A method for analyzing the passing capacity of cable-pumped clustered perforation strings

Abstract

The invention discloses a method for analyzing the passing capacity of cable-pumped clustered perforation pipe string wellbore, which includes the following steps: S1, structural analysis and perforation process analysis of the cable-pumped clustered perforation tool; S2, comprehensive Considering the friction between the downhole tool and the wellbore wall, flexible nipples, geometric constraints of the wellbore, pump thrust, axial tension, changing section of the pipe string, and elastic deformation of the tool, etc., an analysis model for the wellbore passage capacity of the clustered perforating pipe string by the cable pump is established ; S3, using the geometric analysis method and the vertical and horizontal bending method to establish and solve the complex coefficient equations of the model. The beneficial effects of the present invention are: the cable pumping cluster perforation efficiency is effectively improved through the analysis method, and accidents of sudden rise in pumping pressure and premature setting of fracturing bridge plugs caused by pipe strings being suddenly stuck are avoided. The risk of damage to the pipe string caused by being stuck is reduced.

Description

technical field [0001] The invention relates to a method for analyzing the passing capacity of cable pumping clustered perforation pipe string wellbore. Background technique [0002] In recent years, cluster perforation has brought revolutionary development to domestic perforation technology. In the cluster perforation operation, the cable transports the pipe string to the downhole target layer, and completes the bridge plug setting and multi-cluster perforation operations in sequence, such as figure 1 shown. As the main body of the perforating tool, the clustered perforating string plays a vital role in perforating operations. The length of perforating strings in clusters is often relatively large. For example, the string length of “1 bridge plug + 12 clusters of perforating guns” in Well XX202-H1 reached 17.8 m. As the number of clusters increases, the string length can even reach 20 m. . Under special well conditions such as irregular wellbore trajectory and high dogl...

AI Technical Summary

Problems solved by technology

However, for the flexible tool strings such as clustered perforation strings, such simplifications and assumptions are quite different from the actual situation, resulting in overly conservative prediction results.

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