高温下G级油井水泥强度的衰退及合理硅砂加量

Decline of cement stone strength and the right amount of silica sand added to cement slurry at high temperature

研究了G级油井水泥在不同温度条件下的水泥石强度变化,分析了温度、硅砂加量对水泥石强度的影响,确立了水泥石产生高温强度衰退的临界温度分别为110℃和150℃,给出了高温下抑制强度衰退的合理硅砂加量为30%～40%,为进一步选择和设计深井G级水泥浆体系提供依据.

Characteristics of development and change of compressive strength properties of class G oil well cement are studied under different temperatures. The effect of temperature and additives on compressive cement strength are analyzed. Critical temperatures under which the strength begin to decline are 110℃ and 150℃ respectively, and the right amount of silica sand which will be added to the cement slurry to enhance the strength of hardening paste is determined to be 30%～40%. Thus basis is provided for further selection and design of cement slurry system of class G deep wells.