Sealing failure mechanism and control method for cement sheath in HPHT gas wells

Lian, Wei; Li, Jun; Xü, Dong; Lu, Zongyu; Ren, Kai; Wang, Xuegang; Chen, Sen

doi:10.1016/j.egyr.2023.02.048

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…Lian et al 106 selected critical positions along the entire wellbore to focus on the cement sheath, constructing a stress and temperature coupled finite element model for the casing-cement sheath-formation system. The study investigated the stress state and integrity of B-annular cement sheath and analyzed the maximum production and wellhead pressure based on cement sheath integrity constraints.…”

Section: Numerical Simulation Of Casing-cement Sheath-formation Systemmentioning

confidence: 99%

Analytical Perspectives on Cement Sheath Integrity: A Comprehensive Review of Theoretical Research

Wu,

Li,

Hou

et al. 2024

ACS Omega

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The cement sheath, serving as the primary element of well barriers, plays a crucial role in maintaining zonal isolation, protecting the casing from corrosion, and providing mechanical support. As the petroleum industry shifts from conventional to deep unconventional resources, the service environment for cement sheaths has become increasingly complex. High temperatures, high pressures, cyclic loading, and thermal stresses in downhole conditions have significantly increased the risk of cement sheath failure. A growing trend toward theoretical analysis of stress distribution, failure modes, and control mechanisms within the casing-cement sheath-formation system is evident. This paper comprehensively reviews theoretical research on cement sheath integrity from four key perspectives: (1) the concept of cement sheath integrity failure, (2) cement sheath constitutive models, (3) analytical models of the cement sheath-casing-formation system, and (4) numerical simulations of the cement sheath-casing-formation system. Through these discussions, this review provides profound insights into cement sheath integrity failure and offers valuable guidance for future research and practices.

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Section: Numerical Simulation Of Casing-cement Sheath-formation Systemmentioning

confidence: 99%

Analytical Perspectives on Cement Sheath Integrity: A Comprehensive Review of Theoretical Research

Wu,

Li,

Hou

et al. 2024

ACS Omega

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show abstract

“…Due to a long period of water injection development, the high water production rate has hampered the development of the oil and gas industries in recent years. − The oil and gas reservoirs formed the high-permeability regions after the long-term injection of water, resulting in the lower mechanical energy utilization rate of the injected water and oil and gas production rate. , Moreover, other reasons that caused the high water production rate included cement sheath failure and channeling flow outside the horizontal well tube. − Globally, the annual water production rate of oil and gas reservoirs increased each year, which considerably restricted the stabilization and increase in oil field production. About 3–4 tons of water was produced per ton of oil produced, and old oil fields produced more water.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Low-Viscosity Epoxy Resin Sealing Agent and Evaluation of Injection, Plugging, and Degradation Properties

Chen,

Li,

Peng

et al. 2024

ACS Omega

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The technology of water plugging and increasing production in high water cut reservoirs of low permeability is a common problem in the industry. Epoxy resin, displaying excellent mechanical properties and adherent performance, can easily inject a tiny crack, forming a long-term blocking barrier. This study aimed to investigate an easily injectable degradable epoxy resin sealing material. The injectable performance, longterm stability, and mechanical and plugging properties were comparatively analyzed in the fractured core, and the degradable performance was discussed in the degrading solution. The result showed that the range of R (R is the ratio of EOG and MHHPA) from 1 to 1.1 and the mass fraction range of EMI from 0.01 to 4 wt % are the optimal formulations (EOGM). The curing time from 1 to 12 h could be regulated by adjusting the dosage of EMI, as well as the strength being more than 60 MPa. The plugging agent's initial viscosity is lower than 100 MPa s at 20 °C and injecting pressure is lower than 0.1 MPa. After curing for 24 h, compressive strength was more than 72.76 MPa, 3.6 times higher than that of cement, and the adhesion strength was 4.41 MPa when the contact area was 75.93 cm 3 . Breakthrough pressures for sealing 1−5 mm fractures were all more than 10 MPa, and the breakthrough pressure for 1 mm crack even reached 29.4 MPa. Epoxy resin/acid anhydride system could be degraded in a mixed solution of phenol−potassium salt−heavy aromatics within 7 days at 60−100 °C, which reduced the plugging well risk of the epoxy resin plugging agent. These results suggest that an epoxy resin/acid anhydride plugging agent can be employed effectively and safely for the injection of tiny cracks, which is of great engineering significance.

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Development of rheological models depending on the time, temperature, and pressure of wellbore cement compositions: a case study of southern Iran’s exploratory oilfields

Saffari,

Ameri,

Jahangiri

et al. 2024

Arab J Geosci

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Sealing failure mechanism and control method for cement sheath in HPHT gas wells

Cited by 5 publications

References 34 publications

Analytical Perspectives on Cement Sheath Integrity: A Comprehensive Review of Theoretical Research

Analytical Perspectives on Cement Sheath Integrity: A Comprehensive Review of Theoretical Research

Preparation of Low-Viscosity Epoxy Resin Sealing Agent and Evaluation of Injection, Plugging, and Degradation Properties

Development of rheological models depending on the time, temperature, and pressure of wellbore cement compositions: a case study of southern Iran’s exploratory oilfields

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