Synthesis and retarder mechanism study of a novel amphoteric composite high temperature-resistant retarder for oil well cement.

Peng Zhigang,Feng Qian,Huo Jinhua,Zhang Bojian,Zhang Jian,Zou Changjun,Zheng Yong

doi:10.1039/c8ra01139g

Peng Zhigang, Feng Qian + Show 5 more

Open Access

https://doi.org/10.1039/c8ra01139g

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Journal: RSC advances	Publication Date: Jan 1, 2018
Citations: 18	License type: CC BY 3.0

Affiliation: Southwest Petroleum University

Abstract

An amphoteric composite polymer (hereinafter referred to as PAADM) as a high temperature-resistant cement retarder was prepared by in situ intercalated polymerization method with 2-crylamido-2-methylpropanesulfonic acid (AMPS), acrylic acid (AA) and two diallyl dimethyl ammonium chloride (DMDAAC) as monomers, and modified montmorillonite as an active polymerization filler. The synthetic composite polymer was characterized by Fourier transform infrared spectroscopy (FT-IR), H nuclear magnetic resonance (H-NMR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The results of the aforementioned characterization showed that the synthesized copolymer (PAADM) has an intercalation/exfoliation composite structure and excellent thermal stability. Performance evaluation evidenced that the cement slurry containing PAADM has good retarding property in the range of 120–200 °C, and demonstrated the rapid development of compressive strength under high temperature and low temperature conditions, this property could guarantee that the retarder PAADM could be applied to the construction of deep wells and long interval wells. Moreover, the retarding mechanism of PAADM was studied through calcium binding capacity, adsorption amount, zeta potential, XRD and SEM analysis, and it was found that “adsorption deposition” and “calcium complexation” should be responsible for this retarder delaying the hydration process of cement grains.

Highlights

In order to isolate the oil, gas and water layers to ensure the production and reparation of oil wells, the cementing operation is necessary in every oil and gas well.[1]
It is essential for cement slurry to remain pump-able during introduction into the subterranean formation and until the slurry is situated in the desired portion of the well to be cemented.[3]
To illustrate the molecular structure of the composite polymer, the Fourier transform infrared spectroscopy (FTIR) spectrum, H nuclear magnetic resonance (H-NMR) spectrum and X-ray diffraction (XRD) spectrum of montmorillonite, modi ed montmorillonite (O-MMT) and the obtained polymer PAADM. The amphoteric composite retarder (PAADM) are showed in Fig. 3–5 respectively

Summary

Introduction

In order to isolate the oil, gas and water layers to ensure the production and reparation of oil wells, the cementing operation is necessary in every oil and gas well.[1].

Results

Conclusion