High temperature and high pressure step-by-step packing and unpacking multi-stage fracturing tubular column and application method thereof

Abstract

The invention provides a high temperature and high pressure step-by-step packing and unpacking multi-stage fracturing tubular column and an application method thereof. According to the fracturing tubular column, in the fracturing construction process, controllable packers and sand blasters which correspond to a target construction stage position and are used in a matched mode can be opened when ball fracturing is conducted only once, and the fracturing construction process can be simpler and more convenient; step-by-step packing of a packer at the fracturing construction stage position, non-packing of a packer at the non-construction stage position and step-by-step unpacking of a packer at the constructed stage position can be achieved, sealing performance of the packer at each stage can be effectively checked, times of repeated packing and unpacking of the packers is reduced, sealing efficiency of all the packers of the tubular column is improved, and after fracturing construction is ended, the tubular column is easy to pull out.

Description

technical field [0001] The invention relates to a high-temperature, high-pressure step-by-step setting and unsealing multi-stage fracturing pipe string and a use method thereof, which are mainly used for staged fracturing construction of high-temperature and high-pressure oil and gas wells, and belong to construction tools for well completion operations. Background technique [0002] In recent years, oil and gas field fracturing technology has become more and more mature, and packer mechanical fracturing technology has become the main technology to improve single well production in oil and gas fields. However, there are some problems in the process of a large number of on-site fracturing operations; [0003] 1. Conventional multi-layer pressure dividing strings use multiple packers to cooperate with multiple sandblasting sliding sleeves. When fracturing a certain layer, all the packers are set and sealed, and it is impossible to effectively inspect each stage. The sealing pe...

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Problems solved by technology

[0003] 1. Conventional multi-layer pressure dividing strings use multiple packers to cooperate with multiple sandblasting sliding sleeves. When fracturing a certain layer, all the packers are set and sealed, and it is impossible to effectively inspect each stage. The sealing performance of the packer can easily lead to layer channeling and affect the effect of fracturing;

[0004] 2. In high-temperature and high-pressure wells, the packer is repeatedly set and unsealed, and the sealing performance of the rubber cartridge is reduced, resulting in poor sealing of the packer and reducing the service life of the packer;

[0005] 3. After the fracturing construction is completed, the tools are prone to sand burial and sand jamming, and the overall pipe string is difficult to lift out, resulting in the impossibility of subsequent measures.

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