Simple Correlations and Analysis of Cuttings Transport With Newtonian and Non-Newtonian Fluids in Horizontal and Deviated Wells

Sorgun, Mehmet

doi:10.1115/1.4023740

Cited by 23 publications

(10 citation statements)

References 16 publications

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“…In the whole optimization process, the ants tend to find the position with the largest fitness value, which mathematically means the smallest error for solving the nonlinear equations set (i.e., the smallest objective function value in (12)). Next, use the fitness value to calculate the selection probability by (10). The selection probability represents the distance between each ant position and the optimum ant position (i.e., ant position with the largest fitness value).…”

Section: Solution-searching Procedurementioning

confidence: 99%

“…Over the past 30 years, considerable effort has been expended on solving cuttings transport problem in drilling horizontal wells. Many researchers developed various models [1][2][3][4][5][6][7][8][9][10] to investigate this problem, among which the two-layer model is one of the analytical research models and is formulated with highly nonlinear equations set.…”

Section: Introductionmentioning

confidence: 99%

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A New Mathematical Method for Solving Cuttings Transport Problem of Horizontal Wells: Ant Colony Algorithm

Liu

Heng-bin

et al. 2017

Mathematical Problems in Engineering

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Cuttings transport problem has long been recognized as one of the key difficulties in drilling horizontal wells, and the models in cuttings transport research are usually formulated with highly nonlinear equations set. When using Newton methods to solve real engineering problems with nonlinear equations set, the problems of result dependence on initial values, Jacobian matrix singularity, and variable outflow of its definition domain in iterations are three of the often-encountered difficulties. In this paper, the ant colony algorithm is applied to solve the two-layer cuttings transport model with highly nonlinear equations set. The solution-searching process of solving nonlinear equations set is transformed into an optimization process of searching the minimum value of an objective function by applying ant colony algorithm. Analyzing the results of the example, it can be concluded that ant colony algorithm can be used to solve the highly nonlinear cuttings transport model with good solution accuracy; transforming the solution-searching process of solving nonlinear equations set into an optimization process of searching the minimum value of the objective function is necessary; the real engineering problem should be simplified as much as possible to decrease the number of unknown variables and facilitate the use of ant colony algorithm.

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Section: Solution-searching Procedurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Mathematical Method for Solving Cuttings Transport Problem of Horizontal Wells: Ant Colony Algorithm

Liu

Heng-bin

et al. 2017

Mathematical Problems in Engineering

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“…A large number of laboratory stud ies [10][11][12][13][14][15][16][17][18] were carried out to evaluate the effect of pipe rotation on annular pressure loss. Most of these studies demonstrate both negative and positive effects of the rotation speed.…”

Section: Laboratory Studiesmentioning

confidence: 99%

Annular Frictional Pressure Losses During Drilling—Predicting the Effect of Drillstring Rotation

Saasen

2014

Journal of Energy Resources Technology

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Controlling the annular frictional pressure losses is important in order to drill safely with overpressure without fracturing the for mation. To predict these pressure losses, however, is not straight forward. First of all, the pressure losses depend on the annulus eccentricity. Moving the drillstring to the wall generates a wider flow channel in part of the annulus which reduces the frictional pressure losses significantly. The drillstring motion itself also affects the pressure loss significantly. The drillstring rotation, even for fairly small rotation rates, creates unstable flow and sometimes turbulence in the annulus even without axial flow.Transversal motion o f the drillstring creates vortices that destabi lize the flow. Consequently, the annular frictional pressure loss is increased even though the drilling fluid becomes thinner because of added shear rate. Naturally, the rheological properties of the drilling fluid play an important role. These rheological properties include more properties than the viscosity as measured by API procedures. It is impossible to use the same frictional pressure loss model for water based and oil based drilling fluids even if their viscosity profile is equal because o f the different ways these fluids build viscosity. Water based drilling fluids are normally constructed as a polymer solution while the oil based are combi nations o f emulsions and dispersions. Furthermore, within both water based and oil based drilling fluids there are functional dif ferences. These differences may be sufficiently large to require different models for two water based drilling fluids built with dif ferent types of polymers. In addition to these phenomena washouts and tool joints will create localised pressure losses. These local ised pressure losses will again be coupled with the rheological properties of the drilling fluids. In this paper, all the above men tioned phenomena and their consequences for annular pressure losses will be discussed in detail. North Sea field data is used as an example. It is not straightforward to build general annular pressure loss models. This argument is based on flow stability analysis and the consequences o f using drilling fluids with differ ent rheological properties. These different rheological properties include shear dependent viscosity, elongational viscosity and other viscoelastic properties.

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“…In order to develop such reservoirs efficiently and economically, the issue around how to control water coning should be addressed. In recent years, the wide use of horizontal well technology has led to better water coning management and enhanced oil production [1][2][3][4], Contributed by the Petroleum Division of ASME for publication in the Journal of Energy R esources T echnology. Manuscript In comparison to vertical wells, horizontal wells have many advantages, such as possess a larger oil producing capacity, enlarge oil-well contact area, change water coning model by turn ing coning into cresting, decrease water cresting velocity, and enhance oil production in high water-cut stage [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Reasonable Drawdown Pressure of Horizontal Wells in Oil Reservoir With Bottom Water

Liu

Zheng

et al. 2014

Journal of Energy Resources Technology

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For the development o f oil reservoir with bottom water, it is sig nificant to analyze the impact o f drawdown pressures on post water breakthrough performance of horizontal wells. Based on a small-scale and discretized physical simulation system, the impact of different drawdown pressures and the influence o f changing drawdown pressures in different water cut stage have been dis cussed. The results show that for thin oil with relatively high vis cosity (87.8 mPa.s), keeping a relatively large drawdown pressure in medium and low water cut stage is reasonable. But enlarging drawdown pressure in high water cut stage is harmful to increase ultimate oil recovery. For oil with further lower viscosity (21.4 mPa.s), adopting a small drawdown pressure and increasing it in medium and high water cut stage is reasonable. For the heavy oil (124.1 mPa.s), it is acceptable to enlarge drawdown pressure under the condition o f low water cut period.

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Simple Correlations and Analysis of Cuttings Transport With Newtonian and Non-Newtonian Fluids in Horizontal and Deviated Wells

Cited by 23 publications

References 16 publications

A New Mathematical Method for Solving Cuttings Transport Problem of Horizontal Wells: Ant Colony Algorithm

A New Mathematical Method for Solving Cuttings Transport Problem of Horizontal Wells: Ant Colony Algorithm

Annular Frictional Pressure Losses During Drilling—Predicting the Effect of Drillstring Rotation

Experimental Study of Reasonable Drawdown Pressure of Horizontal Wells in Oil Reservoir With Bottom Water

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