A kind of cementing cement for high temperature deep well and its preparation method and application

Abstract

The invention provides a cementing cement for high-temperature deep wells, a preparation method and application thereof. The cementing cement for high-temperature deep wells includes the following components by weight: oil well cement: 100 parts, anti-strength decay agent: 30-60 parts, anti-strength decay aid: 10-20 parts and high-temperature enhancer: 5 parts ~15 parts; wherein, the anti-strength fading agent is one or both of silica fume and microsilicon; the anti-strength fading additive is one or more of kaolin, zeolite, wollastonite and diatomaceous earth; high temperature enhancement The agent is selected from nano-bentonite, nano-TiO 2 and nano Fe 2 o 3 one or more of. The cementing cement for high-temperature deep wells provided by the present invention can solve the problem that the long-term strength of existing cementing cement stones will seriously decline under the hydrothermal environment of high-temperature deep wells at 150°C to 200°C, thereby realizing effective isolation between layers , to ensure the long-term sealing integrity of the wellbore cement sheath and prolong the life of the oil well.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to a cementing cement for high-temperature deep wells, 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 high-temperature deep wells with bot...

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Problems solved by technology

[0009] Aiming at the above-mentioned defects in the prior art, the present invention provides a cementing cement for high-temperature deep wells, which has a very outstanding ability to resist strength decline, and can solve the problem of high-temperature deep wells with cement stones in the range of 150°C to 200°C. The problem of severe long-term strength degradation in hydrothermal environments

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