Schlumberger PublicRotaryRotary(B)ottom (B)ottom (H)ole (H)ole
(A)ssembly(A)[email protected]
PublicObjectivesDescribe the minimum number of BHA changes needed
in:a slant directional well an ! t"#e directional wellDescribe what
is meant b":bit side forcefulcrum e$ect#endulum e$ect%lain the
e$ect of drill collar sti$ness in BHA
[email protected]'Schlumberger PublicObjectives (2%lain wh"
minimi)ing the number of D*+s and stabili)ers is advisable in
directional BHA+sDescribe the e$ect of an under gauge near,bit
stabili)er in: dro#,o$ BHA+sbuild,u# BHA+show wh" an under gauge
second is used in a loc-ed BHA for tangent sectionDescribe the
e$ect of hole washout on BHA [email protected]
PublicObjectives ('Describe the e$ect of drilling #arameters have
on inclination / direction with each t"#e of BHA%lain wh" fre0uent
surve"s is advisable when an 12D tool is available3ive e&am#les
of t"#ical BHA designed to build and dro# inclination at various
[email protected] PublicDrilling- Deflection
DevicesTools & Techniques to deflect the course of the well in
a controlled manner, (overcoming natural tendencies) eg.,
to:ic!-off, nudge ("uild angle from vertical to a desired
direction)Tra#ector$ correction (turn, "uild, dro% to the desired
tra#ector$)&idetrac! (deflect the well from it's original
course)[email protected] Public(etting) *sed in soft
formations) +ne large "it no,,le oriented to the desired direction)
-ear .it &ta"ili,er and lim"er assem"l$) /ash a %oc!et in the
formation) &%ud and rotate, wash, until angle is "uilt)
0ontinue "uilding with rotar$ .12) 2,imuth corrections more
difficult with 3 [email protected] Public+%en
1ole /hi%-stoc!ing) *sed in medium to hard formations) .it, -.
&ta". %inned to whi% and conve$ed to "ottom) Tool 4ace
oriented) /hi% is wedged on "ottom and %in sheared) *ndersi,ed
%ilot hole is drilled) +nl$ one #oint drilled "efore 5++1 the .12)
5ilot hole o%ened u% and %rocess re%[email protected]
Public6789's - D$nadrill) 4irst commercial 5D:) 1$draulic %ower to
:ech. %ower driving the .it) &tring !e%t stationar$ - onl$
sliding) .ent su" a"ove motor %rovides side force to the "it)
Deflects the hole tra#ector$ - !ic!-off from vertical, sidetrac!,
correction run, etc.) ;er$ efficient when com%ared to contem%orar$
deflection devices, (#etting, whi%-stoc!s
..)[email protected] Public+ther :otor Designs) Tur"ines,
Tur"odrills) *sed for im%roving drilling 9's - &teera"le
:otors) .end closer to the "it reduces "it offset for equivalent
curvature. -? "it offset @ ? com%onent stress- K , 689 l"sAft) this
.12 will requireM") Ef the num"er of D0's is limited to 8, how man$
1/D5 should "e added to the stringM (1/@ I, F7.N
l"sAft)[email protected] PublicBuc-lingr W K I EFBCR sin2
=(in) hole and joint tool pipe between clearance Radial r(lbs/in)
air in weight Unit W) (inch inertia of MomentI(unitless) factor
Buoyance Modulus s!oung" #(deg) interest of point the at hole the
of n Inclinatio (lbs) load buc$ling sinusoidal %ritical
&'B%[email protected] Public&ta"ili,ation)
&ta"ili,ed .12 can "e designed to "uild, hold or dro%
inclination ) 0ritical elements: )&ta"ili,er
gauge)&ta"ili,er %osition)Drill collar +DAweightAmoment of
inertia)1ole inclination)/+.,
