A study on casing deformation failure during multi-stage hydraulic fracturing for the stimulated reservoir volume of horizontal shale wells

Lian, Zhanghua; Yu, Haibin; Lin, Tingyu; Guo, Jianchun

doi:10.1016/j.jngse.2015.02.028

Cited by 100 publications

(46 citation statements)

References 6 publications

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“…During the stimulation of shale reservoirs, the hydraulic fractures communicate the beddings and natural fractures in the formation to form a complex fracture network [6,7]. The formation of such network in the formation will decrease the integrated Young's Modulus.…”

Section: Resultsmentioning

confidence: 99%

The New Method to Analysis the Influence of Trapped Pressure on Casing Stress in Multi-stage Fracturing of Shale Gas

Fan¹,

Li²,

Liu³

et al. 2017

dtetr

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Abstract. Currently, most of the shale gas development in China's Sichuan region adopts the large-displacement staged fracturing technology. Some of the shale gas wells undergo casing deformation during stimulation of the reservoir, where the trapped pressure of cementing section has a non-negligible effect on the casing stress in the multi-stage fracturing process. To this end, this paper constructs a finite element model of casing-cement sheath-formation assemblage under shale anisotropy based on the step-by-step finite element method by taking into account the whole construction process of drilling, completion and fracturing, in order to analyze the effect of trapped pressure on the casing stress under varying missing degrees, temperature field variations and cement sheath-formation property variations of cementing section in the multi-stage fracturing process. The results show that: 1) the larger the temperature drop in the wellbore during fracturing, the greater the effect of trapped pressure on casing stress during instantaneous pumping termination. 2) The smaller the missing degree of cementing section, the greater the effect of trapped pressure on casing stress under variations of cement sheath and formation. Therefore, optimization of cementing quality and reasonable optimization of relevant fracturing operation parameters are necessary in the future shale gas fracturing stimulation, so as to ensure the normal proceeding of subsequent well completion works.

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Section: Resultsmentioning

confidence: 99%

The New Method to Analysis the Influence of Trapped Pressure on Casing Stress in Multi-stage Fracturing of Shale Gas

Fan¹,

Li²,

Liu³

et al. 2017

dtetr

View full text Add to dashboard Cite

show abstract

“…During the fracturing process of shale reservoirs, the fracturing fluid is pumped into the formation, and the local in-situ stress field around the wellbore can be altered by fluid injection in fracturing operations of adjacent wells [14]. Figure 9 presents the influence of in-situ stress variation on the cement sheath hoop stress under the two models.…”

Section: Effect Of In-situ Stress On the Stress Of Perforated Casingmentioning

confidence: 99%

New Method to Analyse the Cement Sheath Integrity During the Volume Fracturing of Shale Gas

Fan

Liu

2018

Energies

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Accurate prediction of the hoop stress distribution of the cement sheath and its variation regularities during volume hydraulic fracturing in shale formations is of great significance for maintaining the wellbore integrity of shale gas horizontal wells. A finite element model of casing-cement sheath-formation system (CCFS) coupling between stresses and temperature was established through a staged finite element method based on the elastic anisotropy of shale. With this new model, the effects of operation parameters and formation mechanical property changes on the cement sheath hoop stress during the multi-stage hydraulic fracturing process were analyzed, and the results were compared with the conventional model. The results revealed that the increase of the temperature of the fracturing fluid could reduce the hoop stress of the cement sheath, which decreased gradually with the decreasing elastic modulus of the cement sheath, and eventually changed to compressive stress from tensile stress. The hoop tensile stress of the cement sheath increases first and then tends to decrease with the increasing internal casing pressure, the larger the local formation stress, the smaller the pore pressure and the smaller the hoop tensile stress of the cement sheath it preforms. The findings of this paper are of great guiding significance to the research of the cement sheath stress variations during volume fracturing in shale formations and to the optimization of fracturing design.

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“…After a period of waterflood development in oil fields, a variety of casing damage will occur, such as squashing, diameter reduction and staggered sections. However, in some oilfields, such as Daqing, Jilin, Xinjiang, Belridge, Lost Hills, and Samotlor, casing collapse caused by water injection accounts for about 70% of the all casing collapses [1][2][3][4][5][6][7]. The causes of casing damage are very complicated, but the root cause is that the external load on the casing under the action of crustal stress exceeds the external load strength of the casing.…”

Section: Introductionmentioning

confidence: 99%

An Approach to Calculating Casing Bearing Capacity with Parabolic Deformation Characteristics Under Local Radial Loading

Zhao

Ranjith

et al. 2020

Energies

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In the process of waterflooding technology in the Jilin oilfield, local radial compressive stress caused by rock deformation results in local casing collapse. According to statistics regarding casing-deformation characteristics, a certain number of these characteristics are approximately parabola-shaped at the radial-deformation bottom, and the boundary of the whole deformation area is approximately symmetrical and double-parabola-shaped. The main work of this article focused on occurrences of such casing deformation. Assuming that, in the process of casing deformation, external work is totally converted into energy consumption due to the deformation, the variation regularity of bearing capacity under local radial load was obtained. In the Qing-1 stratum of the Jilin oilfield, by selecting casing with radial collapse deformation parameters of 41/2"J 55 , 51/2"J 55 , 41/2"N 80 , and 51/2"N 80 , radial bearing capacity was calculated. Study results showed that the casing bearing-capacity value was reduced by 39.69% compared with the current API 5C3 standard when under the action of a local radial load. The casing collapsed due to the impact of local radial loads produced by mudstone creep. A series of relationships between radial bearing strength and casing parameters were also obtained. The research results are of significant academic value for the compilation of casing design codes or standards under local radial loading.Energies 2020, 13, 1769 2 of 16 deformation. Therefore, casing strength design is an opportunity for researchers to prevent casing failure. In the 1940s, scholars of the Soviet Union ГИНИ(Булгaкoв, 1930) and Г.М.Caркисo developed a casing strength design; then, in the early 1980s, ищенкo established the mechanical model of the casing wall under heterogeneous load. By means of stress superposition, the theoretical formula of stress change in casing was obtained [8]. Since then, the strength-design standard represented by the American Petroleum Association (API) has been widely used in many countries. At present, the API 5C3 and ISO 10400 standards [9,10] are used as the design standards of casing strength in the petroleum industry, but most of those standards are based on calculated results under uniform and non-uniform loads [11][12][13][14][15][16]. By using the lead-mold method to determine the casing-deformation characteristics of the Jilin oilfield, it was found that the casing deformation was due to local radial deformation, as shown in Figure 1 [17]. Previous studies [18,19] have found that casing deformation is mainly manifested as axial extrusion deformation and shear deformation. Axial compression failure occurs at the production stage, while axial shear failure occurs at the edge of the collapse area. Many scholars [20][21][22][23][24][25][26][27] have found that the main reason for local radial casing deformation is the lateral extrusion formed by water-absorption mudstone expansion. The finite element analysis is applied to establish the shape of casing deformation characteristics. Re...

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A study on casing deformation failure during multi-stage hydraulic fracturing for the stimulated reservoir volume of horizontal shale wells

Cited by 100 publications

References 6 publications

The New Method to Analysis the Influence of Trapped Pressure on Casing Stress in Multi-stage Fracturing of Shale Gas

The New Method to Analysis the Influence of Trapped Pressure on Casing Stress in Multi-stage Fracturing of Shale Gas

New Method to Analyse the Cement Sheath Integrity During the Volume Fracturing of Shale Gas

An Approach to Calculating Casing Bearing Capacity with Parabolic Deformation Characteristics Under Local Radial Loading

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