Corrosion Mechanisms of Tubing String of Coalbed Methane Wells in Eastern Gansu

doi:10.11885/j.issn.1674-5086.2018.07.07.01

Abstract

Abstract: The perforation of the oil tubing string caused by the corrosion and the frequent stuck pumps in coalbed methane (CBM) wells are the key factors restricting the development of CBM resources in eastern Gansu. This paper, by using scanning electron microscopy (SEM) and secondary electron image (SE), back scattering (BSE) to characterize the microstructure of corrosion scale and the energy spectrum analysis (EDS) calibration element types and contents of corrosion products, and through X-ray diffraction analysis of component of products, the corrosion mechanisms and protection measures of tubing string of CBM wells were proposed:CO₂ corrosion occurs to N80 steel of CBM Wells in this area in high salinity formation water, Cl^-, HCO₃^-, forming a multilayer structure corrosion scale (FeCO₃). Due to the low bonding strength between the corrosion scale and metal matrix in the wellbore flow, medium scour easily occurs under the stripping, and corrosion scale is porous density, Cl^- contacts the metal matrix to form autocatalytic galvanic corrosion, accelerate the localized anodic dissolution, and to generate a large number of spot corrosion pit, exacerbating the corrosion perforation damage. The selection of 3%Cr oil tubing, corrosion inhibitor (crude oil) and perforation completion is a feasible measure to realize the integral corrosion protection of tubing String of CBM wells in this area.

Key words: coalbed methane wells, N80 tubing steel, CO₂ corrosion, corrosion scale, eastern Gansu

CLC Number:

TE983

CHEN Lichao, WANG Shengwei, ZHANG Diankun, GUO Dingding, REN Longfeng. Corrosion Mechanisms of Tubing String of Coalbed Methane Wells in Eastern Gansu[J]. 西南石油大学学报(自然科学版), 2020, 42(1): 170-180.

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