Development of Self-Healing Cement Slurry through the Incorporation of Dual-Encapsulated Polyacrylamide for the Prevention of Water Ingress in Oil Well

Abstract

In the present work, a novel cross-linked polymer was synthesized though the anionic polymerization of cyanoacrylate with moisture as an initiator, methylene-bis-acrylamide as a cross-linker, and linseed oil as a spacer. Two layers of the synthesized polymer was coated over polyacrylamide for its homogenous impregnation in Class-G cement slurry for the synthesis of cement core. Fourier Transformation Infrared spectroscopy and X-Ray diffraction spectrum of the synthesized polymer and cement core were obtained to investigate the presence of different functional groups and phases. Moreover, the morphologies of the dual-encapsulated polyacrylamide was observed through scanning electron microscopy. Furthermore, the water-absorption capacity of the synthesized dual-encapsulated polyacrylamide in normal and saline conditions were tested. A cement core impregnated with 16% of dosage of dual-encapsulated polyacrylamide possesses an effective self-healing capability during the water-flow test. Moreover, the maximum linear expansion of the cement core was observed to be 26%. Thus, the impregnation of dual-encapsulated polyacrylamide in cement slurry can exhibit a superior self-healing behavior upon water absorption in an oil well.

Effect of Elastomeric Expandable Additive on Compressive Strength and Linear Expansion of Fly-Ash-Based Strength-Enhanced Geopolymer Cement for Shrinkage-Resistant Oil-Well Cementing

“…In parallel with the impact on PV, as presented in Figure 6, as the concentration of R-additive was raised from 10% to 15%, 20% and 25%, YP also increased from 3.8 N/m 2 to 6.7, 10.1 and 12.3 N/m 2 , respectively. The increase in PV and YP with respect to the increase in concentration of R-additive is in agreement with the findings of Richhariya et al [21], which employed dual-coated polyacrylamide (DPAM) as the additive, where it was deduced that the higher PV was obtained as a result of the gelation characteristics of the slurry, and the concentration of DPAM of 16% resulted in optimal rheological characteristics, as further additions of DPAM beyond 16% did not exhibit further variations of PV.…”

“…It instigates the formation of micro-annulus cracks due to contraction of the external dimensions of the cement [16,17] and de-bonding between the cement, casing and formation [18,19]. Elevation in the casing pressure is then induced as a result of the migration of gas and liquid from the formation [20,21] that, in due course, may lead to failure of the cement sheath.…”

Experimental Study and Design of Experiment Using Statistical Analysis for the Development of Geopolymer Matrix for Oil-Well Cementing for Enhancing the Integrity

“…Since geopolymer research is relatively new for oil well-cementing applications, these results are compared with the available research on API class-G cement. The fresh paste properties and the mechanical properties obtained for these formulations align with the literature's reported results and satisfying the API specifications for wellcementing [11][12][13][14]. www.videleaf.com…”

“…To avoid cement shrinkage, cement must expand instead of shrinking by adding the chemical that makes the cement expand [9,12,13]. The formation of cracks in the cement sheath allows for the migration of fluid to increase the casing pressure [10,14]. The extended service life of the cementing system is essential for the integrity of the wells.…”

“…The extended service life of the cementing system is essential for the integrity of the wells. www.videleaf.com There are usually two methods to enhance cement's service life: repairing cracks or adding self-healing additives to design the cement matrix [14]. Cement expansion is evaluated by measuring cement's linear expansion using international standard API RP 10B-5/ISO 10426-5:2003 [6].…”