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2014
Lost circulation is defined as the uncontrolled flow of mud into a thief zone and presents one of the major risks associated with drilling. The complete prevention of lost circulation is impossible, but limiting circulation loss is possible if certain precautions are taken. Failure to minimize lost circulation can greatly increase the cost of drilling,
Gaurina-Međimurec, Nediljka +1 more
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Lost circulation is defined as the uncontrolled flow of mud into a thief zone and presents one of the major risks associated with drilling. The complete prevention of lost circulation is impossible, but limiting circulation loss is possible if certain precautions are taken. Failure to minimize lost circulation can greatly increase the cost of drilling,
Gaurina-Međimurec, Nediljka +1 more
openaire +3 more sources
2018
Numerous LCMs have been proposed for curing lost circulation. However, due to the complexity of formation properties and fluid loss mechanisms, there is not a universal LCM suitable to all types of losses. The selection of LCMs is highly dependent on the formation types, fluid loss mechanisms (e.g. loss into pores, natural fractures, induced fractures,
Yongcun Feng, K. E. Gray
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Numerous LCMs have been proposed for curing lost circulation. However, due to the complexity of formation properties and fluid loss mechanisms, there is not a universal LCM suitable to all types of losses. The selection of LCMs is highly dependent on the formation types, fluid loss mechanisms (e.g. loss into pores, natural fractures, induced fractures,
Yongcun Feng, K. E. Gray
openaire +1 more source
2018
The ability to model fracture growth during lost circulation is critical for loss prevention and wellbore strengthening design. Such a model can provide useful information for the optimization of drilling fluid rheology, well configuration, pump schedule, and LCM particle size distribution.
Yongcun Feng, K. E. Gray
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The ability to model fracture growth during lost circulation is critical for loss prevention and wellbore strengthening design. Such a model can provide useful information for the optimization of drilling fluid rheology, well configuration, pump schedule, and LCM particle size distribution.
Yongcun Feng, K. E. Gray
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How to Solve Lost Circulation Problems
International Meeting on Petroleum Engineering, 1988ABSTRACT During drilling or cementing, lost circulation may be encountered due to the presence of highly permeable formations, e.g. high natural permeability in a sandstone, or large natural fractures and vugs as found in limestones. This problem is critical as it increases the drilling costs due to wasted time, plus the possibility of ...
B. Vidick, J.A. Yearwood, H. Perthuis
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Theory of Lost Circulation Pressure
SPE Annual Technical Conference and Exhibition, 1990ABSTRACT Conventional theories predicting borehole breakdown pressure assume breakdown occurs when the tangential stress at the borehole exceeds the tensile strength of the formation. Fracturing tests conducted during the DEA-13 joint industry project, however, showed that when drilling fluid was used as an injection fluid, borehole ...
N. Morita, A. D. Black, G -F. Fuh
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An Analysis and the Control of Lost Circulation
Journal of Petroleum Technology, 1951Abstract During the drilling of wells, fractures which are created or widened bydrilling fluid pressure are suspected of being a frequent cause of lostcirculation. A study of the variables which are believed by the authors to berelated to fracturing led to the premise that the presence of an effective ...
George C. Howard, P.P. Scott
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On the Shear Degradation of Lost-Circulation Materials
SPE Drilling & Completion, 2013Summary Lost-circulation materials (LCMs) are widely used to mitigate fluid loss when drilling permeable zones. Their effectiveness, however, generally declines with circulation time, and this decline is linked to the reduction in the average size of the solids components, or “shear degradation.” In this paper, dimensional analysis and ...
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SPE Journal
Summary Lost circulation (LC) is a serious problem in drilling operations, as it increases nonproductive time and costs. It can occur due to various complex factors, such as geological parameters, drilling fluid properties, and operational drilling parameters, either individually or in combination.
Yongcun Feng +5 more
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Summary Lost circulation (LC) is a serious problem in drilling operations, as it increases nonproductive time and costs. It can occur due to various complex factors, such as geological parameters, drilling fluid properties, and operational drilling parameters, either individually or in combination.
Yongcun Feng +5 more
openaire +1 more source
Fuzzy expert system for solving lost circulation problem
Applied Soft Computing, 2005Lost circulation is the most common problem encountered when drilling. This paper describes a distributed hybrid intelligent system, called SmartDrill, using fuzzy logic, expert system framework and Web services for helping petroleum engineers to diagnose and solve lost circulation problems.
Leonid Sheremetov +4 more
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Integrated Workflow for Lost Circulation Prediction
SPE International Symposium and Exhibition on Formation Damage Control, 2014Abstract Lost circulation has plagued the industry since the beginning of drilling. Historically, severity of losses has been categorized based on the amount of barrels lost to the formation, i.e., seepage, partial, and total. Though helpful, this strategy doesn't help understand the underlying drive mechanism(s) for losses and doesn't ...
Ali Ghalambor +3 more
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