Oil well cement for ultrahigh-temperature deep well and preparation method and application thereof

Abstract

The invention provides oil well cement for an ultrahigh-temperature deep well and a preparation method and an application thereof. The oil well cement for the ultrahigh-temperature deep well is prepared from the following components in parts by weight: 100 parts of oil well cement, 40 to 80 parts of first strength retrogression resisting agent, 3 to 10 parts of second strength retrogression resisting agent and 5 to 10 parts of filling agent, wherein the first strength retrogression resisting agent is silicon powder, and the second strength retrogression resisting agent is one of or more of aluminum oxide, aluminum hydroxide, zinc oxide, zinc hydroxide and strontium chloride. According to the oil well cement for the ultrahigh-temperature deep well, the problem of severe retrogression of long-term strength of existing oil well cement in the hydrothermal environment of the ultrahigh-temperature deep well at 200 DEG C to 240 DEG C can be solved, so that the well quality at high temperatureis effectively increased, interlaminar effective sealing is realized, the long-term sealing integrity of a shaft cement sheath is guaranteed, and the service life of an oil well is prolonged. In addition, the oil well cement has the advantages of simple preparation process and convenience in construction.

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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