The Experts below are selected from a list of 2277 Experts worldwide ranked by ideXlab platform
Mohammad Ali Ahmadi - One of the best experts on this subject based on the ideXlab platform.
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An accurate model to predict Drilling Fluid Density at wellbore conditions
Egyptian Journal of Petroleum, 2018Co-Authors: Mohammad Ali Ahmadi, Seyed Reza Shadizadeh, Kalpit Shah, Alireza BahadoriAbstract:Knowledge about rheology of Drilling Fluid at wellbore conditions (High pressure and High temperature) is a need for avoiding Drilling Fluid losses through the formation. Unfortunately, lack of a universal model for prediction Drilling Fluid Density at the addressed conditions impressed the performance of Drilling Fluid loss control. So, the main motivation of this paper is to suggest a rigorous predictive model for estimating Drilling Fluid Density (g/cm3) at wellbore conditions. In this regard, a couple of particle swarm optimization (PSO) and artificial neural network (ANN) was utilized to suggest a high-performance model for predicting the Drilling Fluid Density. Moreover, two competitive machine learning models including fuzzy inference system (FIS) model and a hybrid of genetic algorithm (GA) and FIS (called GA-FIS) method were employed. To construct and examine the predictive models the data samples of the open literature were used. Based on the statistical criteria the PSO-ANN model has reasonable performance in comparison with other intelligent methods used in this study. Therefore, the PSO-ANN model can be employed reliably to estimate the Drilling Fluid Density (g/cm3) at HPHT condition.
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Toward reliable model for prediction Drilling Fluid Density at wellbore conditions
Neurocomputing, 2016Co-Authors: Mohammad Ali AhmadiAbstract:To prevent Drilling Fluid losses into formation at the High Pressure High Temperature (HPHT) conditions in oil/gas wellbores, it is highly necessary to have enough information about rheology of the Drilling Fluid. The lack of global model to estimate the Density of the Drilling Fluid at the wellbore conditions has adversely affected the plans of Drilling Fluid loss control. By gaining from a special sort of soft computing techniques, a new kind of intelligent based model developed by Suykens et al. and based on extended datasets reported in open literatures, it has noticeably become possible to defeat the aforementioned obstacles and elevate the performance of estimating the Drilling Fluid Density (g/cm3). In this regard, least square support vector machine was employed to predict rheology of the Drilling Fluid at wellbore conditions for different types of Drilling Fluids including oil based muds, water based muds, gas-aphrons. According to the average absolute relative deviation, correlation coefficient and mean square error (MSE), the proposed low parameter model has an acceptable robustness; integrity and reliability. Therefore, the proposed artificial intelligence based method can be considered as an alternative model to determine the Drilling Fluid Density (g/cm3) at wellbore condition when the essential experimental data are not obtainable or measureable.
Moe Key - One of the best experts on this subject based on the ideXlab platform.
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Prediction technique of formation pressure for scientific exploration well in Bohai Oilfield
Fault-block Oil & Gas Field, 2011Co-Authors: Moe KeyAbstract:In the process of oil and gas Drilling,formation pressure prediction is a very key basic work,especially for scientific exploration wells.The accurate prediction of formation pressure is of great importance to decide the Drilling Fluid Density,optimize the Drilling parameters,as well as design the most appropriate wellbore structure.According to the seismic data and the other data of geological exploration,well testing,well logging from the drilled wells in Bohai Oilfield,the formation information are obtained, including pore pressure,fracture pressure and collapse pressure.The safety window of reasonable Drilling Fluid is determined.The estimated formation pressure has been tested in real testing and it turns out with a high accuracy,which effectively guides the Drilling and completion work with a good application effect.
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Reasons of Borehole Instability in Block 2 of Chenghai Oilfield and its Measures
Petroleum Drilling Techniques, 2010Co-Authors: Moe KeyAbstract:Borehole instability often occurs in section 1 of Shahejie formation in Block 2,Chenghai Oilfield.Through investigating the impacts of lithology,mineral constituent,physical and chemical properties,formation three-pressure profile,inhibitory and sealing property of Drilling Fluid on mechanical characteristics and formation collapse pressure,it finds that the main reason for wellbore instability is that the Drilling Fluid Density is lower than formation collapse equivalent Drilling Fluid Density considering the well profile,formation stress and rock properties,and that the sealing capacity and mud cake quality are poor.The following measures were proposed.Drilling Fluid should be determined by formation collapse pressure.Drilling Fluid Density should be calculated by formation collapse pressure which is determined by well profile,formation stress,and rock properties.The inhibition of Drilling Fluid is enhanced by increasing the content ratio of potassium chloride and polyethylene glycol.The quality of internal and external mud cake is improved by increasing the content ratio of SMP,asphalt,efficient sealing agent.Using the above measures in Well Zhanghai 21-21L drilled with 155.6 mm,the wellbore instability was solved and the well was drilled to section 1 of Shahejie formation successfully.It needs 7 days to drill to 4 070 m and well logging and well completion were completed successfully.
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Prediction Model of Equivalent Drilling Fluid Density at High Temperature and High Pressure
Petroleum Drilling Techniques, 2009Co-Authors: Moe KeyAbstract:The effects of pressure and temperature on Drilling Fluids are considerable at high temperature and high pressure. There is a big error if the static pressure at the bottom hole was calculated with parameters of Drilling Fluids at stand condition,and kick,blowout or lost circulation may occur in wells with small margins between pore and fracture pressure. This work started with establishing the model for predicting the temperature distribution profile of Drilling Fluids inside the drill string and in the annulus during circulating,then laboratory tests were conducted and the Density property of oil-based Drilling Fluids was investigated. Based on the test,mathematical model for predicting the Density of both oil-based and water-based Drilling Fluids has been established,and the correlation coefficients are higher than 0.99. Mathematical models for predicting the equivalent static Density of Drilling Fluid have been established by combining the temperature model during circulating and Density model. The Prediction models can provide theoretical basis for managed pressure Drilling technology,it is significant to control downhole pressure properly and prevent problems and accidents.
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Cementation Quality Prediction Using Wavelet Neural Network Based on Orthogonal Scaling Function
Petroleum Drilling Techniques, 2008Co-Authors: Moe KeyAbstract:The advantages of orthogonal scaling function wavelet neural network and the complexity of cementation quality forecasting system were analyzed.Factors affecting cementing quality were analyzed using SAS system.A cementing quality prediction model was developed using wavelet neural network based on orthogonal scaling function considering the main factors.Input data of this model include main factors affecting cementing quality,including formation pore pressure,permeability,wellbore enlargement,wellbore diameter,Drilling Fluid Density,cement slurry Density,casing eccentricity,and displacement velocity.Cementing quality is output as a quantified number.The maximum relative error between prediction result and actual result is 6.87%,the calculation is fast which saves time.Therefore,the new model has a good future in application.
Yao Ru-gang - One of the best experts on this subject based on the ideXlab platform.
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Study and Application of Permitted Yield Point Control Boundary ofDrilling Fluid
The Open Petroleum Engineering Journal, 2014Co-Authors: Yao Ru-gang, Jiang Guan-cheng, Li Wei, Wang Yu-zhe, Zhang Hong-xia, Fan JinAbstract:To consider the needs for Drilling and the principles of carry and suspend formation cuttings, the permitted yield point control boundary model of Drilling Fluid was derived using solid-liquid dynamics under certain given assumptions. Corresponding calculation software was developed in c#. The results show that: Any one of the Drilling Fluid Density, pump discharge, plastic viscosity and Drilling Fluid pump cylinder bore increases would result in the permitted yield point control boundary which turned out to be narrow. Drilling Fluid pump discharge is the main cause of the decrease in the upper range of the permitted yield point control boundary. While Drilling Fluid Density is the main cause of the decrease in the lower range. Application had shown the practicality and accuracy of this model in Tarim oil field KS8 well.
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A Novel Method for the Design of Desirable Yield Point Range of Drilling Fluid
2013Co-Authors: Yao Ru-gang, Jiang Guan-cheng, Li Wei, Wang Yu-zhe, Fan JinAbstract:The objectives of this paper are to report a novel method for the de- sign of desirable yield point range of Drilling Fluid, which take consider of the needs for Drilling engineering and the principles of carry and suspend formation cuttings. The calculation model was derived using solid-liquid dynamics under certain given assumptions such as well structures, Drilling Fluid densities, depth, and etc., and corresponding software was developed in c#. Then, relationship between plastic viscosity and yield point has been expounded. For brevity, under the premise of no sedimentation, any one of the Drilling Fluid Density, pump discharge, plastic vis- cosity and Drilling Fluid pump cylinder bore increases would result in the desirable yield point range turned out to be narrow. Drilling Fluid pump discharge is the main cause of the decrease in the upper range of the desirable yield point range. While Drilling Fluid Density is the main cause of the decrease in the lower range. The value of yield point is recommended a little higher than the lower range. In summary, the research will provide a useful theoretical reference for designers and field personnel, and make the regulation a clear task.
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Research and Application of Permitted Rheological Parameter Control Window of Drilling Fluid
Science Technology and Engineering, 2013Co-Authors: Yao Ru-gangAbstract:Based on the dynamics theories of the solid-liquid systems,considered the needs for Drilling and the principles of carry and suspend formation cuttings,a reasonable method for the calculation of permitted rheological parameters control window of Drilling Fluid under certain given assumptions,established corresponding computational model is discussed,and finally,developed the corresponding calculation software.The calculation results show that any one of the Drilling Fluid Density,displacement,plastic viscosity and mud pump cylinder liner bore increases would lead to the permitted rheological parameters control window turn out to be narrow.The influence of Drilling Fluid displacement on regulation range is particularly evident.Mud pump displacement is the main factors which affect the maximum range of the permitted rheological parameters control window.And the lower range is mainly controlled by the Drilling Fluid Density.
Fan Jin - One of the best experts on this subject based on the ideXlab platform.
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Study and Application of Permitted Yield Point Control Boundary ofDrilling Fluid
The Open Petroleum Engineering Journal, 2014Co-Authors: Yao Ru-gang, Jiang Guan-cheng, Li Wei, Wang Yu-zhe, Zhang Hong-xia, Fan JinAbstract:To consider the needs for Drilling and the principles of carry and suspend formation cuttings, the permitted yield point control boundary model of Drilling Fluid was derived using solid-liquid dynamics under certain given assumptions. Corresponding calculation software was developed in c#. The results show that: Any one of the Drilling Fluid Density, pump discharge, plastic viscosity and Drilling Fluid pump cylinder bore increases would result in the permitted yield point control boundary which turned out to be narrow. Drilling Fluid pump discharge is the main cause of the decrease in the upper range of the permitted yield point control boundary. While Drilling Fluid Density is the main cause of the decrease in the lower range. Application had shown the practicality and accuracy of this model in Tarim oil field KS8 well.
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A Novel Method for the Design of Desirable Yield Point Range of Drilling Fluid
2013Co-Authors: Yao Ru-gang, Jiang Guan-cheng, Li Wei, Wang Yu-zhe, Fan JinAbstract:The objectives of this paper are to report a novel method for the de- sign of desirable yield point range of Drilling Fluid, which take consider of the needs for Drilling engineering and the principles of carry and suspend formation cuttings. The calculation model was derived using solid-liquid dynamics under certain given assumptions such as well structures, Drilling Fluid densities, depth, and etc., and corresponding software was developed in c#. Then, relationship between plastic viscosity and yield point has been expounded. For brevity, under the premise of no sedimentation, any one of the Drilling Fluid Density, pump discharge, plastic vis- cosity and Drilling Fluid pump cylinder bore increases would result in the desirable yield point range turned out to be narrow. Drilling Fluid pump discharge is the main cause of the decrease in the upper range of the desirable yield point range. While Drilling Fluid Density is the main cause of the decrease in the lower range. The value of yield point is recommended a little higher than the lower range. In summary, the research will provide a useful theoretical reference for designers and field personnel, and make the regulation a clear task.
Yang Li - One of the best experts on this subject based on the ideXlab platform.
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Borehole Stability in High-Temperature Formations
Rock Mechanics and Rock Engineering, 2013Co-Authors: Jingen Deng, Baohua Yu, Wenliang Li, Zijian Chen, Lianbo Hu, Yang LiAbstract:In oil and gas Drilling or geothermal well Drilling, the temperature difference between the Drilling Fluid and formation will lead to an apparent temperature change around the borehole, which will influence the stress state around the borehole and tend to cause borehole instability in high geothermal gradient formations. The thermal effect is usually not considered as a factor in most of the conventional borehole stability models. In this research, in order to solve the borehole instability in high-temperature formations, a calculation model of the temperature field around the borehole during Drilling is established. The effects of Drilling Fluid circulation, Drilling Fluid Density, and mud displacement on the temperature field are analyzed. Besides these effects, the effect of temperature change on the stress around the borehole is analyzed based on thermoelasticity theory. In addition, the relationships between temperature and strength of four types of rocks are respectively established based on experimental results, and thermal expansion coefficients are also tested. On this basis, a borehole stability model is established considering thermal effects and the effect of temperature change on borehole stability is also analyzed. The results show that the fracture pressure and collapse pressure will both increase as the temperature of borehole rises, and vice versa. The fracture pressure is more sensitive to temperature. Temperature has different effects on collapse pressures due to different lithological characters; however, the variation of fracture pressure is unrelated to lithology. The research results can provide a reference for the design of Drilling Fluid Density in high-temperature wells.
