Formation Pressure Intro
Jan 05, 2016
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7/16/2019 Formation Pressure Intro
1/12
Well Design Spring 2013
Prepared by: Tan Nguyen
Well Design - PE 413
Chaper 1: !"r#ai"n Pressure
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7/16/2019 Formation Pressure Intro
2/12
Well Design Spring 2013
Prepared by: Tan Nguyen
1. Applied Drilling Engineering Adam T. Bourgoyne SPE
Textbook
2. Fundamental of Drilling Engineering i!ka and it"#ell SPE
Textbook $olume 12
%. Drilling Engineering &andbook $olume '' (obert it"#ell
). *la!! note!
+. Po,erPoint !lide!
$e%uired &aerials
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7/16/2019 Formation Pressure Intro
3/12
Well Design Spring 2013
Prepared by: Tan Nguyen
During a period of ero!ion and !edimentation- grain! of !ediment are "ontinuou!ly
building up on top of ea"# ot#er- generally in a ,ater filled enironment. A! t#e
t#i"kne!! of t#e layer of !ediment in"rea!e!- t#e grain! of t#e !ediment are pa"ked
"lo!er toget#er- and !ome of t#e ,ater i! expelled from t#e pore !pa"e!. &o,eer- if
t#e pore t#roat! t#roug# t#e !ediment are inter"onne"ting all t#e ,ay to !urfa"e t#e
pre!!ure of t#e fluid at any dept# in t#e !ediment ,ill be !ame a! t#at ,#i"# ,ould
be found in a !imple "olom of fluid. T#i! pre!!ure i! "alled /0(A P(ESS(E
and only dependent! on t#e den!ity of t#e fluid in t#e pore !pa"e and t#e dept# of
t#e pre!!ure mea!urement 3e4ual to t#e #eig#t of t#e "olom of li4uid5. it ,ill be
independent of t#e pore !i6e or pore t#roat geometry.
!"r#ai"n Pressure
De'inii"n N"r#al Pressure
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7/16/2019 Formation Pressure Intro
4/12
Well Design Spring 2013
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T#e erti"al pre!!ure at any point in t#e eart# i! kno,n a! t#e "(erburden
pressure "r ge"sai) pressure. T#e oerburden pre!!ure at any point i! a
fun"tion of t#e ma!! of ro"k and fluid aboe t#e point of intere!t. 'n order to
"al"ulate t#e oerburden pre!!ure at any point- t#e aerage den!ity of t#e material
3ro"k and fluid!5 aboe t#e point of intere!t mu!t be determined. T#e aerage
den!ity of t#e ro"k and fluid in t#e pore !pa"e i! kno,n a! t#e bulk den!ity of t#e
ro"k
*(erburden Pressure
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7/16/2019 Formation Pressure Intro
5/12
Well Design Spring 2013
Prepared by: Tan Nguyen
*(erburden Pressure
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7/16/2019 Formation Pressure Intro
6/12
Well Design Spring 2013
Prepared by: Tan Nguyen
!"r#ai"n Pressure
De'inii"n N"r#al Pressure
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7/16/2019 Formation Pressure Intro
7/12
Well Design Spring 2013
Prepared by: Tan Nguyen
T#e datum ,#i"# i! generally u!ed during drilling operation! i! t#e drillfloor
eleation but a more general datum leel- u!ed almo!t unier!ally- i! ean Sea
eel- S. 7#en t#e pore t#roat! t#roug# t#e !ediment are inter"onne"ting- t#e
pre!!ure of t#e fluid at any dept# in t#e !ediment ,ill be !ame a! t#at ,#i"# ,ould
be found in a !imple "olumn of fluid and t#erefore t#e pore pre!!ure gradient i! a
!traig#t line. T#e gradient of t#e line i! a repre!entation of t#e den!ity of t#e fluid.
&en"e t#e den!ity of t#e fluid in t#e pore !pa"e i! often expre!!ed in unit! of p!i8ft.
!"r#ai"n Pressure
De'inii"n N"r#al Pressure
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7/16/2019 Formation Pressure Intro
8/12
Well Design Spring 2013
Prepared by: Tan Nguyen
Pore pre!!ure! ,#i"# are found to lie aboe or belo, t#e 9normal: pore pre!!ure
gradient line are "alled abnormal pore pre!!ure!. T#e!e formation pre!!ure! may
be eit#er Subnormal 3i.e. le!! t#an ;.)
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7/16/2019 Formation Pressure Intro
9/12
Well Design Spring 2013
Prepared by: Tan Nguyen
!"r#ai"n Pressure
De'inii"n ,bn"r#al Pressure
+nderpressured
'"r#ai"n
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7/16/2019 Formation Pressure Intro
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Well Design Spring 2013
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,bn"r#al !"r#ai"n Pressure
C"#pa) E''e)
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7/16/2019 Formation Pressure Intro
11/12
Well Design Spring 2013
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,bn"r#al !"r#ai"n Pressure
fzob P+=
C"#pa) E''e)
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7/16/2019 Formation Pressure Intro
12/12
Well Design Spring 2013
Prepared by: Tan Nguyen
Dee)i"n "' !"r#ai"n Pressure
ased "n Drilled Cuings
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