A mechanical experiment system and method for downhole perforation explosion perforation string in oil and gas wells

Abstract

The invention discloses a mechanical experiment system of downhole perforation and explosion perforation pipe string in an oil and gas well, which comprises an experimental water pool, a perforation pipe string arranged in the experimental water pool, a signal amplifier arranged outside the experimental water pool and electrically connected in sequence, A / D converter and computer, the perforation string includes oil pipe, isolation pipe, casing, acceleration test sub-section A, shock absorber, acceleration test sub-section B and perforating gun connected in sequence from top to bottom; It also discloses experimental methods. The beneficial effects of the present invention are: the dynamic data of the downhole pressure field during perforation can be collected, including the annular pressure field during perforation and the time-domain change values ​​of the acceleration in the radial, axial and circumferential directions of the pipe string. It is of great significance to provide analysis basis for the occurrence mechanism of downhole accidents during drilling, guide construction operations to avoid accidents, ensure the strength requirements of pipe strings, and increase oil production rate.

Description

technical field [0001] The invention relates to the field of well logging technology in the process of developing oil and gas fields, in particular to an oil and gas well downhole perforation explosion perforation string mechanics experiment system and a method thereof. 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. [0003] Oil and gas pipe perforation completion is a well completion method that shoots perforating bullets from downhole perforating guns to penetrate the oil layer casing, cement sheath, and penetrate the oil layer to a certain depth to establish oil flow channels and improve production efficiency. However, during perforation, the explosion shoc...

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Problems solved by technology

However, compared with the cable conveying operation, the oil pipe conveying perforation operation has shortcomings in the perforation detonation method. The electric shock fire is used for cable conveyance, while the detonation of the oil pipe conveying operation is more complicated. Currently, there are: gravity detonation; oil pipe pressurized detonation; Annular pressurization detonation

However, research at home and abroad mainly focuses on the numerical simulation of dynamic and static mechanics, and the necessary experimental means and research methods are not perfect enough. Traditional simulation and testing methods are difficult to comprehensively test the dynamic response of the pipe string.

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