Development of new high-temperature-resistant cementing materials for medium-deep geothermal wells

Abstract:

Geothermal energy is a kind of clean， environmentally friendly and sustainable energy. With the proposal of “dual carbon” goals ， geothermal energy is becoming an important force to achieve the goal of net-zero emissions. With the continuous development of geothermal resources， the number of high-temperature and high-pressure deep geothermal wells is increasing， and the domestic geothermal wells have reached a new depth of 5000 meters. High-temperature and high-pressure environment is easy to cause the strength decline of cementing materials， admixture failure and excessive water loss， so the performance of high-temperature cementing materials is increasingly required. Therefore， a new high-temperature cementing material with excellent slurry stability， controllable thickening time， high stone strength and environmental protection is needed. Through analyzing the mechanism of cementing material components， orthogonal test and range analysis， a kind of high-temperature （120℃） resistant cementing material suitable for medium and deep geothermal wells is developed. The test results show that， the properties of cementing material such as density， water extraction rate， stone rate， thickening time， water loss， channeling resistance， stone compressive strength and flexural strength meet the requirements of cementing engineering in middle and deep geothermal wells.