scholarly journals Influence of the Technological Gap Value of the Tool-Joint Tapered Thread on the Drilling Mud Flow Rate in Its Screw Coupling

2017 ◽  
Vol 3 (2) ◽  
pp. 24-31 ◽  
Author(s):  
Lubomyr Borushchak ◽  
◽  
Stepan Borushchak ◽  
Oleh Onysko ◽  
◽  
...  
Keyword(s):  
Flow Rate ◽  
Drilling Mud ◽  
Technological Gap ◽  
Mud Flow ◽  
Tool Joint

The Effects of Drilling Mud and Weight Bit on Stability and Vibration of a Drill String

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
Ali Asghar Jafari ◽  
Reza Kazemi ◽  
Mohammad Faraji Mahyari
Keyword(s):  
Angular Velocity ◽  
Flow Rate ◽  
Natural Frequencies ◽  
Drill String ◽  
Vibrational Amplitude ◽  
Drilling Process ◽  
Drilling Mud ◽  
Non Linear ◽  
Weight On Bit ◽  
Mud Flow

The main goal of this research is to analyze the effects of drilling mud flow rate, drill string weight, weight on bit and angular velocity on stability and vibration of a drill string. To this end, kinetic and potential energies of a rotating drill string are written while axial and lateral vibrations are considered. The effects of the drill string’s weight, weight on bit and geometrical shortening are considered in the model. Drilling mud’s effects are modeled by the Paidoussis formulations. The finite element method is employed to discrete the formulations. The stabilizers are modeled by dropping the coincided nodes. Linear (Flutter method) and non-linear methods are employed to analyze a drill string’s stability for different weight on a bit, angular velocity, drilling mud flow rate and numbers and arrangements of stabilizers. These results represent the significant effects of non-linear terms. Also, the effects of drilling mud flow rate and weight on bit on the natural frequencies and time responses are illustrated. Increasing drilling mud flow rate causes decreasing of natural frequencies and vibrational amplitude. Furthermore, increasing weight on bit leads to decreasing natural frequencies and increasing vibrational amplitude. These formulations can be used to choose the safest working conditions in the drilling process.

scholarly journals Research on Mud Flow Rate Measurement Method Based on Continuous Doppler Ultrasonic Wave

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Quan Zhou ◽  
Hui Zhao ◽  
Yufa He ◽  
Shengnan Li ◽  
Shiquan Jiang ◽  
...  
Keyword(s):  
Doppler Ultrasound ◽  
Flow Rate ◽  
Continuous Wave ◽  
Doppler Frequency ◽  
Drilling Mud ◽  
Continuous Wave Doppler ◽  
Gas Kick ◽  
Annular Pipe ◽  
Judgment Data ◽  
Mud Flow

In deep-water drilling processes, the flow rate of drilling mud inside an annular pipe is significant judgment data for early kick detection. On the basis of the continuous-wave Doppler ultrasound, this paper proposes a new detection method of nonoriented continuous-wave Doppler ultrasound. The method solves the problem of the ultrasound having great attenuation in mud and not receiving effective signals by using a continuous ultrasound. Moreover, this method analyzes the nonoriented characteristics of ultrasound reflection on principle and proposes the detection of ultrasound Doppler frequency shift by detecting Lamb wave, which releases the detection of oil-based mud flow rate in a nonintrusive annular pipe. The feasibility of the method is verified through theoretical analysis and numerous experiments on a gas kick simulation platform. The measurement result has reached a flow accuracy approximating to the intrusive flow meter.

Computational study on drilling mud flow through wellbore annulus by Giesekus viscoelastic model

2020 ◽  
pp. 095440892094380
Author(s):  
Mohammad Amir Hasani ◽  
Mahmood Norouzi ◽  
Morsal Momeni Larimi ◽  
Reza Rooki
Keyword(s):  
Reynolds Number ◽  
Friction Coefficient ◽  
Pressure Drop ◽  
Elastic Property ◽  
Taylor Number ◽  
Drilling Fluids ◽  
Drilling Mud ◽  
Axial Pressure ◽  
Flow Through ◽  
Mud Flow

Cuttings transport from wellbore annulus to the surface via drilling fluids is one of the most important problems in gas and oil industries. In the present paper, the effects of viscoelastic property of drilling fluids on flow through wellbore annulus are studied numerically by use of computational fluid dynamics simulation in OpenFOAM software. This problem is simulated as the flow between two coaxial annulus cylinders and the inner cylinder is rotating through its axes. Here, the Giesekus model is used as the nonlinear constitutive equation. This model brings the nonlinear viscosity, normal stress differences, extensional viscosity and elastic property. The numerical solution is obtained using the second order finite volume method by considering PISO algorithm for pressure correction. The effect of elasticity, Reynolds number, Taylor number and mobility factor on the velocity and stress fields, pressure drop, and important coefficient of drilling mud flow is studied in detail. The results predicted that increasing elastic property of drilling mud lead to an initial sharp drop in the axial pressure gradient as well as Darcy-Weisbach friction coefficient. Increasing the Reynolds number at constant Taylor number, resulted an enhancing in the axial pressure drop of the fluid but Darcy-Weisbach [Formula: see text] friction coefficient mainly reduced.

Simulation of Heave-Induced Pressure Oscillations in Herschel-Bulkley Muds

SPE Journal ◽  
2017 ◽  
Vol 22 (05) ◽  
pp. 1635-1653 ◽  
Author(s):  
Timm Strecker ◽  
Ole Morten Aamo ◽  
Henrik Manum
Keyword(s):  
Flow Rate ◽  
Time Domain ◽  
Nonlinear Function ◽  
Domain Model ◽  
Nonlinear Phenomena ◽  
Computationally Efficient ◽  
Pressure Oscillations ◽  
Realistic Geometries ◽  
Practical Implications ◽  
Mud Flow

Summary Heave induces pressure oscillations when drilling offshore from floating rigs. A time-domain model is proposed to analyze and predict such pressure oscillations. The model considers the coupled dynamics of the mud and the drillstring, Herschel-Bulkley-type rheology, and realistic geometries. A computationally efficient method to evaluate friction as a nonlinear function of the mud-flow rate and drillstring velocity is discussed. In a simulation study, we illustrate several nonlinear phenomena that have important practical implications but were not included in previous, simpler models. In particular, muds with a yield point can increase the pressure amplitudes significantly, and severe downhole-pressure oscillations are not detectable from topside measurements in many cases.

Helical Flow of Drilling Mud With Cuttings in a Vertical Well

2021 ◽  
Author(s):  
Yaroslav Ignatenko ◽  
Andrey Gavrilov ◽  
Oleg Bocharov
Keyword(s):  
Drill Pipe ◽  
Helical Flow ◽  
Drilling Mud ◽  
Cuttings Transport ◽  
Pressure Drops ◽  
Transport Efficiency ◽  
Vertical Well ◽  
Solid Region ◽  
Turbulence Dispersion ◽  
Mud Flow

Abstract The paper presents the results of an investigation into drilling mud flow with cuttings in a vertical well. The drilling mud rheology was described with the Herschel-Bulkley model. The axial Reynolds number was around 1000, the flow regime changing together with drill pipe RPM. The investigation covered the flow’s structures, integral parameters and cuttings transport in relation to drill pipe RPM and rate of penetration (ROP). In the laminar flow, most of the particles were localized in the quasi-solid region to move together with the last; the integral parameters had little dependence on drill pipe RPM increase. Increasing drill pipe RPM resulted in formation of the Görtler vortices near the channel’s external and internal walls, whose interaction led to the formation of smaller eddies converting the flow into a turbulent one. Due to the turbulence dispersion, the region taken by the particles widened. Particles suppress the vortex intensity near the channel’s external wall. Under the conditions described, increasing drill pipe RPM and ROP resulted in higher pressure drops and lower transport efficiency.

Experimental Study of Drilled Cuttings Transport Using Common Drilling Muds

1983 ◽  
Vol 23 (01) ◽  
pp. 11-20 ◽  
Author(s):  
Syed M. Hussaini ◽  
Jamal J. Azar
Keyword(s):  
Particle Size ◽  
Rheological Properties ◽  
Flow Rate ◽  
Carrying Capacity ◽  
Transport Model ◽  
Drilling Fluid ◽  
Fluid Velocity ◽  
Drilling Mud ◽  
Pressure Losses ◽  
Drilling Muds

Abstract Experiments are conducted with actual drilling muds to study the behavior of drilled cuttings in a vertical annulus. The effect of parameters such as particle size, flow rate, apparent viscosity, and yield point to plastic viscosity ratio on mud-carrying capacity are studied. The applicability of a semiempirical transport model developed by Zeidler also is investigated. It has been shown that in vertical annuluses, the fluid annular velocity has a major effect on the carrying capacity of muds, while the other parameters have an effect only at low to medium fluid annular velocities. We also conclude that Zeidler's semiempirical formulations for the prediction of drilled cuttings behavior are valid with certain limitations. Introduction One of the most important functions of a drilling fluid is to transpose the drilled particles (cuttings) generated by the drill bit to the surface through the wellbore annulus. This commonly is called the "carrying capacity" of drilling mud. Factors affecting the ability of drilling muds to lift cuttings arefluid rheological properties and flow rate,particle settling velocities,particle size and size distribution, geometry, orientation, and concentration,penetration rate of drill bits,rotary speed of drillstring,fluid density.annulus inclination, anddrillpipe position in the wellbore (eccentricity) and axially varying flow geometry. With the advent of deeper drilling and better bit designs, the demand for expending most of the energy at the bit has made it necessary to minimize the pressure losses in the annulus. These pressure losses depend on the fluid velocity, fluid density, and particle concentration. By control of these factors, pressure losses can be minimized. The particle slip velocity is an important factor and is defined as the velocity at which a particle tends to settle in a fluid because of is own weight. The velocity depends on the particle size, its geometry, its specific weight, and fluid rheological properties. The carrying capacity of muds also is affected by the velocity profile in the annulus. With all these variables acting simultaneously, the determination of carrying capacity of a mud becomes a complicated problem. An optimal drilling fluid is expected to lift the cuttings from the wellbore, suspend them when circulation is stopped, and drop them at the surface. Failure to achieve this performance often leads to problems that are costly and performance often leads to problems that are costly and time-consuming to solve. To avoid such problems, the previously mentioned parameters are to be considered in previously mentioned parameters are to be considered in the design of an optimal drilling fluid. Previous Investigations Previous Investigations SPEJ P. 11

Flow Rate-Dependent Skin in Water Disposal Injection Well

2016 ◽  
Vol 138 (5) ◽  
Author(s):  
Ibrahim M. Mohamed ◽  
Gareth I. Block ◽  
Omar A. Abou-Sayed ◽  
Salaheldin M. Elkatatny ◽  
Ahmed S. Abou-Sayed
Keyword(s):  
Flow Rate ◽  
Hydraulic Fracture ◽  
Produced Water ◽  
Gas Production ◽  
Gas Content ◽  
Well Test ◽  
Drilling Mud ◽  
Flow Rates ◽  
Skin Factor ◽  
Injection Flow

Reinjection is one of the most important methods to dispose fluid associated with oil and natural gas production. Disposed fluids include produced water, hydraulic fracture flow back fluids, and drilling mud fluids. Several formation damage mechanisms are associated with the injection including damage due to filter cake formed at the formation face, bacteria activity, fluid incompatibility, free gas content, and clay activation. Fractured injection is typically preferred over matrix injection because a hydraulic fracture will enhance the well injectivity and extend the well life. In a given formation, the fracture dimensions change with different injection flow rates due to the change in injection pressures. Also, for a given flow rate, the skin factor varies with time due to the fracture propagation. In this study, well test and injection history data of a class II disposal well in south Texas were used to develop an equation that correlates the skin factor to the injection flow rate and injection time. The results show that the skin factor decreases with time logarithmically as the fracture propagates. At higher injection flow rates, the skin factor achieved is lower due to the larger fracture dimensions that are developed at higher injection flow rates. The equations developed in this study can be applied for any water injector after calibrating the required coefficients using injection step rate test (SRT) data.

The Effect of Drilling Mud Flow on the Lateral and Axial Vibrations of Drill String

2010 ◽  
Author(s):  
Reza Kazemi ◽  
Ali Asghar Jafari ◽  
Mohammad Faraji Mahyari
Keyword(s):  
Potential Energy ◽  
Lagrange Equation ◽  
Continuous System ◽  
Summation Method ◽  
Drill String ◽  
Hertzian Contact ◽  
Lateral Vibration ◽  
Drilling Mud ◽  
Lateral Vibrations ◽  
Mud Flow

In this research, the effects of drilling mud flow and WOB force on the lateral vibration of drill string are investigated. To this goal, the kinetic and potential energy of drill string for axial and lateral vibrations are written in an integral equation. In potential energy equation, the effect of geometrical shortening, which causes nonlinear coupling between axial and lateral vibration, is considered. Drilling mud forces are modeled by Paidoussis formulations. The works done by WOB force, weight of drill string and drilling mud forces are calculated. The mode summation method is employed to convert the continuous system to a discrete one. Dropping and considering third and fourth order tensor of potential energy lead to linear and nonlinear system, respectively. The effects of stabilizers are modeled by a linear stiff spring. The wall contact is modeled by Hertzian contact force. Lagrange equation is employed for finding the equations of motions. First and second natural frequencies of drill string are found for different WOB and drilling mud flow. Also the effects of drilling mud and nonlinear terms on lateral vibration of drill string are investigated. The effect of drilling mud on the post buckling vibration of drill string is also delivered. This formulation can be used for optimization of drilling mud flow, WOB and the number and positions of stabilizer so that the lateral vibration of drill string is minimized.

Effect of Mud Shedding on Riser Anti-Recoil Control at Emergency Disconnect

2012 ◽  
Author(s):  
Songcheng Li ◽  
Mike Campbell ◽  
Hugh Howells ◽  
Simeon Powell
Keyword(s):  
Sea Water ◽  
Housing System ◽  
Drilling Mud ◽  
Element Analysis ◽  
Before And After ◽  
Pressure Impact ◽  
Emergency Events ◽  
Mud Pressure ◽  
Mud Flow

With drilling capability extends to water depths up to 3000m, significantly increased is the risk associated with a failed riser recoil control in the event of an emergency riser disconnect due to loss of vessel station keeping. In deeper waters the tensioner system undertakes higher top tension due to the accumulation of riser length and mud weight. During emergency disconnect, the riser is disconnected between the blow-out preventer (BOP) and the lower marine riser package (LMRP), releasing the base tension and mud pressure. Impact between the top riser system and the diverter housing system should be avoided, and the clearance between the LMRP and BOP should be secured. Efforts have been continuously made in the industry to achieve a more accurate predict of the riser recoil response. The relevance of mud discharge to recoil control has been widely discussed but little quantitative data has been revealed in the literature. In this paper, effect of mud shedding on riser recoil response is discussed. The Herschel-Bulkley rheology model is utilized for mud flow and is considered the latest advance in the drilling industry. Water hammer theories with column separation are modified to account for mud discharge in laminar, transitional and turbulent flow regimes. As a case study herein, recoil response of a drilling riser attached to a dynamically positioned semi-submersible drilling vessel is assessed to present the mud discharge effect on riser anti-recoil control. At emergency events, the riser is disconnected above the BOP, which is located at a water depth of about 2150m for this study. Mud is generally preferred to be freely discharged during an emergency disconnect for ease of anti-recoil control and riser integrity. The density difference between drilling mud in the riser annulus and sea water outside the riser outer casing before disconnect induces a high pressure difference, which drives mud shedding at riser disconnect. Mud flow rate plays an important role in the speed control of the riser uplift. 3D finite element analysis is performed in time domain to simulate riser response before and after disconnect. 2HRECOIL software is integrated into ANSYS user programmable features to better model the riser response and mud discharge.

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