Abstract: A dual coiled tubing head has an outer coiled tubing connector, an inner coiled tubing connector, a central housing and a bottom housing. The inner coiled tubing connector fits within the outer coiled tubing connector such that a passage is created between the inner coiled tubing connector and the outer coiled tubing connector to allow for the passage of fluid through the outer coiled tubing connector. A central housing is connected to the outer and inner coiled tubing connectors. The central housing has a central passage, a peripheral downhole passage and an outlet. The peripheral downhole passages are in fluid communication with the outer coiled tubing connector. The bottom housing connects to the central housing. The bottom housing has a central passage. The central passage is in fluid communication with the peripheral downhole passages for permitting downhole flow of fluid from the exterior coiled tubing connector.

Abstract: A dual coiled tubing head has an outer coiled tubing connector, an inner coiled tubing connector, a central housing, a first piston and a bottom housing. The outer coiled tubing connector and inner coil connect to the outer coil and inner coil of dual coiled tubing. The inner coiled tubing connector fits within the outer coiled tubing connector such that a passage is created between an outer surface of the inner coiled tubing connector and an inner surface of the outer coiled tubing connector to allow for the passage of fluid through the outer coiled tubing connector. A central housing is connected to the outer coiled tubing connector and inner coiled tubing connector. The central housing has a central passage, at least one peripheral downhole passage and at least one outlet. The peripheral downhole passages are in fluid communication with the outer coiled tubing connector. A piston is housed within the central passage of the central housing.

Abstract: A method of sealing annular space between an upright outer tube and an upright inner tube extending within the outer tube along an axial direction thereof involves pouring a liquid seal material into the annular space onto a support member fitted within the annular space between the outer tube and the inner tube in a manner substantially closing around the inner tube. The liquid seal material is poured in an amount sufficient to fill radial space between the inner tube and the outer tube fully around the inner tube, the liquid seal material is then cured to form an annular seal between the inner tube and the outer tube. The method is useful in sealing of the annular spacing between the surface and production casing of a gas well and installing a venting system to facilitate controlled venting of the annular space.

Abstract: A cable head for use with coiled tubing electric line in well operations has upper and lower housings attached by a shearable connection to allow release of the lower housing and any downhole equipment carried thereon. A piston is slidable within the housing by fluid pumped through the coil tooling to release a locking mechanism that otherwise prevents the shearing disconnect of the housings. Flow ports in the housing to allow pumping or circulation of fluid through the cable head are positioned to remain continuously open, regardless of the piston position, to maximize the range of flow rates over which fluid can be circulated. The electric line of coiled tubing is only stripped of its armor past sealed receipt thereof in a cable passage below the flow path of the fluid, thereby avoiding exposure of the conductor to the fluid to minimize the potential for damage or failure.

Abstract: A cable head for use with coiled tubing electric line in well operations has upper and lower housings attached by a shearable connection to allow release of the lower housing and any downhole equipment carried thereon. A piston is slidable within the housing by fluid pumped through the coil tooling to release a locking mechanism that otherwise prevents the shearing disconnect of the housings. Flow ports in the housing to allow pumping or circulation of fluid through the cable head are positioned to remain continuously open, regardless of the piston position, to maximize the range of flow rates over which fluid can be circulated. The electric line of coiled tubing is only stripped of its armor past sealed receipt thereof in a cable passage below the flow path of the fluid, thereby avoiding exposure of the conductor to the fluid to minimize the potential for damage or failure.

Abstract: A method of sealing annular space between an upright outer tube and an upright inner tube extending within the outer tube along an axial direction thereof involves pouring a liquid seal material into the annular space onto a support member fitted within the annular space between the outer tube and the inner tube in a manner substantially closing around the inner tube. The liquid seal material is poured in an amount sufficient to fill radial space between the inner tube and the outer tube fully around the inner tube, the liquid seal material is then cured to form an annular seal between the inner tube and the outer tube. The method is useful in sealing of the annular spacing between the surface and production casing of a gas well and installing a venting system to facilitate controlled venting of the annular space.