A New MTV Computer Package for Hole-Cleaning Design and Analysis
- J.T. Ford (Heriot-Watt U.) | Erhu Goo (Heriot-Watt U.) | M.B. Oyeneyin (Heriot-Watt U.) | J.M. Peden (Heriot-Watt U.) | M.B. Larrucia (Heriot-Watt U.) | David Parker (Heriot-Watt U.)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- September 1996
- Document Type
- Journal Paper
- 168 - 172
- 1996. Society of Petroleum Engineers
- 1.11 Drilling Fluids and Materials, 1.6 Drilling Operations, 1.7.7 Cuttings Transport, 4.3.4 Scale, 1.10 Drilling Equipment
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This paper describes a computer package that can be used to calculate the minimum transport velocity (MTV) required to ensure efficient hole cleaning during deviated drilling operations. The package was developed in the Dept. of Petroleum Engineering at Heriot-Watt U. It operates in a Windows environment and allows the user to do the following:
Define, from viscometer data, the rheological model (PowerLaw, Bingham Plastic, or Herschel-Bulkley) that best describes a particular drilling fluid.
Model the drilling fluid velocity profile in a defined annular geometry.
Predict the minimum circulation rate required to ensure efficient cuttings transport for a wide range of operational conditions.
The paper describes how the lift and drag forces on the cuttings have been determined and used in the development of the package. Case studies that demonstrate the functionality of the package are also presented.
One of the primary functions of a drilling fluid is to transport drilled cuttings out of the hole. However, because of the wide range of variables involved, it is very difficult to model this process and therefore a great deal of experimental and theoretical research has been focused on this issue.1-12 This work has been largely empirical but has clearly demonstrated that the efficiency of cuttings transport depends on the following factors:
Fluid properties (rheological properties and density).
Cuttings size, shape, and concentration.
Rate of pipe rotation and pipe eccentricity.
Fluid flow regime (laminar or turbulent).
The drilled cuttings transport research team in the Dept. of Petroleum Engineering at Heriot-Watt U. have been conducting experimental and theoretical research in the area of drilled cuttings transport since 1986.1-4 The principal objectives of this work have been to develop semiempirical, mathematical models and a computer package that can predict the circulation rate required to ensure efficient hole cleaning.
The work has been oriented primarily toward the continuous transport of cuttings. However, the removal of cuttings beds, when formed, has also been investigated.
Scope of Work.
When drilling ahead, there is a critical annular velocity above which all cuttings will be carried out of the hole, and below which the cuttings will settle vertically, packing off the entire annulus of a vertical well or forming a stationary bed on the low side wall of the annulus, in a deviated well. This critical velocity has been called MTV. For any given situation, the mean annular velocity of the drilling fluid must be greater than or equal to the MTV to ensure that all cuttings are removed from the hole.
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