scholarly journals Junction zone stability in coaxial wells of different diameters (on the example of the Khanty-Mansi Autonomous District oil field)

Georesursy ◽  
2020 ◽  
Vol 22 (3) ◽  
pp. 69-78
Author(s):  
Alexander V. Seryakov ◽  
Maxim Yu. Podberezhny ◽  
Oleg B. Bocharo ◽  
Marat A. Azamatov
Keyword(s):  
Rock Failure ◽  
Oil Field ◽  
Junction Zone ◽  
Drilling Mud ◽  
Rock Destruction ◽  
Coastal Marine ◽  
Deformation Properties ◽  
Different Diameters ◽  
Mud Pressure ◽  
Poroelastic Modeling

The paper considers borehole wall stability in a junction zone of coaxial wells where a borehole of bigger diameter connects with a smaller one. To determine the shapes and character of rock destruction, 3D poroelastic modeling of the stressed state of the rock around the coaxial junction with account for mudcake formation was performed. The geomechanical model considers the anisotropy of the medium’s deformation properties that are characteristic for the coastal-marine reservoirs of Western Siberia. The rock failure is estimated based on the Mohr-Coulomb criterion with account for tensile destruction condition. The paper considers cases of vertical and inclined junctions of a well drilled at a depth of 2 km in sandstone productive pay with known poroelastic anisotropic properties. The stress and pore pressure analysis has been performed for a mud pressure drop range from 1 to 70 atm and coaxial junctions with different combinations of borehole diameters. The safe mud pressure window has been determined for vertical and inclined junctions. It has been found that the rock failure pattern for junction of bigger diameters is, in general, similar to that for smaller diameters with some insignificant differences in the destruction areas shapes. It has also been demonstrated that in vertical junctions, the bottom holes of smaller diameter are more stable to reduced drilling-mud pressure than the mainboreholes, while in the inclined junction it is the mainwellbore that is more stable to increased drilling-mud pressure than the bottom hole.

scholarly journals EXPERIENCE IN CONSTRUCTION OF HORIZONTAL WELLS AT THE KOSHILSKOYE OIL FIELD

2018 ◽  
pp. 34-37
Author(s):  
N. A. Aksenova ◽  
E. Yu. Lipatov ◽  
T. A. Haritonova
Keyword(s):  
Horizontal Wells ◽  
Cost Effective ◽  
Oil Field ◽  
Drilling Mud ◽  
Environmentally Safe

The article presents the experience of drilling horizontal wells at the Koshilskoye oil field in Jurassic sediments (UV1 formation) with application of environmentally safe emulsion drilling mud system BARADRIL-N XP-07 which has proved cost-effective.

scholarly journals Calculation of Pressure Loss of Two Drilling Muds in Noor Oil Field

2020 ◽  
Vol 26 (2) ◽  
pp. 57-69
Author(s):  
Hassan Abdul Ameer ◽  
Hassan Abdul Hadi
Keyword(s):  
Pressure Loss ◽  
Field Data ◽  
Drill String ◽  
Oil Field ◽  
Flow Data ◽  
Drilling Mud ◽  
Pressure Losses ◽  
The Difference ◽  
Drilling Site ◽  
Drilling Muds

    In this work, calculation of pressure losses in circulating system for two drilling muds is evaluated in Noor oil field. Two types of drilling muds that were used for drilling section 12 1/4" and 8 3/4" which are Salt saturated mud and Ferro Chrome Lignosulfonate-Chrome Lignite mud. These calculations are based on field data that were gathered from the drilling site of well Noor-15, which are included, rheological data, flow data and specification of drill string. Based on the obtained results, the best rheological model that fit their data is the Herschel-Bulkley model according to correlation coefficient value for their two drilling mud. Also, the difference between the calculated pressure loss by Herschel-Bulkley model and standpipe pressure value are very convergence.

scholarly journals Development of the drilling mud composition for directional wellbore drilling considering rheological parameters of the fluid

2020 ◽  
Vol 244 ◽  
pp. 454-461
Author(s):  
Nadezhda Ulyasheva ◽  
Ekaterina Leusheva ◽  
Ramil Galishin
Keyword(s):  
Molecular Weight ◽  
Shear Stress ◽  
High Molecular Weight ◽  
Oil Field ◽  
Rheological Parameters ◽  
Dynamic Shear ◽  
Drilling Mud ◽  
High Molecular Weight Polymer ◽  
Molecular Weight Polymer ◽  
Drilling Muds

Article presents investigations on the development of a drilling mud composition for directional wells in an oil field located in the Republic of Tatarstan (Russia). Various rheological models of fluid flow and their applicability for drilling muds are analyzed. Laboratory experiments to measure the main rheological parameters of a solution, such as plastic viscosity, dynamic shear stress, as well as indicators of non-linearity and consistency are presented. On the basis of laboratory investigations, it was concluded that high molecular weight polymer reagents (for example, xanthan gum) can give tangible pseudoplastic properties to the washing fluid, and their combination with a linear high molecular weight polymer (for example, polyacrylamide) reduces the value of dynamic shear stress. Thus, when selecting polymer reagents for treating drilling muds at directional drilling, it is necessary to take into account their structure, molecular weight and properties. Combination of different types of reagents in the composition of the drilling mud can lead to a synergistic effect and increase the efficiency of the drilling process as a whole.

scholarly journals Development of an automated system of control over a drilling mud pressure at the inlet to a well

2020 ◽  
Vol 4 (2 (106)) ◽  
pp. 82-94
Author(s):  
Andrii Lahoida ◽  
Vasyl Boryn ◽  
Georgiy Sementsov ◽  
Vasyl Sheketa
Keyword(s):  
Automated System ◽  
Drilling Mud ◽  
Mud Pressure

Study of ground collapse induced by large-diameter horizontal directional drilling in a sand layer using numerical modeling

2015 ◽  
Vol 52 (10) ◽  
pp. 1562-1574 ◽  
Author(s):  
Biao Shu ◽  
Baosong Ma
Keyword(s):  
Numerical Modeling ◽  
Oil And Gas ◽  
Large Diameter ◽  
Ground Surface ◽  
Soil Parameters ◽  
Directional Drilling ◽  
Drilling Mud ◽  
Horizontal Directional Drilling ◽  
Ground Collapse ◽  
Mud Pressure

With large-diameter horizontal directional drilling (HDD) becoming the preferred method to construct oil and gas pipelines and utility pipelines beneath rivers, the issue of potential ground collapse arises when drilling in loose geological layers such as sand. Ground collapse is a result of borehole collapse and may cause significant damage to the topography and nearby facilities. The present investigation considered the potential causes of ground collapse induced by an actual 1.219 m diameter HDD river-crossing project, using the FLAC3D numerical modeling tool. The analysis showed that the failure zone first developed at the crown of the borehole, resulting in subsequent borehole collapse due to instability of the sand above, and eventually leading to ground collapse. Sequential reaming cycles have been simulated and the results indicate very little effect in comparison with a single reaming cycle. The risk of borehole collapse, and consequent ground collapse, increases with borehole diameter. Parametric numerical modelling has also been conducted to study the influence of soil parameters and drilling mud pressure on the stability of the ground surface above the borehole. The results show that soil cohesion and friction angle have a large influence on stability of the borehole and ground surface, while elastic modulus and Poisson’s ratio have relatively little effect. It was also determined that mud pressure is a very important factor in maintaining stability of the borehole, and therefore the ground surface as well.

scholarly journals Influence of Graphene Nanoplatelet and Silver Nanoparticle on the Rheological Properties of WaterBased Mud †

2018 ◽  
Vol 8 (8) ◽  
pp. 1386 ◽  
Author(s):  
Hazlina Husin ◽  
Khaled Abdalla Elraies ◽  
Hyoung Jin Choi ◽  
Zachary Aman
Keyword(s):  
Rheological Properties ◽  
Silver Nanoparticle ◽  
Drilling Fluid ◽  
Oil Field ◽  
Fluid Loss ◽  
Drilling Mud ◽  
Fluid System ◽  
Graphene Nanoplatelet ◽  
Environmental Friendly ◽  
Water Based

Water-based mud is known as an environmental-friendly drilling fluid system. The formulation of water-based mud is designed to have specific rheological properties under specific oil field conditions. In this study, graphene nanoplatelet and silver nanoparticle (nanosilver) were added to a water-based mud formulation in which they act as drilling mud additives. Rheological properties measurements and filtration tests were conducted for evaluating the influence of the added nanoparticles. The results showed that the graphene nanoplatelet and the nanosilver increased the plastic viscosity (PV) by up to 89.2% and 64.2%, respectively. Meanwhile, both the yield point (YP) and the fluid loss values were reduced. In addition, we believe this is the first result ever report where nanosilver is utilized for enhancing-enhanced water-based mud’s performance.

Bayes Inference for Drilling Mud Pump Piston Life

2013 ◽  
Vol 295-298 ◽  
pp. 3142-3147 ◽  
Author(s):  
Zi Mei Su ◽  
Yong Quan Sun ◽  
Hui Juan Yuan ◽  
Jian Ying Guo
Keyword(s):  
Confidence Limit ◽  
Shape Parameter ◽  
Likelihood Estimation ◽  
Point Estimation ◽  
Oil Field ◽  
Drilling Mud ◽  
Life Distribution ◽  
Bayes Inference ◽  
Daqing Oil Field ◽  
Distribution Parameters

Bayes confidence limit for domestic drilling mud pump piston life was given. Maximum likelihood estimation of mud pump piston life was discussed under Weibull life distribution. For further, failure mechanism of the same batch mud pump piston was studied, the shape parameter of Weibull distribution was considered to be constant. Bayes point estimation and confidence limit of distribution parameters and mud pump piston life were given, according to field life data collected from Daqing oil field, under non-information priori and conjugate prior information for scale parameter. Example shows the effectiveness of the proposed method.

scholarly journals Assessment of the potential ecological and human health risks of heavy metals in Ahvaz oil field, Iran

PLoS ONE ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. e0242703
Author(s):  
Mahmood Reza Ghorbani ◽  
Navid Ghanavati ◽  
Timoor Babaenejad ◽  
Ahad Nazarpour ◽  
Khoshnaz Payandeh
Keyword(s):  
Heavy Metals ◽  
Human Health ◽  
Inductively Coupled Plasma ◽  
Surface Soil ◽  
Principal Component ◽  
Potential Ecological Risk ◽  
Oil Field ◽  
Anthropogenic Sources ◽  
Potential Hazard ◽  
Drilling Mud

The potential hazard to human health from exposure to heavy metals in surface soil was assessed using 66 soil samples collected from Ahvaz oil field. To this end, the contents of heavy metals were measured by the inductively coupled plasma spectroscopy (ICP-OES). Mean levels of As, Cd, Co, Cr, Cu, Ni, Pb, V, and Zn were 5.9, 0.4, 7.1, 36.5, 41.2, 39.8, 67.4, 31.5, and 77.6 mg/kg, respectively. Contents of all studied heavy metals, with the exception of Co, Cr, and V, were several times higher than that of baselines. Correlation coefficients and principal component analysis (PCA) identified two main groups as sources of heavy metals in the surface soil of Ahvaz oil-field. Metals such as Co, Cr, and V were observed to originate from natural sources and As, Cd, Cu, Ni, Pb, and Zn originated from anthropogenic sources such as petroleum leakage and the pollution caused by drilling mud from oil wells. Pb and Zn were of significantly high EF mean enrichment value, and Co, Cu, Cd, and As had high enrichment in surface soil. Pb, Cr, V, Zn, Co, Cu, Ni, and As had a low potential ecological risk (PER) whereas Cd had a moderate PER. The risk of carcinogenic and non-carcinogenic diseases was detected to be higher in children than in adults. The carcinogenic risk (Cr) calculation was more than 1 × 10-6 for children and adults. Additionally, the CR of Cr for both children and adults indicated risk under control conditions.

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