seminar kelly bushing

7/29/2019 seminar kelly bushing

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Kelly Bushing

University of TripoliDepartment of Petroleum Engineering


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CONTENTS

Introduction

How does Kelly Bushing work? Fixing (Engagement) of the kelly drive bushing

Types of Kelly bushing

Kelly bushing design

Maintenance


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Introduction

The Kelly bushing has inside

diameter profile that matches that

of the Kelly , usually square or

hexagonal

Kelly drive bushing is advise that

is fitted to the rotary table and

which the Kelly passes

Depth measurements are

commonly referenced to the KB,


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How does kelly bushing work?

The rotary motion from the rotary table is

transmitted to the bushing through the

pins, and then to the Kelly itself through

the square or hexagonal flat surfaces

between the Kelly and the Kelly bushing.The Kelly then turns the entire drill string

because it is screwed into the top of the

drill string itself.

When the Kelly is disconnected from the

string and set back, the drive bushing is lifted

and set back with it.


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Fixing (Engagement) of the kelly drive bushing

Drive Pin

The engagement is accomplished

either :

A) by drive pins fixed into the

bottom of the Kelly bushing fitting

into holes bored into the top of masterbushing


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Fixing (Engagement) of the Kelly drive bushing

B) By a square on the

bottom of the Kelly drive

bushing fitting into thecorresponding square recess

of the master bushing

The result of this engagement is

that when the rotary turns the

Kelly and the Kelly bushing turns

the entire drill string


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Types of Kelly bushing

Three types of Kelly bushing are available:Heavy, Medium, light-duty

Heavy duty Kelly Bushing

This unit is used for heavy duty drilling operations andhigh torque conditions on off shore as well as on shore

drilling operations.

Medium duty Kelly BushingDesigned for shallow to medium depth applications.

L ight duty Kelly bushing

designed for shallow, slim hole drilling and workover rig

applications


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ROLLER KELLY BUSHING

Model Type Drive style Master Bushing Square Kelly size Hex Kelly size

27 HDS Heavy Square 23 - 49 1/2 Inch 3 - 6 3 - 6

27 HDP Pin 23 - 491/2 Inch 3 - 6 3 - 6

20 HDP Pin20 - 22 1/2

inch3 - 6 3 - 6

RTM4 Medium Square 2 - 5 1/4 3 - 4 1/4

20 MDP Pin20 1/2 MSPC and

MDSP2 - 4 1/4 3 - 4 1/4

17 MDP Pin17 1/2 MSPC and

MDSP2 - 4 1/4 3 - 4 1/4

MDS Square17 - 27 1/2

inch2 - 4 1/4 3 - 4 1/4

4 KRVS Square 2 - 5 1/4 3 - 4 1/4

RTS4 Light Square 2 - 4 1/4 3 - 4 1/4

4 KRBM Square 2 - 4 1/4 3 - 4 1/4


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Kelly bushing design

The Kelly drive bushing is equipped with rollers that permit the

Kelly to move freely upward or down word either when the rotary

is turning or when it is stationary

The Kelly bushing may be designed to fit either shape of Kellys

(square hexagonal triangular ) or it may be designed to

accommodate either shape by changing rollers to fit

The Kelly bushing may have an optional lock assembly that locks

it into the master bushing , that is especially useful for use with

motion compensators offshore


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Rollers of Kelly drive bushing may be either:

single plane roller design

Double plane roller design


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Maintenance

1. Lubrication to reduce wear is the most important aspect ofmaintenance , it is done with a grease gun , it can be done

each tour or each day but must not be neglected

2. Keep top nut tight to keep roller pins from working in thebody journal area

3. The bushing regardless of its design type , must be

inspected regularly for wear

4. Parts can be removed and replaced right on the rig floor by

the floor crew under the supervision of the driller


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seminar kelly bushing