A Cross Link Polymer Sealant for Curing Severe Lost Circulation Events in Fractured Limestone Formations (Russian)

Soliman, Ahmed H.; Fathallah, Mohamad Omar; Tobeh, Samir; Al-Oqab, Mohammad S.; Godara, Vijay K.

doi:10.2118/176533-ru

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The polymeric systems can act as loss prevention and sealing agents. Soliman designed an organic cross-link polymer system . Together with plugging materials, severe loss of circulation events can be cured.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multiple Hydrogen Bonding-Assisted High-Strength Hydrogel of Silica/Polyacrylamide Nanocomposite Cross-Linked with Polyethylenimine

Cui,

Wang,

Huang

et al. 2023

ACS Omega

View full text Add to dashboard Cite

The nanocomposite gel system has been successfully applied as a water shutoff agent to enhance oil recovery (EOR) or for plugging to control lost circulation events. In this study, the silica/polyacrylamide nanocomposite was synthesized via in situ free radical polymerization of acrylamide (AM) monomers in the presence of silica nanoparticles. The composite was cross-linked with polyethylenimine to prepare a high-strength hydrogel. The viscosity test was conducted to determine the gelation time of the gel. Rheological measurements and sand pack breakthrough pressure tests were carried out to measure the gel strength. Attenuated total reflectance-Fourier transform infrared (ATR-FTIR) and scanning electron microscopy (SEM) tests were adopted to characterize the structure and morphology of the gel. The results show that compared to polyacrylamide (PAM) gel, the gelation time of the nanocomposite gel will decrease with increasing gel elasticity modulus, and the breakthrough pressure of the nanocomposite gel is 29.82 MPa, which increased by 65%. As shown in the ATR-FTIR test, this can be attributed to the presence of multiple hydrogen bonds for the PAM molecule with both silica and quartz sand particles. In the composite gel, hydrogen bonding mainly forms between the O atoms of PAM and the H atom on the surface of silica, enhancing gel strength and elasticity modulus with more cross-linking density and less porosity. Moreover, H bonding between additional −NH 2 of PAM and quartz sand particles helps improve gel plugging pressure. However, in the silica and PAM mixture gel, the H bonding of silica occupies −NH 2 of PAM, which became unavailable to attach on the sand surface, reducing the breakthrough pressure by 30%, although it can enhance the rheological strength. This study suggests that in situ composite of silica in PAM can not only greatly improve gel rheological strength but also help maintain the strong adhesion of PAM molecules onto quartz sand, resulting in better plugging performance in the sand reservoir.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Soliman designed an organic cross-link polymer system. 18 Together with plugging materials, severe loss of circulation events can be cured. High-molecular-weight synthetic polymers used in the gel include polymers or copolymers of acrylamide (AM) monomers, poly(vinyl alcohol), polyacrylonitrile (PAN), etc.…”

Section: Introductionmentioning

confidence: 99%

Multiple Hydrogen Bonding-Assisted High-Strength Hydrogel of Silica/Polyacrylamide Nanocomposite Cross-Linked with Polyethylenimine

Cui,

Wang,

Huang

et al. 2023

ACS Omega

View full text Add to dashboard Cite

show abstract

“…A crosslinked polymer sealant is successfully applied for curing severe loss circulation while drilling in Kuwait across fractured limestone formations. 16 Ziad et al 17 reported the first successful reservoir isolation using exclusively a temporary gel plug that allowed safe and successful execution of a mechanical descaling operation without using CaCO 3 chips for well workover in hightemperature/high-pressure gas wells in Saudi Arabia. In addition, we extended the using of Cr 3+ /salt-tolerant polymer gel for well workover in low-temperature reservoirs and provide an avenue to bridge the design philosophy of well workover and water shutoff.…”

Section: Introductionmentioning

confidence: 99%

Environmental and strength‐enhanced nanosilica‐based composite gel for well temporary plugging in high‐temperature reservoirs

Jia

Yang

2018

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

Polymer gel is widely used for well temporary plugging in petroleum engineering. This paper researched on a novel environmental and strength‐enhanced composite gel plug prepared by the nanosilica, the polymer hydrolyzed polyacrylamide and environmental friendly crosslinker polyethyleneimine, and the effect of strength enhancement and thermal stability mechanism of the nanosilica in this system was investigated. The experiments results showed that with the increase of the nanosilica concentration, the elastic modulus and viscous modulus, the stress under the same strain and the gel decompose temperature both increased. For the system containing 8% nanosilica, the elastic modulus is about 14 times than the one without it, whereas the viscous modulus is only 70.98 Pa, which is favorable for lowering the absorption damage to the formation. The strain–stress experiment results showed that to reach 45% strain, the stress of 44.6 KPa needed to be loaded (for composite gel with 8 wt% nanosilica) and during the compress process, the gel deformed with no break and after the stress was released, it got back to the original shape soon, indicating its good mechanical and elasticity performance. The differential scanning calorimetry (DSC) results revealed that the after adding nanosilica, more free water can be kept so that the system's thermal stability was effectively improved. The scanning electron microscopic images displayed that the nanosilica particles closely adhere to the polymer network; thus, the 3D structure of the composite gel became more compact and the gel's strength was improved. In the last section, some recommendations for well temporary plugging are proposed.

show abstract

A Cross Link Polymer Sealant for Curing Severe Lost Circulation Events in Fractured Limestone Formations (Russian)

Cited by 2 publications

References 0 publications

Multiple Hydrogen Bonding-Assisted High-Strength Hydrogel of Silica/Polyacrylamide Nanocomposite Cross-Linked with Polyethylenimine

Multiple Hydrogen Bonding-Assisted High-Strength Hydrogel of Silica/Polyacrylamide Nanocomposite Cross-Linked with Polyethylenimine

Environmental and strength‐enhanced nanosilica‐based composite gel for well temporary plugging in high‐temperature reservoirs

Contact Info

Product

Resources

About