Method for analyzing shaft passing capacity of cable pumping clustering perforation pipe string

Abstract

The invention discloses a method for analyzing shaft passing capacity of a cable pumping clustering perforation pipe string. The method comprises the following steps: S1, making a hypothesis accordingto the structural analysis and perforation process analysis of an underground cable pumping clustering perforation tool; S2, comprehensively considering the friction force between a downhole tool anda well wall, a flexible pup joint, shaft geometric limitation, pump thrust, axial tension, a pipe string variable cross-section, tool elastic deformation and the like, and establishing a cable pumping clustering perforation pipe string shaft passing capacity analysis model; and S3, establishing a complex coefficient equation set of the model by adopting a geometric analysis method and a longitudinal and transverse bending method, and solving the complex coefficient equation set. The method has the advantages that the cable pumping clustering perforation efficiency is effectively improved through the analysis method, the accidents that the pumping pressure suddenly rises and a fracturing bridge plug is set in advance due to the fact that the pipe string is suddenly stuck are avoided, and the risk that the pipe string is damaged due to the fact that the pipe string is 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

In 2013, Zhu Xiuxing et al. established the governing equation for the length of the joint pipe string under rigid conditions. Since the deformation of the pipe string was not considered, the calculation results were conservative

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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