Intrastratal heterogeneous well pattern model capable of realizing quality classification injection and production

Abstract

The invention relates to an intrastratal heterogeneous well pattern model capable of realizing quality classification injection and production. The main objective of the invention is to provide an intrastratal heterogeneous well pattern model for a laboratory experiment, and the intrastratal heterogeneous well pattern model can simulate polymer flooding quality classification injection and production. The intrastratal heterogeneous well pattern model is characterized in that: after the injection end and the production end of a heterogeneous bare composite core are drilled out, matched cylindrical sealing rubber rings are put in; bakelite tubes are embedded into the rings; the bakelite tube is provided with liquid inlet holes, and the side face of the bakelite tube is provided with liquid outlet holes, the liquid outlet holes are respectively corresponding to the middle positions of a low permeable layer, a middle permeable layer, a high permeable layer and an extra-high permeable layer of the heterogeneous bare composite core from up to down; flow passages between the liquid inlet holes and the liquid outlet holes are direct to the heterogeneous bare composite core; the injection end and the production end of the heterogeneous bare composite core are respectively provided with a square stainless steel closed container, and the container is provided with liquid baffle plates which can divide the inner part of the container into a plurality of single isolation areas; a sharp-nose bolt and a sealing rubber sheet are fixed within the container, and the sharp-nose bolt and the sealing rubber sheet can control the flow of the liquid in the container; discharge holes on the bottom of the container are communicated with the liquid inlet holes of the bakelite tube.

Description

technical field [0001] The invention relates to an intralayer heterogeneous well pattern model applied in a laboratory. Background technique [0002] At present, polymer flooding has been applied on a large scale in various oilfields. With the demand of crude oil production, polymer flooding targets have begun to target the second or third types of reservoirs with low permeability and poor reservoir physical properties. In this case, if the general injection technique is adopted, the actual injected amount of polymer in the low-permeability layer will be less, and the production degree will be lower. In addition, general injection often leads to excessive pressure increase, approaching or exceeding the fracture pressure, which leads to the restriction of its injection parameters and affects the injection effect. Development practice shows that too many layers in a layer and poor heterogeneity between layers result in very unbalanced displacement and production. In the case...

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Problems solved by technology

In view of the unrepeatability of oilfield development and consideration of the protection of reservoirs, all current field tests need to conduct targeted indoor experiments first. However, the limitations of the interlayer heterogeneity core model are used for research. At this stage, it is still impossible to solve the technical problem of injecting and producing the core model under the condition of intralayer heterogeneity, especially in the During the process, it is a key problem to separate the displacement fluid and block the channeling of the displacement fluid before it enters the core, so it is impossible to explore important data such as the oil displacement effect and seepage law under the heterogeneous conditions in the layer.

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