Oil pipe design method and device of well completion pipe string and storage medium

Abstract

The invention discloses an oil pipe design method and device for a well completion pipe string and a storage medium, and relates to the technical field of oil-gas well engineering. The method comprises the following steps that initial working condition information of a well completion pipe string in a working stage is determined; in combination with the inner wall temperature and the outer wall temperature of the pipe wall of the oil pipe and the inner pressure and the outer pressure of the pipe wall of the oil pipe in the production increasing transformation and production process, the changevalue of the closed annuluspressure between the multiple packers is determined, and the pressure change value is introduced into the triaxial stress design of the oil pipe; to obtain the actual triaxial safety coefficient of the oil pipe in the working stage of a well completion pipe string. The pressure bearing capacity of the oil pipe is checked through the three-axis safety coefficient, the oil pipe with the enough pressure bearing capacity is selected to design the multi-packer open hole segmented well completion pipe string, the service life of the well completion pipe string is prolonged, and the production and operation cost is reduced.

Description

technical field [0001] The present disclosure relates to the technical field of oil and gas well engineering, in particular to a method, device and storage medium for tubing design of a well completion string. Background technique [0002] For reservoirs with strong heterogeneity and well-developed fractures, the completion string needs to be stimulated and stimulated. The multi-packer open hole segmented completion string has good adaptability to segmental fracturing or acidizing stimulation. The multi-packer open hole segmented completion string mainly includes tubing, a completion packer, a hanging packer, multiple open hole packers and supporting tools. [0003] When designing and selecting tubing for completion strings in the related art, the triaxial stress of the tubing after completion is calculated, and the triaxial safety factor of the tubing is obtained through the triaxial stress. If the triaxial safety factor of the tubing If it is not less than the safety fact...

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Problems solved by technology

[0004] The temperature change in the completion string will cause pressure changes in the closed annulus between multiple packers due to thermal expansion and contraction, and the pressure change in the closed annulus will change the triaxial safety factor of the tubing, resulting in the tubing in the actual working condition. The following triaxial safety factor deviates from the triaxial safety factor calculated based on the triaxial stress of the tubing after completion, resulting in a reduction in the pressure bearing capacity of the selected tubing, resulting in stimulation and normal production of the completion string During the stage, the tubing was damaged due to insufficient pressure bearing capacity, requiring frequent workover, which increased the production and operation cost of the completion string

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