A Prediction Method for the Development Layer and Direction of Dominant Seepage Channels
A technology of superior seepage channels and prediction methods, applied in the field of prediction of development layers and directions of dominant seepage channels, can solve problems such as intensified conflicts between layers, waste of water shutoff agents, and increased production costs, so as to prolong the development life and increase production costs. Good yield and accuracy
Active Publication Date: 2022-03-18
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
The existence of dominant seepage channels will intensify the contradictions within and between layers, resulting in lower oil recovery, higher production costs, and lower economic benefits
At the same time, if inaccurate identification of the development layers of dominant seepage channels and poor prediction will directly affect the effect of profile control and water shutoff in the later stage, it will not only cause waste of water shutoff agent, but may even block other high-quality reservoir sections. to have the opposite effect
Method used
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Embodiment
[0089] The prediction results of the development layers of dominant seepage channels by this method are shown in Table 4:
[0090] Table 4 Statistical table of the actual development horizon of the latest dominant seepage channel in a certain research area
[0091]
[0092]
[0093] It can be seen from Table 4 that the prediction results of the dominant seepage channel prediction model are basically consistent with the identification results of the latest field drilling test data in the oilfield, and the calculation results of the prediction model are all above 1. At the same time, for some typical layers with dominant seepage channels on site, the model prediction values often show high values (such as the L102 layer in the injection-production direction of B36ST1-B21ST1).
[0094] Taking the B36ST1 well group as an example, the latest injection-production curve of this well group is as follows: figure 1 shown. It can be seen from the B36ST1 injection-production c...
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The invention discloses a method for predicting the development layer and direction of dominant seepage channels, comprising: comprehensively analyzing geological and production dynamic data, obtaining geological static analysis coefficients and production dynamic analysis coefficients of different intervals between wells; The connectivity coefficient of intervals; obtain the parameters of single-layer multi-sand bodies in different intervals between wells according to the logging interpretation results; obtain the permeability of water injection wells under different water injection multiples; establish water injection wells and oil production wells with original dominant channels The inter-plane homogeneity coefficient and the assignment table of inter-well plane homogeneity coefficient of water injection wells and oil production wells with developed secondary dominant channels are used to calculate the plane homogeneity coefficient of different intervals between wells; finally, the types of different intervals between wells are judged. The prediction result of the invention has good accuracy, and can provide certain reference significance for production measures such as follow-up treatment in the research area.
Description
technical field [0001] The invention relates to a method for predicting development layers and directions of dominant seepage channels, and belongs to the technical field of oil reservoir exploration and development. Background technique [0002] Water injection development is the most common development method for sandstone oilfields. Since the reservoir is scoured by water injection for a long time during the development process, the pore structure of the reservoir will change greatly, and the cementation will be gradually weakened. The difference in permeability and the difference in viscosity of oil and water lead to long-term channeling of injected water along the dominant channels with high permeability and high water content, which enlarges the radius and permeability of the original pore throats, and inefficient or ineffective circulation of injected water, forming large pores. That is, the water flow advantage seepage channel. The existence of dominant seepage chan...
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IPC IPC(8): E21B49/00G06F30/20G06F17/10
CPCE21B49/00G06F30/20G06F17/10
Inventor 唐洪张航宇李鹏飞李振
Owner SOUTHWEST PETROLEUM UNIV