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Well cementation rubber plug, well cementation method using same and staged fracturing device

A cementing rubber plug and cementing technology, applied in wellbore/well components, earthwork drilling, sealing/packing, etc., can solve problems such as scraping, overcome wear and fracture, reduce cementing construction risks, and improve The effect of cementing displacement efficiency

Inactive Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problem that the existing cementing plug is difficult to effectively scrape the inner wall of the casing and the inner wall of the sliding sleeve in the pipe string with a large change in inner diameter. In order to meet the above technical requirements, the present invention provides a A New Type of Cementing Rubber Plug

Method used

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  • Well cementation rubber plug, well cementation method using same and staged fracturing device
  • Well cementation rubber plug, well cementation method using same and staged fracturing device
  • Well cementation rubber plug, well cementation method using same and staged fracturing device

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Embodiment 1

[0035] figure 1 A schematic structural diagram of the cementing plug 100 according to the first embodiment of the present invention is shown. like figure 1 As shown, the elastic body 30 of the cementing plug 100 is a cylindrical elastic body 31 . The cylindrical elastic body 31 is in complete contact with the inner wall of the pipe string, which facilitates the effective scraping of the inner wall of the pipe string.

[0036]According to the present invention, the core 50 includes a body 51 covered by the cylindrical elastic body 31 and a guide head 52 extending out of the cylindrical elastic body 31 . The body 51 in the core body 50 is used to support the cylindrical elastic body 30, and the guide head 52 is used to guide the cementing plug 100 when it travels in the inner wall of the pipe string. Under the action of the guide head, the cementing plug 100 It can smoothly pass through the inner wall of the pipe string with different inner diameters and smoothly reach the im...

Embodiment 2

[0040] figure 2 A schematic structural diagram of the cementing plug 100' according to the second embodiment of the present invention is shown. like figure 2 As shown, the cementing plug 100' includes a spherical elastomer 30' and a spherical core 50'. When the cementing plug 100' with spherical elastomer is in use, the inner wall of the elastomer is always in close contact with and tangent to the inner wall of the pipe string, and the purpose of effectively scraping the inner wall of the pipe string can also be achieved. At the same time, the spherical cementing rubber plug 100' can also rotate while moving forward in the process of traveling under pressure, which is more conducive to effectively scraping the inner wall of the pipe string. In addition, the spherical cementing plug 100' is more flexible in use, and can smoothly pass through the inner wall of the pipe string with different inner diameters.

[0041] According to the present invention, the cementing plug is ...

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Abstract

The invention discloses a well cementation rubber plug which can pass through a tubular column with a variable inner diameter and finally achieve bumping with a bump-pressure seat. The well cementation rubber plug comprises a core body and an elastic body at least partially uniformly covering the outer surface of the core body, wherein the core body is used for supporting the elastic body or fixing the well cementation rubber plug to the bump-pressure seat, and the elastic body is used for making tight contact with the inner wall of the tubular column with the variable inner diameter and realizing relative sliding. According to the well cementation rubber plug, the outer surface of the core body is uniformly covered with the elastic body, and the outer surface of the elastic body makes complete contact with the inner wall of the tubular column, so that the well cementation rubber plug in the invention is different from a rubber bowl structure and the like of an elastic body of a well cementation rubber plug in the prior art. Elastic material of the elastic body has good elasticity so that the well cementation rubber plug can successfully pass through the tubular column with the different inner diameters and finally achieve bumping with the bump-pressure seat, and especially the well cementation rubber plug can successfully pass through a tubular column with a greatly variable inner diameter. The well cementation displacement efficiency is improved, and the well cementation construction risk is lowered.

Description

technical field [0001] The invention relates to the field of oil well completion, in particular to a cementing rubber plug and a method for using the cementing plug, and a staged fracturing device using the cementing rubber plug. Background technique [0002] Casing cementing and sliding casing staged fracturing technology is a new type of reservoir stimulation technology for the development of permeable oil and gas reservoirs, shale oil (gas) reservoirs and other unconventional oil (gas) reservoirs. Obvious technical advantages. Among them, the cementing rubber plug, which is used as a supporting sleeve for casing cementing and sliding sleeve, is the guarantee for safe and efficient cementing and post-fracturing construction after the tool is inserted into the well. The specific construction process is as follows: with a certain ball seat level difference or a full-diameter cementing sliding sleeve, according to the requirements of the reservoir reconstruction, the casing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/134
Inventor 魏辽郭朝辉马兰荣朱玉杰谷磊韩峰
Owner CHINA PETROLEUM & CHEM CORP
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