Downhole string dynamic response test system and test method under explosive blast

Abstract

The invention discloses a downhole string dynamic response test system and test method under explosive blast, relates to an ultra-deep oil-gas well string dynamic response test system and test method, and belongs to the technical field of well logging in the process of development of oil and gas fields. The test system comprises an acceleration test mechanical system and an electronic circuit and support software subsystem. The acceleration test mechanical system comprises an acceleration sensor and a test system shell. The test system shell is mainly composed of an accelerometer head, a buffer connecting member, a thermal insulation sleeve connecting member, a thermal insulation sleeve, a circuit board support, an external sleeve and a rear cover component. The acceleration sensor is isolated from the external high temperature condition by protection of the thermal insulation sleeve and can normally work in extreme circumstances. The invention also discloses the test method realized based on the test system. Axial, radial and circumferential acceleration of a perforating gun in the extreme circumstances can be measured, and the law of shock wave loading and the law of string dynamic response can be researched by analyzing and processing the measured acceleration information.

Description

technical field [0001] The invention relates to a dynamic response test system and a test method of a downhole pipe string under explosion impact, in particular to a dynamic response test system and a test method of an ultra-deep oil and gas well pipe string under perforation operation conditions, and belongs to the field of well logging technology in the process of developing oil and gas fields. Background technique [0002] The purpose of perforation operation is to form a passage between the wellbore and the oil and gas layer, which is a key link in the exploitation of oil and gas fields. The development and improvement of perforation technology has important practical significance and practical value for the efficient exploitation of oil and gas fields. Due to the complex and harsh downhole environmental conditions, the perforating operation process is becoming more and more complicated, and the possibility of instability and damage of the wellbore and pipe string also in...

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Problems solved by technology

[0003] At present, research at home and abroad is mainly focused on the numerical simulation of dynamic and static mechanics, and the necessary experimental means and research methods are not perfect enough.

As for the specific experiment, since the test of the dynamic response of the downhole pipe string needs to be carried out in an area of ​​thousands of meters underground, the downhole temperature is close to 70 degrees Celsius. Such a temperature is likely to cause temperature drift of ordinary acceleration sensors, resulting in inaccurate measurement results. ; and the high temperature-resistant acceleration sensor is expensive, which increases the detection cost; in addition, due to the shell effect of the perforating bullet, the pipeline effect of the perforating gun, and the shock wave coupling effect generated by the multi-point explosion, the shock wave loading of the perforating section string The law and the dynamic response of the pipe string are extremely complex, and it is difficult to fully test the dynamic response of the pipe string by traditional simulation and testing methods

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