Method for predicting and evaluating low permeability oil reservoir water-injection induced cracks
A technology of prediction method and evaluation method, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., and can solve the problems of not providing prediction and evaluation methods for water injection-induced fractures in low-permeability reservoirs
Active Publication Date: 2016-09-21
CHINA UNIV OF PETROLEUM (BEIJING)
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Using the above technical scheme, the complex natural fracture network system with multiple phases and multiple genetic types is divided into natural fracture subsystems of single phase and single genetic type through phase stripping and genetic type determination as the basic research object, improving the The prediction accuracy of natural fractures in oil and gas reservoirs, but this patent only publishes the prediction and evaluation method of natural fractures by stage and division, and does not provide the prediction and evaluation method of water injection-induced fractures in low permeability reservoirs
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[0048] In order to better understand the technical solutions and advantages of the present invention, the present invention will be further described below through specific embodiments.
[0049] Step 1: Identification of single well induced fractures. The formation of water injection-induced fractures is a dynamic process, which can be identified and characterized by data such as production performance of injection and production wells, monitoring of liquid production profile and water absorption profile, well testing, tracer monitoring, and water flooding front monitoring. For example, if figure 1 As shown, it is the fitting diagram of oilfield well test data. On the well test interpretation curve, it shows a typical dual-medium type. Such as figure 2 As shown, from the monitoring results of the water absorption profile of the water injection well at different times, it has shown obvious and gradually enhanced peak-shaped water absorption characteristics, indicating that t...
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The invention discloses a method for predicting and evaluating low permeability oil reservoir water-injection induced cracks. The method comprises following steps: identifying individual well induced cracks; determining the formation mechanism and main controlling factors of the water-injection induced cracks; predicting water-injection induced cracks according to the identification of the individual well induced cracks and determination of the formation mechanism and main controlling factors of the water-injection induced cracks; finally, evaluating according to the prediction results. By means of the evaluation of the influence of water-injection induced cracks on low permeability oil reservoir fluid flowing field and water injection development, the three-dimensional space distribution rules of the water-injection induced cracks formed during the development process of the low permeability oil reservoir can be predicted, and the influence of the water-injection induced cracks on low permeability oil reservoir development can be evaluated; reliable information is provided for low permeability oil reservoir development and therefore the risk cost of low permeability oil reservoir development is reduced; the low permeability oil reservoir water injection development is improved and recovery efficiency is increased.
Description
technical field [0001] The invention belongs to the technical fields of oil and gas field development geology and reservoir engineering, and in particular relates to a method for predicting and evaluating fractures induced by water injection in low-permeability reservoirs. Background technique [0002] Low-permeability oil and gas reservoirs are an important type of oil and gas reservoirs in my country's continental sedimentary basins. They are widely distributed and have huge oil and gas resources. They are the main battlefield for increasing onshore oil and gas reserves and production in my country and the mainstream of future oil and gas development. my country's low-permeability reservoirs are mainly developed by water injection. Many years of water injection development practice have shown that due to the poor permeability of the reservoir matrix in low-permeability reservoirs, the injected water is not easy to diffuse at the bottom of the well, resulting in a rapid rise...
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IPC IPC(8): E21B43/26E21B43/20E21B49/00
CPCE21B43/20E21B43/26E21B49/00
Inventor 曾联波赵向原
Owner CHINA UNIV OF PETROLEUM (BEIJING)