Abstract
Inhibiting hydrate decomposition due to the friction heat generated by the drilling tools is one of the key factors for drilling hydrate formation. Since the existing method based on chemical inhibition technology can only delay the hydrate decomposition rate, a phase-change microcapsule was introduced in this paper to inhibit, by the intelligent control of the drilling fluid temperature, the decomposition of the formation hydrate, which was microencapsulated by modified n-alkane as the core material, and nano-silica was taken as the shell material. Scanning electron microscope (SEM), size distribution, X-ray diffraction (XRD), and Fourier transform infrared spectrometer (FT-IR) were utilized to characterize the structural properties of microcapsules. Differential scanning calorimetry (DSC) spectra displayed that the latent heat was 136.8 J/g in the case of melting enthalpy and 136.4 J/g in the case of solidification enthalpy, with an encapsulation efficiency of 62.6%. In addition, the prepared microcapsules also showed good thermal conductivity and reliability. By comparison, it was also proved that the microcapsules had good compatibility with drilling fluid, which can effectively control the temperature of drilling fluid for the inhibition of hydrate decomposition.
Highlights
Published: 12 September 2021The huge resource reserves of natural gas hydrate have made the drilling and development of hydrate formation a research hotspot [1,2]
This paper proposed a new idea of inhibitthesized by interfacial polymerization using modified n-alkane as the core material and ing the decomposition of formation hydrate by phase change microcapsules, which were nano-silica formed by simultaneous hydrolysis and polycondensation of TEOS and APTS
Microcapsules were prepared by interfacial polymerization, of which modified n-alkane was used as the core material, and nano-silica formed by simultaneous hydrolysis and polycondensation of TEOS and APTS was used as the shell material
Summary
The huge resource reserves of natural gas hydrate have made the drilling and development of hydrate formation a research hotspot [1,2]. Scholars have carried out a large amount of researches on PCMs, and the technology of temperature control has been developed gradually by storing energy in advance through material phase transition and releasing it at a suitable tempera of 13 ture [10,11,12,13] These PCMs are mainly divided into organic and inorganic compounds. This paper proposed a new idea of inhibiting pared with these shell materials, nano-silica can better improve the thermal conductivity, the decomposition of formation hydrate by phase change microcapsules, which were synshowing good hydrophilicity [22,23]. Schematic diagram diagram of of microcapsules microcapsules intelligent temperature-control in hydrate formation
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