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Tubing string stability and safety analysis-based downhole perforation test tool string optimization method

An optimization method and technology of test tools, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve the problems of large damage and failure of the pipe string, less dynamic behavior, etc.

Active Publication Date: 2017-08-15
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The perforated tubing string vibrates under the action of blast impact load, and there are few studies on its dynamic behavior, especially the coupling research on the tubing string-shock absorber-perforating gun. However, its damage to the tubing string and Failure has a great influence, and it is very important to understand the coupling mechanism between them to solve the impact of explosion load on pipe strings. However, there are few researches on this aspect at home and abroad

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  • Tubing string stability and safety analysis-based downhole perforation test tool string optimization method
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  • Tubing string stability and safety analysis-based downhole perforation test tool string optimization method

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Embodiment Construction

[0119] The present invention will be further described below in conjunction with accompanying drawing, protection scope of the present invention is not limited to the following:

[0120] A downhole perforation test tool string optimization method based on tubing string stability and safety analysis, which includes the following steps:

[0121] S1. According to the structural analysis of the downhole perforating tool and the analysis of the perforating process, the following assumptions are made: assuming that the materials of the tubing string and the perforating gun are uniform and isotropic; assuming that the shock absorber is a mass-spring-damping system, ignoring shock absorption The geometric shape of the packer and the inhomogeneity of mass distribution; the relative displacement between the packer and the tubing string is not considered, and it is regarded as a fixed support; the structural damping of the perforating string is ignored, and only the shock absorber and liq...

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Abstract

The invention discloses a tubing string stability and safety analysis-based downhole perforation test tool string optimization method. The method comprises the following steps of S1, building a tubing string-shock absorber-perforating gun dynamics model; S2, establishing an oscillatory differential equation of a perforated string; S3, establishing an oscillatory differential equation of a shock absorber; S4, establishing a tubing string-shock absorber-perforating gun coupled oscillation equation; and S5, solving a tubing string-shock absorber-perforating gun partial differential equation. The method has the beneficial effects that the research on the influence of tubing length and explosive charge of a perforating bullet on downhole tools is carried out, and the research shows that a stress of a packer is correspondingly increased along with the increment of the tubing length; a part, easily subjected to helical buckling, of a tubing appears in a position of the bottom and the middle of the tubing; along with the increment of the explosive charge, a pull pressure on the tubing is rapidly increased, and the tubing is subjected to the helical buckling more easily, so that theoretical guidance is provided for tubing string design; and the damage risk of a tubing string is lowered; and the downhole tools are protected.

Description

technical field [0001] The invention relates to an optimization method for downhole perforation testing tool strings based on the stability and safety analysis of oil pipe strings. 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 perforating technology has important practical significance and practical value for the efficient exploitation of oil and gas fields. The perforating operation requires the use of a perforating string system, which includes a shock absorber and a perforating string. The perforating string includes tubing and a perforating gun. The tubing is connected to the shock absorber, and the shock absorber is connected to the perforating gun. The perforating gun is filled with explosives for explosive perforation. When the perforating gun is perforated, the impact force generat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F2113/14
Inventor 柳军郭晓强刘清友王国荣刘咸宋志文李时德赵洪亮刘镇嘉
Owner SOUTHWEST PETROLEUM UNIV
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