«Onshore and offshore oil and gas well construction»

Analysis of the effect of blast furnace slag, limestone and pulverized fly ash on portland cement properties

UDC: 622.245.422.4
DOI: -

Authors:

¹ Tyumen Industrial University, Tyumen, Russia

Keywords: cement slurry, blast furnace slag, limestone, fly ash, absorption

Annotation:

The use of some lightweight pozzolanic fillers as a partial replacement of oil well cement is caused by the creation of low-density cement compositions. Such systems are designed to provide zonal isolation of the annular space in the intervals of high reservoir temperatures and pressures in the areas where it is required to withstand a fairly high load and remain chemically inert when exposed to high temperatures and aggressive environments influence on the formed cement stone. However, materials with low pozzolanic content, such as fly ash, silica, and crushed granulated blast furnace slag, poorly develop strength at early stages and at normal temperatures. In addition, they have a long setting time, especially when used in large displacement volumes, i. e. exceeding 50 % of the dry cement weight. The purpose of the authors of the article is to study the formulations of cement slurries for oil and gas wells with improved properties, using the synergy that exists between fly ash, blast furnace slag and microsilica.

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