By adding the said beads about 10%~15% of the ce-ment weight and adcquate amount of water into the cement slurry, the density of the cement slurry canbe reduced to a range of 1.18~1.60g/cm~3, by adding the of anti-breaking additive, dispersant andothers, the properties of the cement slurry can be adjusted in order to meet the construction requir-ement of the oil well cementing.

This paper presents an approach based on the Continuous Wavelet Transform(CWT) and the Fourier transform(FT) to identny the ultrasonic echoes in inspecting oil well cementing quality.

Lost circulation and low return velocity of cement slurry are difficult problems affecting the quality of oil well cementing jobs,while the fiber cement can be used to solve these problems. No experimental apparatus and methods are currently available to evaluate the performance of fiber cement in sealing lost circulation zones.

Using the hydromechanics basic equations of turbulence diffusion, this paper studies the models of the turbulence diffusions of the cement slurry and the mud in the spacer in oil well cementing, and derives the laws of the turbulence diffusion of the cement slurry and the mud in the spacer, as a result, presents the formulas of calculating the minimum volume of the spacer and the turbulent contacting time in well cementing, These formulas can be used for spacer design in well cementing in oil fields.

By adding the said beads about 10%~15% of the ce-ment weight and adcquate amount of water into the cement slurry, the density of the cement slurry canbe reduced to a range of 1.18~1.60g/cm~3, by adding the of anti-breaking additive, dispersant andothers, the properties of the cement slurry can be adjusted in order to meet the construction requir-ement of the oil well cementing.

This paper introduces the properties of cement additive, hollow float beads, and its application in oilwell cementing. The hollow float beads from flyash is light inert material obtained by screening thefloatage of the flyash of thermal power plant. By adding the said beads about 10%~15% of the ce-ment weight and adcquate amount of water into the cement slurry, the density of the cement slurry canbe reduced to a range of 1.18~1.60g/cm~3, by adding the of anti-breaking additive, dispersant andothers, the properties...

This paper introduces the properties of cement additive, hollow float beads, and its application in oilwell cementing. The hollow float beads from flyash is light inert material obtained by screening thefloatage of the flyash of thermal power plant. By adding the said beads about 10%~15% of the ce-ment weight and adcquate amount of water into the cement slurry, the density of the cement slurry canbe reduced to a range of 1.18~1.60g/cm~3, by adding the of anti-breaking additive, dispersant andothers, the properties of the cement slurry can be adjusted in order to meet the construction requir-ement of the oil well cementing.

Using the hydromechanics basic equations of turbulence diffusion, this paper studies the models of the turbulence diffusions of the cement slurry and the mud in the spacer in oil well cementing, and derives the laws of the turbulence diffusion of the cement slurry and the mud in the spacer, as a result, presents the formulas of calculating the minimum volume of the spacer and the turbulent contacting time in well cementing, These formulas can be used for spacer design in well cementing...

Using the hydromechanics basic equations of turbulence diffusion, this paper studies the models of the turbulence diffusions of the cement slurry and the mud in the spacer in oil well cementing, and derives the laws of the turbulence diffusion of the cement slurry and the mud in the spacer, as a result, presents the formulas of calculating the minimum volume of the spacer and the turbulent contacting time in well cementing, These formulas can be used for spacer design in well cementing in oil fields.

This article introduce a new filtrate bo reduction additive-G402 for oil well cementing and evaluating its properties and compatibility with other additives. This new additive have advantage with a gnd effect of filtrate las reduction, easy adjusting thickening time, good rheological property, low water abeorption rate and suit for large temperature range. The test results have shown the gnd effect with qualification rate of cementing abtained is 100%, and high quality rate is 75%, through applications...

This article introduce a new filtrate bo reduction additive-G402 for oil well cementing and evaluating its properties and compatibility with other additives. This new additive have advantage with a gnd effect of filtrate las reduction, easy adjusting thickening time, good rheological property, low water abeorption rate and suit for large temperature range. The test results have shown the gnd effect with qualification rate of cementing abtained is 100%, and high quality rate is 75%, through applications in cementing jobs about 20 wells