A modified method for predicting the stresses around producing boreholes in an isotropic in-situ stress field

Hassani, Amirhossein; Veyskarami, Maziar; Al-Ajmi, A.; Masihi, Mohsen

doi:10.1016/j.ijrmms.2017.02.011

Cited by 13 publications

(7 citation statements)

References 20 publications

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“…12) (Zoback et al, 2003;Tingay et al, 2009;Ju et al, 2017;Lai et al, 2019). The vertical stress is caused by the gravity of overburden rocks (Hassani et al, 2017;Lai et al, 2019). The magnitude of Sv at a certain depth equals to the weight of overburden rocks, and it can be calculated by Eq.…”

Section: In Situ Stress Magnitudesmentioning

confidence: 99%

Structural diagenesis in ultra-deep tight sandstones in Kuqa depression, Tarim Basin, China

Lai

Liu

et al. 2021

Preprint

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Abstract. The Lower Cretaceous Bashijiqike Formation of Kuqa depression is ultra-deeply buried sandstone in fold-and-thrust belts. Few researches link diagenetic processes with structure. To fill this gap, a comprehensive analysis integrating diagenesis with structure pattern, fracture and in situ stress is performed following a structural diagenetic approach. The results show that the pore spaces include residual intergranular pores, intergranular and intragranular dissolution pores, and micro-fractures. The sandstones experienced a high degree of mechanical compaction, and compaction is limited in well-sorted rocks or abundant in rigid quartz grains. The most volumetrically important diagenetic minerals are calcites. The framework grains experienced a varied degree of dissolution, and intergranular and intragranular dissolution pores are formed. Special aims are paid on the dissolution associated with the fracture planes. Most natural fractures are cemented by carbonate cements, which limit fluid flow. In addition, presences of fracture enhance dissolution, and the fracture planes are enlarged by dissolution. Cementation and dissolution can occur simultaneously in fracture surfaces, and the enlarged fracture surfaces can be cemented by late-stage cements. The in situ stress magnitudes are calculated using well logs. The horizontal stress difference (Δσ) determines the degree of mechanical compaction, and rocks associated with low Δσ experienced a low degree of compaction, and there contain preserved intergranular pores. Natural fractures are mainly related to the low Δσ layers. The presences of intergranular and intragranular dissolution pores are mainly associated with the fractured zones. The high quality reservoirs with intergranular pores or fractures are related to low Δσ layers. The structural diagenesis researches above help the prediction of reservoir quality in ultra-deep sandstones, and reduce the uncertainty in deep natural gas exploration in Kuqa depression.

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Section: In Situ Stress Magnitudesmentioning

confidence: 99%

Structural diagenesis in ultra-deep tight sandstones in Kuqa depression, Tarim Basin, China

Lai

Liu

et al. 2021

Preprint

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“…Here ; the angle r between R and F; The distance of the force from the axis of rotation (m) is F; The applied force (N) is , Torque (SI): Nm. When a material is subjected to a tensile load along a single axis, the relationship between stress and strain occurring in the material is determined by Hooke's Law [17,18] which is given in Equation 2.…”

Section: = (1)mentioning

confidence: 99%

Electrical-Thermal-Mechanical Analysis of Cable Connection with Screw-Connected Terminal Strips Using Finite Element Method

Tosun

Aksoy

2021

Sakarya University Journal of Computer and Information Sciences

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Electric energy passes through many stages from production to usage, and many electrical connections take place at these stages. Electrical connections are quite important for system safety and electrical energy quality. In this study, current-temperature relationship in the cable was investigated in cable joints made with screw connection terminals, depending on torque applied to screw. In numerical solution of the problem, Comsol Multiphysics program based on Finite Element Method was used first, the screw-conductor interface was investigated based on applied torque, and then electrical-thermal analysis was performed on this geometry. Experimental studies were carried out to demonstrate accuracy of digital model, and conductors and terminals used in household installations were taken into account in these studies. Amount of deformation of conductors depending on torque applied to screw and its effect to current carrying capacity of these terminals having screw connection were investigated. In this study, the appropriate torque value is 0.4 Nm, and the maximum temperature value is 45 o C on contact surface. Also, it has been shown that the optimum torque value to be applied in the copper conductor cable joint with 1.5 mm 2 cross section area is 0.4 Nm.

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“…Increase in fluid production rate is facilitated by reducing bottom hole pressure and in the longer term could result in the two-phase flow (Feng et al 2012;Li et al 2011), water coning, condensate accumulation near-wellbore (Jin et al 2016;Fahes and Firoozabadi 2007;Tang and Firoozabadi 2003), etc. Consequently, sand production from oil and gas reservoirs will be worsen because of increasing drag force and in situ stress (Talaghat et al 2009;Ojha 2015, 2016a;Hassani et al 2017). Sand (or fine) production in oil and gas wells connected with unconsolidated or partially consolidated reservoir rocks consults to the phenomenon in which sand particles are migrated from reservoir to the wellbore by fluids flow during well production.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive research in chemical consolidator/stabilizer agents on sand production control

Tabar¹,

Bagherzadeh²,

Shahrabadi³

et al. 2021

J Petrol Explor Prod Technol

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Sand or fine is a typical product in many processing of oil production from unconsolidated and weakly consolidated formations. High variation of in situ stress, fluid production rate above maximum sand-free rate, and water production are main primary sources of the sand production. Sand production can cause hazardous operational problems to the facilities, pipes, and wellbore. Hence, it is a significant problem that requires to be managed and studied. To minimize the operational impacts of particle migration, chemical consolidators/stabilizers can be utilized to alter surface properties of sand and formation particles. The decreasing zeta potential besides increasing the cohesion between sand and formation particles could result in controlled sand production. However, understanding the mechanism and application of chemical methods to alleviate sand production is not well-discussed. This study presents and discusses chemical consolidator/stabilizer agents, which may be applied for managing sand production in the petroleum industry. This was achieved through a comprehension review of the literature and the application of chemical consolidators/stabilizers in other fields such as bauxite residue (red mud and red sand) control, desert sand, mine reclamation, wind erosion control, unpaved road modification, and enhancement of water retention and soil infiltration properties that are similar to formation sand. Standard experimental methods in various fields, for performance analysis of chemical consolidator/stabilizer agents, are compared and summarized. The consolidation/stabilization mechanisms of various types of chemical consolidator/stabilizer agents are discussed and compared. This review potentially can be used to inhibit blind usage of chemicals and functions as a reference to additional research in sand production control in petroleum engineering. The results are appropriate for extending quantitative approaches for performance evaluation of sand consolidator/stabilizer agents.

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A modified method for predicting the stresses around producing boreholes in an isotropic in-situ stress field

Cited by 13 publications

References 20 publications

Structural diagenesis in ultra-deep tight sandstones in Kuqa depression, Tarim Basin, China

Structural diagenesis in ultra-deep tight sandstones in Kuqa depression, Tarim Basin, China

Electrical-Thermal-Mechanical Analysis of Cable Connection with Screw-Connected Terminal Strips Using Finite Element Method

A comprehensive research in chemical consolidator/stabilizer agents on sand production control

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