Downhole string creeping testing method and device

Abstract

The invention discloses a downhole string creeping testing method and device. The downhole string creeping testing method and device is applied to testing and collecting downhole string creeping displacement, performing basic research on oil extraction equipment according to tested and collected data, and optimizing production and experiment equipment of mechanical oil extraction. According to thedownhole string creeping testing method and device, a section of oil pipe is connected at the lower end of a downhole production string to serve as a testing pipe, a testing friction piece capable ofproducing frictional scratches with the testing pipe is mounted inside the downhole string creeping testing device, the downhole string creeping testing device is fixed between a casing pipe and thetesting pipe, and the testing friction piece mounted inside the downhole string creeping testing device tightly abuts against the outer wall of the testing pipe; when the production string creeps anddrives the testing pipe to creep along, the testing friction piece can scratch the outer wall of the testing pipe. The downhole string creeping testing device comprises two embodiments including thatthe testing friction piece is mounted inside a lower plug or a testing steel ball is mounted inside a steel ball fixing ring to tightly abut against the testing pipe.

Description

technical field [0001] The invention relates to a testing method and a testing device for basic research on working conditions of downhole production strings in the petroleum industry, in particular to a creep testing method and a creep testing device for downhole strings, which are used for testing and collecting creep displacement of downhole strings, and according to tests and collections. The data are used for basic research on oil recovery equipment, production equipment and experimental equipment for optimizing mechanical oil recovery. Background technique [0002] At present, there are only theoretical calculation data for the creep displacement of the downhole rod string in the downhole in oil exploitation. Up to now, no experiments have been conducted to verify whether the theoretical calculation data is correct or not. Due to the complexity of the downhole working conditions, the gap between the theoretical calculation data and the actual creepage, and the real cre...

AI Technical Summary

Problems solved by technology

The detection principle adopts the "contact counting roller angular displacement sensor method", which has a complex structure and comprehensive test data, but when the counting roller rolls on the inner wall of the casing, it is easily affected by the corrosion and wear pattern of the inner wall of the casing and the change of the azimuth angle of the oil pipe creep. Influence, and it is only indirect measurement data, there must be a certain error with the real data

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