Abstract
During the thermal recovery of heavy oil thermal recovery wells, improving the mechanical properties and integrity of the cement ring is of great significance for the safe and efficient exploitation of heavy oil resources. This paper studies the relative properties of calcium aluminate cement and three kinds of slags under the conditions of 50°C × 1.01 MPa and 315°C × 20.7 MPa. CAC-slag composite material performance was evaluated using the cement paste compressive strength and permeability tests to study the physical properties of CAC with blast furnace slag. X-ray diffraction analysis, scanning electron microscopy (SEM), and thermal analysis (DSC/TG) were carried out to investigate the mineralogical composition of CAC with blast furnace slag. Results show that adding blast furnace slag did not affect the performance of cement slurry. Moreover, C2ASH8 curing occurred at low temperature, the microstructure of CAC paste was compact, and the permeability resistance was improved, thus improving the low-temperature properties of neat CAC. When cured at a high temperature, the CAC paste was mainly hydrated with C3ASH4 and AlO(OH), which had a well-developed crystal structure. Adding blast furnace slag can improve the CAC resistance to high temperature.
Highlights
IntroductionDuring the process of thermal recovery, a cement sheath is used as a supporting casing and isolates the cementing intervals that can withstand steam environments of up to 300–350°C
Steam flooding is a thermal-recovery technique of heavy oil exploitation
This paper aims to explore the influence of the three blast furnace slags on the high temperature resistance of Calcium aluminate cement (CAC) for heavy oil thermal recovery, the physical and microscopic properties of CAC change during the simulated processes of cementing at 50°C × 1.01 MPa and steam drive oil at 315°C × 20.7 MPa
Summary
During the process of thermal recovery, a cement sheath is used as a supporting casing and isolates the cementing intervals that can withstand steam environments of up to 300–350°C This is a challenge for cementing materials for heavy oil thermal-recovery wells (Nabih and Chalaturnyk, 2014; Pang et al, 2018; Chai et al, 2022; Ding et al, 2021). Calcium aluminate cement (CAC) is used as refractory material and has characteristics of high strength, rapid hardening, and resistance to high temperatures over a long period of time (Kar et al, 2012; Idrees et al, 2021; Roig-Flores et al, 2021; Abolhasani et al, 2021).
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