Oil and gas well casing discarding operation device and method

Abstract

The invention discloses an oil and gas well casing discarding operation device and method. The oil and gas well casing discarding operation device comprises an operation rack, a lower operation platform is arranged at the bottom of the operation rack, a lifting device is arranged on the lower operation platform, the movable end of the lifting device is connected with a traveling hydraulic casing slip, and a fixed hydraulic casing slip is arranged at the bottom of the lifting device; a lifting rod is arranged on the operation rack, a rotary lifting arm is arranged on the lifting rod, and the rotary lifting arm is used for hanging a sleeve cutting device and/or a punching device. The oil and gas well casing discarding operation device and method is wide in application range and suitable for large casing lifting operation on the land and on the sea, due to the modular and high-integration design, the oil and gas well casing discarding operation device is compact in structure, small in occupied space and light in weight, and the oil and gas well casing discarding operation device is particularly suitable for small platform operation with limited offshore operation load and area.

Description

technical field [0001] The invention belongs to the field of oil and gas well abandonment operations, and in particular relates to a device and method for oil and gas well casing abandonment operations. Background technique [0002] In offshore oil and gas fields at the end of development, due to safety and environmental protection requirements, some wells with low production, no economic benefits or potential safety and environmental protection risks need to be sealed and abandoned. Therefore, the water-resisting casing needs to be recycled during the abandonment operation. Due to the sealing effect of cement on the casing, the lifting load is heavy. When abandoning wells in domestic offshore oilfields, most of them still use two strands of steel wire rope to connect the casing and lift it with the hook of the drilling and repairing machine. There is no special operation equipment in this field. , and did not form a professional operation method. Some foreign countries hav...

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Problems solved by technology

[0003] 1. The pull-out force control accuracy of the hook is low, the stability of the wire rope operation is poor, and there are certain safety hazards;

[0004] 2. The structure of the rotating system equipped with drilling and repairing equipment is huge and complex, the equipment cost is high, and the operation efficiency is low;

[0005] 3. Oxygen welding is used for casing cutting on offshore platforms, which is not conducive to environmental protection

[0007] 5. The casing slips are clamped manually, the clamping stability is poor, logic control cannot be realized, and the operation efficiency is low

[0008] 6. Using the crane arm to hoist the casing, the operation cost is high, the labor intensity is high, and the operation is inconvenient

[0009] 7. Most of them are not equipped with a sliding base, and the transportation between wells needs to be completely dismantled and reassembled, which is very inconvenient; a small number of drilling and repairing machines are equipped with a sliding base, because the weight of the sliding base is relatively high, and the requirements for the platform are high, so it is inconvenient to use

[0010] 8. The operation method is not fixed, and most of them use oxygen welding, cutting and drilling, which has low operation efficiency and high operation risk

[0011] 9. There is no fixed method, most of them are temporarily looking for hydraulic pipelines for flushing operations, the operation efficiency is low, and it is inconvenient to use

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