A step-by-step cement injection device
A step-by-step cementing and body technology, applied in wellbore/well components, geothermal energy power generation, sealing/isolation, etc., can solve problems such as complex construction technology and affecting mining operations
Active Publication Date: 2022-06-03
德州众凯石油科技有限公司
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Problems solved by technology
Although this technology can solve the problem of leaving no holes on the pipe string, the construction process is complicated, and the internal well accessories still need to be drilled in the later stage; and once the sealing ring on the tie-back plug fails, it will bring more serious consequences, affecting post-mining operations
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[0030] In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed", etc.
[0035] Specifically, four lock blocks 16 may be provided circumferentially.
[0045] 2) Carry out the normal casing operation.
[0050] 7) Construction ends.
[0055] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the various embodiments are described in a progressive manner.
[0056] The above is only an embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art
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This application discloses a graded cementing device. The graded cementing device is provided with a plurality of stepped structures on the body, and flow passages are opened on the step structures to form a labyrinth flow groove, and finally a labyrinth is formed on the body. In the cement sealing section, the cement forms a turbulent flow when it passes through the labyrinth cement sealing section. The turbulent flow makes the cement slurry fully bond and contact with the inner metal surface of the tool. After the cement slurry solidifies, a labyrinth cement seal is formed to achieve "reinforced concrete "Strength effect, realize high temperature resistance, high pressure and permanent sealing, improve tool strength, and play the role of auxiliary sealing at the same time.
Description
A graded cementing device technical field [0001] The present invention relates to the technical field of oil and gas well development, in particular to a grading cementing device. Background technique my country's coalbed methane resources are very rich, but the development of coalbed methane has low permeability due to poor stability of the target layer. For some reasons, the exploration and development of coalbed methane in my country is still in its infancy. In recent years, with the country's environmental protection and conservation focus on reducing emissions. In the field of oil and gas well development and development, along with the development of drilling and completion technology, the mining difficulty of oil and gas wells is becoming more and more difficult. higher. In the cementing and completion of deep wells, long-sealing wells, and low-pressure leaky wells, it is difficult for conventional cementing technology to meet the geological requirements and...
Claims
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IPC IPC(8): E21B33/13E21B33/134
CPCE21B33/13E21B33/134Y02E10/10
Inventor 孙崇磊李雷祥潘荣财
Owner 德州众凯石油科技有限公司