JAR PLACEMENT BEST PRACTICES

SECTION BEST PRACTICE
JAR LIFE & EFFECTIVENESS:
 DO NOT PLACE THE JAR NEAR THE NEUTRAL POINT (STAY (+/-) 20% AWAY FROM THE NEUTRAL POINT).
 DO NOT PLACE THE JAR WITHIN 90 FT OF A STABILIZER, ROLLER REAMER OR SIMILAR TOOL.
 DO NOT PLACE THE JAR WITHIN 60 FT OF THE DRILL PIPE IN THE DRILL STRING.
 DO NOT PLACE THE JAR WITHIN 90 FT OF A SHOCKTOOL AND ALWAYS ABOVE THE SHOCK TOOL.
 DO NOT PLACE THE JAR WITHIN 90 FT OF THE DRILL BIT.
 DO NOT USE THE JAR AS CROSSOVER OR PLACE AT A TRANSITION POINT (BETWEEN TOOLS/PIPE OF DIFFERENT DIAMETER).
 THE DIAMETER OF HEAVY WEIGHT OR DRILL COLLARS ABOVE AND BELOW JAR SHOULD NEVER BE LARGER THAN THE O.D. OF THE JAR.
 JAR REQUIRES A MINIMUM OF 2 ITEMS OF DRILL PIPE, COLLAR OR HEAVY WEIGHT BOTH ABOVE AND BELOW JAR.
MAXIMIZE JAR EFFICIENCY:
 IT IS RECOMMENDED TO PLACE TWO JOINTS OF DRILL COLLARS (OR HEAVY WEIGHT) ABOVE AND BELOW THE JAR TO INCREASE MASS NEAR JAR.
 IT IS RECOMMENDED TO PLACE JAR LOWER IN BHA, IF MECHANICAL STICKING (STUCK AT BIT) IS EXPECTED (TO INCREASE JARRING EFFICIENCY AT STUCK POINT).
 IT IS RECOMMENDED TO PLACE JAR HIGHER IN BHA, IF DIFFERENTIAL STICKING IS EXPECTED (TO REDUCE CHANCE OF STICKING ABOVE JAR).
PLACEMENT OF JAR:
 JAR MAY BE PLACED IN TENSION OR COMPRESSION.
 IT IS RECOMMENDED TO RUN A MECHANICAL JAR IN COMPRESSION IF POSSIBLE (REDUCES MISFIRE DUE TO WT. BELOW JAR).
 IT IS RECOMMENDED TO RUN A HYDRO JAR IN TENSION IF POSSIBLE, TO REDUCE CHANCE OF MISFIRE DUE TO INADVERDENT OPERATOR ERROR.
 DO NOT PLACE THE JAR IN, OR NEAR, DRILL PIPE.