US Patent 10385629 Dual coiled tubing head

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.