Method for fixing underground corrugated pipe

Abstract

The invention discloses a method for fixing an underground corrugated pipe. The method comprises the steps that S1. a plurality of fixing elements (2) are arranged along the axial direction of a corrugated pipe (1) at intervals and are mounted at the position of a trough (3) of the corrugated pipe (1); S2. the corrugated pipe (1) provided with the fixing elements (2) descends in a shaft; and S3. in the expansion process of the corrugated pipe (1), the fixing elements (2) are inserted into a well wall due to the wall of the corrugated pipe (1) for a certain depth. The method provided by the invention has the beneficial effects that the corrugated pipe can be fixed at the desired position in a drilling process, a well repairing process and other operation processes; the fixing effect is good; and the target stratum can be effectively sealed. The method has the advantages that the realization is easy, the reliability is high and the construction convenient; the fixing elements mounted in the trough in the transportation process can not deform due to squeezing, can not scratch other corrugated pipes, and also can not scratch a casing sleeve in the construction process, so that the corrugated pipe can be prevented from being damaged by the fixing elements in the expansion process of the corrugated pipe.

Description

technical field [0001] The invention relates to the technical field of fixing methods for expandable bellows, in particular to a method for fixing downhole bellows. Background technique [0002] With the deepening of exploration and development of oil and gas resources, the number of deep wells and ultra-deep wells at home and abroad is gradually increasing, and the difficulty of drilling is also increasing. Especially when drilling complex formations such as low pressure and leakage during construction, it is often necessary to run casing to seal and increase the casing layer, which will lead to too small completion hole, which will bring difficulties to later construction, and may even fail to drill The target layer caused the wellbore to be scrapped. Even if the target layer was drilled, the wellbore after drilling was too small to meet the requirements of wellbore reentry operations such as production, subsequent workover, and production stimulation. For this reason, pe...

AI Technical Summary

Problems solved by technology

However, the surface of the corrugated pipe lowered into the wellbore is smooth, and there is no connecting medium between the wall of the corrugated pipe after expansion and the well wall, which reduces the firmness of the corrugated pipe hanging in this interval

During subsequent construction operations (tripping, workover, etc.), the interaction between the downhole equipment and the bellows and the self-weight of the bellows may cause the bellows to slide up and down or fall into the bottom of the well, thus Cause the plugging failure of a specific layer in the wellbore, and have a serious impact on subsequent operations and production

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