High-temperature low-density cement and applications thereof

Abstract

The invention relates to a high-temperature low-density cement and applications thereof, belonging to the field of building materials. The high-temperature low-density cement provided by the invention has excellent high temperature resistance and comprises the following components in percentage by weight: 30%-70% of cement substrate, 14%-40% of lightening material, 14%-30% of high-temperature strength stabilizer and 0.02%-0.10% of high-temperature retarder, wherein the high-temperature retarder is organic acid sodium salt, and the high-temperature strength stabilizer material is one of micro silicon and silicon powder or the combination of micro silicon and silicon powder. The cement has the characteristics of simple construction processes, high pulping rate, excellent high temperature resistance and the like, can be applied to special environments such as oil well cementing and the like, and can obviously improve well cementing quality and crude production rate. When the cement of the invention is used for well cementing operation and high-temperature oil production operation, the well cementing construction performance can be ensured, and the unabated performance of the strength of the cement stone at high temperature can be ensured.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a high-temperature low-density cement and its application. Background technique [0002] With the continuous progress of my country's oil exploration and development technology, more and more cementing problems of low pressure, easy seepage, easy leakage and long sealing section that were difficult to develop in the past are faced by petroleum technicians. The number of complex wells developed in low-pressure well areas is increasing, and low-pressure, easy-to-seep, and long-sealing section cementing are prone to "lost circulation" accidents. The most effective technical measure to solve "lost circulation" is to use low-density Oil well cementing. In the process of heavy oil production, superheated steam is injected into the formation through the ground, and the temperature of the superheated steam is above 300°C. The current low-density oil well cementing can only be applied t...

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Problems solved by technology

In the process of heavy oil production, superheated steam is injected into the formation through the ground, and the temperature of the superheated steam is above 300°C. The current low-density oil well cementing can only be applied to the formation temperature of about 20°C-90°C. Under these conditions, the strength of the cement stone formed by API series cement cementing will decline sharply, the cement stone will become loose, and the formation cannot be effectively sealed off, and interlayer fluids will channel through each other, shortening the life of the oil well, reducing production efficiency and recovery

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