Method and device for determining injection capacity in water-gas alternate injection process
A technology of injection capacity and water-air alternation, which is applied in the fields of instruments, technology management, data processing and application, etc., and can solve problems such as inability to quantify injection capacity
Pending Publication Date: 2019-11-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
However, due to the complexity of the oil-gas-water three-phase seepage mechanism, the existing technology is still unable to quantify the injection capacity in the process of water-gas alternating injection from the microscopic level.
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Embodiment
[0068] The embodiment of the present invention provides a method for determining the injection capacity during the water-gas alternating injection process, referring to figure 1 As shown, within each preset interval within the preset time, the following steps are performed:
[0069] Step S11: Select the equivalent length of the fluid in the capillary according to the geometric shape of the capillary and the start time of the current interval, and determine whether each fluid is in the roar of the capillary.
[0070] Specifically, in order to simplify the calculation, refer to figure 2 As shown, the geometric shape of the capillary can be preset as follows: the capillary has a roar, the capillary is distributed with equal diameters except the roar, and the radius of the capillary is R p ; The roar of the capillary is distributed symmetrically, and the radius of the roar changes uniformly. The radius of the center of the roar is R t , the radius at any point of the roar is R(...
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The invention discloses a method and a device for determining injection capacity in a water-gas alternate injection process. The method comprises the following steps: in each preset interval, determining whether each fluid is in a throat or not according to the geometrical shape of a capillary tube and the equivalent length of the currently selected fluid, and further determining the injection amount of carbon dioxide or water in the current interval according to the geometrical shape of the capillary tube, the pressure difference between the two ends of the capillary tube and the value of a preset parameter; determining the ratio of the injection amount to the pressure difference as the injection capacity of the capillary tube in the current interval; meanwhile, determining the carbon dioxide flow rate according to the injection amount, and then determining the miscible zone equivalent length and the carbon dioxide equivalent length according to the relation between the miscible zoneequivalent length and the carbon dioxide flow time and flow rate and used for judging whether the fluid is in the throat or not at the next interval starting time. The injection capacity in the water-gas alternate injection process can be quantified from the microcosmic scale. A theoretical basis is provided for research on the change rule and influence factors of the oil reservoir injection capacity.
Description
technical field [0001] The invention relates to the technical field of oil reservoir development, in particular to a method and device for determining injection capacity during water-gas alternating injection. Background technique [0002] Water-gas alternating flooding in the process of reservoir development combines the advantages of carbon dioxide flooding and water flooding, which can greatly increase recovery and has broad application prospects. Especially in the middle and late stages of oilfield development, water-gas alternating flooding can not only block dominant seepage channels, but also optimize water injection, restore formation energy, and increase oil recovery. However, in the field application, it was also found that the injection capacity would be reduced during the water-air alternating injection process, which affected the development effect of the water-air alternating injection to varying degrees. [0003] In recent years, there is a lack of sufficient...
Claims
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IPC IPC(8): G06Q50/06
CPCG06Q50/06Y02P90/84
Inventor 王文东孟凡坤苏玉亮王程伟郝永卯李新雨陈子强
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)