A Derivation of Drilling Fluid Modeling for PR # 2 Well (KG Basin - India) in Terms of Geo-pressure Gradient and Geo-mechanical Stress for Extra Well - bore Stability of its over pressured Highly Reactive - Water Sensitive Shale column of 1225 Mtrs in 8 - B= inch bore - hole from 2883 Mtrs to 4108 Mtrs TVD. - - A critical Analysis of Shear Failure Pressure and Chemical Osmosis during Fluid - Shale

2010 ◽  
Author(s):  
Jagdish Pratap Narayan Giri
Keyword(s):  
Pressure Gradient ◽  
Mechanical Stress ◽  
Critical Analysis ◽  
Shear Failure ◽  
Drilling Fluid ◽  
Well Bore ◽  
Fluid Modeling ◽  
Failure Pressure ◽  
Chemical Osmosis ◽  
Well Bore Stability

scholarly journals Pemanfaatan Wellbore Strengthening Agent Selama Pengeboran di Onshore Sumatera Bagian Utara Indonesia

2020 ◽  
Vol 1 (2) ◽  
pp. 47-51
Author(s):  
Aly Rasyid
Keyword(s):  
Filter Cake ◽  
Drilling Fluid ◽  
Well Bore ◽  
Limited Data ◽  
Well Drilling ◽  
Drilling Engineering ◽  
Well Bore Stability ◽  
Wellbore Strengthening ◽  
Stability Results

At northern part of Sumatera Indonesian onshore many drilling issues were encounteredin the area, in particular the overlying shales above the pay zones in the high deviatedtrajectory wells. Since the last well drilling in this area was 70’ era, so that limited data isanother drilling engineering challenge, especially to provide an accurate drilling fluid. Tocombat the drilling issues, utilization of pre-treated wellbore strengthening agent wasapplied to reduce well bore issues and strengthen the well with an effective filter cake. In Northern Sumatera Indonesian onshore well in Indonesia was used as a case study. First a brief understanding and fundamentals of geo-mechanics is described in reference to wellconstruction as well as filter cake fundamental to protect the hole stability. Results,observations and conclusions were drawn upon using a case study comparing a well ononshore in Indonesia which had many drilling problems such as stuck pipe/differentialsticking and washouts/hole enlargement issues related to well bore stability, after using thewellbore stability agent, the problems that encountered significantly decrease.

Effect of Drilling Fluid Temperature on Formation Fracture Pressure Gradient

2021 ◽  
Author(s):  
Ahmed Mostafa Samak ◽  
Abdelalim Hashem Elsayed
Keyword(s):  
High Temperature ◽  
Pressure Gradient ◽  
Thermal Effect ◽  
Drilling Fluid ◽  
Wellbore Stability ◽  
Cooling Effect ◽  
Fluid Temperature ◽  
Lost Circulation ◽  
Fracture Pressure ◽  
Downhole Temperature

Abstract During drilling oil, gas, or geothermal wells, the temperature difference between the formation and the drilling fluid will cause a temperature change around the borehole, which will influence the wellbore stresses. This effect on the stresses tends to cause wellbore instability in high temperature formations, which may lead to some problems such as formation break down, loss of circulation, and untrue kick. In this research, a numerical model is presented to simulate downhole temperature changes during circulation then simulate its effect on fracture pressure gradient based on thermo-poro-elasticity theory. This paper also describes an incident occurred during drilling a well in Gulf of Suez and the observations made during this incident. It also gives an analysis of these observations which led to a reasonable explanation of the cause of this incident. This paper shows that the fracture pressure decreases as the temperature of wellbore decreases, and vice versa. The research results could help in determining the suitable drilling fluid density in high-temperature wells. It also could help in understanding loss and gain phenomena in HT wells which may happen due to thermal effect. The thermal effect should be taken into consideration while preparing wellbore stability studies and choosing mud weight of deep wells, HPHT wells, deep water wells, or wells with depleted zones at high depths because cooling effect reduces the wellbore stresses and effective FG. Understanding and controlling cooling effect could help in controlling the reduction in effective FG and so avoid lost circulation and additional unnecessary casing points.

scholarly journals Simulation of steady-state cuttings transport through a horizontal annulus channel

2019 ◽  
Vol 196 ◽  
pp. 00011 ◽  
Author(s):  
Yaroslav Ignatenko ◽  
Andrey Gavrilov ◽  
Oleg Bocharov ◽  
Roland May
Keyword(s):  
Steady State ◽  
Pressure Gradient ◽  
Yield Stress ◽  
Cross Section ◽  
Drilling Fluid ◽  
Drill Pipe ◽  
Axial Flow ◽  
Cuttings Transport ◽  
Rigid Spheres ◽  
Pipe Rotation

The current study is devoted to simulating cuttings transport by drilling fluid through a horizontal section of borehole with an annular cross section. Drill pipe rotates in fixed eccentric position. Steady-state flow is considered. Cuttings are rigid spheres with equal diameters. The carrying fluid is drilling mud with Herschel-Bulkley rheology. Suspension rheology depends on local shear rate and particles concentration. Continuous mixture model with algebraic equation for particles slipping velocity is used. Two hydrodynamic regimes are considered: axial flow without drill pipe rotation and with drill pipe rotation. In the case of axial flow was shown that increasing of power index n and consistency factor k increases pressure gradient and decreases cuttings concentration. Increasing of yield stress leads to increasing of pressure gradient and cuttings concentration. Cuttings concentration achieves constant value for high yield stress and not depends on it. Rotation of the drill pipe significantly changes the flow structure: pressure loss occurs and particles concentration decreases in the cross section. Two basic regimes of rotational flow are observed: domination of primary vortex around drill pipe and domination secondary vorticity structures. Transition between regimes leads to significant changes of flow integral parameters.

New Strong Inhibitory Polyamine Drilling Fluid System Research in Yubei Area

2013 ◽  
Vol 807-809 ◽  
pp. 2519-2522
Author(s):  
Wan Long Huang ◽  
Yi Shan Lou ◽  
Liang Zhu ◽  
Zhong Hui Li
Keyword(s):  
Water Pollution ◽  
High Pressure ◽  
Salt Water ◽  
Drilling Fluid ◽  
Well Bore ◽  
System Research ◽  
Fluid System ◽  
Temperature Resistance ◽  
Evaluation Test ◽  
Made In

Yubei area exist thick mud shale, mudstone, gypsum mudstone and high pressure brine formation. In the course of drilling, the problems are most conspicuous which include well bore instability, bit balling and so on. In allusion to complex formation and complex accident, the polyamine form strong inhibitory polyamine collapse prevention drilling fluid on the basis of KCl-polysulfonate drilling fluid system was used in Yubei area. After the analysis on the mechanism of the strong inhibitory polyamine polymer drilling fluid system, the polyamine performance evaluation test made in laboratory shows that the drilling fluid system has good rheological property, high temperature resistance, clay and salt water pollution resistance. This drilling fluid system cooperate with KCl improve the ability of inhibition of drilling fluid, meet the requirements of stabilize borehole wall, which carried on the field test in YB A well has obtained good application effect.

scholarly journals Effective stresses and shear failure pressure from in situ Biot's coefficient, Hejre Field, North Sea

2016 ◽  
Vol 65 (3) ◽  
pp. 808-822 ◽  
Author(s):  
J.B. Regel ◽  
I. Orozova-Bekkevold ◽  
K.A. Andreassen ◽  
N.C. Høegh van Gilse ◽  
I.L. Fabricius
Keyword(s):  
North Sea ◽  
Shear Failure ◽  
Failure Pressure ◽  
Effective Stresses ◽  
Biot’S Coefficient

On the filtrate drilling fluid formation and near well-bore damage along the petroleum well

2015 ◽  
Vol 135 ◽  
pp. 299-313 ◽  
Author(s):  
Hamidréza Ramézani ◽  
Rezki Akkal ◽  
Nathalie Cohaut ◽  
Mohamed Khodja ◽  
Toudert Ahmed-Zaid ◽  
...  
Keyword(s):  
Drilling Fluid ◽  
Well Bore ◽  
Fluid Formation

A Nonlinear Model for the Dynamics of Penetration Into Geological Targets

1982 ◽  
Vol 49 (1) ◽  
pp. 26-30 ◽  
Author(s):  
F. R. Norwood ◽  
M. P. Sears
Keyword(s):  
Shear Failure ◽  
Nonlinear Ordinary Differential Equation ◽  
Stress Wave Propagation ◽  
Normal Impact ◽  
Material Models ◽  
Shooting Technique ◽  
Failure Pressure ◽  
Asymptotic Values ◽  
Specific Material ◽  
General Material

A general theory is developed for predicting stress and force histories for normal impact and penetration of geological targets by conical-nosed projectiles. To account for general material properties, the target medium is described by arbitrary hydrostat and shear failure-pressure relations. Using the cylindrical cavity approximation, the penetration dynamics reduce to a problem of radially symmetric stress wave propagation involving a nonlinear, ordinary, differential equation in terms of similarity variables. This equation is solved numerically by a shooting technique which is initiated by asymptotic values at the wave front. Numerical results are given for the stresses on the penetrator nose for some specific material models.

Paradigm Shift in Completion Limits: Open Hole Gravel Pack in Highly Depleted Reservoirs Drilled with Well Bore Strengthening Technology

2021 ◽  
Author(s):  
Kevin Whaley ◽  
Phillip J Jackson ◽  
Michael Wolanski ◽  
Tural Aliyev ◽  
Gumru Muradova ◽  
...  
Keyword(s):  
Laboratory Testing ◽  
Drilling Fluid ◽  
Drilling Fluids ◽  
Well Bore ◽  
Drilling Mud ◽  
Additional Time ◽  
Sand Control ◽  
Production Wells ◽  
Open Hole ◽  
Gravel Pack

Abstract Open Hole Gravel Pack (OHGP) completions have been the primary completion type for production wells in the Azeri-Chirag-Gunashli (ACG) field in Azerbaijan for 20 years. In recent years, it has been required to use well bore strengthening mud systems to allow drilling the more depleted parts of the field. This paper describes the major engineering effort that was undertaken to develop systems and techniques that would allow the successful installation of OHGP completions in this environment. OHGP completions have evolved over the last 3 decades, significantly increasing the window of suitable installation environments such that if a well could be drilled it could, in most cases, be completed as an OHGP if desired. Drilling fluids technology has also advanced to allow the drilling of highly depleted reservoirs with the development of well bore strengthening mud systems which use oversized solids in the mud system to prevent fracture propagation. This paper describes laboratory testing and development of well construction procedures to allow OHGPs to be successfully installed in wells drilled with well bore strengthening mud systems. Laboratory testing results showed that low levels of formation damage could be achieved in OHGPs using well bore strengthening mud systems that are comparable to those drilled with conventional mud systems. These drilling fluid formulations along with the rigorous mud conditioning and well clean-up practices that were developed were first implemented in mid-2019 and have now been used in 6 OHGP wells. All 6 wells showed that suitable levels of drilling mud cleanliness could be achieved with limited additional time added to the well construction process and operations and all of them have robust sand control reliability and technical limit skins. Historically it was thought that productive, reliable OHGP completions could not be delivered when using well bore strengthening mud systems due to the inability to effectively produce back filter cakes with large solids through the gravel pack and the ability to condition the mud system to allow sand screen deployment without plugging occurring. The engineering work and field results presented demonstrate that these hurdles can be overcome through appropriate fluid designs and well construction practices.

Well Bore Stability Using a New Dynamic Model

2012 ◽  
Vol 30 (19) ◽  
pp. 2066-2075
Author(s):  
M. Salarian ◽  
A. Mirzaghorbanali ◽  
H. Ghasemzadeh ◽  
S. Sadeghian
Keyword(s):  
Dynamic Model ◽  
Well Bore ◽  
Well Bore Stability
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