Analysis of the causes of tube blocking in Jingbian gas field

• Published in: IOP conference series. Materials Science and Engineering Vol. 542; no. 1; pp. 12072 - 12076
• Main Authors: Ye, Congdan, Gou, Shunchao, Feng, Yuhan, Niu, Buneng, Ma, Yun
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.06.2019
• Subjects: Calcium carbonate; Carbon dioxide; Corrosion; Corrosion effects; Corrosion products; Dissolved oxygen; Gas pipelines; Gas wells; Hydrogen sulfide; Leaching; Natural gas; Scale (corrosion); Water quality; X-ray fluorescence
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/542/1/012072

A large number of blockage appeared in gas wells and pipeline appeared, which caused plugging, corrosion and the increasing of wellbore pressure difference, and seriously affect the normal production of gas well of problems. In this paper, the water quality over the years and natural gas production of the JB1# well in the Jingbian gas field were analyzed, also include the composition of blockage with the chemical volumetric method (CVM), X-Ray Diffraction (XRD) and x-ray fluorescence (XFS) method. Meanwhile, the blockage powder was leached in simulated acid work solution, and then the leaching solution was analyzed with CVM. The experimental results show that the produced water in the JB1# well has unstable water quality, high salinity, high Cl- content, and low pH value, high H2S and CO2 content in natural gas, so easy to produce corrosion and carbonate scaling. The main component of the blockage is a mixture of corrosion product Fe2O3 and a small amount of CaCO3 scale. The corrosion product Fe2O3 is mainly generated by the mixture of dissolved oxygen, H2S, CO2 and other corrosion effects. The main cause of blockage in the JB1# well is the deposition of Fe2O3 and CaCO3 scales caused by the corrosive effects of dissolved oxygen, H2S and CO2.