Strain-Based Casing Design for Cyclic-Steam-Stimulation Wells

Han, Lihong; Wang, Hang; Wang, Jianjun; Xie, Bin; Tian, Zhihua; Wu, Xingru

doi:10.2118/180703-pa

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…The casing deformation of shale gas wells in Sichuan area is largely controlled by formation movement, which results in local stress and strain concentration on the casing. This is significantly different from the casing failure of thermal wells because the latter belongs to overall and nearly uniform plastic deformation along the longitudinal direction throughout the whole casing string due to large temperature changes in wellbore [11]. Moreover, the slip of shale formation belongs to random distribution, which is significantly related to well trajectory, fracturing technology and geological migration, and so no one can exactly predict the failure location because of the complexity and randomness of the downhole factors.…”

Section: Status Of Strain Based Casing Designmentioning

confidence: 95%

Requirement of Strain Based Casing Design and Basic Steps for Shale Gas Wells

Han¹

2019

IJESNR

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The failure modes and mechanisms were analyzed aiming at many casings' radial deformation for shale gas wells in Sichuan district of China. It is considered that the casing deformation belongs to strain control mode instead of usual stress mode, where the formation lateral slip was determined as the dominating factor. The usual stress-based casing design was considered insufficient for this environment, and the new strainbased casing design method should be established to assure the casing's adaptivity to slipping formation for shale gas wells. For the new method the limited casing deformation is allowed when the bridge plug can successfully pass during hydrofracture process, which is the basic and the only design principle. Many factors should be evaluated and integrated to achieve quantitative evaluation model including geology feature, wellbore trajectory, cement sheath property, casing material and hydrofracture process. The basic steps for this design was proposed including the quantification of service environment from logging data, determination of casing deforming capability and cement sheath accommodation capability for radial slip from formation and then the final integrated design model could be established to supporting the factual engineering.

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Section: Status Of Strain Based Casing Designmentioning

confidence: 95%

Requirement of Strain Based Casing Design and Basic Steps for Shale Gas Wells

Han¹

2019

IJESNR

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“…The brittle shale formation possesses abundant beddings and fractures, and the shear slip in hydraulic fractures formed during the process of high parameter hydraulic fracturing technology. The shear slip at different positions of fractures is calculated based on given fracture length, angle, friction coefficient and rock mechanics parameters of shale formation [10][11].…”

Section: Formation Slip Induced By High-parameter Hydraulic Fracturin...mentioning

confidence: 99%

Casing Bearing Capacity with Shear Load for Shale Gas Wells

Yang

Wang

Han

et al. 2020

MSF

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Casing radial deformation during complex fracturing process was seriously for shale gas wells in Sichuan district of China, and the average casing deformation rate in the region is of 50%. The bridge plug, perforating gun and other tools cannot successfully pass with deformed casing. Aiming at the 3-D logging morphology for deformed casing of shale gas wells, the failure modes and mechanisms were analyzed by using elasticity and theoretical mechanics. Many factors were evaluated and integrated to achieve quantitative evaluation model including geology feature, wellbore trajectory, cement property, casing material and hydrofracture process. With the aid of the self-developed unconventional oil and gas well casing simulation test equipment, the casing bearing capacity with shear load were carried out, established the relationship between shear load value and radial deformation, and further constructed the casing failure criterion with shear force. This work can provide technical support for casing design and selection in shale gas wells.

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“…However, significant elongation may occur leading casing failure in tension or compression if design do not integrate local loads Yamada et al (2018). Han et al (2018) examined strain-based casing design for cyclic steam stimulation in an oil filed in China and reported 15-30% failure rate. The study concluded that the failure is mainly as a result of extra plastic deformation under tension and compression during thermal cycles.…”

Section: Deformation Regionmentioning

confidence: 99%

“…This is attributed to the geological anomaly of a major fault that traverse across the carbonate oil-field (Asmari 'M') and casing age. In China, 15-30% casing failure in thermal recovery wells were due to substandard casing design according to Han et al (2018). The cyclic steam stimulation (CCS) process in this field adopt three different processes; which are steam injection, soaking and oil production.…”

Section: Introductionmentioning

confidence: 99%

Casing structural integrity and failure modes in a range of well types - A review

Mohammed

Oyeneyin

Atchison

et al. 2019

Journal of Natural Gas Science and Engineering

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This paper focus on factors attributing to casing failure, their failure mechanism and the resulting failure mode. The casing is a critical component in a well and the main mechanical structural barrier element that provide conduits and avenue for oil and gas production over the well lifecycle and beyond. The casings are normally subjected to material degradation, varying local loads, induced stresses during stimulation, natural fractures, slip and shear during their installation and operation leading to different kinds of casing failure modes. The review paper also covers recent developments in casing integrity assessment techniques and their respective limitations.The taxonomy of the major causes and cases of casing failure in different well types is covered. In addition, an overview of casing trend utilisation and failure mix by grades is provided. The trend of casing utilisation in different wells examined show deep-water and shale gas horizontal wells employing higher tensile grades (P110 & Q125) due to their characteristics. Additionally, this review presents casing failure mixed by grades, with P110 recording the highest failure cases owing to its stiffness, high application in injection wells, shale gas, deep-water and high temperature and high temperature (HPHT) wells with high failure probability. A summary of existing tools used for the assessment of well integrity issues and their respective limitations is provided and conclusions drawn.

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Strain-Based Casing Design for Cyclic-Steam-Stimulation Wells

Cited by 8 publications

References 9 publications

Requirement of Strain Based Casing Design and Basic Steps for Shale Gas Wells

Requirement of Strain Based Casing Design and Basic Steps for Shale Gas Wells

Casing Bearing Capacity with Shear Load for Shale Gas Wells

Casing structural integrity and failure modes in a range of well types - A review

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