Layered segmented well cementing device for sidetracking drilling

Abstract

The invention relates to a layered segmented well cementing device for sidetracking drilling. The layered segmented well cementing device is characterized in that the left end of a plug is connected with a first cementing oil pipe through a short cementing ash section; a self-sealing unit, a water-swelling rubber and a K344 packer are installed successively at the outer side of the first cementingoil pipe; and an ash injection hole and a circulating hole are formed in the first cementing oil pipe. A mechanical switch, a hydraulic switch and a signal switch are connected to the upper end of the first cementing pipe successively. A second cementing pipe is connected to the left end of the signal switch; sidetracking drilling cementing pipe columns of a plurality of oil extraction layers areformed and layered ash injection and cementing are realized. The layered segmented well cementing device has the following beneficial effects: layered segmented cementing of the multiple oil extraction layers is realized by simple steel ball injection and pressing on the ground; the hydraulic switch, the signal switch, and the mechanical switch are arranged at the right places by lifting the ashinjection core rube and releasing a circulating pipe column, so that the follow-up layered oil extraction is realized conveniently. The whole process and operation are simplified and are convenient toimplement; and a problem of diameter limitation of the sidetracking drilling is solved.

Description

technical field [0001] The invention relates to a cementing device for sidetracking wells in oil and gas fields, in particular to a layered and segmented well cementing device for sidetracking wells. Background technique [0002] During the exploitation of oil and gas fields, there are a large number of waste gas wells (that is, wells with no exploitation value), and among these wells, there are still good wells nearby, and there are a large number of unexploited oil and gas layers. In order to save resources and save mining costs, Therefore, oil operators generally adopt the sidetracking method, and the sidetracking technology is to fix a skewer at a certain depth in the oil-water well, use its inclined plane to create and guide the deflection, and use the milling cone to drill the side of the casing. A complete set of technology for drilling a new wellbore through the window and then lowering the liner for cementing. [0003] In addition, many of the sidetracking wells ar...

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Problems solved by technology

[0004] In the process of layered extraction, due to the complex structure of the tools required, the inner diameter of the pipe string is affected, and the inner diameter of the pipe string is just a very important parameter in oil production. It is a sidetracking process. In this way, the diameter of the sidetracking hole is a limited parameter. If the traditional method is adopted, that is, cementing first and then delamination, there are great difficulties in the implementation process due to the small diameter.

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