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Carbonate rock reservoir karst cave-fracture reservoir body water injection indication curve interpretation model

A carbonate rock reservoir and indicator curve technology, which is applied in the fields of fluid production, wellbore/well components, and earth-moving drilling, etc. It can solve the problems of unexplainable oil and water volume in karst caves and failure to consider fractured reservoirs.

Active Publication Date: 2017-05-17
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0002] At present, the traditional model is that the oil well directly drills into the karst cave, and does not consider the influence of the fracture reservoir. However, in field practice, the reservoir unit composed of fractures and karst caves is more common. When the proportion of the fluid stored in the fracture is When it is higher, it is necessary to consider the influence of fractured reservoirs. Therefore, it is necessary to consider the pressure changes of fractured and dissolved cave reservoirs after water injection to establish a model for the water injection indicator curve of carbonate reservoirs dissolved caves and fractured reservoirs for analysis.
However, the traditional model is difficult to distinguish the influence of different compressibility coefficients of caves and fractured reservoirs on the slope of the water injection indicator curve, and it is impossible to explain the proportion of caves and fractured reservoirs and calculate the oil-water volume of various types of reservoirs through the existing model

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  • Carbonate rock reservoir karst cave-fracture reservoir body water injection indication curve interpretation model
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[0077] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following technical solutions in the present invention are clearly and completely described. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0078] The derivation of the model still assumes that the entire reservoir system reaches stability instantaneously and rapidly after water injection. Divide the entire closed carbonate rock reservoir controlled by a single well into two parts: fractures and karst caves. The ratio of the fractures to the total volume is assumed to be a, and considering the elastic energy of fluid water and reservoir rocks, the compressibility coefficient C respectively o and C ...

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Abstract

The invention provides a carbonate rock reservoir karst cave-fracture reservoir body water injection indication curve interpretation model. As for different compression coefficients of different reservoir medium karst caves and fractures, the model is used for distinguishing the influences on the water injection indication curve pattern from the elastic energy provided by the karst caves and the fractures, and considering the influences on the water injection indication curve pattern from oil-water two-phase elastic energy. The novel model can be used for distinguishing the different elastic compression coefficients of the karst caves and the fractures and calculating the respective proportions of the karst caves and the fracture reservoir body, thereby calculating the respective corresponding volumes.

Description

technical field [0001] The invention relates to the field of oil reservoir geology and development technology, in particular to a water injection indication curve interpretation model of a carbonate rock oil reservoir karst cave-fracture reservoir body. Background technique [0002] At present, the traditional model is that the oil well directly drills into the karst cave, and does not consider the influence of the fracture reservoir. However, in field practice, the reservoir unit composed of fractures and karst caves is more common. When the proportion of the fluid stored in the fracture is When it is higher, it is necessary to consider the influence of fractured reservoirs. Therefore, it is necessary to consider the pressure changes of fractured and dissolved cave reservoirs after water injection to establish a model for the water injection indicator curve of carbonate reservoirs dissolved caves and fractured reservoirs for analysis. . However, the traditional model is di...

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Application Information

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IPC IPC(8): E21B43/20E21B49/00
Inventor 乐平唐潮杜志敏郭忠良陈小凡刘东晨李壮汤连东谢志伟
Owner SOUTHWEST PETROLEUM UNIV
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