Low Molecular Weight Branched Polyamine as a Clay Swelling Inhibitor and Its Inhibition Mechanism: Experiment and Density Functional Theory Simulation

Xie, Gang; Xiao, Yurong; Deng, Mingyi; Luo, Yujing; Luo, Peng

doi:10.1021/acs.energyfuels.9b04003

Cited by 26 publications

(14 citation statements)

References 33 publications

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“…In addition, the hydrophobic groups in TGA molecules cover the surface of the clay crystal layer tightly, forming a hydrophobic barrier to prevent the entry and adsorption of water molecules, thus further inhibiting the hydration of clay. 22 , 23 …”

Section: Resultsmentioning

confidence: 99%

“…At the same time, the protonated amino group in the inhibitor molecule can compete with the water molecule and bond to the surface of clay crystals to destroy the structure of water. In addition, the hydrophobic groups in TGA molecules cover the surface of the clay crystal layer tightly, forming a hydrophobic barrier to prevent the entry and adsorption of water molecules, thus further inhibiting the hydration of clay. , …”

Section: Resultsmentioning

confidence: 99%

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Study of a Polyamine Inhibitor Used for Shale Water-Based Drilling Fluid

et al. 2021

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Here, we report a water-soluble shale inhibitor for inhibiting shale hydrate formation. The copolymer denoted as thermogravimetric analysis (TGA) was synthesized via triethanolamine, two maleic anhydrides, and glacial acetic acid. The infrared (IR) and gas chromatography (GC) results indicated that TGA is a low molecular weight polymer inhibitor (IR) and is the most commonly used method to identify compounds and molecular structures qualitatively. It is mainly used to study the molecular structure of organic substances and conduct qualitative and quantitative analyses of organic compounds. The main function of GC is for polymer molecular weight analysis. With the aid of shale rolling recovery experiments, particle size distribution experiments, triaxial stress experiment methods, bentonite slurry rate inhibition experiments, and thermogravimetric experiments to evaluate TGA inhibition characteristics, the inhibition effect of TGA is better than that of the traditional inorganic salt inhibitor KCl, polymer amine inhibitor UHIB, and organic cationic shale inhibitor NW-1. When the mass fraction is 0.2%, the cutting recovery rate increases from 18.3 to 94.1%. The compressive strength of the shale core after adding 1% TGA inhibitor is 177.9 MPa, which is close to the original core compressive strength of 186.5. The wet sodium montmorillonite crystal layer spacing after treatment with 0.5%, 1.5%, and 3% TGA aqueous solution is 1.38, 1.35, and 1.35 nm, respectively, and the sodium montmorillonite crystal layer spacing after diesel treatment is 1.34 nm, indicating that the inhibitory effect of TGA on sodium montmorillonite is equivalent to that of diesel and that TGA can effectively inhibit the hydration and dispersion of sodium montmorillonite. At the same time, the crystal layer spacing and the weight loss rate of sodium montmorillonite modified by TGA inhibitors did not change significantly after adsorption of deionized water, which proved that TGA inhibitors could be adsorbed in the crystal layer space of sodium montmorillonite to inhibit hydration and dispersion of sodium montmorillonite. Field test results show that TGA can significantly improve the inhibition performance of the field drilling fluid, and the effect is better than the strong conventional inhibition water-based drilling fluid system, which solves the problems of wellbore instability and considerable friction in horizontal shale sections and provides a new idea and method for efficient shale gas drilling.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Study of a Polyamine Inhibitor Used for Shale Water-Based Drilling Fluid

et al. 2021

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“…Water intrusion into the formation will cause many problems, such as formation pollution, shale hydration and swelling, and formation collapse. 8 − 10 At the same time, the thick filter cake formed on the borehole wall due to the water and particulate invasion can easily lead to problems such as borehole damage and stuck drilling. 11 , 12 The use of fluid loss additives can slow down the loss of water to the formation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Polymer/Graphene Oxide Composite as a Fluid Loss Agent for Water-Based Drilling Fluids

Pang

Zhang

et al. 2021

ACS Omega

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The wellbore instability caused by the penetration of drilling fluids into the formation is a vital problem in the drilling process. In this study, we synthesized a polymer/graphene oxide composite (PAAN-G) as a fluid loss additive in water-based drilling fluids. The three monomers (acrylamide (AM), 2-acrylamide-2-methyl-1-propane sulfonic acid (AMPS), N -vinylpyrrolidone (NVP)) and graphene oxide (GO) were copolymerized using aqueous free radical polymerization. The composition, micromorphology, and thermal stability properties of PAAN-G were characterized by Fourier transform infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA). According to the American Petroleum Institute (API) standards, the influence of PAAN-G on the rheological and filtration properties of bentonite-based mud was evaluated. Compared with PAAN, PAAN-0.2G has more stable rheological properties at high temperatures. The experimental results showed that even at a high temperature of 240 °C, PAAN-G can still maintain a stable fluid loss reduction ability. In addition, PAAN-G is also suitable for high-salt formations; it can still obtain satisfactory filtration volume when the concentration of sodium chloride (NaCl) and calcium chloride (CaCl 2 ) reached 25 wt %. Besides, we discussed the fluid loss control mechanism of PAAN-G through particle size distribution and scanning electron microscopy (SEM).

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“…This method increases the cost and dosage of inhibitors [34–38] . As functional groups were concerned, different cations or primary amine establishes interaction between inhibitors and bentonite [28,39–49] . The electrostatic attraction occurs between hydrated bentonite and the cationic inhibitors (such as KCl and 2,3‐epoxypropyl trimethylammonium chloride) [50–52] .…”

Section: Introductionmentioning

confidence: 99%

High Inhibition of Bentonite Hydration by Use of a Homopolymer Containing Synergistic Bi‐Functional Groups

Wang

Gao

2021

ChemistrySelect

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Most current inhibitors control bentonite hydration at the partial phase by the single adsorption mode. To improve inhibition and action range, we synthesized a novel homopolymer inhibitor (PIM‐NH2) containing bi‐functional groups. Comprehensive experiments investigated the inhibition of PIM‐NH2 and other inhibitors. In immersion and linear expansion experiments, the hydration swelling of bentonite cake was incredibly restrained in 0.75 % PIM‐NH2 solution. The greater contact angle between 0.75 % PIM‐NH2 solution and bentonite cake indicated the retardation of water invasion. According to XRD analysis, the intercalation of 0.75 % PIM‐NH2 reduced the bentonite lattice spacing from 1.91 nm to 1.27 nm with water discharge. All results suggested PIM‐NH2 had an outstanding performance at the lower concentration, and its inhibition covered the whole hydration process. Mechanism investigation revealed two synergistic adsorptions (hydrogen bond and electrostatic attraction) of bi‐functional groups exerted simultaneously to improve each other. In FT‐IR spectra, the hydrogen bond was confirmed by the special frequency movement from 1550 cm−1 to 1641 cm−1. The electrostatic attraction decreased the ζ potential absolute value from 29.55–33.20 mV to around 4 mV. In ESEM analysis, the bentonite treated by 0.75 % PIM‐NH2 showed larger aggregates and rough surfaces, demonstrating dehydration properties.

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Low Molecular Weight Branched Polyamine as a Clay Swelling Inhibitor and Its Inhibition Mechanism: Experiment and Density Functional Theory Simulation

Cited by 26 publications

References 33 publications

Study of a Polyamine Inhibitor Used for Shale Water-Based Drilling Fluid

Study of a Polyamine Inhibitor Used for Shale Water-Based Drilling Fluid

Experimental Study on the Polymer/Graphene Oxide Composite as a Fluid Loss Agent for Water-Based Drilling Fluids

High Inhibition of Bentonite Hydration by Use of a Homopolymer Containing Synergistic Bi‐Functional Groups

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