Deep continental scientific drilling high-temperature resistant cementing material

Abstract

The invention relates to a deep continental scientific drilling high-temperature resistant cementing material which is characterized in that a formula comprises the following raw materials in percentage by weight: 1 class G cement in basic unit as well as 50% of ganister sand, 5% of silica fume, 4% of compound retarder, 1% of borax, 40% of water, 4% of sulfonated tannin and 0.08% of n-octyl alcohol which are in 1 basic unit of the class G cement in percentage by weight. According to the deep continental scientific drilling high-temperature resistant cementing material, in order to enable the continental scientific drilling construction to be carried out smoothly and the cementing quality to meet the standard, appropriate initial consistency in high temperature and pressure is developed, favorable flowability, stability and thickening time and less water loss are achieved, and a cement calculus body with higher strength is provided, so that the performance requirement of the cementing material and the cement calculus body after condensation in high temperature and pressure is satisfied.

Description

technical field [0001] The invention relates to a high-temperature-resistant cementing material for deep continental scientific drilling, which is a cementing material used for supporting and protecting casings in high-temperature, high-pressure ultra-deep wells for deep continental drilling, and belongs to the cementing method in the process of deep continental scientific drilling. Background technique [0002] Continental scientific drilling is the most direct, effective and reliable method to obtain the deep material of the earth and understand the information of the earth's interior. "Going to the sky, entering the earth, and going down to the sea" is a grand project for human beings to challenge nature. Continental scientific drilling is the forerunner of my country's plan to enter the earth project. With the long-term and rapid development of the social economy, my country is facing increasingly prominent problems in resources, energy, and the environment. It is urgent ...

AI Technical Summary

Problems solved by technology

[0003] At present, Continental Scientific Drilling often encounters problems such as high temperature and high pressure in the drilling process; lost circulation, well collapse, and shrinkage problems; supports the casing and prevents underground fluid from corroding the casing; affects normal drilling, and even causes damage to the wellbore in severe cases. Complicated issues such as scrapping

[0004] The main disadvantage of existing cementing materials is that under high temperature conditions (static temperature 220°C, dynamic temperature 260°C), the thickening time of the cementing material is short, which cannot meet the needs of the process, and the strength of the cementing material declines seriously under high temperature and high pressure conditions , cannot meet the quality requirements of scientific drilling and cementing