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CASING DRILLING / JET & DRILL BHAs

Drill with Casing (DwC)

Casing While Drilling (CwD)

Conductor Casing Jetting and Drill-Ahead

By: Saw Aung

Drilling Applications Engineer 10/15/2014

© 2010 Baker Hughes Incorporated. All Rights Reserved. 1

Advantages of Casing Drilling

The use of casing for drilling is an emerging technology and the advantage as follows;

1. Reduce well-construction costs

- Minimize the number of pipe trip

2. Improve operational efficiency and safety

- Prevent Loss Circulation

- Prevent Stuck Pipe

3. Minimize environmental impact

- Low Flow rate with High Annular Velocity

- Less High-vis Pill


Casing Drilling Applications

•Drill with Casing (DwC) – Surface Wellhead System

– Vertical Hole

– No Need BHA

– Need Surface Casing Drilling Equipment

• Casing While Drilling (CwD) – Need Conductor Casing Before Run

– Surface Wellhead System

– Platform Development Drilling

– Directional Drilling

– Need Motor BHA

– Need Surface Casing Drilling Equipment

• Conductor Jetting and Drill Ahead – Subsea Wellhead System (Deep water drilling)

– Can Drill-ahead next section

– Need Motor BHA


Drill with Casing (DwC)

•DwC™ System Diagram


• DwC drive system attached to top

drive

– Pup joint

– Kelly valves

– Pump in sub (optional)

• Drive system internal catch into

casing with 1/4 turn to right

• Standard float collar in place as

required for cement job

• Rigid centralizers positioned as

per cementing requirements

• Drillable DrillShoe™ Tool

EZ Case 9-5/8

9-5/8 Float

Collar

9-5/8 Casing

DwC BHA @ Well-1 (Myanmar)


EZCase Casing Bit

ROP ~56m/hr. Parameters : 350-800 gpm, 800-1000 psi, 40-60 rpm, 3-4 kft-lbs and WOB 4-5 Klbs.

CwD BHA @ Well-2 (Myanmar)


13-3/8” CwD Drilling Parameters on Well-2 (Myanmar)


Plan & Actual well trajectory comparison


Cross-Section View Plan View

Inc. 15°

26”x 36” Casing Jetting & Drill Ahead BHA


The 36” Cam-Actuated Drill Ahead Tool (CADA) Tool


Drilling Ahead with the CADA Tool


36” Casing

36” Wellhead Housing

26” Drill-Ahead BHA

J-LUGS

Deepwater Conductor Jet In Procedure


1) Make up 36in conductor and hang below rig floor 2) Make up Bit-Motor-MWD-DC-Drill Ahead Tool 3) Run inside the conductor and latch DAT to conductor 4) “Dive” ROV to check space out 5) Tag seabed 6) Space out drill pipes – L/D 1 single if required 7) Free Fall until approx 5-10k weight is S/O 8) Check inclination ( Bulls-eyes ) 9) Start with Low Flow to prevent broaching/channeling 10) Check for broaching/channeling and increase flow 200~1200gpm 11) Hi-Vis Sweeps and work pipe up down to break friction (KEEP PIPE MOVING!!)

75-98m

Sea Level

75-

98

m

Sea Bed

Bull-eyes

ROV

Broaching/channeling

Baker Hughes S.E.A Deepwater Experience

13

Total Number of Well (2006 –March 2014)

Total Wells = 104 Deepwater Wells

Total Jetting = Over 40 cases

Water Depth range from 500m to 2,500m Total meterage: 182,691m % KPI = 1 - ( NPT / BRT )

= 1 - 0.0108 = 98.9%

Jetting Case Histories

• Summary of Jetting Cases in Malaysia ( Over 40 cases )

14

Average ROP ( m/hr ) 5.5 – 42

Bit Stick Out ( Inches ) -2 – 9

Conductor Length ( m ) 72 – 92

Time Taken ( hrs ) 2.2 – 14

Factors Affecting Time to jet

• Rig

– Hoisting Ability

– Pumps ( flow up to 1200gpm )

• BHA Design

– Drill Pipe size

– Bit Size / Conductor Size

– Bit Stick Out ( Recommended 4-8 inches )

• Crew Experience

– All except 1 client, jetting is supervised by DD

• Formation / Field

15

Generally not an issue with DW rigs

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