Study on Source Analysis of the Cation in Produced Water from Sulige Gas Field and Anti-Scaling Measures

Abstract:

A large amount of foreign matter appears in the Sulige gas well, causing blockage and corrosion of the pipeline, increasing the pressure difference in the wellbore and seriously affecting the normal production of the gas well. The gas wells with serious conditions mentioned above were selected to analyze the quality of single well produced water and the composition of blockage and core. Combined with the XRD analysis results of the cuttings, the long-term leaching experiments on the cuttings in different simulated solutions were carried out to study the sources of scaled ions in the gas wells. The experimental results showed that the extracted water from SD6-1 had high salinity and high content of scale ions Ca²⁺, Ba²⁺ and Sr²⁺;the main component of blockage is the acid insoluble strontium sulfate (barium) scale, and contains a small amount of corrosion products. The easily scalable Ca²⁺、Mg²⁺、Ba²⁺ and Sr²⁺ produced from the dissolution of the core in the formation water or working fluids, especially the acid erosion dissolves. According to the scaling mechanism, two kinds of Sr/Ba scale inhibitor were selected. The results showed that the barium II scale inhibitor performance is relatively good, and at the concentration of 40 mg/L, and the scale inhibition rate was more than 95%. The clogging of a single well can be reduced by adding a scale inhibitor.

• Periodical: Key Engineering Materials (Volume 814)
• Pages: 505-510
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.814.505
• Online since: July 2019
• Authors: Peng Chang, Rui Xue Shi, Li Wang, Wei Han, Cong Dan Ye, Yun Ma*
• Keywords: Clogging, Scale Inhibitor, Scale Ion Source, X-Ray Diffraction Crystal Phase (XRD) Analysis

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