Rotary System Rotary table:

Bushing: Kelly bushing Kelly: Swivel

Top drive: Top drive: Advantage : trip in/out faster

Down hole motor: Positive displacement (PDM) Turbine

Operating w/drilling fluid Bit is rotating only (oriented mode)

ROTARY SYSTEM

Swivel

The rotary system includes all of the equipment to achieve bit rotation

Swivel Kelly Rotary Drive Rotary Table Drill Pipes Drill Collars

Supports the weight of the drillstring and permits rotation.

The bail of the swivel is attachedto the travelling block

The gooseneck of the swivel

SWIVEL

The gooseneck of the swivelprovides a down-ward pointingconnection for the rotary hose.

Are rated according to loadcapacity

KELLY The first section of pipe below

the swivel.

Square or hexagonal Square or hexagonal

Must be kept straight.

KELLY SAVER SUB

Used between the Kelly and the first joint of drill pipe.

In expensive short section.

Prevents wear on the Kelly threads.

The opening of Rotary Table that accepts the KELLY BUSHING must be large enough for passage of the large bit to be run in the hole.

ROTARY TABLE

to be run in the hole.

The lower portion of the opening is contoured to accept SLIPS that grip the drill string, and prevent it from falling into the hole while a new joint of pipe is being added to the drill string. SLIP

A lock on the rotary table prevents it from turning when pipe is unscrewed without the use of backup tongs

A hydraulic transmission between the rotary table and the rotary drive often is used.

It reduces shock loadings and prevent excessive It reduces shock loadings and prevent excessive torque, if the pipes becomes stuck

Power swivels or power subs or Top Drive installed just below a conventional swivel can be used to replace the Kelly, Kellybushing, and rotary table.

Drill string rotation is achieved through a hydraulic motor incorporated in the power sub.

The major portion of the drill string is composed of DP

The DP in common use is hot-rolled, pierced, seamless tubing.

DRILL PIPES

pierced, seamless tubing.

API has developed specifications for DP

DP is specified by its outer diameter, inside diameter, weight per foot, steel grade, and range length

Example: 4 in x 3.66 in, 16.6 ppf, E, Range-1

Represents:

Outside Diameter: 4 inchInside Diameter: 3.66 inchInside Diameter: 3.66 inchWeight of DP per unit Length: 16.6 pounds per footGrade: EAverage length with in Range - 1

Drill Pipe Is Furnished In The Following API Length Ranges

Range Average length, ft 1 18 ft - 22 ft 2 27 ft - 30 ft 3 38 ft - 45 ft

Range-2 DP is used most commonly

DP joints are attached by means of tooljoints.

The female portion of the tool joint iscalled the BOX and the male portion iscalled the PIN.

PIN

TOOL JOINTS

The portion of the DP to which the tooljoint is attached has thicker walls

This thicker portion of the pipe is calledthe upset.

BOX

INTERNAL UPSET

EXTERNAL UPSET

INTERNAL-EXTERNAL UPSET

A tungsten carbide hard facing sometimes is manufactured on the outer surface

A round-type thread is used now on the drill pipe.

The V type thread was used in early drill pipe designs, but thread failure was frequent because of the stress concentrations in the thread root.

The lower section of the drill string

thick walled heavy steel tubulars used to apply weight to the bit by keeping DPs in tension.

DRILL COLLARS

weight to the bit by keeping DPs in tension.

The buckling tendency of DP is too great to use itfor applying weight on bit.

The smaller clearance between the borehole and the DCs helps to keep the hole straight.

Keeps the DCs centralised.

STABILISERS

The term capacity often used

Volume (bbl) per unit length (ft)

5.029,1)IDOD( 2DP2DP

Where

OD = inchID = inchH = inch

CAPACITY (BBL/FT)

Volume of steel, bbl per ft of DP

5.029,1ODH 2DP

2

5.029,1ID 2DP

H = inch

These equations do not consider the effects of tool joints and couplings. Use manufacturers manuals to consider them

Annular volume, bbl per ft of DP

Inner volume, bbl per ft of DP

DP DESIGN? ? ?1

1

1

2

2

3 ?

2

3

4

3,700 ft DP

200 ft DP (S)

(G)

1

2

600 ft DC

3,000 ft DP (E)

MOP = MAL - HLHL

MAL Grade

YS, psi

D 55,000E 75,000E 75,000G 105,000S 135,000We

arPremium & Class 2

20%

Class 3 37 % [ ]

+=

steelDPDPDCDC

MW1LWLWHL( )

pi=

100Wear1IDOD

4YSMAL 2DP

2DP

DESIGN RULES

Weakest DPs should be attached next Weakest DPs should be attached next to DCs

If MOP falls below critical MOP, upgrade to the next stronger grade