Injection Heads for Coiled Tubing

Abstract

The invention discloses an injection head for coiled tubing, which includes a frame, two sets of sprocket chain mechanisms, several clamping blocks, a speed reducer and a hydraulic motor, a driving sprocket and a driven sprocket of the sprocket chain mechanism Both include two sprockets arranged in parallel and connected, and are connected by two chains. The above pins pass through their corresponding sliders. Both ends of each pin are set in the chute of the frame. The pins of the two sliders are connected by more than one oil cylinder, between the two chains of the same group. Both the driving sprocket and the driven sprocket are covered with circular roller chains. The roller chain includes several rollers with mandrels at both ends, and several connecting plates hinged on two adjacent mandrels. The roller chains are located between their respective sliders and chains. The invention has the advantages of simple structure and not easy to be damaged, prevents locking and jamming, and can ensure long-term normal work.

Description

technical field [0001] The invention relates to an injection head for conveying or recovering coiled tubing. Background technique [0002] In the field of oil and natural gas exploitation, coiled tubing needs to be transported or recovered downhole through the injection head; the existing injection head device includes a frame, two sets of sprocket chain mechanisms arranged on the frame, and the chain of each set of sprocket chain mechanisms There are several clamping blocks on the top, and the clamping blocks are provided with arc-shaped grooves. There are bearings installed on the mounting bases behind the chain, and the mounting bases on both sides are connected by oil and cylinders; when in use, the oil cylinders control both sides. The mounting bases are close to each other, and the bearings then push the chain and the clamping block so that the clamping blocks on both sides clamp the oil pipe. The hydraulic motor controls the two driving sprockets to rotate in the same...

AI Technical Summary

Problems solved by technology

[0002] In the field of oil and natural gas exploitation, coiled tubing needs to be transported or recovered downhole through the injection head; the existing injection head device includes a frame, two sets of sprocket chain mechanisms arranged on the frame, and the chain of each set of sprocket chain mechanisms There are several clamping blocks on the top, and the clamping blocks are provided with arc-shaped grooves. There are bearings installed on the mounting bases behind the chain, and the mounting bases on both sides are connected by oil and cylinders; when in use, the oil cylinders control both sides. The mounting bases are close to each other, and the bearings then push the chain and the clamping block so that the clamping blocks on both sides clamp the oil pipe. The hydraulic motor controls the two driving sprockets to rotate in the same direction through the reducer, and the chain drives the clamping block to move and transport the oil pipe downward. , the hydraulic motor rotates in the opposite direction, and the clamping block recovers the oil pipe; there is rolling friction between the bearing and the chain, which can reduce the conveying resistance; when the clamping block clamps the oil pipe and moves, the bearing needs to bear a large radial force Clamping force, while the bearing structure is more precise, it is easy to be damaged under this working condition, and once the bearing is short of oil, it is easy to lock up, the resistance of the oil pipe transmission becomes larger, and often jams, which cannot guarantee normal work for a long time

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