Underground plugging device and under-pressure sucker rod and oil pipe lifting workover operation technology

Abstract

The invention discloses an underground plugging device and an under-pressure sucker rod and oil pipe lifting workover operation technology. A sealing convex seat with a sealing surface and a position limiting lug boss are arranged in an oil string; a rod pump is arranged in the part, positioned above the sealed convex seat, in the oil string in a matched way; the sealing surface of a sealing lug boss arranged on the rod pump is matched with the sealing surface of the sealing convex seat arranged in the oil string; an outer oil inlet hole is formed in the part, positioned below the position limiting lug boss, of the pipe wall of the oil string; an inner pipe is arranged in the section of oil string in a matched way; an inner oil inlet hole corresponding to the outer oil inlet hole of the oil string is formed in the pipe wall of the inner pipe; a sealing groove is formed in the part, positioned below the inner oil inlet hole of the inner pipe, of the pipe wall of the inner pipe; a sealing ring matched with the inner wall of the oil string in a matched way is arranged in the sealing groove; the upper end of the inner pipe is connected with the rod pump through a connecting-tripping device; and a pipe orifice formed in the lower end of the oil string is sealed. The structure is simple and reasonable; the performance is reliable; under-pressure sucker rod and oil pipe lifting workover operation can be realized; the underground pressure can be conveniently plugged for many times; and the safe, efficient, environment-friendly and energy-saving production can be realized.

Description

technical field [0001] The invention relates to an oil and casing operation tool in an oil field, which belongs to a device capable of sealing pipelines and isolating internal and external pressures of the pipelines, in particular a downhole plugging device and a workover operation technology for lifting and lowering sucker rods and oil pipes with pressure. Background technique [0002] During the production or workover of various wells in oil fields (such as oil wells, water wells, steam injection wells, etc.), sometimes it is necessary to block the pipeline to isolate the internal and external pressure sources of the pipeline. Such as: [0003] 1. During well workover, the lower end of the tubing needs to be blocked to avoid the downhole medium being ejected during the construction process, causing energy waste, environmental pollution, or safety accidents. [0004] At present, there is no similar product that can meet the above requirements. Generally, well killing fluid...

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Problems solved by technology

However, there is no such product at present. It is necessary to lower the rod pump and the sucker rod string and then suppress it. If a leakage problem is found, the sucker rod string must be raised, and then the tubing string must be raised, resulting in duplication of work.

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