Research and Practice of Full Life Cycle Well Integrity in HTHP Well, Tarim Oilfield

Liu, Hongtao; Cao, Liyuan; Xie, Jin; Yang, Xiawei; Zeng, Nu; Chen, Fei

doi:10.2523/19403-ms

Cited by 6 publications

(1 citation statement)

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“…The exploitation and production of ultra-deep reservoirs for future energy supply have been highlighted as a practical strategy to achieve the effective application of fossil energy. The Tarim Basin, where exists abundant natural gas in the depth between 6,500-8,000 m, has been constructed with 52 wells in Kuqa from 2012 (Liu et al, 2019a). Due to the high pressure , high temperature (170 °C-190 °C), and complex corrosive medium, the corrosion issues of highly dense brine-based completion fluids on tubing and casing materials in ultra-deep high-temperature wells have become a research hot spot in the course of oil and gas exploitation (Yue et al, 2020a;Li et al, 2020;Zhao et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Formation and Evolution of the Corrosion Scales on Super 13Cr Stainless Steel in a Formate Completion Fluid With Aggressive Substances

Yue

Huang

et al. 2022

Front. Mater.

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The formation and evolution of the corrosion scales on the super 13Cr stainless steel (SS) surface after exposure in a formate completion fluid with the presence of various aggressive substances was investigated. The results indicate that the formation of Fe3O4 covered the surface of super 13Cr SS as the inner layer accompanied with outer scattered FeS. The corrosion rate was below 0.07 mm/year after 120 h of exposure in the formate fluid at 180°C under N2 environments; the presence of aggressive substances such as sulfide and CO2 in the formate fluid promoted the proceeding of anodic dissolution in the early period, and the ingress of CO2 progressively increased the general corrosion rate to 1.7 mm/year. For CO2-containing conditions, the formation of FeCr2O4 and Cr(OH)3 was detected in the inner corrosion product layers, and the precipitation of “sheet”-shaped iron carbonate (FeCO3) was detected as the outer layer. The accumulation rate of corrosion products increases by two orders of magnitude with the ingress of CO2, corresponding to thicker corrosion products, but the dissolution rate is still three orders of magnitude higher than when CO2 was absent.

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Section: Introductionmentioning

confidence: 99%

Formation and Evolution of the Corrosion Scales on Super 13Cr Stainless Steel in a Formate Completion Fluid With Aggressive Substances

Yue

Huang

et al. 2022

Front. Mater.

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Experiment and failure mechanism of cement sheath integrity under development and production conditions based on a mechanical equivalent theory

Huang

et al. 2021

Energy Science & Engineering

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During their life cycle, high-pressure gas wells experience circulating working fluid, acid fracturing, blow off, and other development and production conditions. This may lead to the failure of the cement sheath integrity and result in sustained casing pressure (SCP). Therefore, we explored the failure types and mechanisms of the cement sheath using different wellbore operating procedures. In this study, we used the downhole packer as the demarcation point; the integrity of the cement sheath at the upper and lower parts of the packer was tested through a self-developed wellbore simulation device, which is based on the equivalent theory of cement sheath interface differential pressure. Results showed that the lower part of the single-layer cement sheath underwent compressive strength failure due to the pressure drop in the wellbore before perforation. Plastic deformation of the cement sheath occurred during acid fracturing.In addition, the cooling effect caused by the acid fracturing led to the bonding failure at the cement sheath's second interface. The double-layer cement sheath's inner-layer cement sheath was subjected to tensile failure -attributed to highpressure -and the outer-layer cement sheath maintained its integrity under the pressure changes. Considering the risk factors associated with integrity failure, we propose an engineering optimization plan in the study. The retest results showed that reducing the internal casing pressure and temperature and controlling the annular pressure in the production stage was beneficial in ensuring the integrity of the cement sheath at the lower and upper parts of the packer, respectively. The research results provided an important reference for ensuring the integrity of the cement sheath of high-pressure gas wells.

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Casing Reliability Evaluation of HTHP Wells Via Uncertainty and Stress–Strength Interference Theories

Han,

Dai,

et al. 2024

Iran J Sci

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Research and Practice of Full Life Cycle Well Integrity in HTHP Well, Tarim Oilfield

Cited by 6 publications

References 0 publications

Formation and Evolution of the Corrosion Scales on Super 13Cr Stainless Steel in a Formate Completion Fluid With Aggressive Substances

Formation and Evolution of the Corrosion Scales on Super 13Cr Stainless Steel in a Formate Completion Fluid With Aggressive Substances

Experiment and failure mechanism of cement sheath integrity under development and production conditions based on a mechanical equivalent theory

Casing Reliability Evaluation of HTHP Wells Via Uncertainty and Stress–Strength Interference Theories

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