Novel downhole pipe

Abstract

The invention provides a novel downhole pipe used for solving the problem that an existing downhole pipe is poor in flexibility. The downhole pipe is formed by welding multiple sections of plastic pipes; the wall of the downhole pipe is at least provided with a weep hole; the bottom end of the downhole pipe is coniform; generally, the hot welding of the multiple sections of plastic pipes is finished in situ; and the plastic pipes are injection molding pipes or plastic steel spiral twined pipes. Compared with a cement prefabricated pipe, the novel downhole pipe has the advantages that a main body is an injection molding pipes or a plastic steel spiral pipe, so that the ring stiffness and intensity are higher, certain toughness is provided, especially a collapse accident can not happen to a water seepage section, and the success rate is 100%. Compared with a nodular graphite cast iron prefabricated pipe, the novel downhole pipe has the advantages that the main body is the injection molding pipe or the plastic steel spiral pipe, so that the cost is lower; and steel reinforced ribs are coated inside the novel downhole pipe, so that no rusting problem exists, and the whole service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of pipelines for motorized wells, in particular to a new type of downhole pipe, especially a special pipe for motorized wells. Background technique [0002] When drilling a well, a deep hole is first drilled below the ground, and then the downhole pipe is placed to form a machine-driven well. At present, the downhole pipe mainly includes two types. One is the cement prefabricated pipe. The well cement prefabricated pipe is implanted into the wellbore of the machine step by step, which has the characteristics of low cost and long service life. The existence of holes will reduce the strength of the prefabricated pipe and cause breakage. Once broken, the whole well will be scrapped. The second is the ductile iron pipe, which has high structural rigidity and strength, but the cost is also high, and in the process of long-term use, the corrosion of the ductile iron pipe is relatively serious, causing partial pol...

AI Technical Summary

Problems solved by technology

At present, the downhole pipe mainly includes two types. One is the cement prefabricated pipe. The well cement prefabricated pipe is implanted into the wellbore of the machine step by step, which has the characteristics of low cost and long service life. The existence of holes will reduce the strength of the prefabricated pipe and cause breakage. Once broken, the whole well will be scrapped

Second, ductile iron pipes have high structural rigidity and strength, but the cost is also high, and in the process of long-term use, the corrosion of ductile iron pipes is relatively serious, causing partial pollution of water bodies

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