135450 ⎘
Fishing for or freeing objects in boreholes or wells using impact means for releasing stuck parts, e.g. jars hydraulically-operated Jars with a hydraulic impedance mechanism, i.e. a restriction, for initially delaying escape of a restraining fluid
Impact Jar Delay, Activation Indicator, Shock Absorber, and Relatch Assist
#2Fishing jar
#3Systems and Methods for Downhole Service Tools
#4Release lugs for a jarring device
#5System and method for moving stuck objects in a well
#6Dislodging tools, systems and methods for use with a subterranean well
#7Fluid driven jarring device
#8Jarring apparatus
#9Jarring apparatus
#10Systems and methods for downhole service tools
#11Release lugs for a jarring device
#12Downhole impact apparatus
#13Hydraulic drilling jar with hydraulic lock piston
#14Dislodging tools, systems and methods for use with a subterranean well
#15Smart drilling jar
#16Reaction valve drilling jar system
#17Release lugs for a jarring device
#18Downhole apparatus for disconnecting portions of downhole tool string
#19Downhole impact apparatus
#20Downhole disconnect tool
#21PRESSURE ACTUATED JARRING DEVICE FOR USE IN A WELLBORE
#22Downhole impact apparatus
#23Reaction valve drilling jar system
#24Multimodal tool jar
#25Release lugs for a jarring device
#26Flow restricted impact jar
#27Hydraulic impact apparatus and methods
#28Hydraulic impact apparatus and methods
#29Pressure lock for jars
#30Hydraulic jar and a flow control device usable in the hydraulic jar
#31PUMP ACTUATED JAR FOR DOWNHOLE SAMPLING TOOLS
#32Wireline down jar
#33Subterranean vibrator with lateral vibration feature
#34Hydraulic jar with low reset force
#35Hydraulic/mechanical tight hole jar
#36Down hole tool with adjustable fluid viscosity
#37Hydraulic jar with multiple high pressure chambers
#38DOWNHOLE TOOL WITH EXTERNAL HOUSING TORQUE TRANSFER
#39Pressure lock for jars
#40Subterranean vibrator with lateral vibration feature
#41Jarring method and apparatus using fluid pressure to reset jar
#42Jarring method and apparatus using fluid pressure to reset jar
#43Hydraulic jar
#44Dual acting locking jar
#45Increased energy impact tool
#46Double-acting jar
#47Double-acting jar compounder
#48Double-acting jar
#49Drilling jar
#50Method for jarring with a downhole pulling tool
#51Method and means for providing time delay in downhole well operations
#52Down hole tool with adjustable fluid viscosity
#53Method and apparatus for decreasing drag force of trigger mechanism
#54Hydraulic jar and an overpressure relief mechanism therefor
#55Hydraulic timing device
#56Jar device
#57Methods and apparatus for placement of well equipment
#58Jar with adjustable preload
#59Multiple impact jar assembly and method
#60Connection apparatus and method
#61Downhole tool with pressure balancing
#62Hydraulic-mechanical jar tool
#63Hydraulic jar and trigger device
#64Hydraulic jar with low reset force