Synthesis, Property and Mechanism Analysis of a Novel Polyhydroxy Organic Amine Shale Hydration Inhibitor

Abstract

Based on the adsorption mechanism analysis of polyhydroxy organic compound on a shale surface, a novel polyhydroxy organic amine shale hydration inhibitor N, N, N′, N′-tetrakis (2-hydroxyethyl) ethylenediamine (THEED) was synthesized via a nucleophilic reaction by using diethanolamine and dibromoethane as raw materials. Its structure was characterized by Fourier transform infrared spectrometry (FTIR), Hydrogen Nuclear Magnetic Resonance (1H NMR) and Liquid Chromatography Mass Spectrometry (LCMS). The inhibition performance of THEED was studied by a shale rolling recovery experiment, a linear expansion experiment and the particle size distribution experiment. Results showed the shale rolling recovery rate in 2.0 wt % THEED solutions was up to 89.6% at the rolling condition of 100 °C × 16 h, and the linear expansion height of artificial shale core in 2.0 wt % THEED solutions was just 4.74 mm after 16 h. The average particle size of Na-bentonite (Na-MMT) in fresh water was 8.05 μm, and it was observed that the average particle size has been increased to 124 μm in 2.0 wt % THEED solutions. The shale hydration inhibition mechanism of the novel inhibitor THEED was analyzed by FTIR, Scanning Electron Microscopy (SEM) and X-ray diffractometry (XRD), we concluded that the nice shale hydration inhibition performance of THEED was achieved by means of intercalation and adsorption onto the surface of shale. The superior shale hydration inhibition property makes THEED promising in maintaining wellbore stability in drilling engineering.

The Inhibition Property and Mechanism of a Novel Low Molecular Weight Zwitterionic Copolymer for Improving Wellbore Stability

“…In recent decades, various compounds, such as simple inorganic monomeric amines, have been successfully employed as shale inhibitors in WBDFs. However, the temporary and low level of shale inhibition has limited their widespread application [5][6][7]. To overcome the performance-related shortcomings, some copolymers such as HPAM (Hydrolyzed polyacrylamide), hyperbranched polyglycerols, FA-367 (a zwitterionic polymer), PDADMAC (Polydimethyl allyl ammonium chloride) and polyamines have been investigated [8].…”

Evaluation and application of poly(ethylene glycol) as lubricant in water‐based drilling fluid for horizontal well in Sulige Gas Field

“…It may be that PEG has the typical properties of a non-ionic surfactant for its etherbased structure, which can spontaneously form a uniform, thin and dense lubrication film on the friction surface, thus reducing the viscosity coefficient of mud cake and improving the lubricity of drilling fluid. 37 Temperature resistance of PEG Temperature resistance is a key technical index in the application of drilling fluid lubricant, which is related to the depth of a drilled well. PEG at 0.1 wt% was added to freshwater-based drilling fluid to investigate the rheological properties and filtration and lubrication properties of the drilling fluid after hot rolling at 25, 90, 120 and 150°C.…”

Application of carboxymethylated carob bean gum as eco-friendly water based drilling fluids additive

“…Firstly, there was a typical substitution of CBG and sodium chloroacetate in the presence of sodium hydroxide as shown in Eq. (1).…”

“…It is a complex colloid-suspension multi-stage dispersion system formed by clay particles and various chemical agents. [1][2][3] During the drilling process, drilling fluids plays the role of carrying cuttings, maintaining the stability of borehole wall, balancing formation pressure, cooling drilling tools, and transmitting water power. 4 It is the key technology to ensure well formation, oil and gas reservoir discovery and to prevent collapse, stuck, leaking, blowout and other safety accidents during drilling.…”