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When drilling challenging formations such as very thick highly fractured sour reservoirs or carbonate/karst formations, a lost-circulation zone can be encountered. This causes mud to be lost and gas kick to take place, making the drilling process uncontrollable. Blocking or plugging wide fractures is impossible in many cases, which results in severe safety issues associated with toxic gases.
This study investigates an application of mud cap drilling by injecting foam mixture into the annulus for well control in such harsh conditions. An annular fluid column with foam mixture can be used to prevent kicks and push the toxic gas back into the formation down along the annulus. This foam-assisted mud cap drilling process has been proved to reduce non-productive time and fluid expenses.
This study presents how to model and simulate the process with accurate foam characteristics when foams are used to suppress gas kicks under certain well and fluid conditions. More specifically, this study deals with three scenarios: Base Scenario with a relatively short response time such that the injected foams do not contact the formation gas, and Scenario 1 and 2 with a relatively long response time such that the injected foams interact with the gas, with and without foam coalescence respectively, at the foam/gas interface. The results show how mud-cap drilling parameters (such as pressure, foam density (or, equivalent mud weight), foam velocity, and foam quality) change at different operating conditions and scenarios. Non-Newtonian foam rheology, depending on bubble size and bubble size distribution as modeled by
Learn more about training courses being offered. Learn more about training courses being offered. This course covers the fundamental principles concerning how hydraulic fracturing treatments can be used to stimulate oil and gas wells. It includes discussions on how to select wells for stimulation, what controls fracture propagation, fracture width, etc., how to develop data sets, and how to calculate fracture dimensions. The course also covers information concerning fracturing fluids, propping agents, and how to design and pump successful fracturing treatments. Learn more about training courses being offered. Current and future SPE Section and Student Chapter leaders are invited to engage and share.
Review our data policy for information about these graphics and how they may be used. The formation of scale deposits upon tubing, casing, perforations, and even on the formation face itself, can severely constrict fluid flow and reduce the production rate of oil and gas wells. In addition to lost production, a considerable portion of the workover budget is expended in efforts to remove these deposits and prevent their recurrence. As a consequence, scale prevention has been and continues to be a common exercise and is successfully applied in many areas. Although the principles behind scale formation and prevention are generally well understood, there are many new forms of scale prevention and new scale inhibitor application technologies. Some people consider scale prevention a mature subject matter area with “nothing new under the sun,” but in fact there are many new developments, some of which will be highlighted in this presentation. This presentation will review the major elements ...
Summary The occurrence of reversible mud losses and gains while drilling in naturally fractured formations (NFFs) is of primary concern. Borehole breathing can complicate the already difficult practice of fingerprinting the changes in the return-flow profile, hence undermining the reliability of kick detection. Issues can also derive from misdiagnosing a kick and attempting to kill a breathing well. The objective of this work is to correctly address the phenomenon and increase insights regarding its physical characterization. To represent this complex scenario, a model involving a continuously distributed fracture network is developed. A time-dependent, 1D dual-poroelastic approach is coupled with a variable fracture aperture and a passive porous phase. Finite fracture network length is considered, and no limitation on the number of fractures is posed. The latter permits us to analyze long openhole sections intersecting several fissures, which is a more realistic approach than the available single-fracture models. The proposed model is able to quantify pressure distribution in fractures and pores, together with the flow rate entering or exiting the fractures. Furthermore, a useful application of the model is proposed by suggesting its application as a breathing discriminator during kick diagnosis. The shut-in drillpipe pressure (SIDPP), recorded from a real kick, has been compared with one caused by a simulated breathing case. Introduction Drilling operations become more and more challenging and complicated when dealing with high-temperature, high-pressure, and deepwater wells.
By International Petroleum Technology Conference (IPTC) Monday, 25 March 0900-1600 hours Instructors: Olivier Dubrule and Lukas Mosser, Imperial College London Deep Learning (DL) is already bringing game-changing applications to the petroleum industry, and this is certainly the beginning of an enduring trend. Many petroleum engineers and geoscientists are interested to know more about DL but are not sure where to start. This one-day course aims to provide this introduction. The first half of the course presents the formalism of Logistic Regression, Neural Networks and Convolutional Neural Networks and some of their applications. Much of the standard terminology used in DL applications is also presented. In the afternoon, the online environment associated with DL is discussed, from Python libraries to software repositories, including useful websites and big datasets. The last part of the course is spent discussing the most promising subsurface applications of DL.
Schedule Session Details Expand All Collapse All Filter By Date All Dates Monday, March 05 Tuesday, March 06 Wednesday, March 07 Thursday, March 08 Filter By Session Type All Sessions General Activities Social and Networking Events Technical Sessions Technology Showcase Membership and Volunteer Events Training Course/Seminar Monday, March 05 07:00 - 18:00 Exhibitor Move-In Exhibit Halls A & B 08:00 - 17:00 Managed Pressure Drilling Ticketed Event Instructor(s) Deepak Gala This is a Training course. Learn More 13:00 - 17:00 Speaker Check-In 201 A & B 13:00 - 17:00 Registration Exhibit Hall A 13:00 - 19:00 DSATS/ART Symposium and Networking Reception Omni Hotel Fort Worth Ballroom 1-4 Moderator(s) David Reid, Chief Marketing Officer, NOV Speaker(s) Frank Springett, NOV; Richard Meehan, Schlumberger; Steve Krase, Nabors; Thomas Burke, OPC Foundation; Jay Hollingsworth, CTO Energistics Interoperability in Drilling Automation – What Can be Learned from Other Industries? SPE’s Drilling Systems Automation Technical Section (DSATS) and IADC’s Advanced Rig Technology Committee (ART) are holding a half-day symposium focusing on the importance of interoperability to unlock the potential of Drilling Systems Automation. Space is limited so be sure to register early which also ensures the early bird rate for members. The meeting will be followed by a sponsored reception for symposium attendees.
Occurrence of reversible mud losses and gains while drilling in naturally fractured formations is of primary concern. Borehole breathing can greatly complicate the already difficult practice of fingerprinting the changes in the return flow profile, hence undermining the reliability of kick detection. Issues can also derive from misdiagnosing a kick and attempting to kill a breathing well. The objective of this work is to correctly address the phenomenon and increase insights of its physical characterization. The fluid progressively flows in and out of fractures as a consequence of three mechanisms: (1) bulk volume deformation, (2) fluid compressibility, and (3) fracture aperture variation. To represent this complex scenario, a model involving a continuously distributed fracture network is developed. A time-dependent, one-dimensional dual-poroelastic approach is coupled with a variable fracture aperture and a passive porous phase. Finite fracture length is considered and no limitation on the number of fractures is posed. The latter permits us to analyze long open-hole sections intersecting several fissures, which is a more realistic approach than the available single fracture models. The proposed model is able to quantify pressure distribution in fractures and pores, together with the flow rate entering or exiting the fractures. When the fissured space is reduced to zero and incompressible bulk volume is considered, the solution reduces to that of classical reservoir engineering. A sensitivity analysis is performed on the physical properties of the formation and the drilling fluid. The latter provides a deeper insight on the factors that significantly influence breathing phenomena (i.e. drilling fluid weight, rheology and formation mechanical properties). Furthermore, a very useful application of the model is proposed by suggesting its application as a breathing discriminator during kick diagnosis. The shut-in drill pipe pressure, recorded from a real kick, has been compared to one caused by a simulated breathing case. Although the two SIDPPs show great similarities, the correct modelling of breathing can significantly help the identification of the major differences between a kick and breathing. Altogether, a comprehensive in-depth characterization of borehole breathing can help with kick diagnosis and can be used to effectively design unconventional drilling techniques such as Managed Pressure Drilling.
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