a directional drilling bha presentation sonatrach

7/28/2019 A Directional Drilling BHA Presentation Sonatrach

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Directional Drilling


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Fs


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Sliding


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Bit Displacement

Lateral distance from the BHA

the bit center

BD = Lt x sin

where : Lt (in) length from b

() bend angle

_________________________

Example :

9 5/8 Sperry-Drill, 6/

Lm = 32.14 ft

Lt = 32.14 + 1.0 = 33 = 1.5

BD = 397.68 x sin 1.5

BD

Lt

Bent sub


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Bit Interference - examp

Bi = BD + 0.5(DM +DB)-DH= 10.41 + 0.5(9.625 + 1= 9.098 in

BD

= 10.41 (in) bit displacem

Dm = 9.625 (in) OD of the mo

Db = 12.25 (in) bit size

Dh = 12.25 (in) hole size

Dm

Db

Dh

Bi

BD

Bent sub


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Bit Displacement

Lateral distance from the moto

the bit center

BD = Lt x sin

where : Lt (in) length from b

() bend angle

__________________________

Example :

9 5/8 Sperry-Drill, 6/7

Lt

= 129.4

= 1.5

BD = 129.4 x sin 1.5 = 3BD

LtABH


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Dm

Db

Dh

Bi

Distance the bit would displace b

of the wellbore if not constrained

Bit Interference

Bi = BD + 0.5(DM +DB)-DH

where : BD (in) bit displacem

DM (in) OD of the mo

DB (in) bit size

DH (in) hole size


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Dm

Db

Dh

Bi

Bit Interference - example

Bi = BD + 0.5(DM +DB)-DH= 3.39 + 0.5(9.625 + 12.25) -

= 2.077 in

BD = 3.39 (in) bit displaceDM = 9.625 (in) OD of the m

DB = 12.25 (in) bit size

DH = 12.25 (in) hole size


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Kick-off / SidetraKick-off / Sidetrac

Interference created side forces p

bit to the side and cause sidetrac


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Sidetracking from Cem

Time drilling : 4-5 in/hr progres

low WOB

monitor cement

CMT Plug

50% ce

50% for

100% ce

100% side force


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Effect of Bent Housing AngEffect of Bent Housing Angon Build Rates and Bit Side-lon Build Rates and Bit Side-l

Straight Hole

Ho

BendAngle

()

0.5

0.75

1

1.251.5

35 ft

0

2000

4000

6000

8000

10,000

12,000

14,000

16,000

18,000

20,000

0.5 0.75 1 1.25 1.5Bent Housing Angle, deg

Bit Side-Load

Bit Side-LoadRotating inCurved Hole

BitSide-Loa

d,

lb


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Theoretical DLS

DLS ====

R

Bend angle

Bit

Top stabilizer

Motor stabilizerCurved borehole

L2

L1

T

Based on the assumption that the stabilizers are full gauge, and

motor stabilizer

Note : also called three point geometry


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Performance ExpectationPerformance Expectation

Bent Sub

bent sub angles - 0.5 to 3.00

dogleg expectancy - 1.00 to 6.00

Bent Housing

bent housing angle - 0.75 to 1.75

dogleg expectancy - 1.00 to 35.00


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Oriented Build Rate Associated with 12-1/4 Hole Size, 8 Motor Adjustable Be

No Motor Top Stabilizer at Various Inclinations Based on Various Bent Housin

Application (1)Application (1)


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Oriented Build Rate Associated with 12-1/4 Hole Size, 8 Motor Adjustable Be

Motor Top Stabilizer at Various Inclinations Based on Various Bent Housing Se

Application (2)Application (2)


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What was the build raWhat was the build ra

that motor!that motor!


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StabilizersStabilizers


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Integral Blade StabilizersIntegral Blade Stabilizers


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TCI Inserts on Stabilizer BlaTCI Inserts on Stabilizer Bla


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No Hard facing on Fishing NNo Hard facing on Fishing N


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Damaged Stabilizer BladDamaged Stabilizer Blad


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Sleeve Stabilizer for a MoSleeve Stabilizer for a Mot


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Adjustable Gauge StabilizAdjustable Gauge Stabiliz

Hole Sizes : 5-7/8 - 17-1/2

Gauge Change : 0.5 - 1.06

2- and 3- position tool

Operates on 400 psi

Cycles every time pump cycled

Pistons locked into body

Position indication by SPP shift

Normal drilling position: buttons

retracted


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Adjustable Gauge StabilizAdjustable Gauge Stabiliz

STATUS SIGNAL - SPP

PUMPS OFF

PUMPS ON PUMPS ON PUMPS ON

PUMPS OFF

EXTENDEDRETRACTEDRETRACTED


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Adjustable StabilizerAdjustable Stabilizer


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AGS Used With PDMAGS Used With PDM

mud motor

mud motor


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What is This?What is This?


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DBS Cuttings Bed Impeller DBS Cuttings Bed Impeller


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a directional drilling bha presentation sonatrach

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