Waterflooding analysis in a subterranean formation
AssigneeSchlumberger Technology Corporation
InventorJonathan Elphick
Life of this patent
Estimating the term…
Abstract
A method of analyzing a subterranean formation. The method includes specifying a volume of interest in the subterranean formation, specifying an injector wellsite that penetrates the volume of interest, specifying a first producer wellsite and a second producer wellsite, each of which penetrates the volume of interest, calculating a first Injectivity-Productivity Index (IPI) for a first injector-producer wellsite pair which includes the injector wellsite and the first producer wellsite, calculating a second IPI for a second injector-producer wellsite pair which includes the injector wellsite and the second producer wellsite, determining whether the first IPI is substantially equal to the second IPI to obtain an analysis result, and adjusting a wellsite operation based on the analysis result.
Claims20
A method of analyzing a subterranean formation, comprising:
- specifying a volume of interest in the subterranean formation;
- specifying an injector wellsite, which penetrates the volume of interest;
- specifying a first producer wellsite and a second producer wellsite, each of which penetrates the volume of interest;
- calculating, using a processor of a computer system, a first Injectivity-Productivity Index (IPI) for a first injector-producer wellsite pair which includes the injector wellsite and the first producer wellsite, wherein the first IPI is calculated based on a total flowrate of injected fluid between the injector wellsite and the first producer wellsite, a first bottom hole pressure of the injector wellsite, and a second bottom hole pressure of the first producer wellsite;
- calculating, using the processor, a second IPI for a second injector-producer wellsite pair which includes the injector wellsite and the second producer wellsite, wherein the second IPI is calculated based on the total flowrate of injected fluid between the injector wellsite and the first producer wellsite, the first bottom hole pressure of the injector wellsite, and a third bottom hole pressure of the second producer wellsite;
- determining, using the processor, whether the first IPI is substantially equal to the second IPI to obtain an analysis result;
- and
- adjusting a wellsite operation based on the analysis result.
A method of analyzing a subterranean formation, comprising:
- specifying a volume of interest in the subterranean formation;
- specifying an injector wellsite, which penetrates the volume of interest;
- specifying a first producer wellsite and a second producer wellsite, which penetrates the volume of interest;
- calculating, using a processor of a computer system and based on a pre-determined criterion, a first portion of a total flowrate from the injector wellsite for a first injector-producer wellsite pair which includes the injector wellsite and the first producer wellsite;
- calculating, using the processor and based on the pre-determined criterion, a second portion of the total flowrate from the injector wellsite for a second injector-producer wellsite pair which includes the injector wellsite and the second producer wellsite;
- calculating, using the processor, a first Injectivity-Productivity Index (IPI) for the first injector-producer wellsite pair and a second IPI for the second injector-producer wellsite pair using at least the first total flowrate and the second total flowrate, respectively;
- determining, using the processor, whether the difference between the first IPI and the second IPI exceeds a threshold value;
- and
- adjusting a downhole pressure when the difference between the first IPI and the second IPI exceeds the threshold value.
A surface unit for analyzing a subterranean formation, comprising:
- a repository for storing data obtained from the subterranean formation and data of a first producer wellsite, a second producer wellsite, a first injector wellsite, and a second injector wellsite;
- and
- memory having stored instructions when executed by a processor comprising functionalities to:
- specify a volume of interest in the subterranean formation;
- specify the first producer wellsite penetrating the volume of interest, wherein specifying the first producer wellsite is based on at least a first portion of the data;
- specify the first injector wellsite and the second injector wellsite, each of which penetrating the volume of interest, wherein specifying the first injector wellsite and the second injector wellsite is based on at least a second portion of the data;
- calculate, based on a pre-determined criterion, a first portion of a total flowrate from the injector wellsite for a first injector-producer wellsite pair which includes the injector wellsite and the first producer wellsite;
- calculate, based on the pre-determined criterion, a second portion of the total flowrate from the injector wellsite for a second injector-producer wellsite pair which includes the injector wellsite and the second producer wellsite;
- calculate a first Injectivity-Productivity Index (IPI) for the first injector-producer wellsite pair and a second IPI for the second injector-producer wellsite pair using at least the first total flowrate and the second total flowrate, respectively;
- determine whether the first IPI is substantially equal to the second IPI to obtain a first analysis result;
- and
- perform a first wellsite operation based on the first analysis result.
Dependencies are inferred from the claim text.