

. 7 1 g m / c m ) 3

m a

Lithology-Porosity from Density-Neutron Crossplot

Applicability: MPD and MDN tools, environmentally corrected.Formation fluid density = 1.0 gm/cm ( Mg/m )3 3


18/20


LPC - 2

1.9

2.0

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

3.0

B u l k

D e n s i t y (

g m / c m

o r M g / m

)

3

3

0 5 10 15 20 25 30 35 40


D o l o m

i t e

P o r o s

i t y

0

5

1 0

1 5

2 0

2 5

3 0

3 5

4 0

0

0

5

5

1 0

1 0

1 5

1 5

2 0

2 0

2 5

2 5

3 0 3 0

3 5

3 5

4 0

0 A n

h y d r i

t e

45

40

35

30

25

20

15

10

5

0

-5

-10

-15

D e n s i t y

P o r o s i t y (

p u )

(

= 2

. 7 1 g m / c m ) 3

m a

Lithology-Porosity from Density-Neutron Crossplot

Applicability: MPD and MDN tools, environmentally corrected.Formation fluid density = 1.19 gm/cm ( Mg/m )3 3

S a n d

s t o n e

L i m e s t

o n e


19/20


LPC - 5

0 5 10 15 20 25 30 35 40


L i m e s t o

n e

D o l o m i t e

P o r o

s i t y

0

0

5

1 0

1 5

1 5

2 0

2 0

2 5

3 0

3 0

4 0

A n h y

d r i t e

40

50

60

70

80

90

100

110

S o n i c T r a n s i t

T i m e ( m i c r o s e c o n d s / f t )

3 5

140

160

180

200

220

240

260

280

300

360

340

320

S o n i c T r a n s i t

T i m e (

m i c r o s e c o n d s

/ m

)

0

5

1 0

1 5

2 0

2 5

3 5

4 0

1 0

3 0

S a n d

s t o n e

Time average

Raiga-Clemenceau

3 0

1 5

3 5

3 0

3 5

2 5

2 0

1 5

1 0

5

3 5

3 0

2 5

2 0

1 5

1 0

2 0

2 5

1 0

5

5

Formation fluid slowness = 189 microseconds/ ft ( 620 microseconds/m )

Lithology-Porosity from Sonic-Neutron Crossplot

Applicability: MDN tools, environmentally corrected.

2 5


20/20


Gen - 8

200

100

0

Rigid Tool Length (m)

Rigid Tool Length (ft)

B e n d R a d i u s ( m )

2 3 4 5 6 7 8 9 10 11 12

10 20 30 40

9

10

1112131415

20

304050

100200

A n g u l a r

B u i l d u p R a t e

( d e g r e e s / 3 0 m o r d e g r e e s / 1 0 0 f t ) 3 ins(76 mm)

4 ins(102 mm)

5 ins(127 mm)

6 ins(152 mm)

7 ins(178mm )

8 ins(203 mm)

Well Diameter

200

100

0

Rigid Tool Length (m)

Rigid Tool Length (ft)

B e n d R a d i u s ( m )

2 3 4 5 6 7 8 9 10 11 12

10 20 30 40

9

10

1112131415

20

304050

100200

A n g u l a r

B u i l d u p R a t e

( d e g r e e s / 3 0 m o r d e g r e e s / 1 0 0 f t )

5 ins(127 mm)

6 ins(152 mm)

7 ins(178 mm)

8 ins(203 mm)

9 ins(229 mm)

10 ins(254 mm)

Well Diameter

For a given tool diameter t, the maximum rigid tool length L that will traverse a well of diameterd andbendradius R isgiven by:

L = 2{(R+d) - (R+t) }

Angular build rate ( degrees / 30 m ) = 1718/R ( R in m )

2 2 1 /2

57 mm ( 2 in ) tools1/4

95 mm ( 3 in ) tools3/4

Maximum Tool Length in Deviated Wells

reeves oilfield service' company: compact chartbook

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