Design of a new experimental coiled tubing injector

Coiled tubing (CT) injector is the key component of the CT equipment which is used to carry CT down into or out of the wellbore. So its performance will directly affect the success of the CT operations. This paper designed a new experimental CT injector, calculated its injection capacity when injecting CT with OD 38.1 mm and ID 32.9mm, designed and calculated its key components - sprocket chain and motor. Meanwhile, in order to make CT preferably pinched by the clamping block during the pressing process, finite element software was used to analysis the stress of CT. The results of the analysis show that when the V-shaped angle of the clamping block is 60°, the interaction between the clamping block and CT is optimal, the process of the clamping is smooth and the CT will not be hurt by the injector. The work of this paper would develop the theoretical basis for the manufacturing of CT injector.