A flow back plug, a bridge plug, a ball drop plug and plug with a disintegratable check therein are made from a common subassembly including, in some embodiments, a mandrel, a slips/seal section, a setting assembly and a mule shoe. In other embodiments, the common components are a mandrel, a slips/s
A flow back plug, a bridge plug, a ball drop plug and plug with a disintegratable check therein are made from a common subassembly including, in some embodiments, a mandrel, a slips/seal section, a setting assembly and a mule shoe. In other embodiments, the common components are a mandrel, a slips/seal section and a mule shoe. To make the flow back plug, a ball check is placed in the mule shoe. To make the bridge plug, an obstruction is inserted in the mule shoe. To make the ball drop plug, the mule shoe is left unobstructed so any ball dropped in a well seats in a tapered inlet to the mandrel. To make a plug with a disintegratable check, a ball dropped in the well is of a type that disintegrated in frac liquids. The setting assembly includes a setting rod connected to a setting device in the mandrel passage. When the plug is expanded into sealing engagement with a production string, the setting rod pulls out of the setting device leaving a passage through the mandrel and through the setting device. Another embodiment is an improved adapter sleeve used on conventional setting tools.
대표청구항▼
1. A down hole well tool comprising a mandrel having a first passage therethrough;a slips/seal section movable on an exterior of the mandrel from a running in position to an expanded position for sealing against a production string; anda setting assembly for assisting in moving the slips/seal sectio
1. A down hole well tool comprising a mandrel having a first passage therethrough;a slips/seal section movable on an exterior of the mandrel from a running in position to an expanded position for sealing against a production string; anda setting assembly for assisting in moving the slips/seal section from the running in position to the expanded position, the setting assembly including a setting device at least partially disposed within the mandrel and having a second passage therethrough comprising a threaded section, anda setting rod comprising a threaded section engaged with the threaded section of the setting device, wherein pulling on the setting rod expands the slips/seal section into sealing engagement with the production string and separates the threaded section of the setting rod from the threaded section of the setting device to remove the setting rod from the mandrel, the arrangement of the setting device and setting rod being that removal of the setting rod from the mandrel opens the first and second passages, the setting device remaining rigid with the mandrel upon removal of the setting rod. 2. The down hole tool of claim 1 wherein the first passage provides a tapered inlet so a ball can be inserted into the production string to seal against the tapered inlet to prevent downward flow into the production string. 3. The down hole tool of claim 2 further comprising a ball seated against the tapered inlet preventing downward flow into the production string. 4. The down hole tool of claim 1 wherein the first passage extends completely through the mandrel and slips/seal section. 5. The down hole tool of claim 1 comprising a first end and a second end, the down hole tool being adapted to receive the setting rod through the first end and wherein the unthreaded section is between the second end and the threaded section. 6. The down hole tool of claim 1 wherein the setting device is connected to the mandrel. 7. A down hole well plug comprising a mandrel having a first passage therethrough; a slips/seal section movable on an exterior of the mandrel from a reduced diameter running in position to an expanded position for sealing against a production string; a setting assembly including a setting device rigid with the mandrel in the first passage, the setting device providing a second axial passage therethrough communicating with the first axial passage and a setting tool connected to the setting device so that tensioning the setting tool expands the plug into sealing engagement with a production string and removes the setting tool from the first and second passage, the setting device remaining rigid with the mandrel upon removal of the setting tool; and a mule shoe connected to the mandrel and having a passage therethrough communicating with the mandrel passage, the passage including a passage section, circular in cross-section perpendicular to an axis through the plug, having a first end adjacent the mandrel and a second end, and a valve seat adjacent the second end of the passage section;the setting device providing an obstruction overlying the passage section and preventing an object in the passage section from moving toward the mandrel and providing a bypass allowing fluid flow toward the mandrel in the event there is a ball check in the passage section. 8. The down hole plug of claim 7 wherein the passage section is cylindrical. 9. A plug for isolating a wellbore, comprising a mandrel having a first end and a second end and a passage formed therethrough;at least one sealing element disposed about the mandrel;at least one slip disposed about the mandrel;at least one conical member disposed about the mandrel; andan insert at least partially disposed within the bore of the mandrel proximate the second end of the mandrel, wherein:the insert is adapted to receive a setting tool that enters the mandrel through the first end thereof;the insert comprises one or more shearable threads disposed on an inner surface thereof;the one or more shearable threads are adapted to engage the setting tool;the one or more shearable threads are adapted to release the setting tool when exposed to a predetermined axial force;the insert comprises a passage therethrough, the passage through the insert including the one or more shearable threads;the insert comprises a shoulder disposed on an outer surface thereof, the shoulder adapted to abut the second end of the mandrel; andthe insert and the mandrel being unshearable when exposed to the predetermined axial force. 10. The plug of claim 9 wherein the outer surface of the insert has a larger diameter and a smaller diameter forming the shoulder therebetween. 11. The plug of claim 9 wherein the mandrel is adapted to receive a ball that restricts flow in at least one direction through the mandrel. 12. The plug of claim 9 wherein the predetermined axial force to release the setting tool is less than an axial force required to break the mandrel. 13. The plug of claim 9 further comprising an anti-rotation feature disposed proximate a first end, a second end, or both ends of the plug. 14. The plug of claim 13 wherein the anti-rotation feature is selected from the group consisting of a taper, a mule shoe, a half mule shoe and one or more angled surfaces. 15. The plug of claim 9 wherein the plug is a frac plug. 16. The plug of claim 9 wherein the insert passage has substantially the same diameter as the mandrel passage. 17. The plug of claim 9 wherein the insert is brass. 18. The plug of claim 9 wherein the insert is threadably engaged to the mandrel through a threaded connection. 19. The plug of claim 9 further comprising an impediment to block fluid flow in both axial directions through the mandrel. 20. The plug of claim 9 wherein the plug is a bridge plug. 21. The plug of claim 9 wherein at least one of the mandrel passage and the insert passage is adapted to receive an impediment therein restricting flow in at least one direction through the mandrel.
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