Environment Cracking and Surface Protection of C110 Casing in Sour and Deep Well

doi:10.11885/j.issn.16745086.2021.04.28.06

Abstract

Abstract: The casing served in deep and ultra-deep wells with complex geological characteristics, well trajectory and high temperature, high pressure and containing H₂S, bears severe wear, corrosion, fracture and other failure risk, frequent environment sensitive cracking occurs to C110 casing when in corrosive environment and high level tensile stress. The slow strain rate test (SSRT) was used to study the environmental cracking behavior of C110 casing plated with Ni-W alloy in the simulated gas field formation water, and the protective effects of Ni-W alloy coating on C110 casing against environment sensitive cracking. The results show that the C110 casing has high sensitivity of SCC in the simulated formation water, risk of environmental cracking exists even if the corrosion rate is low, and it is characteristic of brittle fracture under the action of slow strain rate tensile test. The tensile strength and yield strength of C110 casing after Ni-W alloy surface were increased by 2.3% and 6.3%; after Ni-W alloy coating were heated, the tensile strength, yield strength, elongation and strain energy of C110 casing in simulated formation water increased significantly, the SCC sensitivity is reduced, and the fracture mode is changed into ductile brittle mixed fracture. The phenomena indicates that the Ni-W alloy coating of C110 casing and heat treatment can effectively reduce the risk of corrosion, cracking and damage of C110 casing, significantly improve its ability to resist environmental cracking and applicability in deep and ultra-deep wells.

Key words: deep well, casing, corrosion, environment cracking, Ni-W alloy coating

CLC Number:

TE245

DENG Hu, LI Yufei, ZHANG Zhi, LU Qi, HOU Duo. Environment Cracking and Surface Protection of C110 Casing in Sour and Deep Well[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 118-128.

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