Polymer-cement geothermal-well-completion materials. Final report

Zeldin, A.; Kukacka, L.E.

doi:10.2172/6564057

Cited by 11 publications

(2 citation statements)

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“…Due to the low ductility, they are prone to cracking under low tensile strains, typically between 10 −4 and 10 −3 [ 1 ]. The cracks weaken the structural-bearing capacity and overall stability and limit the application scope of cementitious materials [ 4 , 5 ]. With the rapid development of the social economy and complexity of the building structure, growing demand for high-toughness inorganic cementitious materials has been raised.…”

Section: Introductionmentioning

confidence: 99%

Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix

Xing

Wei

et al. 2022

Polymers

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In this work, two series of chemically reactive polymers, silane coupling agents (SCAs) and water-soluble polymers, were specifically designed as an additive to improve the ductility of slag geopolymer paste by vibration pressure technique. The influences of organic polymers on the fluidity, rheological behavior, mechanical property, porosity, and toughening mechanism of slag geopolymer were investigated. The polycondensation and bonding characteristics of organic–inorganic products were calculated by 1H liquid nuclear magnetic resonance (NMR) technology and Fourier transform infrared (FT-IR). The polymerization degree of composite geopolymer was evaluated by 29Si NMR and X-ray photoelectron spectroscopy (XPS). The microscopic morphology of the geopolymer matrix was analyzed using scanning electron microscopy (SEM). The results showed that the dosage of the KH570 and PAA-Na with 5 wt% behaved best in improving the flexural strength and the compressive strength of geopolymer in their corresponding organic series, respectively. The addition of polymers decreased the fluidity and the fluidity loss ratio of geopolymer slurry but reduced the harmful pores of hardened geopolymer. The organic polymers acting as bridge-fixed water molecules weakened the repulsion force, and formed a three-dimensional network through molecular interweaving in a geopolymer matrix. Methacryloxy in silane coupling agents and carboxyl group in water-soluble polymers may contribute to the improvement of hydration product structure through strong bonding with C-A-S-H. Microscopic measurements indicated that the addition of KH570 and PAA-Na in geopolymer could form 73.55% and 72.48% Si-O-Si with C-A-S-H gel, higher than the reference, and increase the polycondensation degree of C-A-S-H phase, reflected by the increased generation of Q2 and Q2(1Al) and the longer chain length, leading to a higher densified geopolymer matrix with high ductility.

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Section: Introductionmentioning

confidence: 99%

Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix

Xing

Wei

et al. 2022

Polymers

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“…Decrease of silica, proposed as a measure to improve resistance of Portland cement-silica blends to carbonate, produces weaker cement but allows calcium hydroxide formed at low silica content to react with carbonate and form a dense protective layer that slows down cement degradation [8][9][10]. Various organically-modified Portland-based systems or "synthetic cements" have been proposed for the use in aggressive geothermal environments but their applications are limited by polymers high temperature stabilities [11][12][13]. To address the difficulties of cementing geothermal wells oil well cements modified with alumina [14] and alternative, calcium-aluminate-cement (CAC) based systems were studied and developed specifically for geothermal well applications [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Cements for High-Temperature Geothermal Wells

Pyatina¹,

Sugama²

2018

Cement Based Materials

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Geothermal environments are among the most difficult conditions for cements to survive. Normally accepted for high-temperature oil wells silica-modified Portland-based cement formulations are not durable in hostile geothermal environments failing to provide good zonal isolation and metal casing corrosion-protection. High-temperature well cement compositions based on calcium-aluminate cements have been designed to seal such wells. Two types of calcium-aluminate cement are of particular interest for geothermal applications. One is-chemical type, calcium-aluminate-phosphate cement (CaP) already used in the field and the other, alkali-activated calcium-aluminate type (thermal shock resistant cement, (TSRC), has been recently developed. The CaP cements were designed as CO 2-resistant cements for use in mildly acidic (pH ~ 5.0) CO 2-rich downhole environments. TSRC was formulated to withstand dry-heat-cold water cycles of more than 500°C. This chapter includes information and discussions of cement forming mechanisms, cements mechanical properties, resistance to mild and strong acids, cementcarbon steel bonding and self-recovery of mechanical strength and fractures closure after imposed damage. Performance of common high-temperature OPC-based composites is discussed for comparison.

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Geothermal Resources, Drilling for

Finger¹

2012

Encyclopedia of Sustainability Science and Technology

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EXAMPLES OF. THE LEARNING CURVE EFFECT The geothe~l industry has been slow'in developing hyd~othe~mal resou~ces fo~ a variety of reasons. These include institutional barriers, ma~ginal economies and technical uncertainties. Conservative investo~s and utilities have been reluctant to proceed until perceived problems are resolved and solutions are demonstrated. This paper argues that the industry is in fact on a learning curve and that significant advances in knowledge, technology and economics will be made as projects move forward. The learning cu~ve concept is illustrated with actual examples taken f~om Republic's ea~ly development experience in the East Mesa field and its related engineering design of a flashed steam power plant.

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Polymer-cement geothermal-well-completion materials. Final report

Cited by 11 publications

References 0 publications

Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix

Effect of Organic Polymers on Mechanical Property and Toughening Mechanism of Slag Geopolymer Matrix

Cements for High-Temperature Geothermal Wells

Geothermal Resources, Drilling for

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