A chelating agent system for the removal of barium sulfate scale
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ORIGINAL PAPER - PRODUCTION ENGINEERING
A chelating agent system for the removal of barium sulfate scale Zhifeng Luo1 · Nanlin Zhang1 · Liqiang Zhao1 · Chunlei Wang2 · Lin Wu1 · Pingli Liu1 · Hongyu Ji1 Received: 15 October 2019 / Accepted: 8 April 2020 © The Author(s) 2020
Abstract This study aimed to prepare a chelating agent SA-20 using diethylenetriaminepentaacetic acid (DTPA) and low molecular weight sodium polyacrylate raw material for the removal of barium sulfate ( BaSO4) scale. The morphology of the resulting chelating agent was characterized by scanning electron microscopy. The BaSO4 scale removal ability of SA-20 was comprehensively evaluated by the dissolving ability, particle size analysis, corrosion performance, and fracture conductivity before and after the scale removal. The results showed that the SA-20 has a good B aSO4 scale removal ability due to the chelation, lattice distortion, and dispersion of DTPA and low molecular weight sodium polyacrylate. Keywords Chelating agent · Corrosion ability · Dissolving ability · DTPA · Particle size analysis · Sodium polyacrylate
Introduction With the development of the global oil and gas industry, higher requirements are put forward for drilling and stimulation (Luo et al. 2019). Barite, whose main constituent was barium sulfate ( BaSO4), was usually added into a drilling fluid as a weighting material to increase the fluid density of a drilling fluid (Elshreef and Lashin 2016; Fang et al. 2018; Nguyen et al. 2011; Srungavarapu et al. 2018). During drilling, most drilling fluid was lost and entered the reservoir, and solid particles, such as BaSO4, were deposited in the reservoir, resulting in the damage of the reservoir (Al-Yami et al. 2010; Bozau et al. 2015; Liu et al. 2017; Mozaffari et al. 2015, 2017b; Shahbazi et al. 2006). Thus, it is important to develop a chelating system for the removal of the BaSO4 scale. At present, the development of the chelating agent mainly focused on a slightly soluble sulfate scale–dissolving agent (Egermann et al. 2002). Scale-removing agents
* Nanlin Zhang [email protected] * Liqiang Zhao [email protected] 1
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
Downhole Operation Department of Natural Gas Business Department, Petrochina Tarim Oilfield Company, Korla 841000, Xinjiang, China
2
usually had a compound formula composed of an organic complexing agent (Balanyà et al. 2018), scale inhibitor (Yan et al. 2015; Zhang et al. 2016), surface surfactant (Ratkievicius et al. 2016), and so on. Recently, the study of scaleremoving agents focused on aminocarboxylate chelating agent (Uchida et al. 2001). This agent is a kind of carboxylic acid derivative with the main body of aminocarboxylic acid. It could form a stable and water-soluble chelating product easily with many metal ions and thus was widely used for the chemical treatment of slightly soluble scale, which mostly contained salts of Ca, Mg, Ba, and S (Shaw and Sorbie 201
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