Cementing slurry with high temperature, high density and high toughness

Abstract

The invention discloses a cementing slurry with high temperature, high density and high toughness, which comprises the following ingredients by weight 100 parts of H grade oil well cement, 30-40 parts of silicon powder, 80-120 parts of a GM weighting agent, 0.6-0.8 parts of a suspending agent, 4-6 parts of a high temperature fluid loss reducer, 4.0-5.0 parts of a dispersant, 0.1 parts of an antifoaming agent, 5.0-6.0 parts of NaCl, 3 parts of latex and 57.35-59.72 parts of water. The density of the cementing slurry can reach 2.40-2.50gcm3, the cementing slurry can resist a temperature of 160 DEG C, and the cementing slurry has the advantages of good rheological property under high temperature, good settlement stability and good cement stone toughness, is suitable for cementing depth wellsand ultra-deep wells, and is in favor of improving the sealing quality and raising the quality of the wells.

Description

technical field [0001] The invention relates to the field of oil field drilling and cementing, in particular to a high-temperature, high-density and tough cementing cement slurry. Background technique [0002] With the continuous deepening of petroleum exploration and development, the well depth gradually increases, the formation pressure and temperature become higher and higher, the annular space gradually becomes smaller, and the toughness of the cement ring decreases. For example, Dina 2-14 well in Tarim Oilfield has been drilled to a depth of 5100m, and the mud equivalent density is 2.3g / cm 3 , the formation temperature reaches 152.℃, and some deep wells and ultra-deep wells have higher formation temperature and pressure. The medium-temperature conventional density cement slurry used for medium-deep well cementing can no longer meet the requirements. Therefore, it is necessary to develop high-density high-temperature toughness cement with better comprehensive performance...

AI Technical Summary

Problems solved by technology

[0004] 1. With the increase of cement slurry density requirements, the content of weighting agent becomes larger, the rheological properties of cement slurry become worse, and construction is difficult;

[0005] 2. Many domestic high-temperature cement admixtures on the market begin to degrade at 120°C, and it is difficult to meet the temperature resistance requirement of 160°C. The performance of cement slurry cannot be properly adjusted, construction is difficult, and the quality is not guaranteed; foreign high-temperature admixtures have better performance , the cementing success rate is high, but the cost is also high;

[0006] 3. The deep annular gap is small, and the use of fiber toughening is easy to cause plugging, and the construction risk is high, which may cause cementing failure

Images