Well cementation method for controlling hydration heat of cement paste and improving well cementation quality

A technology of cement slurry and heat of hydration, applied in chemical instruments and methods, wellbore/well components, earthwork drilling and production, etc., can solve the problem of uncertain cementing technology and difficulty in matching the cement slurry system with geological and engineering conditions Control and other issues to achieve the effect of promoting cementing technology, ensuring sustainable development, and reducing the risk of poor cementing quality

Active Publication Date: 2020-12-25
PETROCHINA CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, with the continuous progress of cementing technologies such as cementing admixtures, cementing slurry systems, cementing tools, and cementing technology, the quality of cementing and the prevention of annular pressure have been greatly improved to a certain extent. The technology is still a "have a way, not sure" technology, the reason is that although the cementing admixture, cementing slurry system, cementing tools, and cementing technology have been relatively mature, there are still cement slurry system and geological And the matching of engineering conditions is difficult to control accurately

Method used

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  • Well cementation method for controlling hydration heat of cement paste and improving well cementation quality
  • Well cementation method for controlling hydration heat of cement paste and improving well cementation quality
  • Well cementation method for controlling hydration heat of cement paste and improving well cementation quality

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Embodiment 1

[0047]This embodiment provides a method for cementing a purely overlapping section well. Since it is impossible to use different cement slurries for the same well, this embodiment uses different cement slurries for two similar wells. Cementing treatment and comparison of cementing quality, Moxi 009-4-X2 well and Gaoshi 001-X7 well are both 177.8mm casing tiebacks, that is, pure overlap section. Among them, Moxi 009-4-X2 well uses conventional cement slurry, and Gaoshi 001-X7 well uses cement slurry that controls the heat of hydration. The specific control is to reduce the degree of hydration heat release of cement slurry and reduce cement The way to reduce the hydration heat release rate of the slurry is to reduce the amount of accelerator and early strength agent in the cement slurry to reduce the peak of the hydration heat release of the cement slurry, while increasing the amount of retarder added to extend the cement slurry The thickening safety additional time can reduce the pea...

Embodiment 2

[0054]This embodiment provides a method for cementing a short overlap section well, which is to cement the Moxi 008-X23 well (177.8mm liner), that is, the short overlap section, without allowing tail slurry to enter the overlap section.

[0055]The Moxi 008-X23 well uses cement slurry to control the heat of hydration. The specific control is:

[0056]Lead slurry: Compared with tailing slurry, use a lower amount of accelerator and early strength agent to reduce the peak hydration heat release of cement slurry; compared to tail slurry, use a higher amount of retarder to extend the thickening time to reach cement The additional time required for slurry thickening safety reduces the peak and rate of hydration heat release of cement slurry;

[0057]Tailing slurry: Compared with the leading slurry, the use of a higher accelerator and early strength agent content increases the peak hydration heat release of the cement slurry; compared to the leading slurry, the use of a lower retarder content short...

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Abstract

The invention provides a well cementation method for controlling hydration heat of cement paste and improving the well cementation quality. According to the method, by controlling the hydration heat release degree and / or hydration heat release rate of the cement paste, the hydration heat release condition in the process of forming set cement by curing the cement paste is improved, the cementing quality of the set cement and an interface is improved, and the well cementation quality of an open hole section and / or an overlapping section is further improved. The invention provides the well cementation method for controlling the hydration heat of the cement paste and improving the well cementation quality for the first time, belongs to the staged and milestone type breakthrough of the well cementation technology, can greatly promote the technical progress of the well cementation industry, provides powerful technical support for improvement of the well cementation quality of an oil-gas welland reduction of the annulus pressure risk, and has great significance to guarantee the sustainable development of exploration and development of oil and gas resources.

Description

Technical field[0001]The invention relates to a cementing method for controlling cement slurry hydration heat and improving cementing quality, and belongs to the technical field of petroleum cementing.Background technique[0002]With the continuous progress of the exploration and development of oil and gas resources, the long-term safe and effective operation of oil and gas wells puts forward higher requirements on the integrity of the wellbore. The integrity of the cement ring seal is the core of the integrity of the wellbore. The sealing integrity of the cement ring is generally expressed through the macroscopic performance of the cementing quality and the annulus pressure at the wellhead, and is a key manifestation of the cementing technology to ensure good interlayer isolation.[0003]Cementing is a one-time, concealed project, and it is a comprehensive technology that requires consideration of materials, mechanics, thermodynamics, and chemistry. At present, with the continuous adva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13C09K8/487
CPCE21B33/13C09K8/487C09K8/467C04B28/02Y02W30/91C04B2103/12C04B2103/14C04B2103/40C04B2103/46C04B2103/50C04B7/527C04B14/042C04B14/043C04B14/06C04B14/106C04B14/24C04B14/34C04B14/368C04B18/141C04B22/0013C04B22/0093C04B22/066C04B22/085C04B22/10C04B22/124C04B22/14C04B22/143C04B24/003C04B24/04C04B24/10C04B24/16E21B33/14
Inventor 刘硕琼张华靳建洲徐明于永金齐奉忠曲从锋乐宏郑有成李维马勇郑友志黄昭袁进平丁志伟周崇峰张弛刘子帅纪宏飞郭玉超夏修建李勇沈吉云刘慧婷冯宇思吕斌
Owner PETROCHINA CO LTD
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