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Table of Contents

6

Drilling Jars

Page

6.1 USING DRILLING JARS ............................................................................................................ 6-1 6.1.1 Drilling Jars .................................................................................................................. 6-1 6.1.1.1 Jarring Objective................................................................................................. 6-2 6.1.1.2 Mechanical Jars ................................................................................................... 6-2 6.1.1.3 Hydraulic Jars...................................................................................................... 6-3 6.1.1.4 How does the Earthquaker (EQ) Drilling Jar Work ?......................................... 6-4 6.1.1.5 Features of the EQ Jar ......................................................................................... 6-8 6.1.2 Jarring/General ............................................................................................................. 6-8 6.1.2.1 Calculation of Tripping and Cocking Loads for the EQ Jar ............................... 6-9 6.1.3 Questions &Answers on the EQ Jar .......................................................................... 6-11 6.1.3.1 Earthquaker Drilling Jar Operation While Going In The Hole......................... 6-11 6.1.3.2 Earthquaker Drilling Jar Operation While Drilling .......................................... 6-12 6.1.3.3 Earthquaker Drilling Jar Operation When Stuck.............................................. 6-12 6.1.3.4 Earthquaker Drilling Jar Placement And Settings ............................................ 6-13 6.1.3.5 Earthquaker Drilling Jar Features ..................................................................... 6-14 6.1.3.6 Benefits of Earthquaker Drilling Jar over other Jars ........................................ 6-14 6.1.3.7 Earthquaker Drilling Jar Specifications............................................................ 6-15 6.1.3.8 Earthquaker Drilling Jar Operation In Horizontal Wells .................................. 6-16 6.1.3.9 Fishing With The Earthquaker .......................................................................... 6-16 6.1.4 Bumper Sub................................................................................................................ 6-17 6.1.5 Accelerator (Jar Booster) ............................................................................................ 6-17

List of Figures
Figure 6-1 Figure 6-2 Figure 6-3 Figure 6-4 Figure 6-5 Figure 6-6 Figure 6-7

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Basic jar schematic. ................................................................................................ 6-2 Anadrill HYDRAQUAKER hydraulicdrilling jar................................................. 6-4 EQ jar components. ................................................................................................ 6-5 EQ jar tripping mechanism..................................................................................... 6-6 EQ jar"positions"................................................................................................... 6-7 EQ jar - jarring “up” schematic. ............................................................................. 6-7 Typical fishing BHA incorporating jars. .............................................................. 6-18

List of Tables
Table 6-1 Table 6-2

Page

Seal areas, EQJars................................................................................................... 6-9 EQ Jar maximum settings ...................................................................................... 6-16

January 1997

Confidential

Directional Drilling 6-i

Drilling Jars

6

Drilling Jars
About this chapter

Until recently, the Earthquaker Drilling Jar and the Shock Guard were the only two DD tools which were provided directly by Anadrill for the...
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