Method and device for identifying water-injection induced fracture in oil reservoir
An identification method and reservoir technology, applied in the field of identification of fractures induced by water injection in oil reservoirs, can solve the problems of natural fracture opening and poor development effect of tight and low permeability reservoirs, and achieve the goal of reducing risk costs and improving oil recovery. Effect
Active Publication Date: 2019-07-05
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
When the water injection pressure exceeds the fracture opening pressure or formation fracture pressure, it is easy to cause natural fractures to open, forming the main channel for water flooding and water channeling, and making the development effect of tight low permeability reservoirs worse
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[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0025] figure 1 It is a schematic flowchart of a method for identifying fractures induced by reservoir water injection according to an embodiment of the present invention. Such as figure 1 As shown, the method for identifying reservoir water injection-induced fractures in some embodiments may include:
[0026] Step S110: determining the critical value of at least one control factor;
[0027] Step S120: The value of the control factor is greater than the critical value of the control factor and the value of the control factor is smaller than the critical value of th...
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The invention provides a method and device for identifying a water-injection induced fracture in an oil reservoir. The method comprises the steps: critical values of one or more control factors are determined; the situation that values of the control factors are larger than the critical values of the control factors and the situation that the values of the control factors are smaller than the critical values of the control factors serve as forming conditions of the water-injection induced fracture, and the center at the moment when the water-injection induced fracture is not formed and the center at the moment when the water-injection induced fracture is formed are determined; and according to the values of the one or more control factors, the critical values of the one or more control factors, the center at the moment when the water-injection induced fracture is not formed, and the center at the moment when the water-injection induced fracture is formed of a to-be-distinguished well,whether the to-be-distinguished well forms the water-injection induced fracture or not is judged. Through the method and the device, the water-injection induced fracture during development of the compact low-permeability oil reservoir can be identified, thus the development risk cost of the compact low-permeability oil reservoir is lowered, and the recovery ratio is increased.
Description
technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method and device for identifying fractures induced by water injection in oil reservoirs. Background technique [0002] Tight low-permeability oil and gas reservoirs are an important type of oil and gas reservoirs in continental sedimentary basins. They are widely distributed and have huge oil and gas resources. They are the main battlefield for onshore oil and gas reserves and production and the mainstream of future oil and gas development. Tight and 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 tight and low-permeability reservoirs, the injected water is not easy to diffuse at the bottom of the well, resulting in a rapid rise in water injection pressure. When the water injection pressure exceeds the fracture opening ...
Claims
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IPC IPC(8): E21B43/26E21B47/10
CPCE21B43/26E21B47/10
Inventor 曾联波董少群赵向原吕文雅
Owner CHINA UNIV OF PETROLEUM (BEIJING)