Coiled tubing logging (CTL) is used to deploy wireline logging tools in holes where they cannot naturally be deployed on their own. These conditions include deviated wells with significant drag or where descent is not easy. Operations are essentially the same, with the cable permanently connected to the tool string at all time. This is accomplished by installing an electric line inside the coiled tubing to transmit electrical power and control signals to the tool and to receive data from the tool string. The mechanical properties of the coiled tubing are used to convey the wireline tools in the wellbore. In certain applications fluid or gas can be simultaneously pumped through the coiled tubing while logging.