A cementing cement for ultra-high temperature deep wells and its preparation method and application

Abstract

The invention provides a cementing cement for ultra-high temperature deep wells, a preparation method and application thereof. The cementing cement for ultra-high temperature deep wells includes the following components by weight: oil well cement: 100 parts, first anti-strength decay agent: 40-80 parts, second anti-strength decay agent: 3-10 parts, filling Agent: 5-10 parts, wherein: the first anti-strength decay agent is silicon powder, and the second anti-strength decay agent is selected from one of aluminum oxide, aluminum hydroxide, zinc oxide, zinc hydroxide and strontium chloride or more. The cementing cement for ultra-high temperature deep wells provided by the present invention can solve the problem that the long-term strength of the existing cement stones in the ultra-high temperature deep well hydrothermal environment of 200°C to 240°C will seriously decline, thereby effectively improving the high temperature. Improve the quality of the wellbore, realize effective isolation between layers, ensure the long-term sealing integrity of the wellbore cement sheath, and prolong the life of the oil well. And it also has the advantages of simple preparation process and convenient construction operation.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to a cementing cement for ultra-high temperature deep wells and a preparation method and application thereof. Background technique [0002] Well cementing is the process of injecting cement into the annular space between the casing and the formation and solidifying to form a cement sheath. The purpose is to use the cementation and hardness of the cement sheath to achieve effective interlayer isolation, support and protection of the formation. Pipe, so as to ensure the long-term sealing integrity of the wellbore and prolong the life of the oil well. [0003] Good long-term wellbore integrity is of great significance to the normal and sustained production of oil wells. With the deepening of oil and gas exploration, the number of wells drilled in complex oil and gas reservoirs such as deep wells and ultra-deep wells is increasing, and ultra-high-temperature deep...

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Problems solved by technology

[0010] In view of the above-mentioned defects in the prior art, the present invention provides a cement for ultra-high temperature deep wells, which can solve the serious problem of long-term strength of existing cement stones in the hydrothermal environment of ultra-high temperature deep wells at 200°C to 240°C. recession problem

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