Numerical modeling of laser perforating process
AssigneeSaudi Arabian Oil Company
InventorYanhui Han
Life of this patent
Estimating the term…
Abstract
In a general implementation, data regarding a rock sample from a drilling site is received. A thermal-mechanical interaction model is generated based on the rock sample date. The thermal-mechanical interaction model is used to determine a penetration rate and mechanical damage around perforation channels through the modeling of heat that is emitted on an exposed surface of the rock sample by a laser beam emitted from a laser beam source. The determined penetration rate and mechanical damage is used to evaluate an effectiveness of the laser beam source to be used in a perforation at the drilling site.
Claims17
A computer-implemented method executed by one or more processors, the method comprising:
- receiving rock sample data regarding a rock sample from a drilling site;
- generating a thermal-mechanical interaction model based on the rock sample data, wherein the thermal-mechanical interaction model simulates heat transfer in the rock sample, wherein thermal energy propagates in a form of thermal conduction that is described in the thermal-mechanical interaction model according to a transient thermal conduction equation, and wherein the transient thermal conduction equation is described according to:
- ρ
-
-
- C
- V
-
- ∂
- T
- ∂
- t
- =
- ∇
- (
- k
-
-
- ∇
- T
- )
- +
- q
- V
- ,
- wherein:
- ρ [kg/m3] is the density of the rock sample;
- Cv [J/(kg C)] is the specific heat of a constant volume of the rock sample;
- t[s] is time;
- T is the temperature [° C.];
- k[W/(m ° C.)] is a thermal conductivity of the rock sample;
- and qV [W/m3] is a volumetric heat-source intensity;
- determining, from the thermal-mechanical interaction model, a penetration rate and mechanical damage around perforation channels through modeling of heat emitted on an exposed surface of the rock sample by a laser beam emitted from a laser beam source;
- and
- evaluating an effectiveness of the laser beam source to be used in a perforation at the drilling site based on the determined penetration rate and mechanical damage.
One or more non-transitory computer-readable storage media coupled to one or more processors and having instructions stored thereon which, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
- receiving rock sample data regarding a rock sample from a drilling site;
- generating a thermal-mechanical interaction model based on the rock sample data, wherein the thermal-mechanical interaction model simulates heat transfer in the rock sample, wherein thermal energy propagates in a form of thermal conduction that is described in the thermal-mechanical interaction model according to a transient thermal conduction equation, and wherein the transient thermal conduction equation is described according to:
- ρ
-
-
- C
- V
-
- ∂
- T
- ∂
- t
- =
- ∇
- (
- k
-
- ∇
- T
- )
- +
- q
- V
- ,
- wherein:
- ρ [kg/m3] is the density of the rock sample;
- Cv [J/(kg C)] is the specific heat of a constant volume of the rock sample;
- t[s] is time;
- T is the temperature [° C.];
- k[W/(m ° C.)] is a thermal conductivity of the rock sample;
- and qV [W/m3] is a volumetric heat-source intensity;
- generating a thermal-mechanical interaction model based on the rock sample data;
- determining, from the thermal-mechanical interaction model, a penetration rate and mechanical damage around perforation channels through modeling of heat emitted on an exposed surface of the rock sample by a laser beam emitted from a laser beam source;
- and
- evaluating an effectiveness of the laser beam source to be used in a perforation at the drilling site based on the determined penetration rate and mechanical damage.
A computer-implemented system, comprising:
- one or more processors;
- and
- a computer-readable storage device coupled to the one or more processors and having instructions stored thereon which, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
- receiving rock sample data regarding a rock sample from a drilling site;
- generating a thermal-mechanical interaction model based on the rock sample data, wherein the thermal-mechanical interaction model simulates heat transfer in the rock sample, wherein thermal energy propagates in a form of thermal conduction that is described in the thermal-mechanical interaction model according to a transient thermal conduction equation, and wherein the transient thermal conduction equation is described according to:
- ρ
-
-
- C
- V
-
- ∂
- T
- ∂
- t
- =
- ∇
- (
- k
-
- ∇
- T
- )
- +
- q
- V
- ,
- wherein:
- ρ [kg/m3] is the density of the rock sample;
- Cv [J/(kg C)] is the specific heat of a constant volume of the rock sample;
- t[s] is time;
- T is the temperature [° C.];
- k[W/(m ° C.)] is a thermal conductivity of the rock sample;
- and qV [W/m3] is a volumetric heat-source intensity;
- generating a thermal-mechanical interaction model based on the rock sample data;
- determining, from the thermal-mechanical interaction model, a penetration rate and mechanical damage around perforation channels through modeling of heat emitted on an exposed surface of the rock sample by a laser beam emitted from a laser beam source;
- and
- evaluating an effectiveness of the laser beam source to be used in a perforation at the drilling site based on the determined penetration rate and mechanical damage.
Dependencies are inferred from the claim text.