Pipeline targeted descaling method

Abstract

The invention discloses a pipeline targeted descaling method. The pipeline targeted descaling method comprises following steps: S1, the position of a segment with dirt is calculated based on a pipeline inlet pressure break point when a positioning spherical pig runs in a pipeline; S2, the segments before and after the segment with dirt are provided with a soft spherical pig respectively for isolation, the two ends of the segment with dirt are blocked so as to form a descaling area, and a descaling agent is delivered to fixed points of the descaling area so as to form a descaling system, wherein the descaling agent comprises a solid retarded acid, a corrosion inhibitor, a penetrant, and a complexing agent; S6, after standing of 0.5 to 1h, full contact and dissolving of the descaling agent with accumulated dirt are realized; and S7, the descaling agent and the soft spherical pigs are removed. According to the pipeline targeted descaling method, the segment with dirt is isolated from the rest segments, qualified and fixed point delivering of the scaling agent can be realized, descaling of the segment with dirt can be carried out with pertinency, a result that the whole pipeline is full of the descaling agent is avoided, damage caused by the descaling process on the pipeline is reduced, high efficiency using of the descaling agent is realized, and operation cost is reduced greatly.

Description

technical field [0001] The invention relates to descaling technology, in particular to a targeted descaling method for long-distance oil and gas transmission pipelines. Background technique [0002] At present, in the field of long-distance oil and gas pipeline transportation, the material to be transported is mainly transported to the designated place through the pipeline. The condition of the pipeline is directly related to the normal operation of related production activities, and scaling is an important factor affecting the normal operation of long-distance pipelines. It will not only reduce the efficiency of pipeline transportation, but also cause safety accidents such as corrosion and leakage. Therefore, how to effectively solve the fouling problem of long-distance pipelines has always been a major problem in the industry. [0003] The existing descaling methods mainly include: 1. Chemical descaling, that is, selecting suitable chemical reagents to soak the whole pip...

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Problems solved by technology

[0003] The existing descaling methods mainly include: 1. Chemical descaling, that is, selecting suitable chemical reagents to soak the whole pipeline. The disadvantage of this method is that the whole pipeline needs to be descaled, resulting in high cost and long cycle. Pipelines, equipment and the environment have huge side effects; 2. High-pressure water jet descaling, that is, the high-pressure water pumped out by the plunger pump is sprayed to the scale layer through a special nozzle, and the scale is strongly eroded and removed. The disadvantage of this method is that there is no need for scale removal. Targeted positioning leads to high water consumption, and the sludge will not decompose after peeling off, which will cause the sludge to accumulate in the downstream to form new blockage points and cause more serious consequences. It is not suitable for long-distance oil and gas pipelines for descaling; 3. Mechanical Descaling, that is, using a pig to scrape and peel off the scale and accumulations, the disadvantage of this method is that it has limited effect on the dense scale that has formed, and there is a significant risk of the pig blocking the pipeline

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