A production method of preset small-diameter pipes for sidetracking and slimhole wells

Abstract

The invention provides a production method of preset small-diameter pipes for sidetracked wells and slimhole wells. The specific steps are as follows: step 1, fracturing sidetracked wells and slimhole wells with an open-hole packer and the production of preset small-diameter pipes. The split pipe string is lowered to the predetermined position of the target reservoir to ensure that the casing packer is suspended at a position 10-15m above the window of the sidetracking well. The sand blaster is aimed at the reservoir that needs to be reformed, and multiple reservoir packers are stuck. The location of the reservoir stimulation section, while avoiding the casing collar; step 2, the pumped large-diameter steel ball is seated at the variable-diameter return sleeve, and when the pressure reaches 25Mpa, the casing packer and the reservoir are isolated Set the device; when the pressure reaches 35Mpa, drop the return barrel for 3 hands, and lift out the upper part of the return barrel. The invention injects fracturing fluid from the annular space of the oil casing, and the construction displacement can reach 6m 3 / min or more, the reconstruction scale can be expanded and the fracture extension distance can be extended; the liquid carrying capacity of the gas well can be improved, the production period of the gas well can be extended, and the production cost of the gas well can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of downhole operations in oilfield exploration and development, in particular to a production method for preset small-diameter pipes for sidetracking wells and slimhole wells, and specifically belongs to the technical field of repeated fracturing in oil and gas fields. Background technique [0002] As most oil reservoirs in China are gradually entering the middle and late stage of development, it is extremely urgent to effectively produce remaining oil in the formation and fully tap the potential of the reservoir. It is particularly urgent to maintain stable production in mature areas at low cost. Considering factors such as reducing drilling investment, land acquisition costs, and ground equipment costs, in the original As an effective technology, sidetracking new wellbore in old well intervals has been paid more and more attention. For reservoirs with many formations, it is of great significance to carry o...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of short service life of existing gas wells and great damage to reservoirs, the present invention provides a production method of preset small-diameter pipes for sidetracking wells and slimhole wells. Before fracturing, the small-diameter pipes are lowered into casings In the pipe, it avoids the downhole small-diameter pipe during the production process, which can reduce reservoir damage and prolong the life of the gas well

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