Method for running downhole tools and devices with coiled tubing

A method of conveying a well logging tool by a coiled tubing unit into a well bore having a wellhead, and in which the well logging tool is to be communicatively linked to surface equipment by way of an electrical cable, or optical cable, or a combined opto-electrical cable, the method comprising:

• a) providing a coiled tubing unit having a supply of coiled tubing and means for forcefully injecting and extracting the tubing into and out of the well bore;
• b) providing a well logging tool and means for attaching the well logging tool to the coiled tubing directly or indirectly to the tubing;
• c) providing at least one preselected length of cable having means for conducting electrical signals, optical signals, or a combination thereof;
• d) linking one end of the cable to surface equipment and linking one end of the cable to the downhole logging tool or to a cable connector that is in electrical and/or optical communication with the downhole logging tool and the surface equipment;
• e) providing and fluidly connecting a Y-connector to the wellhead of the well bore, the Y-connector having a branch having means for sealingly accommodating the coiled tubing therethrough, and a branch having means for sealingly accommodating the cable therethrough;
• and
• f) providing means for appropriately tensioning the cable as the cable and the tubing is simultaneously conveyed into, or out of, the well bore by way of the Y-connector when operating the coiled tubing unit accordingly.

A method of conveying a downhole tool containing a video camera by a coiled tubing unit into a well bore having a wellhead, and in which the downhole tool is to be a communicatively linked to surface equipment by way of an electrical cable, or optical cable, or a combined opto-electrical cable so that the video camera, in connection with the surface equipment, provides video images of the well bore that are viewable in real time, the method comprising:

• a) providing a coiled tubing unit having a supply of coiled tubing and means for forcefully injecting and extracting the tubing into and out of the well bore;
• b) providing a downhole tool containing a video camera and means for attaching the downhole tool to the coiled tubing directly or indirectly to the tubing;
• c) providing at least one preselected length of cable having means for conducting electrical signals, optical signals, or a combination thereof;
• d) linking one end of the cable to surface equipment and linking one end of the cable to the downhole tool or to a cable connector that is in electrical and/or optical communication with the downhole tool and the surface equipment;
• e) providing and fluidly connecting a Y-connector to the wellhead of the well bore, the Y-connector having a branch having means for sealingly accommodating the coiled tubing therethrough, and a branch having means for sealingly accommodating the cable therethrough;
• and
• f) providing means for appropriately tensioning the cable as the cable and the tubing is simultaneously conveyed into, or out of, the well bore by way of the Y-connector when operating the coiled tubing unit accordingly.