Patent application number | Description | Published |
20100319930 | Time-Controlled Release Device for Wireline Conveyed Tools - This invention relates to a time controlled release device for down line tools in oil or gas wells. Tools that are lowered into a well for various purposes occasionally become stuck in the well and are not able to be withdrawn using jars and other dislodging techniques. In such a situation it is desirable to provide a controlled release device that will disengage the tool from the line only after a given time period. This allows the operator to continue to exert upward force on the line for a given time period prior to the release device being actuated. | 12-23-2010 |
20110049777 | Belleville Spring Guide System - Apparatus and method are provided for decreasing frictional effects in stacks of Belleville springs and limiting deflection of the springs. In one embodiment, carriers for springs overlap and minimize the effects of lateral forces that are developed as springs in a stack are loaded. Carriers may be used on mandrel guides, in cylindrical guides or without a guide. In other embodiments, maximum load and defection of springs may be provided by the spring carriers. | 03-03-2011 |
20110083851 | Compact Jar for Dislodging Tools in an Oil or Gas Well - This invention relates to a jar used to dislodge tools stuck in a well. The jar includes two housing portions movable with respect to each other. A release collet forms a portion of one of the housings. A release sleeve is carried by a mandrel and is located within the release collet. After a given amount of movement of the housing with respect to the mandrel, the release mechanism is activated and the two housing sections rapidly move with respect to each other. A hammer portion of the mandrel then strikes an anvil in the anvil housing, thus applying an upward force to the tool lodged in the well. | 04-14-2011 |
20110220345 | Dual Acting Locking Jar - A double action locking jar is operable to provide a jarring force in an upward or downward direction. A pair of pressure pistons form a pressure chamber in which a Belleville spring stack is located. A metering orifice in one of the pistons serves to provide a delay mechanism for release of a mandrel within the housing. Two collets are located within the housing for mechanically releasing the mandrel when a tension or compression force is applied to the mandrel. The jar may be mechanically actuated only by allowing the pistons to freely move within the housing without hydraulic resistance. | 09-15-2011 |
20120298365 | Compact Jar for Dislodging Tools in an Oil or Gas Well - This invention relates to a jar used to dislodge tools stuck in a well. The jar includes two housing portions movable with respect to each other. A release collet forms a portion of one of the housings. A release sleeve is carried by a mandrel and is located within the release collet. After a given amount of movement of the housing with respect to the mandrel, the release mechanism is activated and the two housing sections rapidly move with respect to each other. A hammer portion of the mandrel then strikes an anvil in the anvil housing, thus applying an upward force to the tool lodged in the well. | 11-29-2012 |
20130168092 | Double-Acting Shock Damper for a Downhole Assembly - A downhole assembly, including a downhole tool, a downhole force-creating device, and a shock damper. The shock damper includes a hollow housing including an annular shoulder near each end and extending radially inward from the housing. The damper also includes a mandrel located at least partially inside the housing to form an annulus between the mandrel and the housing, the mandrel including an annular shoulder near each end and extending radially outward from the mandrel. A spring is located in an annular cavity formed by the annulus and between both the housing shoulders and the mandrel shoulders. The mandrel is movable relative to the housing to an expanded position in one direction and to a compressed position in the other direction. | 07-04-2013 |
20130277057 | Hydraulic/Mechanical Tight Hole Jar - A jar comprises a housing including an anvil. In addition, the jar comprises a mandrel telescopically disposed within the housing and including a hammer. Further, the jar comprises an annular chamber radially positioned between the mandrel and the housing. Still further, the jar comprises an actuation assembly disposed in the annular chamber. The actuation assembly includes a first collet disposed about the mandrel, a first trigger sleeve disposed about the first collet and adapted to releasably engage the first collet, and a first biasing member adapted to exert an axial force on the mandrel. Moreover, the jar comprises a lock assembly disposed in the annular chamber. The lock assembly includes a second collet disposed about the mandrel, a second trigger sleeve disposed about the second collet and adapted to releasably engage the second collet, and a second biasing member adapted to exert an axial force on the mandrel. | 10-24-2013 |
20140251691 | Method and Apparatus for Improving the Efficiency of a Positive Displacement Motor for Drilling and Oil or Gas Well - A method and apparatus for improving the efficiency of a drill string that includes drilling pipe, a dump valve, a positive displacement motor and a rotary drill bit driven by the motor utilize a dump valve that does not depend upon a pressure loss to maintain the dump valve in a position which closes communication between the drilling string and the annulus between the drilling string and the well bore or casing. The dump valve includes a flow sleeve that is axially moved to close outlet passages to the annulus by the flow of fluid through the outlet passages rather than a pressure drop across the flow sleeve. | 09-11-2014 |