Oil pipe elevators play a vital role in the maintenance of oil and water wells in oilfields by Chinese oil companies. Fix the tubing with tubing elevators, lower the tubing into the well in a single way, and lift them up when the oil and water well is repaired. The tubing elevator plays an important intermediary role in this process, but the tubing elevator often causes many problems when it is put into use. These problems will threaten the safety of workers to a certain extent and easily cause casualties. So, it is imperative to solve these problems.

In the process of downhole operation in the oil field, the operation of lowering the tubing is often required. In the process of lowering the oil pipe, the elevator and the oil pipe will swing with the rise of the hook and the movement of the swimming block. At this time, the oil pipe is often buckled obliquely when it is docked, causing the oil pipe to hang when it is lifted.

At the same time, the hook spring will be compressed when it is lifted. If the oil pipe is tripped at this time, the elevator, hook, lifting ring and oil pipe will bounce together with the sudden release of the tension, causing the oil pipe elevator pin from the lifting the card body pops out, and the lifting ring will be released from the elevator card.

However, the staff cannot see the above situation, so they will replace the tubing buckle and lower it, which will cause the tubing to break and fall into the well, which will have an impact on the project, and may cause secondary operations or even stoppages. The progress of the project is very unfavorable.


Similarly, in the downhole construction of the oilfield, the lifting operation of the oilfield is the same as the lowering operation of the oil pipe, which is also a very frequent operation.

When the tubing is lifted up from the well, the shackle operation will be performed first, but there are still remaining buckles connected to it, so when the tubing is lifted, it will bounce up due to the buckle, and the tubing hanger pin will Popped out of the elevator, the ring will also fall off the elevator to form a single ring. In the process of processing a single lifting ring, if the popped lifting ring is not hooked back to the elevator, the single oil pipe will be stuck on the slideway and then rebound and hit the elevator, which will cause another lifting ring to be ejected from the elevator.

It will not be within the control range and will fall off together, which will not only cause the oil pipe to fall off but also may cause casualties. This poses a certain threat to the safety of workers. Once such a casualty accident occurs, it will not only affect the production safety of the enterprise but also bring some spiritual and economic losses to the workers’ families.

The pin handle of the elevator is the most frequently used part of the elevator in use, and it is also the most vulnerable part of the elevator, so it is also the most prone to safety problems, mainly because the inner spring of the handle is used for a long time in actual construction. The middle elasticity will be weakened, and in severe cases, it will not be able to support the pin handle to lock the crescent.

When the elevator lifts the oil pipe on and off, because the elevator locking device fails, the pipe string drives the crescent to rotate to open the elevator, causing the oil pipe to fall off and bring serious safety hazards or even personal injury.

Elevator is an important device for lifting and running tubing in workover operation. Its performance directly affects the efficiency and safety of workover operation. At present, the locking ring tubing elevator is widely used in Oilfield automatic workover.

However, the elevator in the existing technology often encounters loose handle screw in the construction process, which causes the locking ring to be not closed tightly and the tubing falls off. The elevator locking ring cannot be opened or closed tightly, resulting in the elevator can not be used normally. In addition, due to the relatively compact installation position of elevator equipment, such as How to solve these problems in limited space has become a difficult problem.

In response to this problem, Sanjack Group has developed a box-type elevator, including: elevator body, left elevator block, right elevator block, drive mechanism, transmission mechanism and anti-opening mechanism.

For this product, the box elevator includes the elevator body, the left elevator block, the right elevator block, the drive mechanism, the transmission mechanism and the anti-opening mechanism; by forming a clamping channel between the left elevator block and the right elevator block to the tubing Suspension; left or right elevator block can be driven by the power of the drive mechanism.

Open or close, the transmission mechanism is connected with the anti-opening mechanism. When the transmission mechanism moves, it will drive the anti-opening mechanism to move, so that the anti-opening mechanism lifts the restriction on the left or right elevator block; when the left elevator When the block and the right elevator block are closed, when the drive mechanism does not output power to the transmission mechanism, the anti-opening mechanism can limit the left elevator block or the right elevator block to the elevator body, alleviating the difficulty in the existing technology in the limited space The internal improvement of the elevator locking ring is not strict, causing the elevator to open unexpectedly and the tubing to fall, which has hidden safety problems.

In the downhole operation of the oil field, the lifting and lowering of the tubing is a regular work. During the operation, the elevator is the most commonly used main lifting equipment, but it is necessary to avoid the safety hazard caused by the failure of the elevator components, reduce the incidence of accidents, thereby improving the work efficiency, reliability, practicability and safety of construction.

This requires operators to pay more attention to checking the wear and tear of elevators during construction, control human error operations, repair and maintain elevators in a timely manner when they are found to be damaged, and conduct regular rigidity testing. This paper makes a brief analysis of the problems and hazards of oil pipe falling off. In the future, new types of oil pipe anti-falling elevators can be studied and used, and widely promoted and applied in branch companies.

100-elevator body 200-left elevator block; 300-right elevator block; 400-drive mechanism; 500-transmission mechanism; 501-transmission joint;502-connecting part; 512-rotating arm; 522-connecting pin; 503-first rotating shaft; 600-anti-opening mechanism; 601-second rotating shaft;602-force arm; 603-stopper; 604-elastic part; 700-arc hole; 701-first arc segment; 702-second arc segment; 800-linkage mechanism;801-third rotation shaft; 802-synchronous gear train; 900-conical through hole; 110-clamping channel.