Release tool for coiled tubing

A release tool to attach coiled tubing to a bottom hole assembly in a well bore, comprising:

• a fishing neck housing functionally associated with the bottom hole assembly;
• a release tool mandrel attached to the coiled tubing and adapted to move axially wit respect to the fishing neck housing upon the application of an upward force on the coiled tubing;
• and
• a reset mechanism, the reset mechanism functionally associating the fishing neck housing and the release tool mandrel such that a predetermined combination of a first upward force may be applied for a corresponding first amount of time to the release tool mandrel without releasing the bottom hole assembly, and such that the after the application of the predetermined combination of the first upward force for the first amount of time, the application of a second upward force will release the bottom bole assembly from the coiled tubing, the reset mechanism having a first chamber, a second chamber, and a biasing means adapted to apply a biasing force, wherein a pressure fluid is adapted to flow from the second chamber to the first chamber after the first predetermined upward force is applied by the coiled tubing, the biasing means adapted to move the release tool mandrel downwardly within the fishing neck housing to reset the release tool when the upward force is reduced below a downward force of the biasing means;
• and
• a shear pin movably connecting the fishing neck housing to a slot in the release tool mandrel.

A release tool to attach coiled tubing to a bottom hole assembly in a well bore, comprising:

• a fishing neck housing functionally associated with the bottom hole assembly;
• a release tool mandrel attached to the coiled tubing and adapted to move axially with respect to the fishing neck housing upon the application of an upward force on the coiled tubing;
• and
• a reset mechanism, the reset mechanism functionally associating the fishing neck housing and the release tool mandrel such that a predetermined combination of a first upward force may be applied for a corresponding first amount of time to the release tool mandrel without releasing the bottom hole assembly, and such that the after the application of the predetermined combination of the first upward force for the first amount of time, the application of a second upward force will release the bottom hole assembly from the coiled tubing,;
• a collar locator adapted to detect collars in a casing of a well bore, the collar locator having a collar locator mandrel attached to the coiled tubing and the release tool;
• a key mounted within a key retainer and about the mandrel;
• and
• a spring, the spring being located between the mandrel and the key to urge the key into contact with the casing, and
• a filter in a port to allow the key to move radially when encountering a collar in the casing.

A release tool for usc with coiled tubing to connect a bottom hole assembly with the coiled tubing, the release tool comprising:

• a release tool mandrel functionally associated with a fishing neck housing;
• and
• a reset mechanism allowing a user to apply varying combinations of a first upward force for a first predetermined length of time to the wiled tubing without releasing the bottom hole assembly from the coiled tubing, the reset mechanism also allowing the user to apply a second predetermined upward force to the release tool via the coiled tubing after the application of the varying combinations of the first upward force for the first predetermined length of time, to release the bottom hole assembly from the coiled tubing, in which the reset mechanism further comprises:
• a biasing means;
• a balance piston attached to the release tool mandrel;
• an upper chamber below the balance piston and above a crossover;
• and
• a lower chamber below the crossover above a lower piston,
• the biasing means adapted to bias the mandrel in a lower-most position within the
• fishing neck housing to oppose the upward force applied via the coiled tubing,
• the crossover having a pressure release valve and a flow restricter, the upper and lower chambers having hydraulic fluid, the pressure release valve preventing fluid communication between the upper and lower chambers until a first predetermined upward force is applied to the release tool via the coiled tubing, the flow restricter adapted tocontrol fluid communication from the lower chamber to the upper chamber after the first predetermined upward force is applied to the release tool via the coiled tubing;
• and a shear pin movably connecting the bottom hole assembly to a slot in the release tool mandrel, the shear pin adapted to connect the release tool mandrel to the fishing neck housing until a second predetermined force is applied via the coiled tubing to shear the shear pins.

A method for dislodging a bottom bole assembly lodged in a well bore, comprising:

• providing a release tool to connect the bottom hole assembly to coiled tubing, the release tool in an original position having
• a fishing neck housing functionally associated with the bottom hole assembly;
• a release tool mandrel attached to the coiled tubing and adapted to move axially with respect to the fishing neck housing upon the application of an upward force on the coiled tubing;
• and
• a reset mechanism, the reset mechanism functionally associating the fishing neck housing and the release tool mandrel such that a predetermined combination of first upward force may be applied for a corresponding first amount of time without releasing the bottom hole assembly, and such that after the application of the predetermined combination of the first upward force for the first amount of time, the application of a second force will release the bottom hole assembly from the coiled tubing;
• applying an initial force to the release tool;
• removing the first upward force applied to the coiled tubing to reset the release tool to the original position;
• applying a second upward force for a second predetermined time such that the release tool will not return to the original position;
• and
• applying a third force to partially disconnect the bottom hole assembly from the coil tubing.

A release tool to attach coiled tubing to a bottom hole assembly in a well bore, comprising:

• a fishing neck housing functionally associated with the bottom hole assembly;
• a release tool mandrel attached to the coiled tubing and adapted to move axially with respect to the fishing neck housing upon the application of an upward force on the coiled tubing;
• and
• a reset mechanism, the reset mechanism functionally associating the fishing neck housing and the release tool mandrel such that a predetermined combination of a first upward force may be applied for a corresponding first amount of time to the release tool mandrel without releasing the bottom hole assembly, and such that the after the application of the predetermined combination of the first upward force for the first amount of time, the application of a second upward force will release the bottom hole assembly from the coiled tubing, wherein the predetermined combination of first upward force for the corresponding first amount of time includes the combination of the application of approximately up to 15,000 lbs. upward force over string weight for up to about 30 minutes and the predetermined combination of up to about 60,000 lbs. over string weigh for up to about 5 minutes;
• and
• a balance piston pressure relief valve to provide fluid communication out of the first chamber and into the well bore.