Study on characteristic properties and the influence of lignosulfonates on the thickening time of cement slurry and set cement in oil well cementing
Abstract
The study aims to evaluate the effect of lignosulfonate on the thickening time and compressive strength of cement at a dosage of 0.639 %BWOC. IR spectroscopy confirms that lignosulfonate possesses a well-defined structure featuring aromatic rings and sulfonate groups. EPR analysis demonstrates that lignosulfonate not only increases viscosity and reduces the hydration rate but also actively participates in chemical interactions within the cement matrix.
TGA and DTG analyses indicate that lignosulfonate undergoes a 2-stage thermal decomposition, beginning significantly at around 190°C, reflecting relatively high thermal stability. According to API Spec.10A and RP 10B-2 tests, the sample incorporating lignosulfonate exhibits a lower fluid loss of 0.552% compared to 0.644% for the HR-14LM sample, while the UCA compressive strength of both slurries reaches 500 psi within 8 hours. Furthermore, the average porosity decreases from 20.814% to 18.147%, and permeability is reduced from 0.033 mD to 0.006 mD when lignosulfonate is used. The thickening times to reach 100 Bc for the two samples are 6 hours 5 minutes and 6 hours 8 minutes, respectively.
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