HE Drilling Jars

Houston Engineers, Inc.
PREFACE
HYDRA-JAR®
Double Acting
Hydraulic Drilling Jar
6-80
Operation Manual
Effective Date, May 1998

Houston Engineers, Inc.
PREFACE
Drilling Jar Operation Manual
Houston Engineers, Inc. maintains sales agents and representatives in most major oil producing areas of the
world. The Houston office will furnish the name and address of our agent or representative in your area at
your request.
Domestic Sales and Service Locations
Louisiana
Houma.......................504-872-6833
Fax [phone]
E-mail [e-mail]
New Iberia.................318-364-8141
Fax [phone]
E-mail [email protected]
Oklahoma
Elk City......................405-243-3009
Fax [phone]
Texas
Alice ..........................512-668-9033
Fax [phone]
Houston .....................713-237-3065
Fax [phone]
Odessa .......................915-337-8353
Fax [phone]
Wyoming
Casper........................307-234-9944
Fax [phone]
INTERNATIONAL SALES
Texas, USA
Houston .....................713-237-3050
Fax [phone]
Email [email protected]
Singapore
Singapore...................65 545-5451
Fax [phone]
E-mail CompuServe 102134, 1002
United Arab Emirate
Dubai.........................971 4 835072
Fax [phone]
Email [e-mail]
Western Australia, Australia
Canning Vale.............08 9455 5311
Fax [phone]
E-mail [e-mail]
The designs and specifications of the tools described in this Operation Manual were current on the effective date of this manual.
Houston Engineers, Inc., whose policy is one of continuous improvement, reserves the right to discontinue models at any time, or to
change designs or specifications, without notice or without incurring obligation.

Houston Engineers, Inc.
TABLE OF CONTENTS
Drilling Jar Operation Manual
GENERAL DESCRIPTION 1
DESCRIPTION...............................................................................................................................1
CONTROL OF DRILLING JAR.............................................................................................1
ADVANTAGES OF USING DRILLING JAR ..............................................................................2
UNIVERSAL USE IN OIL AND GAS WELL OPERATIONS .............................................2
EASILY ADJUSTABLE WHILE IN USE..............................................................................2
LONG TERM CAPABILTY...................................................................................................2
HIGH STRENGTH CONSTRUCTION..................................................................................3
DIRECTIONAL DRILLING...................................................................................................3
FISHING OPERATIONS........................................................................................................3
DOUBLE-ACTING HYDRAULIC DRILLING JAR....................................................................4
OPERATION 5
GOING IN THE HOLE..................................................................................................................5
JAR SAFETY CLAMP............................................................................................................5
PICKING UP THE DRILLING JAR.......................................................................................5
OPERATION..................................................................................................................................8
JAR LOAD..............................................................................................................................8
Establishing the Jar Load..................................................................................................8
Example 1: Jar Load “Up”.........................................................................................8
Example 2: Jar Load “Down”....................................................................................8
Changing the Jar Load......................................................................................................8
JAR CYCLE............................................................................................................................8
Changing the Jar Cycle.....................................................................................................9
UP JARRING OPERATION...................................................................................................9
DOWN JARRING OPERATION............................................................................................9
UP AND DOWN JARRING OPERATIONS........................................................................10
SETTING THE DRILLING JAR PREMATURELY............................................................10
INCREASING EFFECTIVENESS........................................................................................10
Using the Mud Pump......................................................................................................10
Using Drill Collar Weights.............................................................................................10
Using the Accelerator® Tool...........................................................................................10
COMING OUT OF THE HOLE...................................................................................................11
CHANGE OUT GUIDE LINES...................................................................................................12
Table 1 Change Out Recommendations ..................................................................12

Houston Engineers, Inc.
TABLE OF CONTENTS
Drilling Jar Operation Manual
PLACEMENT 13
OPTIMUM DRILLING JAR POSITION.....................................................................................13
Drilling Jar In Tension ...........................................................................................................13
Placing Drilling Jar In Compression ......................................................................................13
Jar Tension Drilling Weight...................................................................................................14
Transition Zone......................................................................................................................14
WEIGHT CORRECTION TABLES.............................................................................................14
Table 2–BF–Mud Weight & Buoyancy Factor Multiplier .....................................................14
Table 3–AF–Hole Angle Factor Multiplier............................................................................14
NO ANGLE...................................................................................................................................15
CORE DRILLING.........................................................................................................................16
DIRECTIONAL DRILLING ........................................................................................................17
DIRECTIONAL DRILLING MOTOR.........................................................................................18
TABLES AND CHARTS 19
TABLES AND CHARTS..............................................................................................................19
Table 4 Drilling Jar Specifications.........................................................................................19
Table 5 Drilling Jar And Accelerator Weight Tables.............................................................20
Table 6 Amplification Factor.................................................................................................21
DRILLING JAR FISHING DIMENSIONS..................................................................................22
Table 7 Drilling Jar Fishing Dimensions................................................................................23
Table 7 (continued) Drilling Jar Fishing Dimensions ............................................................24
Table 7 (continued) Drilling Jar Fishing Dimensions ............................................................25
Table 7 (continued) Drilling Jar Fishing Dimensions ............................................................26
PUMP PRESSURE EXTENSION CHART..................................................................................27
DELAY TIMES vs LOAD Figure 19............................................................................................28

Houston Engineers, Inc.
GENERAL DESCRIPTION
Drilling Jar Operation Manual 1
Drilling Jar
General Description
The Hydra-Jar® is a double-acting hydraulic drilling jar capable of delivering an extra-heavy
impact, when a bottom hole assembly becomes stuck. Designed to operate as an integral part of a
drill string, it can withstand:
• Temperatures up to 500° F
• Hydrostatic pressures up to 20,000 psi
• Normal drilling conditions of torque, pump pressure, and long term use.
The Drilling Jar can easily be racked as part of a stand of drill collars because it is similar in length
and diameter, and has compatible connections and slip setting areas.
In the drilling mode, the jarring mechanism is disengaged and is not affected by normal drilling
conditions or torque.
CONTROL OF DRILLING JAR
By adjusting the amount of surface push or pull (no torque or external adjustments are required) the
operator can deliver very light or maximum impacts in either direction, while controlling the
number of impacts in any given time frame.
• If the drill string becomes stuck on bottom, the Drilling Jar can deliver impact in an ‘up-only’
direction.
• If the drill string becomes stuck off of the bottom, the Drilling Jar can deliver impact in a ‘down-
only’ direction.
• When differential sticking is encountered, and movement is needed to regain rotation and circulation,
the Drilling Jar will ‘up-jar’ and ‘down-jar’.