Imbibition processes in fractured chalk core plugs with connate water mobilization

C.M. Nielsen; D. Olsen; N. Bech

doi:10.2118/63226-MS

Imbibition processes in fractured chalk core plugs with connate water mobilization

Department of Geo-energy and Storage

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › peer-review

5 Citations (Scopus)

Abstract

A displacement process in a chalk core plug with an induced axial fracture uses the fluid system H₂O-D₂O-n-decane. Initially the plug contains a mixture of D₂O and n-decane with oil saturation equal to 88 %. The plug is flooded with H₂O. The displacement process is monitored by NMR with a chemical shift technique enabling spatial resolution of the H₂O and oil signals. The D₂O component is not directly detected, but is calculated from the difference between the actual signal intensities and the signal intensities in a situation where the pore space is completely saturated with H₂O and oil.

H₂O-D₂O-oil constitutes a partly miscible fluid system which is an analogy to the injection water-formation water-oil system of a hydrocarbon reservoir under waterflooding.

The injected H₂O traverses the sample as a well-defined front together with capillary uptake from the fracture plane. Ahead of the H₂O front the D₂O of the sample is mobilized and travels as a bank in front of the H₂O. Though the initial concentration of D₂O is only 12 % the D₂O concentration reaches 50 % at the bank.

The experiment was simulated by means of ECLIPSE with a fair match of the displacement process.

The injected H₂O has only made limited contact with the produced oil of the sample. In case of chemical EOR processes connected to waterflooding of hydrocarbon reservoirs a similar displacement situation could seriously affect the efficiency of the EOR process

Original language	English
Title of host publication	SPE Annual Technical Conference and Exhibition, 1-4 October, Dallas, Texas
Publisher	Society of Petroleum Engineers
Pages	709-718
Number of pages	10
Edition	B
ISBN (Print)	978-1-55563-910-5
DOIs	https://doi.org/10.2118/63226-MS
Publication status	Published - 2000
Event	SPE Annual Technical Conference and Exhibition 2000 - Dallas, Texas, U.S.A. Duration: 1 Oct 2000 → 4 Oct 2000

Conference

Conference	SPE Annual Technical Conference and Exhibition 2000
City	Dallas, Texas, U.S.A.
Period	1/10/00 → 4/10/00

Programme Area

Programme Area 3: Energy Resources

Access to Document

10.2118/63226-MS

Cite this

@inproceedings{86f73cf3f97e4cac90a0e01d8f4325ed,

title = "Imbibition processes in fractured chalk core plugs with connate water mobilization",

abstract = "A displacement process in a chalk core plug with an induced axial fracture uses the fluid system H2O-D2O-n-decane. Initially the plug contains a mixture of D2O and n-decane with oil saturation equal to 88 \%. The plug is flooded with H2O. The displacement process is monitored by NMR with a chemical shift technique enabling spatial resolution of the H2O and oil signals. The D2O component is not directly detected, but is calculated from the difference between the actual signal intensities and the signal intensities in a situation where the pore space is completely saturated with H2O and oil. H2O-D2O-oil constitutes a partly miscible fluid system which is an analogy to the injection water-formation water-oil system of a hydrocarbon reservoir under waterflooding. The injected H2O traverses the sample as a well-defined front together with capillary uptake from the fracture plane. Ahead of the H2O front the D2O of the sample is mobilized and travels as a bank in front of the H2O. Though the initial concentration of D2O is only 12 \% the D2O concentration reaches 50 \% at the bank. The experiment was simulated by means of ECLIPSE with a fair match of the displacement process. The injected H2O has only made limited contact with the produced oil of the sample. In case of chemical EOR processes connected to waterflooding of hydrocarbon reservoirs a similar displacement situation could seriously affect the efficiency of the EOR process",

author = "C.M. Nielsen and D. Olsen and N. Bech",

year = "2000",

doi = "10.2118/63226-MS",

language = "English",

isbn = "978-1-55563-910-5 ",

pages = "709--718",

booktitle = "SPE Annual Technical Conference and Exhibition, 1-4 October, Dallas, Texas",

publisher = "Society of Petroleum Engineers",

edition = "B",

note = "SPE Annual Technical Conference and Exhibition 2000 ; Conference date: 01-10-2000 Through 04-10-2000",

}

Nielsen, CM , Olsen, D & Bech, N 2000, Imbibition processes in fractured chalk core plugs with connate water mobilization. in SPE Annual Technical Conference and Exhibition, 1-4 October, Dallas, Texas. B edn, Society of Petroleum Engineers, pp. 709-718, SPE Annual Technical Conference and Exhibition 2000, Dallas, Texas, U.S.A., 1/10/00. https://doi.org/10.2118/63226-MS

TY - GEN

T1 - Imbibition processes in fractured chalk core plugs with connate water mobilization

AU - Nielsen, C.M.

AU - Olsen, D.

AU - Bech, N.

PY - 2000

Y1 - 2000

N2 - A displacement process in a chalk core plug with an induced axial fracture uses the fluid system H2O-D2O-n-decane. Initially the plug contains a mixture of D2O and n-decane with oil saturation equal to 88 %. The plug is flooded with H2O. The displacement process is monitored by NMR with a chemical shift technique enabling spatial resolution of the H2O and oil signals. The D2O component is not directly detected, but is calculated from the difference between the actual signal intensities and the signal intensities in a situation where the pore space is completely saturated with H2O and oil. H2O-D2O-oil constitutes a partly miscible fluid system which is an analogy to the injection water-formation water-oil system of a hydrocarbon reservoir under waterflooding. The injected H2O traverses the sample as a well-defined front together with capillary uptake from the fracture plane. Ahead of the H2O front the D2O of the sample is mobilized and travels as a bank in front of the H2O. Though the initial concentration of D2O is only 12 % the D2O concentration reaches 50 % at the bank. The experiment was simulated by means of ECLIPSE with a fair match of the displacement process. The injected H2O has only made limited contact with the produced oil of the sample. In case of chemical EOR processes connected to waterflooding of hydrocarbon reservoirs a similar displacement situation could seriously affect the efficiency of the EOR process

AB - A displacement process in a chalk core plug with an induced axial fracture uses the fluid system H2O-D2O-n-decane. Initially the plug contains a mixture of D2O and n-decane with oil saturation equal to 88 %. The plug is flooded with H2O. The displacement process is monitored by NMR with a chemical shift technique enabling spatial resolution of the H2O and oil signals. The D2O component is not directly detected, but is calculated from the difference between the actual signal intensities and the signal intensities in a situation where the pore space is completely saturated with H2O and oil. H2O-D2O-oil constitutes a partly miscible fluid system which is an analogy to the injection water-formation water-oil system of a hydrocarbon reservoir under waterflooding. The injected H2O traverses the sample as a well-defined front together with capillary uptake from the fracture plane. Ahead of the H2O front the D2O of the sample is mobilized and travels as a bank in front of the H2O. Though the initial concentration of D2O is only 12 % the D2O concentration reaches 50 % at the bank. The experiment was simulated by means of ECLIPSE with a fair match of the displacement process. The injected H2O has only made limited contact with the produced oil of the sample. In case of chemical EOR processes connected to waterflooding of hydrocarbon reservoirs a similar displacement situation could seriously affect the efficiency of the EOR process

UR - https://www.scopus.com/pages/publications/0034589716

U2 - 10.2118/63226-MS

DO - 10.2118/63226-MS

M3 - Conference article in proceedings

SN - 978-1-55563-910-5

SP - 709

EP - 718

BT - SPE Annual Technical Conference and Exhibition, 1-4 October, Dallas, Texas

PB - Society of Petroleum Engineers

T2 - SPE Annual Technical Conference and Exhibition 2000

Y2 - 1 October 2000 through 4 October 2000

ER -

Imbibition processes in fractured chalk core plugs with connate water mobilization

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