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The main function of the injection head is to clamp the coiled tubing to overcome its own gravity, the friction of the wellbore on the coiled tubing and the upward jacking force of the downhole pressure on the coiled tubing, and to control the speed of the coiled tubing according to the needs of the operation, so as to push the coiled tubing into the well, or to lift it out of the wellbore, or to suspend it in the wellbore, or to lift it up and release it from the jam when it encounters obstruction in the operation.
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