Bridge plug gunpowder-driven multi-stage perforation method

Abstract

The invention discloses a bridge plug gunpowder driving type multilevel gun perforation method. The method comprises the following steps of a, a bridge plug seat seal combined operation pipe string is sent to a target layer in a cable transmission manner, according to the structure of the pipe string, a multilevel ignition device, an ignition head, a bridge plug seat seal tool, a connecting rod component and a bridge plug are sequentially connected, and bridge plug gunpowder is arranged in the bridge plug seat seal tool; b, a main line is communicated with a bridge plug gunpowder line, the main line is not communicated with an upper level perforation gun line, and negative electricity is powered on to ignite the bridge plug gunpowder; c, gas pressure generated by the bridge plug gunpowder enables the bridge plug to be set, and meanwhile the gas pressure enables circuit switching to be carried out on a microswitch of the multilevel ignition device; d, after circuit switching, the main line is not communicated with the bridge plug gunpowder line, the main line is communicated with an upper level gun perforation gun line, positive electricity is powered on to ignite an upper level perforating gun, and therefore multilevel gun perforation work is achieved. Through the cable transmission manner, bridge plug seat seal and perforation combination can be completed through one-time well descending, and the foundation is laid for subsequent fracturing operation.

Description

technical field [0001] The invention relates to a bridge plug gunpowder-driven multi-stage perforation method, which belongs to the technical field of oil and gas well cable multi-stage perforation, is suitable for common perforation operations, and is especially suitable for perforation operations in shale gas exploitation, and can be used in vertical wells or horizontal well. Background technique [0002] In the multi-stage perforation method of oil and gas wells, the conventional methods are as follows: (1) Electronic multi-stage perforation method: When the pipe string is lowered to the predetermined position, the ground can input the correct code to the electronic switch to conduct, and the power supply is instant. It can detonate bridge plug gunpowder or perforating gun; for example, a coded graded perforating instrument disclosed in Chinese Patent Publication No. 202628047U, the publication date is 2012-12-26. (2) Detonation-type multi-stage perforation method: posit...

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Problems solved by technology

[0003] However, the existing multi-stage perforation method for oil and gas wells still has the following disadvantages: the electronic multi-stage perforation method will have abnormal communication during the downhole process. Going down the well after piping strings will affect the normal progress of the perforating operation and delay the progress of the operation; the detonation multi-stage perforating method is easy to cause misoperation by personnel. The equipment at the operation site will be evacuated, and the workover machine will enter the operation site, which takes a long time and is labor-intensive

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