Disposal of Oily Cuttings by Downhole Periodic Fracturing Injections, Valhall, North Sea: Case Study and Modeling Concepts

Moschovidis, Z.A.; Gardner, David C.; Sund, G.; Veatch, R.W.

doi:10.2118/25757-pa

Cited by 41 publications

(19 citation statements)

References 2 publications

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“…Moschovidis et al proposed this Disposal Domain Concept in 1993. 21 If the formation has little compressive strength (soft, unconsolidated formations typical of the Gulf of Mexico and shallow formations on the North Slope of Alaska) then another phenomenon might take place as well. Here, in addition to multiple fractures being created, each injection could provide enough shear stress to overcome the minimal grain-to-grain cementing.…”

Section: Multiple Fractures and Disaggregation Conceptsmentioning

confidence: 99%

Drill Cuttings Injection: A Review of Major Operations and Technical Issues

Keck¹

2002

SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractSince its first use about 15 years ago, drill cuttings injection has grown to become a routine operation performed around the world. This rapid development is due to increasingly stringent environmental regulations and improved costs compared to alternative disposal options. The regulations for overboard discharge of cuttings started with limitations on oilbased muds and has now expanded to include synthetic muds as well. The economics of injection operations have improved as the industry has gained experience with the technology, with added benefits from the economies of scale offered by large capacity injection facilities.The two critical engineering questions that must be answered for injection applications are: (1) where does the waste go and (2) how much can we safely inject into a well? These questions require integration of a variety of environmental, technical and economic factors that are important for each particular injection operation. The geometry of hydraulic fractures created during solids injection is one of the key issues in most operations. This coupling between solids injection and fracturing is the focus of this paper.

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Section: Multiple Fractures and Disaggregation Conceptsmentioning

confidence: 99%

Drill Cuttings Injection: A Review of Major Operations and Technical Issues

Keck¹

2002

SPE Annual Technical Conference and Exhibition

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“…Assume that there are not proppants in sheared fractures, so the permeability can be calculated as follows [34,35].…”

Section: Permeability Of Sheared Fracturesmentioning

confidence: 99%

Study of Cyclic Fracturing in Vertical CBM Wells

Li¹,

Wan²

2017

TOPEJ

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Background:Coal-bed methane productivity of single well is very low, and has been the bottleneck of the coal-bed methane industry in China. Objective:Although hydraulic fracturing is the only stimulation measure to develop CBM, it cannot increase production effectively, conventional fracturing method to create opening fractures should be improved. How to make good use of natural fractures, which are plentiful in CBM reservoirs, is also an important subject for hydraulic fracturing. Method:In this paper, the plastic deformation of coal rock is analyzed by harnessing a pseudo-Maxwell creep phenomenon, which is normally present in rock. The Kelvin-Voigt model is utilized to describe pseudo-plastic behavior of coal rock to determine pressurization and decay cyclic time for cyclic fracturing design. The mechanical requirement for shearing natural fractures is also analyzed, and shearing distance between the faces of natural fracture can be calculated by Westergaard stress function. Ultimately, the cyclic fracturing method is proposed according to theories about stress alteration and shearing of natural fractures. This method includes such periods as fracturing, pumping shut-down and so on. Conclusion:A complex fracture system can be created, which consists of opened and sheared fractures, then, large SRV(stimulated reservoir volume)and flowing drainage area can be acquired. In comparison with conventional fracturing method, this new way can make full use of the characteristics of CBM reservoirs and is more suitable to CBM. This method will lead to a significant increase of CBM production, and will achieve huge economic benefits.

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“…Other parameter: Slurry and solid properties are presented in Table 3, which are selected from past CRI operation in literature 5) . And injection depth is under about 100ft of the RUS layer (critical case) and the center of the UER/SIM layer (Figure 3).…”

Section: Simulation Studymentioning

confidence: 99%

Cuttings reinjection to shallow undersea formation: The Geomechanical acceptance analysis using hydraulic fracturing simulator

Shioya¹,

Yamamoto²,

Fujieda

et al. 2002

Abu Dhabi International Petroleum Exhibition and Conference

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractOperation availability, environmental safety, and storage capacity of the slurrified cuttings re-injection into a shallow, permeable formation off-shore Abu Dhabi was evaluated using a computer simulator for hydraulic fracturing.For the study, Umm Er Radhuma formation of Z field is chosen as the disposal formation, meanwhile Rus formation is regarded as the cap rock over the formation for isolating injected fluid and solid from propagating to seabed. A Geomechanical model of the formations which includes stress regime, formation pressure, rock mass properties, and leak-off characteristic was established with available data from literatures, wire line logging, and water disposal history in the same formation.The numerical model, which is developed by the authors , provides the estimation of injection pressure, fracture geometry and size, and storage volume of the slurry with a modeled injection schedules. The effect of solid particle concentration which may reduce pressure near fracture tip and cause screen off is taken into account for the fluid flow analysis and the determinatin of the fractrue geometry.

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Disposal of Oily Cuttings by Downhole Periodic Fracturing Injections, Valhall, North Sea: Case Study and Modeling Concepts

Cited by 41 publications

References 2 publications

Drill Cuttings Injection: A Review of Major Operations and Technical Issues

Drill Cuttings Injection: A Review of Major Operations and Technical Issues

Study of Cyclic Fracturing in Vertical CBM Wells

Cuttings reinjection to shallow undersea formation: The Geomechanical acceptance analysis using hydraulic fracturing simulator

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