Use of Spreadsheet and Analytical Models to Simulate Solid, Water, Oil and Gas Flow in Underbalanced Drilling

Guo, Boyun

doi:10.2118/72328-ms

Cited by 9 publications

(1 citation statement)

References 18 publications

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“…Using the UBD technique, the bottom hole pressure can be controlled to be lower than the formation pressure. The low mud weight in UBD helps reduce rock strength and release drill cuttings from the hole bottom and subsequently increase ROP (Guo 2001). In addition to the direct use of low-density liquid (i.e., water, oil, low-density brine), the low-weight mud can also be gas (i.e., N 2 , CO 2 , air) or two-phase fluids such as foams and aerated liquids (Hossain and Wajheeuddin 2016;Guo et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Investigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations

Shi

Zhao

et al. 2018

Pet. Sci.

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To improve the rate of penetration (ROP) in drilling deep and hard formations, this paper proposes a new drilling method called coiled tubing partial underbalanced drilling (CT-PUBD). As a preliminary investigation into the new drilling method, this paper presents predictions of hole cleaning efficiency, drilling speed, cuttings migration and pressure loss in the drilling process with CT-PUBD. Based on numerical simulation and full-scale experimental studies, we conclude that using CT-PUBD, an underbalanced drilling condition can be achieved near the bit while maintaining wellbore safety at the same time. This condition can be achieved using a cuttings discharge device, a rotary packer and a backflow controller. According to the numerical simulations performed in this study, CT-PUBD can achieve high efficiency of hole cleaning. Along the cuttings migration process, the fluid velocities can reach the maximum values in the backflow holes. A full-scale laboratory experimental system was used to test the hydraulic characteristics and obtain the drilling performance of the new technology. The result shows that CT-PUBD significantly improves the ROP compared to the conventional drilling method. Keywords Partial underbalanced drilling Á Coiled tubing Á Flow fields Á Cuttings removal Á Rate of penetration (ROP)

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Section: Introductionmentioning

confidence: 99%

Investigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations

Shi

Zhao

et al. 2018

Pet. Sci.

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Influences of formation water invasion on the wellbore temperature and pressure in supercritical CO 2 drilling

Wang

Shen

2011

Petroleum Exploration and Development

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Foam Drilling Simulator

Paknejad

Schubert²,

Amani

2007

SPE Middle East Oil and Gas Show and Conference

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Although the use of compressible drilling fluids is experiencing growth, the flow behavior and stability properties of drilling foams are more complicated than those of conventional fluids. In contrast with conventional mud, the physical properties of foam change along the wellbore. Foam physical and thermal properties are strongly affected by pressure and temperature. Many problems associated with field applications still exist, and a precise characterization of the rheological properties of these complex systems needs to be performed. The accurate determination of the foam properties in circulating wells helps to achieve better estimation of foam rheology and pressure. A computer code is developed to process the data and closely simulate the pressure during drilling a well. The model also offers a detailed discussion of many aspects of foam drilling operations and enables the user to generate many comparative graphs and tables. The effects of some important parameters such as: back-pressure, rate of penetration, cuttings concentration, cuttings size, and formation water influx on pressure, injection rate, and velocity are presented in tabular form. A discretized heat transfer model is formulated with an energy balance on a control volume in the flowing fluid. The finite difference model (FDM) is used to write the governing heat transfer equations in discretized form. A detailed discussion on the determination of heat transfer coefficients and the solution approach is presented. Introduction Stable foam could be described as a special type of aerated drilling fluids. Foam is made up of a mixture of incompressible fluids injected with compressed air or other gases. In foam as a gas-liquid dispersion the incompressible fluid is the continuous phase and the gas is the discontinuous phase. The incompressible component is usually the mixture of treated fresh water and a surfactant foaming agent. Additives and foaming agents such as polymers, graphite, and asphalt can be added to the foam as viscosifiers, stabilizers, lubricants, and corrosion inhibitors. The compressible component is usually air, nitrogen, natural gases, and rarely CO2.

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Use of Spreadsheet and Analytical Models to Simulate Solid, Water, Oil and Gas Flow in Underbalanced Drilling

Cited by 9 publications

References 18 publications

Investigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations

Investigations into the coiled tubing partial underbalanced drilling (CT-PUBD) technique for drilling hard formations

Influences of formation water invasion on the wellbore temperature and pressure in supercritical CO 2 drilling

Foam Drilling Simulator

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