Calculaton And Dedifination

Basic Cementing Calculation PT. COSL INDO 2016. 10

Cement Plug TOC

Plug in casing

Plug in open hole

Plug in open hole & casi

Cement Plug TOC

Ite m 1

Unit Cap

2

Cap

3

Cap

4

Cap

5

Plug

6

Plug

(Drill Pipe ID)2/1029.4

bbl/ft

CSG

(Casing ID)2/1029.4

bbl/ft

OH

(Open Hole ID)2/1029.4 bbl/ft

TUB

(Tubing ID)2/1029.4

bbl/ft

(Drill Pipe OD)2/1029.4

bbl/ft

(Tubing OD)2/1029.4

bbl/ft

DP

DP TUB

Diameter unit: inch

Cement Plug TOC Plug Volume=(D1-D2) x Cap

CSG

TOC D2 Plug Volume TOC=D1Cap CSG – Plug DP + Cap D1 Plug in casing

DP

Cement Plug TOC Plug Volume=(D1-D2) x Cap

OH

x (1+EOC)

TOC D2

TOC=D1 Cap D1

Plug in open hole

OH

Plug Volume x (1+EOC)– Plug DP + Cap

DP

Cement Plug TOC

Plug Volume=(D1-D2) x Cap OH x (1+EOC) + (D2-D3) x Cap CSG TOC Plug Volume OH=(D1-D2) x (Cap OH x (1+EOC D3 - Plug DP + Cap DP) D2

Volume - Plug Volume(OH) TOC=D2 Plug Cap CSG- Plug DP + Cap DP D1

ug in open hole & casing

Cement Plug TOC Plug Volume=(D1-D2) x Cap

CSG

Plug Volume 1=(D1-DT) x (Cap TOC + Cap TUB)

CSG

– Plug

TUB

D2

DTubing 1

D1 Plug in casing

TOC=DT - Plug Volume – Plug Volume 1 Cap CSG – Plug DP + Cap DP

Cement Plug TOC Plug Volume=(D1-D2) x Cap

OH

x (1+EOC)

Plug Volume 1=(D1-DT) x (Cap OH X(1+EOC) TOC Plug TUB + Cap TUB) D2

DTubing 1

D1

Plug in open hole

TOC=DT - Plug Volume – Plug Volume 1 Cap OH x(1+EOC)– Plug DP + Cap

Cement Plug TOC Plug Volume=(D1-D2) x Cap OH x (1+EOC) + (D2-D3) x Cap CSG TOC

Plug Volume 1=(D1-DT) x (Cap OH X(1+EOC) D3 Plug TUB + Cap TUB) D2 2

Plug Volume 2=(DT-D2) x (Cap OH X(1+EOC)– Plug DP + Cap DP)

DTubing 1

D1

Plug Volume – Plug Volume (1+2 TOC=D2 Cap CSG – Plug DP + Cap DP

ug in open hole & casing

Flusher ahead & Flusher behind Flusher Volume Flusher Ahead Column= Cap CSG- Plug DP D2

D1 TOC

Flusher in casing

Flusher behind volume= Column x Cap

DP

Flusher ahead & Flusher behind Flusher Ahead Column= Flusher ahead volume Cap OH X (1+EOC)- Plug DP D1 Flusher behind = Column x Cap TOC

lusher in open hole

DP

Flusher ahead & Flusher behind Flusher Ahead Volume1= ( TOC - D1) x (Cap 2

OH

X (1+EOC)- Plug

D2 Flusher Ahead Volume2=Total volume - Volu D1

1

Flusher column 2= Volume 2 Cap CSG- Plug DP

TOC Flusher behind = Column (1+2) x Cap

sher in open hole and casing

DP

Flusher ahead & Flusher behind Flusher Ahead Volume1= ( TOC - DT) x (Cap D2 3 2 1

OH

X (1+EOC)- Plug

Flusher Ahead Volume2=

D1

(DT – D1) x (Cap

OH

X (1+EOC)- Plug

D

DTubing

TOC Flusher column 3= Volume- Volume(1+2) Cap CSG- Plug DP

Flusher behind = Column 1 x Cap TUB + Flusher in open hole Column(2+3) x Cap

DP

Casing Standoff

A=open hole diameter B= casing outside diamete

Pressure Calculation

psi=0.052 x ppg x ft

Psf Calculation

Velocity Calculation  

 

V=open hole velocity, m/s Rm=Mud pump rate, gpm Rc=Cementing rate, bpm Dd=Drilling collar diameter, in Dc=casing diameter, in Do=Open hole diameter, in

PY YP Mud, Flusher

PV=R600-R300, cps

YP=R300-PV, lbs/100ft2 Spacer

V=R600-R300, cps

P=(0.511*R600-1.022*PV)*2.0904, lbs/100ft2 Cement

PV=(R300-R100)*1.5, cps

YP=R300-PV, lbs/100ft2

PY YP

YP→ pump pressure of starting to pump slurry PV→ pump pressure gradient of increasing pump rate

BHST BHCT BHST=TVD x PsTG + AST…………………………….. (B.1)

BHST ── estimated bottom-hole static temperature, expressed in centigrade(℃).

AST ── assumed constant-temperature-layer temperature/sea bottom mud line temperature, expressed in centigrade(℃). PsTG ── geothermal gradient, expressed in centigrade per one hundred meter(℃/100 m). TVD ── actual vertical well depth below constant-temperature-layer /vertical depth below the mud line, expressed in meters(m).

BHST BHCT

T=Ki x BHSTi……………………………………….. (B.2) Ki──conversion factor between wireline logging bottom-hole temperature after i hours static and 24 h bottom-hole static temperature (see Table B.1); BHSTi──bottom-hole static temperature measured after i hours static, expressed in centigrade (℃). after i hours static

Ki

0-11

1.15

12-14

1.13

15-21

1,08

21-23

1.03

24

1.00

BHST BHCT

PsTG=(BHST-AST)/TVD………………………………….. (B.3 )

PsTG ── geothermal gradient, expressed in centigrade per one hundred meter (℃/100 m).

BHCT=F x BHST………………………………………….. (B.4)

BHCT ──bottom-hole circulation temperature, expressed in centigrade (℃). F ──empirical factor of local area,0.70 ～ 0.85, the deeper the well is and the smaller the annular space outside the pipe is, the larger the factor is.

BHST BHCT Question:

Current drilling BHCT -- √

Current TVD -- √

AST -- √

TD BHCT -- ???