Layered and segmented cementing device for sidetracking well and its use method

Abstract

The invention relates to a side-tracked hole layered and sectioned cementing device and an application method thereof. The technical scheme includes that the left end of a blind plug is connected witha first cementing tubing through a cementing mortar-injecting nipple, a self seal, water swelling rubber and a K344 packer are mounted on the outer side of the first cementing tubing sequentially, and the first cementing tubing is provided with mortar injection ports and circulating holes; mechanical switches, hydraulic switches and signal switches are connected to the upper end of the first cementing tubing sequentially, the left end of the signal switches is connected with the second cementing tubing, and side-tracking cementing strings for multiple oil production layers are formed to realize layered mortar injection and cementing. The side-tracked hole layered and sectioned cementing device has the advantages that by the process, layered and sectioned cementing of multiple oil production layers can be realized by feeding steel balls to compact from the ground simply, the hydraulic switches, the signal switches and the mechanical switches can be positioned at place by lifting the mortar injection core tube and releasing the circulating string, thereby bringing facilitating subsequent layered oil production; the whole process and operation is simple and easy to implement, and thedevice and the method also solve the problem of limit to diameter of the side-tracked hole.

Description

technical field [0001] The invention relates to a sidetracking well cementing device and a use method of an oil and gas field, in particular to a sidetracking well layered and segmented well cementing device and a use method. 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...

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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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