Interlaminar shear resistant strength testing method

Abstract

The invention discloses an interlaminar shear resistant strength testing method which comprises the following steps: (1) shearing a composite material pipe into a plurality of test samples with same lengths along an axial direction, and respectively detecting the test samples and the rest pipe through a clamp detection mechanism and a releasing tool; (2) respectively testing the plurality of test samples sheared through a clamp testing mechanism, determining a minimum value of maximum pressure values of the plurality of test samples as the interlaminar shear resistant strength value F1, testing to obtain the shearing failure load F2 of a releasing connector through the releasing tool, calculating the interlaminar shear resistant strength value tau1 of the test samples by adopting a formula, and calculating the shearing failure strength tau2 of the releasing connector by adopting a formula; (3) calculating the corresponding relation coefficient alpha by adopting a formula; and (4) increasing the safety coefficient beta aiming at a downhole tool made from different composite materials, and acquiring pumping pressure P, namely the interlaminar shear resistant strength value, during the interlaminar failure of the downhole tool by adopting a formula. The interlaminar shear resistant strength testing method disclosed by the invention can be used for reducing the well completion construction failure caused due to insufficient interlaminar shear resistant strength of the composite material pipe.

Description

Technical field [0001] The invention relates to a testing method, in particular to a method for testing the interlaminar shear strength of composite materials used for processing and manufacturing non-metallic downhole tools. Background technique [0002] With the large-scale development of unconventional oil and gas reservoirs and high temperature and high pressure oil and gas reservoirs, higher requirements are put forward for the performance of completion tools. Compared with metal materials, non-metallic materials have the advantages of corrosion resistance, high strength, light weight, easy drilling and milling, and easy backflow. Since the 1990s, the technology of using non-metallic materials to manufacture downhole tools has developed rapidly . During the development of downhole tools and the selection of composite materials in the domestic petroleum industry, it was discovered that the winding type glass fiber reinforced composite material has good application prospects ...

AI Technical Summary

Problems solved by technology

[0004] At present, there is no test method for testing the axial interlaminar shear strength of wound composite pipes for making downhole tools, and according to the test method, it is judged whether the interlaminar shear strength of the wound composite pipes meets the requirements

In particular, pipes are affected by changes in processing parameters during the manufacturing process. For example, there are too many interlayer fiber bonding defects, resulting in interlayer shear strength that cannot meet the requirements. However, it is difficult to distinguish with the naked eye. If there is no test method for layer The misuse of such tubing due to testing for inter-interval shear strength can easily lead to failure of well completion construction

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