Study of Deformation Law of Casing Local Lateral Collapse Based on the Principle of Virtual Work

Zhao, Wanchun; Ge, Jason J.; Ranjith, P.G.; Li, Yuwei; Song, Zhenlong; Wang, Tingting

doi:10.3390/en12193717

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…The problem of casing string failure due to collapse or shear exists in many oil and gas fields in a number of countries and can lead to emergencies, premature shut-in of wells and significant economic damage [12]. Ensuring the reliability and durability of casing strings is closely related to their strength calculations.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Casing String Curvature Due to Displacement of Surface Strata

et al. 2022

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One of the main problems of well operation is the risk of uncontrolled leakage of hydrocarbons into the environment. This problem is especially relevant for the long-term operation of wells. The idea for this study was inspired by a real industrial problem that the authors of the article were involved in solving. At several operating gas wells, an abnormal slope of the production tree occurred, which raised the question of the safety of their further operation. An analysis of known studies and current regulatory documents did not allow us to assess the safety of using a gas well based on the measured kinematic parameters of production tree deviations. A mathematical model for the deformation of a package of casing strings when the surface layer of the rock is displaced is developed in the article. A boundary value problem is formulated for differential equations of pipe bending on an elastic foundation. Based on the results of solving this problem, an unambiguous relationship was established between the maximum bending stress in the surface pipe and the angle of inclination of the production tree. The quantitative characteristics of the connection depend on the geometric and mechanical properties of the pipes and on the thickness and mechanical parameters of the formations. It was established that the existing inclination of the production tree can be achieved due to the beginning of the plastic bending of the surface pipe under the slickenside, which does not exclude the exhaustion of the safety margin of the surface pipe and indicates the possible operation of the casing string in a pre-emergency state. In general, the obtained results develop analytical approaches to assessing the behavior of underground structures of a production well in unstable soil bodies.

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Section: Introductionmentioning

confidence: 99%

Mechanism of Casing String Curvature Due to Displacement of Surface Strata

et al. 2022

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“…The technologies are mainly casting thin section, scanning electron microscopy (SEM), transmission electron microscopy (TEM), constant-speed mercury intrusion porosimetry (MIP), micro-nano CT, and unclear magnetic resonance (NMR) [26]. The research on different levels of pores has leaped from 2-D, qualitative to 3-D and quantitative, which provides favorable support for the study of pore characteristics of tight oil and gas reservoirs [4,14,15,[26][27][28][29][30][31][32]. However, all of these techniques have their strengths and limitations.…”

Section: Introductionmentioning

confidence: 99%

Study on Micro-Nano Pore Characteristics and Classification of Tight Sandstone Reservoir Based on Q-Cluster

Zhao

Wang

et al. 2022

Geofluids

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To realize the quantitative classification and comprehensive evaluation of the tight oil reservoir in the 4th of Quantou Formation in Songliao Basin, the pore structure of tight oil reservoir was quantitatively analyzed. In this study, experiments based on the constant-speed mercury injection, nuclear magnetic resonance, and micron CT are based on the observation of cast thin sections, and scanning electron microscope is conducted. The result shows that a tight oil reservoir space is mainly composed of the intergranular dissolved pore, residual intergranular pore, and intragranular dissolve pore. There are few intercrystalline pore and fracture at the same time. The average pore radius is 1.28~4.58 μm, and the average throat radius is 0.52~1.27 μm. Hence, there is a typical micro-nano throat combination with micropores. The pore throat composition and pore structure of reservoirs differ in reservoir with different physical properties. The reservoir quality depends on pore structure especially the throat radius. And the microthroat is a critical factor for permeability. Based on Q-cluster analysis, tight oil reservoirs are classified into three types. The analysis was based on the data such as max throat radius, average throat radius, displacement pressure, median pressure, and permeability. Finally, the reservoirs in the study area are mainly II and I types.

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“…Jeanne et al [1], Schmid et al [2], and Li et al [3] have studied the effects of agricultural production and surface water use on surface subsidence. Rateb and Abotalib [4] analyzed the influencing factors of surface subsidence in the Nile Delta region through satellite systems and GPS systems, and most scholars believe that the downward axial pressure exerted on the casing caused by groundwater exploitation to force the casing to buckle and deform is the main cause of the casing moving up (Yang et al [5]; Cai [6]; Zhao et al [7]; Xue et al [8]). They determined the overall surface settlement law by studying vertical pressure displacements formed by the flow of water in underground rock and soil or coal seams (Jia et al [9]; Pineda and Sheng [10]; Yu et al [11]; Zhang et al [12]; Zhao et al [13]).…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Mechanism and Prevention Method of Casing Moving up: Taking the Jidong Oilfield as an Example

Zhou¹,

Song²,

Zhao

et al. 2022

Geofluids

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In the production process of oilfields, the proportion of oil and water wells scrapped or overhauled by casing moving up continues to increase, especially in some onshore oilfields near the coast, which is more prominent. In order to clarify the causes of casing moving up and propose the treatment method of casing moving up, this paper first establishes the buckling deformation model of groundwater extraction-induced surface settlement and the buckling deformation model of casing on the surface settlement stress field and then combines the relationship between the axial jackal force generated by the buckling deformation of the casing of different well structures and the jacking strength of the casing head to give the criterion for the casting of the casing moving up. Taking Jidong Oilfield as an example, the displacement of running-up wells on 50 casings was analyzed, and the identification compliance rate reached 85.68%, and the variation law of running-up on casing with time and casing structure was given, which provided scientific guidance for subsequent casing running-up protection. Based on the model, it is concluded that enhancing the casing structure, the length of the casing cementing and sealing section, and enhancing the casing prestress are helpful for preventing the casing from moving up.

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Study of Deformation Law of Casing Local Lateral Collapse Based on the Principle of Virtual Work

Cited by 5 publications

References 23 publications

Mechanism of Casing String Curvature Due to Displacement of Surface Strata

Mechanism of Casing String Curvature Due to Displacement of Surface Strata

Study on Micro-Nano Pore Characteristics and Classification of Tight Sandstone Reservoir Based on Q-Cluster

Study on the Mechanical Mechanism and Prevention Method of Casing Moving up: Taking the Jidong Oilfield as an Example

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