Stability analysis and trajectory optimization of vertical and deviated boreholes using the extended-Mogi-Coulomb criterion and poly-axial test data

Manshad, Abbas Khaksar; Aghayari, Mostafa; Mahmood, Barham Sabir; Hayavi, Mohammad Tabaeh; Mohammadi, Amir H.; Ali, Jagar A.

doi:10.1016/j.upstre.2021.100052

Cited by 5 publications

(3 citation statements)

References 25 publications

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“…Wellbore instability is one of the most expensive problems in well drilling and construction. 4 The main cause of wellbore instability is thought to be an unfavorable interaction between the shale formation and the drilling fluid. 5 According to Joel et al, 6 shale is responsible for about 90% of wellbore instability problems worldwide.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Nanoinhibitive Drilling Fluid on the Shale Swelling Performance at High Temperature and High Pressure

et al. 2022

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Borehole stability is one of the crucial success elements of the drilling operation, which is partially dependent upon the chemistry of the drilling fluid. Nanoparticles are emerging as one of the most significant additives for improving the major properties of drilling fluids. Thus, SiO2/KCl/xanthan nanocomposites (NCs) was synthesized from Euphorbia condylocarpa extract in an eco-friendly and environmentally friendly way. The synthesized NCs was used to prepare nanoinhibitive drilling fluids (NIDFs) at different concentrations to improve the rheological, filtration, and inhibition properties of the drilling fluid. All of the required experimental tests related to the rheology, filtration, and swelling measurements were performed at the ambient and high temperature and high pressure (HTHP) conditions. The obtaining results revealed that the rheological properties of the drilling fluids (plastic viscosity, yield point, and gel strength) were improved from 4 cP, 10 lb/100 ft2, and 27 lb/100 ft2 to 19 cP, 17 lb/100 ft2, and 46 lb/100 ft2 (with adding 4000 ppm of KCl) and 19 cP, 62 lb/100 ft2, and 54 lb/100 ft2 (with adding 4000 ppm of synthesized NCs), respectively. In addition, the filtration properties of the base drilling fluid were increased by adding 4000 ppm of KCl at HTHP (fluid loss from 25.85 to 36.38 mL and thickness of the filter cake from 3.4 to 5.1 mm), while the synthesized NCs was more effective in lowering the fluid loss and filter cake thickness from 25.85 mL and 3.5 mm to 2.5 mL and 0.33 mm, respectively. Moreover, NIDFs were favorable in decreasing shale swelling that was 52.2%, but conventional inhibitive drilling fluids could lower shale swelling by 41%. It can be stated that NIDFs are highly applicable toward the successful drilling operation as a result of their abilities in reducing shale swelling, improving rheological properties, and decreasing the filtration properties.

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Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Nanoinhibitive Drilling Fluid on the Shale Swelling Performance at High Temperature and High Pressure

et al. 2022

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“…17,18 The subjective factors mainly depend on the disturbance induced by drilling operations, including wellbore trajectory, wellbore pressure, wellbore temperature, drilling fluid chemistry, and drill-string collision. [19][20][21][22][23][24] Currently, many scholars focused on the determination of reasonable wellbore pressure or drilling fluid density, wellbore trajectory optimization, and chemical anti-collapse measure of the drilling fluid. [23][24][25][26] However, regarding the wellbore instability caused by drill-string collision has not been paying enough attention.…”

Section: Introductionmentioning

confidence: 99%

Influence of drill-string lateral collision on wellbore stability of a horizontal well

Huang

et al. 2022

Advances in Mechanical Engineering

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A finite element model of wellbore stability was proposed for a horizontal well, and drill-string friction and lateral collision in the process of rotary motion were taken into account. An unconfined compression test was used for model validation, the normalized yielded zone area (NYZA) was employed to analyze wellbore stability, and the influence of a lateral collision on wellbore stability was simulated. The results indicated that the stress-strain curve of numerical simulation consists with unconfined compression test, and the maximum relative error is <2.2%. The evolution of NYZA can be divided into three typical stages: stage I (static balance), stage II (dynamic growth), and stage III (dynamic balance). Both normal and shear stresses reach to the peak value in stage II, while they always fluctuate in a relatively small range in stage III, so that the wellbore stability mainly affected by the first collision of drill-string. Both lateral acceleration and friction effects have significant impact on wellbore stability. The initial collision position and the size of drilling tool have a certain influence on wellbore stability, while the revolving speed of drill-string almost has no impact. The present paper has guiding significance for wellbore collapse prevention and drilling parameter optimization.

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“…For the problem of low hole formation rates and shallow drilling depths in gas extraction boreholes of cracked soft coal seams, Liu et al [5] created a mechanical model of borehole instability and examined the mechanical process of borehole wall instability. The Mogi-Coulomb criterion and multiaxial test data were utilized by Abbas et al [6] to calculate the collapse and rupture pressures needed to stabilize the wellbore under various borehole trajectories and ground stress states. Wu and colleagues [7,8] performed compression studies on sandstone specimens with circular holes and found that the holes weakened the rock specimens and changed the damage pattern with DIC and AE techniques.…”

Section: Introductionmentioning

confidence: 99%

Crack Propagation and AE/EMR Response Characteristics of Pre-Holed Coal Specimens under Uniaxial Compression

Feng

Ding

et al. 2022

Sustainability

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Drainage boreholes in soft coal seams are prone to deformation and failure under the action of in situ stress and mining stress, which has a significant impact on gas drainage in coal mines. To simulate the development and propagation of cracks around the shaft wall caused by in situ stress, the crack propagation of coals with different diameters and strengths during the failure process, and the acoustic emission (AE) and electromagnetic radiation (EMR) law and response characteristics are explored. The results show that: The failure process of coal with pores is divided into four stages: initial compaction stage (OA), elastic deformation stage (AB), yield deformation stage (BC), and macroscopic crack development stage (CD). The crack propagation develops significantly in the post-load peak stage, the coal body damage is aggravated, and the coal body is unstable and fractured. For the pre-holed coal specimens with the same diameter, as the coal becomes softer, the peak stress decreases significantly (from 15.73 to 10.05 MPa). The cumulative value of AE counts of hard coal samples increased from 2.3 × 105 to 3.6 × 105 with increasing diameters. The Digital Image Correlation system (DIC) strain cloud diagram found that there are ‘I’-type cracks around the axial direction of the prefabricated holes. Coal samples with smaller hole have shorter cracks, indicating that the diameter of the holes significantly changes the axial loading limit. The research results have a certain reference significance for understanding the crack propagation of coal under static loads and evaluating the deformation characteristic and spatiotemporal stability of gas drainage in soft coal seams.

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Stability analysis and trajectory optimization of vertical and deviated boreholes using the extended-Mogi-Coulomb criterion and poly-axial test data

Cited by 5 publications

References 25 publications

Synergistic Effect of Nanoinhibitive Drilling Fluid on the Shale Swelling Performance at High Temperature and High Pressure

Synergistic Effect of Nanoinhibitive Drilling Fluid on the Shale Swelling Performance at High Temperature and High Pressure

Influence of drill-string lateral collision on wellbore stability of a horizontal well

Crack Propagation and AE/EMR Response Characteristics of Pre-Holed Coal Specimens under Uniaxial Compression

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