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Well cementation rubber plug used for seabed oil well

A technology for subsea oil wells and cementing plugs, which can be used in wellbore/well components, earthwork drilling, sealing/isolation, etc., and can solve problems affecting cementing quality, etc.

Active Publication Date: 2017-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the cementing operation, these muds will be mixed into the cementing cement, which will seriously affect the cementing quality

Method used

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  • Well cementation rubber plug used for seabed oil well
  • Well cementation rubber plug used for seabed oil well
  • Well cementation rubber plug used for seabed oil well

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing.

[0025] Generally, for a subsea oil well, the wellhead of the subsea oil well is arranged on the seabed surface and is connected to a drilling platform arranged on the sea surface through a riser extending to the sea surface. A casing is arranged in the subsea oil well, and a hollow drill pipe (not shown) communicated with the casing (not shown) is arranged in the riser. Typically, the diameter of the riser (not shown) is larger than the diameter of the open hole so that the annulus between the casing and the open hole communicates with the space between the riser and the drill pipe. These are well known to those skilled in the art and will not be repeated here.

[0026] figure 1 A top plug 100 and a bottom plug 200 connected in series of a cementing plug according to the present invention are shown. When using this cementing plug to cement a subsea oil well, it needs to ...

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Abstract

The invention relates to a well cementation rubber plug used for a seabed oil well. The seabed oil well is connected to a marine riser extending to the sea surface, a casing pipe is arranged in the seabed oil well, a hollow drill pipe communicated with the casing pipe is arranged in the marine riser, and the well cementation rubber plug is arranged in the casing pipe. The well cementation rubber plug comprise a basal plug and a top plug, wherein the basal plug and the top plug can be connected in series with each other in a separated mode, both the basal plug and the top plug comprise a perforative cavity, the cavity of the basal plug is provided with a radial-shrinkage part and a downstream area of the radial-shrinkage part is provided with a through-hole which can be opened and closed and an entitative type basal plug opening tool, the basal plug opening tool can penetrate through the cavity of the top plug and is jointed with the radial-shrinkage part of the basal plug, both the basal plug and the basal plug opening tool are provided with a plug wing of which the radial direction extends outwards, the plug wing of the basal plug can be in close contact with the inner wall of the casing pipe, and the plug wing of the basal plug opening tool can be in close contact with the inner wall of the drill pipe. When the well cementation rubber plug used for the seabed oil well is used, mud in the casing pipe and the drill pipe can be discharged, thus the quality of the well cementation is improved.

Description

technical field [0001] The invention relates to the field of oil and gas exploration and development, in particular to a cementing rubber plug used for seabed oil wells. Background technique [0002] With the deepening of human development and utilization of oil and gas resources, oil and gas exploration and development have shifted from land to sea. The wellhead of the subsea oil well is designed on the seabed, and the oil well extends from the seabed to the depth of the seabed land. A water riser is connected between the wellhead and the drilling platform on the sea surface, and a hollow drill pipe is arranged in the water riser to realize the connection between the drilling platform and the oil well. [0003] After setting the casing into the oil well, cementing still needs to be done. In the cementing operation, the drilling platform needs to put in the cementing cement, and the cement put in enters the inside of the casing through the drill pipe. Then the cement in t...

Claims

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Application Information

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IPC IPC(8): E21B33/134
Inventor 吴晋霞朱玉杰马兰荣詹美玲阮臣良
Owner CHINA PETROLEUM & CHEM CORP
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