Mechanics experiment system and method for perforated string in underground perforating blasting of oil-gas well

Abstract

The invention discloses a mechanics experiment system for a perforated string in underground perforating blasting of an oil-gas well. The system comprises an experiment water pool, a perforated string arranged in the experiment water pool, a signal amplifier, an A / D converter and a computer, wherein the signal amplifier, the A / D converter and the computer are arranged outside the experiment water pool and are sequentially electrically connected; the perforated string comprises an oil pipe, a packing tube, a sleeve, an acceleration testing short joint A, a damper, an acceleration testing short joint B and a perforating gun which are sequentially connected from top to bottom. The invention further discloses an experiment method. The system and the method have the beneficial effects that the dynamic data of an underground pressure field can be acquired during perforating, including an annulus pressure field, and the radial, axial and circumferential acceleration time domain variation value of the string during perforating, thus the analyzing basis is provided to analyze underground accident occurrence mechanism of perforating; the construction and work are guided to avoid accidents; the system and the method are of important significance in ensuring the string intensity demand and increasing the oil yield.

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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