Method and device for predicting impact pressure of perforation on packer under different working conditions

Abstract

The invention provides a method and device for predicting the impact pressure of perforation on a packer under different working conditions. The method includes: obtaining perforation data under different perforating working conditions; Perforation explosion load calculation model; obtain the peak pressure at the packer under different perforation conditions; fit the perforation explosion load and the peak pressure at the packer to determine the perforation shock wave attenuation model; based on the perforation explosion load Calculation model, perforation shock wave attenuation model and impact pressure change equation of perforation shock wave on packer, determine the impact pressure calculation model of packer under different perforation conditions; obtain actual perforation under actual perforation conditions Data, based on the calculation model of the impact pressure on the packer, determine the impact pressure on the packer under actual perforation conditions. This scheme can more accurately evaluate the safety of the packer under different perforating conditions.

Description

technical field [0001] The invention relates to the technical field of oil and gas well engineering perforation, in particular to a method and device for predicting the impact pressure of perforation on a packer under different working conditions. 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. In recent years, combined perforation testing has been widely used in the process of oil and gas well completion and oil testing. During operation, the perforating gun is often combined with the packer for joint operation. The packer is connected to the pipe string, and the packer After being fully set, a huge detonation wave is generated when the perforating gun is detonated, and part of the detonation wave will be released into the narrow and long space of the wellbore to form a dynamic impact load. It is transmitted to other string ...

AI Technical Summary

Problems solved by technology

Early research on perforation technology mostly focused on perforation parameters, but relatively few studies on perforation explosion impact. With the increase of perforation intensity and well depth, there are more and more perforation engineering problems. Its impact on the safety of pipe strings and packers has gradually attracted people's attention, but there is no detailed research on the safety of packers under different perforating conditions.

Images