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An integrated pipe string for well cementing and sand control and its application method

A pipe string and well cementing technology, which is applied in the field of well cementing and sand control in oil development operations, can solve problems such as failure to achieve bumping pressure, and achieve the effects of reducing development costs, shortening the development cycle of a single well, and reducing pollution

Active Publication Date: 2021-07-02
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, it solves the risks of shortcomings such as cement slurry backflow and failure to realize bumping, ensuring safe and reliable operation

Method used

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  • An integrated pipe string for well cementing and sand control and its application method
  • An integrated pipe string for well cementing and sand control and its application method
  • An integrated pipe string for well cementing and sand control and its application method

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing, the present invention will be further described:

[0034] An integrated pipe string for cementing and sand control, which is composed of an outer pipe string and an inner pipe string. The outer pipe string is sequentially connected with a suspension packer 2, a circulating sliding sleeve 3, and a cementing sliding sleeve from top to bottom. Sleeve 4, outer pipe packer 5, filling sliding sleeve 7 and single-flow valve guide shoe 13, the inner pipe string includes bumper nipple 1, balance mechanism 6, filling mechanism 8, classification Ball seat 9, closing tool 10, switch tool 11, positioner 12. Through this pipe string, the cementing and sand control operation can be completed in one trip of the pipe string in the slim hole, and the effective sealing of the mudstone and water layer in the cementing section can be realized, and the operation requirements of gravel packing in the sand control section can be realized.

[003...

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Abstract

The invention discloses an integrated pipe string for well cementing and sand control and a use method thereof. The pipe string is composed of an outer pipe string and an inner pipe string, and the outer pipe string includes suspension packers arranged sequentially from top to bottom , circulating sliding sleeve, cementing sliding sleeve, external packer, packing sliding sleeve and single-flow valve guide shoe, the inner string includes bumper joints, balance mechanism, filling mechanism, The graded ball seat, shut-off tool, switch tool and positioner can be lowered into the wellbore at one time to complete the cementing and sand control operations through the integrated pipe string. The external packer realizes the effective sealing of the mudstone and water layers in the cementing section, and the gravel packing operation requirements in the sand control section. The bumping of the cement slurry is realized through the bumping nipple, and the graded ball seat solves the problem of channel switching and The problem of cement slurry backflow shortens the development cycle of a single well, reduces the development cost, and minimizes the pollution of the cement slurry to the reservoir.

Description

technical field [0001] The invention relates to the technical fields of well cementing and sand control in oil development operations, and in particular relates to an integrated pipe string and method for well cementing and sand control. Background technique [0002] With the deepening of oil exploration and development in Bohai Oilfield, it is imperative to transform and rebuild old wells. Onshore oilfields have experience in sidetracking of original vertical wells for cementing and sand control, but offshore sidetracking, cementing and sand control completion technology is still a blank. Research is carried out so that this technology can be popularized and applied offshore, and it will become an effective conventional means for Bohai Oilfield to further tap potential, stabilize production and increase production. The current cementing and sand control integrated technology is first to carry out sand control in the lower target layer, and then carry out the cementing oper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13E21B43/04E21B21/00E21B33/12
CPCE21B21/00E21B33/12E21B33/13E21B43/04
Inventor 陈胜宏郝宙正魏爱拴王明杰董潮张少朋
Owner CHINA NAT OFFSHORE OIL CORP
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