Using electromagnetic waves to remove near wellbore damages in a hydrocarbon reservoir
AssigneeSaudi Arabian Oil Company
InventorsFeng Liang, Jinhong Chen, Rajesh Kumar Saini, Hui Hai Liu
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Abstract
The present disclosure describes methods and systems for removing near wellbore damage in a hydrocarbon reservoir. One method includes position an antenna inside a wellbore in a location corresponding to a formation where near wellbore damage occurs; wherein the wellbore extends from a surface of a hydrocarbon reservoir downward into the subterranean structure of the hydrocarbon reservoir; transmitting an electromagnetic (EM) wave to the antenna; and irradiating, from the antenna, at least a portion of the EM wave at the formation, wherein the portion of the EM wave removes the near wellbore damage at the formation.
Claims11
A method, comprising:
- positioning an antenna inside a wellbore in a location corresponding to a formation comprising near-wellbore damage, wherein the wellbore extends from a surface of a hydrocarbon reservoir into the hydrocarbon reservoir;
- determining an irradiation power level of an electromagnetic (EM) wave based on at least a volume of a treatment zone, a density of the formation in the treatment zone, a target temperature change, and a treatment duration;
- determining an energy density converted from the EM wave based on the following equation:
- w=σE2+ωϵ″E2
- where w represents the energy density converted from the EM wave, E represents a strength of an electric field of the EM wave, ω is a frequency of the EM wave, ϵ″ represents a dielectric loss of the formation in the treatment zone, and σ represents a conductivity of the formation in the treatment zone;
- determining a penetration depth of the treatment zone by the EM wave based on the following equation:
- D
- =
- 1
- ω
-
- μ
- 0
-
- ɛ
- ′
- 2
-
- [
- 1
- +
- (
- ωɛ
- ″
- +
- σ
- ωɛ
- ′
- )
- 2
- -
- 1
- ]
- where D represents the penetration depth, μ0=4 π×10−7 H/m, ϵ represents a dielectric constant of the formation in the treatment zone;
- transmitting the EM wave to the antenna;
- irradiating, from the antenna, a portion of the EM wave with the determined irradiation power level, the determined energy density, and the determined penetration depth, at the formation;
- and
- removing the near-wellbore damage at the formation with the portion of the EM wave.
Dependencies are inferred from the claim text.