Properties of CT130 Grade Coiled Tubing

CT130 coiled tubing has high strength and high resistance to pressure, it is an important tool and has unique advantages in solving stimulation and stable production problems in ultra-deep and extended reach horizontal well, especially for the multiple stage fracturing and the plug milling in shale gas. In this paper the microstructure, mechanical properties, fatigue resistance of CT130 coiled tubing is studied. The results show that the microstructure of CT130 grade coiled tubing is the side plate ferrite and granular bainate. The properties analysis indicates that CT130 coiled tubing possesses 938MPa yield strength, 1018 MPa tensile strength, and the hardness is less than 333HV0.5，all these properties are met the industry design standard. It also possess superior internal and external pressure resistance. the collapse pressure of tube body is 200.4MPa，and bursting pressure reaches up to 219.1MPa. The fatigue life of Φ50.8×4.8mm CT130 coiled tubing is 31.2 percent higher compared with the same size of CT110 coiled tubing and the running depth increased 18.1 percent at least under the same condition.